CN103004109B - Method, the Apparatus and system of the configurable website wavelength dependent attenuation of on-line proving - Google Patents

Abstract

The present invention is applicable to the communications field, provides the method for the configurable website wavelength dependent attenuation of a kind of on-line proving, device and optical communication system.The method comprises: the single ripple emergent light power obtaining the wavelength to be calibrated of transmitting terminal image intensifer outgoing; Wavelength break-through configuration is carried out to configurable website, makes the configurable website of the light wave break-through of wavelength to be calibrated arrive receiving terminal image intensifer, and detect the incident optical power of the light wave arriving receiving terminal image intensifer; According to single ripple emergent light power and the incident optical power of the light wave of arrival receiving terminal image intensifer of wavelength to be calibrated, obtain the wavelength dependent attenuation of wavelength to be calibrated.The method all in network implementation stage and dilatation stage can be known in real time and upgrade WDL, and then the network state that upgrades in time, ensures the communication quality of high-quality.In addition, the present invention can realize the on-line proving of wavelength dependent attenuation completely based on existing network environment, do not need to increase any hardware, effectively control the increase of cost.

Description

Method, device and system for calibrating wavelength-dependent attenuation of configurable site on line

Technical Field

The invention belongs to the field of communication, and particularly relates to a method, a device and a system for calibrating wavelength-dependent attenuation of a configurable site on line.

Background

In an optical communication network, attenuation of a wavelength division multiplexing network at a ROADM (reconfigurable optical add-drop multiplexer) site (also called a configurable site) has wavelength dependence, that is, performance of the network is wavelength dependent for each channel, and attenuation of one site at different wavelength channels can reach 3-4dB or even more. This attenuation is related to the WDL (wavelength dependent attenuation) of passive devices, usually the WDL of WSS (wavelength selective switch) dominates.

Fig. 1 shows a prior art network topology of a ROADM site, comprising a plurality of channels, each containing several passive devices 101, the optical loss of the site mainly coming from the WDL of the passive devices WSS. Referring to FIG. 2, the maximum WDL of a single WSS measured in the experiment was about 1.5-2 dB.

Further referring to fig. 3, taking a physical link l of a ROADM site as an example, the path includes two WSSs, and there are a transmitting end optical amplifier 301 and a receiving end optical amplifier 302 at the incident end and the exit end respectively to compensate for the loss of the passive device and the loss of the optical fiber, and the loss generated when the optical signal is transmitted between points a and B is the loss of the passive device. In actual operation, after the wavelength configuration of the WSS is made, usually one optical service wavelength channel is already physically opened, and in fact, in an opening or capacity expansion stage, if the actual service of the wavelength λ is not loaded (for example, the laser is not opened, and there is no optical transmission in the channel), an optical attenuation value of the wavelength λ cannot be obtained usually, so that it is difficult to eliminate the influence of the optical attenuation on the network performance.

In order to solve the above problems, various solutions have appeared in the prior art. One of them is the off-line calibration technique. That is, the WDL of each optical passive device is actually measured by a meter (e.g., spectrometer) at production, calibrated, and recorded. In theory, each wavelength channel can be accurately measured by using a meter, but in actual operation, due to the large workload, the calibration values measured by a limited number of wavelength points (for example, one wavelength in each of the long wavelength, the medium wavelength and the short wavelength) are often used for equivalently replacing WDLs of all the wavelengths, and the calibration values are not very accurate. In addition, this scheme cannot dynamically update the WDL and update the state of the network in real time. For example: after the optical passive devices at a certain station are replaced or the fiber is re-fused, if the wavelength-dependent attenuation of the newly added devices or the fused fiber point is not known, the whole station may be in an unknown state. Wherein the WDL of the fuse point is related to the fuse time and the operator's proficiency. Referring to FIG. 4, a WDL characteristic of the fuse point is shown at different fuse times, with different WDLs at different fuse times. Each fiber melting point in actual measurement may bring a loss of more than 0.2dB, and if the loss is unpredictable, the network performance is inevitably affected.

The second prior art is an online calibration technique without considering WDL. The technology does not distinguish the wavelength dependence of the channels, and adopts the signal light power attenuation value detected at the transmitting and receiving ends with opened wavelength to replace the attenuation of all the channels, which is substantially equivalent to neglecting WDLs of different channels. The scheme can be automatically completed on line through network management software without adding extra human input. However, in the scheme, the attenuation of all the wavelengths is regarded as the same, the attenuation difference of different wavelengths is not considered, the calibration result is inevitably very rough, and an error of 3-4dB is often introduced. Such errors increase with the number of cascaded WSSs and other optical passive devices, and are strongly correlated with the WDL characteristics of each optical passive device, making it more difficult to accurately know and update the network state.

In summary, the prior art still cannot perform accurate online calibration on the WDL of the configurable site, cannot know and update the state of the network in real time, and is not favorable for network maintenance and optimization.

Disclosure of Invention

The embodiment of the invention aims to provide a method for calibrating wavelength-dependent attenuation of a configurable site on line, which aims to solve the problem that WDL of the configurable site cannot be accurately known in the prior art, realize that WDL of the configurable site can be updated in real time at the beginning of network setup or after service wavelength is opened, and provide reliable input parameters for a planning algorithm so as to provide high-quality network service.

In one aspect, an embodiment of the present invention provides a method for calibrating wavelength-dependent attenuation of a configurable site online, where the method includes:

acquiring single-wave emergent light power of a wavelength to be calibrated, which is emitted by an optical amplifier at an emitting end;

carrying out wavelength penetration configuration on the configurable site, enabling the optical wave with the wavelength to be calibrated to penetrate through the configurable site and reach an optical amplifier at a receiving end, and detecting the incident optical power of the optical wave reaching the optical amplifier at the receiving end;

and obtaining the wavelength-dependent attenuation of the wavelength to be calibrated according to the single-wave emergent light power of the wavelength to be calibrated and the incident light power of the light wave reaching the optical amplifier of the receiving end.

Further, when there are a plurality of wavelengths to be calibrated, the wavelength pass-through configuration is performed on the configurable site, so that the optical wave with the wavelength to be calibrated passes through the configurable site to reach the optical amplifier at the receiving end, and detecting the incident optical power of the optical wave reaching the optical amplifier at the receiving end specifically includes:

and carrying out multiple wavelength pass-through configurations on the configurable site, wherein each wavelength pass-through configuration comprises: configuring one of a plurality of wavelengths to be calibrated to pass through the configurable site, blocking light waves of other wavelengths of the wavelengths to be calibrated from passing through the configurable site, and the wavelengths of the light waves passing through the configurable site each time are different;

the incident optical power of the optical wave reaching the receiving end optical amplifier is detected after each wavelength pass-through configuration is completed.

Specifically, when no service wavelength exists in the configurable site, the obtaining of the wavelength-dependent attenuation of the wavelength to be calibrated according to the single-wave emergent optical power of the wavelength to be calibrated and the incident optical power of the optical wave reaching the optical amplifier at the receiving end specifically includes:

by solving the equation: l (lambda)_i)＝P_out(λ_i)-PD_in，iThe wavelength-dependent attenuation is obtained in that,

wherein,

L(λ_i) For configurable sites with respect to the wavelength λ to be calibrated_iWavelength dependent attenuation of (d);

P_out(λ_i) For said wavelength λ to be calibrated_iThe single wave emergent light power of (2);

PD_in，isaid wavelength λ to be calibrated for reaching the receiving optical amplifier_iThe incident light power of the light wave.

Further, when the configurable site already has a service wavelength, before performing wavelength pass-through configuration on the configurable site, so that the optical wave with the wavelength to be calibrated passes through the configurable site to reach the optical amplifier at the receiving end, and detecting the incident optical power of the optical wave reaching the optical amplifier at the receiving end, the method further includes:

detecting the initial incident light power of the light wave received by the receiving end optical amplifier;

the wavelength-dependent attenuation obtained according to the single-wave emergent light power of the wavelength to be calibrated and the incident light power of the light wave reaching the optical amplifier at the receiving end is specifically as follows:

by solving the equation: l (lambda)_i)=P_out(λ_i)-10*log₁₀(10^(0.1*PD_in，i)-10^(0.1*PD_in0) To obtain the wavelength-dependent attenuation,

wherein,

L(λ_i) For configurable sites with respect to the wavelength λ to be calibrated_iWavelength dependent attenuation of (d);

P_out(λ_i) For said wavelength λ to be calibrated_iThe single wave emergent light power of (2);

PD_in，ifor reaching the optical amplifier at the receiving end, the optical amplifier contains the service wavelength and the wavelength lambda to be calibrated_iThe incident light power of the light wave of (a);

PD_in0is the initial incident optical power.

Further, the optical power of the optical wave with the wavelength to be calibrated, which penetrates through the configurable station, is lower than the optical power of the service wavelength.

On the other hand, an embodiment of the present invention provides another method for calibrating wavelength-dependent attenuation of a configurable site online, where the method includes:

enabling the transmitting end optical amplifier to work in a spontaneous radiation state, and controlling the spontaneous radiation intensity of the transmitting end optical amplifier to be in a spontaneous radiation intensity;

acquiring the composite wave emergent light power containing the wavelength to be calibrated and emitted by the transmitting end optical amplifier;

carrying out wavelength punch-through configuration on the configurable site for preset times, wherein in each wavelength punch-through configuration, only one optical wave with a wavelength to be calibrated passes through the configurable site to reach a receiving end optical amplifier, optical waves with other wavelengths are blocked from passing through the configurable site, and the wavelengths of the optical waves passing through the configurable site at each time are different; after each time of through configuration is finished, detecting the incident light power of the light wave reaching the optical amplifier at the receiving end;

judging whether the change times of the spontaneous emission intensity of the transmitting end optical amplifier reach a preset value or not; if yes, determining wavelength-dependent attenuation according to the composite wave emergent light power obtained when the transmitting-end optical amplifier is under various spontaneous radiation intensities and the incident light power of the light wave reaching the receiving-end optical amplifier; if not, changing the spontaneous radiation intensity of the optical amplifier at the transmitting end, and jumping to the obtained composite wave emergent light power which is emitted by the optical amplifier at the transmitting end and contains the wavelength to be calibrated, wherein the preset value is greater than or equal to the number of the wavelength to be calibrated minus 1.

Specifically, the determining the wavelength-dependent attenuation according to the composite wave emergent light power obtained when the transmitting-end optical amplifier is under various spontaneous emission intensities and the incident light power of the light wave reaching the receiving-end optical amplifier specifically comprises:

by solving for n about L (lambda)_i) Determining wavelength dependent attenuation in the system of equations of the i-ary equation;

the i-element linear equation is as follows: 10 log₁₀(Σ_i10^(0.1*(PD^k _in，i+L(λ_i))))=PD^k _out-ζ^k，

Wherein i and k are natural numbers,

m, where m is the number of wavelengths to be calibrated; sigma_iThe sum of the optical power values of all the wavelengths to be calibrated is represented;

k＝1，2，3...n；n≥m；

PD^k _outthe power of the composite wave emergent light when the transmitting end optical amplifier is in the kth spontaneous emission intensity;

PD^k _in，iwhen the transmitting end optical amplifier is at the k-th spontaneous emission intensity, the wavelength is lambda_iThe light wave reaches the incident light power of the optical amplifier at the receiving end;

L(λ_i) For configurable sites with respect to the wavelength λ to be calibrated_iWavelength dependent attenuation of (d);

ζ^kthe ratio of the composite emergent light power of the transmitting end optical amplifier to the total emergent light power of all the pre-configured through wavelengths when the transmitting end optical amplifier is in the kth spontaneous emission intensity.

In another aspect, an embodiment of the present invention provides an apparatus for calibrating wavelength-dependent attenuation of a configurable station online, where the apparatus includes:

the acquiring unit is used for acquiring the single-wave emergent light power of the wavelength to be calibrated, which is emitted by the transmitting end optical amplifier;

the wavelength configuration and detection unit is used for carrying out wavelength through configuration on the configurable site, enabling the optical wave with the wavelength to be calibrated to pass through the configurable site to reach the optical amplifier of the receiving end, and detecting the incident light power of the optical wave reaching the optical amplifier of the receiving end;

and the processing unit is used for obtaining the wavelength-dependent attenuation of the wavelength to be calibrated according to the single-wave emergent light power of the wavelength to be calibrated and the incident light power of the light wave reaching the optical amplifier at the receiving end.

Further, the wavelength configuration and detection unit includes:

a configuration module, configured to perform multiple wavelength pass-through configurations on the configurable site, where each wavelength pass-through configuration is: configuring one of a plurality of wavelengths to be calibrated to pass through the configurable site, blocking light waves of other wavelengths of the wavelengths to be calibrated from passing through the configurable site, and the wavelengths of the light waves passing through the configurable site each time are different;

and the detection module is used for detecting the incident light power of the light wave reaching the receiving end optical amplifier after the wavelength feed-through configuration is completed each time.

Specifically, when the configurable site has no service wavelength, the processing unit includes:

first operation moduleFor use in solving the equation: l (lambda)_i)＝P_out(λ_i)-PD_in，iThe wavelength-dependent attenuation is obtained in that,

wherein,

L(λ_i) For configurable sites with respect to the wavelength λ to be calibrated_iWavelength dependent attenuation of (d);

P_out(λ_i) For said wavelength λ to be calibrated_iThe single wave emergent light power of (2);

PD_in，isaid wavelength λ to be calibrated for reaching the receiving optical amplifier_iThe incident light power of the light wave.

Further, when the configurable station already has a service wavelength, the apparatus further includes:

the initial detection unit is used for detecting the initial incident light power of the light waves received by the receiving end optical amplifier;

the processing unit includes:

a second operation module for solving the equation: l (lambda)_i)=P_out(λ_i)-10*log₁₀(10^(0.1*PD_in，i)-10^(0.1*PD_in0) To obtain the wavelength-dependent attenuation,

wherein,

L(λ_i) For configurable sites with respect to the wavelength λ to be calibrated_iWavelength dependent attenuation of (d);

P_out(λ_i) For said wavelength λ to be calibrated_iThe single wave emergent light power of (2);

PD_in，ifor reaching the optical amplifier at the receiving end, the optical amplifier contains the service wavelength and the wavelength lambda to be calibrated_iThe incident light power of the light wave of (a);

PD_in0is the initial incident optical power.

In another aspect, an embodiment of the present invention provides a wavelength division multiplexing optical communication system, including the above apparatus for calibrating wavelength-dependent attenuation of a configurable site online.

In another aspect, an embodiment of the present invention provides another apparatus for calibrating wavelength-dependent attenuation of a configurable station online, where the apparatus includes: the initial setting unit is used for enabling the transmitting end optical amplifier to work in a spontaneous radiation state and controlling the spontaneous radiation intensity of the transmitting end optical amplifier to be in a spontaneous radiation intensity;

the acquiring unit is used for acquiring the composite wave emergent light power which is emitted by the transmitting end optical amplifier and contains the wavelength to be calibrated;

the wavelength configuration and detection unit is used for carrying out wavelength pass-through configuration on the configurable site for preset times, wherein each wavelength pass-through configuration enables only one type of light wave with the wavelength to be calibrated to pass through the configurable site to reach a receiving end optical amplifier, light waves with other wavelengths are blocked from passing through the configurable site, and the wavelengths of the light waves passing through the configurable site at each time are different; after each time of through configuration is finished, detecting the incident light power of the light wave reaching the optical amplifier at the receiving end;

the processing unit is used for judging whether the change times of the spontaneous emission intensity of the transmitting end optical amplifier reach a preset value or not; if yes, determining wavelength-dependent attenuation according to the composite wave emergent light power obtained when the transmitting-end optical amplifier is under various spontaneous radiation intensities and the incident light power of the light wave reaching the receiving-end optical amplifier; if not, changing the spontaneous radiation intensity of the optical amplifier at the transmitting end, and jumping to the obtained composite wave emergent light power which is emitted by the optical amplifier at the transmitting end and contains the wavelength to be calibrated, wherein the preset value is greater than or equal to the number of the wavelength to be calibrated minus 1.

Further, the processing unit includes:

an operation module for obtaining L (lambda) by solving the N-related_i) Equation system of the i-element equationTo the wavelength dependent attenuation;

the i-element linear equation is as follows: 10 log₁₀(Σ_i10^(0.1*(PD^k _in，i+L(λ_i))))=PD^k _out-ζ^k，

Wherein i and k are natural numbers,

m, where m is the number of wavelengths to be calibrated; sigma_iThe sum of the optical power values of all the wavelengths to be calibrated is represented;

k＝1，2，3...n；n≥m；

PD^k _outthe power of the composite wave emergent light when the transmitting end optical amplifier is in the kth spontaneous emission intensity;

PD^k _in，iwhen the transmitting end optical amplifier is at the k-th spontaneous emission intensity, the wavelength is lambda_iThe light wave reaches the incident light power of the optical amplifier at the receiving end;

L(λ_i) For configurable sites with respect to the wavelength λ to be calibrated_iWavelength dependent attenuation of (d);

ζ^kthe ratio of the composite emergent light power of the transmitting end optical amplifier to the total emergent light power of all the pre-configured through wavelengths when the transmitting end optical amplifier is in the kth spontaneous emission intensity.

In another aspect, an embodiment of the present invention provides another wavelength division multiplexing optical communication system, including the above another apparatus for calibrating wavelength-dependent attenuation of a configurable site online.

The embodiment of the invention carries out wavelength through configuration on the configurable sites, so that the optical waves with the wavelengths to be calibrated pass through the configurable sites one by one, and determines the wavelength-related attenuation of the optical waves with the wavelengths to be calibrated when passing through the configurable sites by combining the optical power detection of the transmitting-end optical amplifier and the receiving-end optical amplifier. The method is extremely strong in adaptability to scenes, and can determine the wavelength-dependent attenuation of each physical link no matter whether the actual service is loaded or not, so that the wavelength-dependent attenuation of each channel can be known and updated in real time, and reliable input parameters are provided for a planning algorithm. In addition, because the method can calibrate the wavelength-dependent attenuation of each physical link, and does not consider different links equally, compared with the traditional offline calibration technology and the technology without considering the wavelength-dependent attenuation, the method eliminates the calibration error caused by the attenuation difference of different links, and ensures that the calibration of the wavelength-dependent attenuation is more accurate. And when the network state changes (such as replacing or adding a passive device or melting fiber again), the updated wavelength-related attenuation can be measured by the method, so that the network state can be updated in time, and the high-quality communication quality is ensured. In addition, the embodiment of the invention can realize the on-line calibration of the wavelength-dependent attenuation completely based on the existing network environment without adding any hardware, thereby effectively controlling the increase of the cost.

Drawings

FIG. 1 is a schematic diagram of a prior art network topology of a ROADM site;

FIG. 2 is a prior art WDL profile for a single WSS experimentally measured;

FIG. 3 is a schematic diagram of the physical links of a ROADM site in the prior art;

FIG. 4 is a WDL characteristic of prior art fiber fuse time versus fiber fuse point;

FIG. 5 is a flowchart of a method for calibrating wavelength-dependent attenuation of a configurable site online according to a first embodiment of the present invention; FIG. 6 is a flowchart of a method for calibrating wavelength-dependent attenuation of a configurable site online according to a third embodiment of the present invention;

FIG. 7 is a flowchart of a method for calibrating wavelength-dependent attenuation of a configurable site online according to a fourth embodiment of the present invention;

fig. 8 is a flowchart of a method for calibrating wavelength-dependent attenuation of a configurable site online according to a fifth embodiment of the present invention;

FIG. 9 is a flowchart of a method for calibrating wavelength-dependent attenuation of a configurable site online according to a sixth embodiment of the present invention;

FIG. 10 is a flowchart of a method for calibrating wavelength-dependent attenuation of a configurable site online according to a seventh embodiment of the present invention;

fig. 11 is a diagram of an apparatus for calibrating wavelength-dependent attenuation of a configurable site online according to an eighth, ninth, tenth, and eleventh embodiment of the present invention;

fig. 12 is a diagram illustrating an apparatus for calibrating wavelength-dependent attenuation of a configurable site online according to a twelfth embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The following detailed description of specific implementations of the present invention is provided in conjunction with specific embodiments:

the first embodiment is as follows:

fig. 5 shows a flowchart of a method for calibrating wavelength-dependent attenuation of a configurable site online according to a first embodiment of the present invention, and for convenience of description, only the part related to this embodiment is shown.

In step S101, the single-wave outgoing optical power of the wavelength to be calibrated, which is emitted from the transmitting-end optical amplifier, is obtained.

In the embodiment of the present invention, the transmitting-end optical amplifier (abbreviated as "transmitting-end optical amplifier") emits the light wave containing the wavelength to be calibrated. The light wave may be a complex wave (including light waves of various wavelengths), or a single wave (including only one wavelength), where the complex wave may be derived from spontaneous radiation emitted by the emitting light, and the single wave may be obtained by an external monochromatic light source (such as a laser or a monochromatic conventional light source). Stimulated radiation and spontaneous radiation are phenomena commonly existing in an optical amplifier, the optical amplifier amplifies an input optical signal by utilizing the stimulated radiation, when the optical amplifier works, if no optical signal is input into the optical amplifier, only spontaneous radiation exists in the optical amplifier, if an optical signal is input into the optical amplifier, both spontaneous radiation and stimulated radiation exist in the optical amplifier, and only the stimulated radiation is dominant at the moment. When only spontaneous radiation is emitted from the optical amplifier, the optical amplifier outputs optical signals of various wavelengths. When the optical amplifier has both spontaneous emission and stimulated emission, the optical amplifier will output optical signals with various wavelengths, except that the power of the optical signal with the same wavelength as the input optical signal is much higher than that of the optical signals with other wavelengths. Therefore, in the embodiment of the invention, the wavelength dependent attenuation can be calibrated based on the composite wave generated by the spontaneous radiation of the optical amplifier.

In the existing optical amplifier, a power monitoring device generally monitors the optical power of the optical wave at the input port of the optical amplifier and the optical power of the optical wave at the output port of the optical amplifier, however, if the optical wave input to the optical amplifier is a composite wave, the power monitoring device monitors the optical power of the optical wave at the input port to obtain the total incident optical power of the composite wave, and correspondingly, the power of the optical wave at the output port to obtain the total emergent optical power of the composite wave; if the light wave input to the optical amplifier is a single wave, the power monitoring device monitors the optical power of the light wave at the input port to obtain the incident optical power of the single wave, and correspondingly, the optical power of the light wave at the output port is monitored to obtain the emergent optical power of the single wave. In most of the existing applications, the input to the optical amplifier is a complex wave, and in order to obtain the optical power of each wavelength, the optical wave emitted from the light source can be monitored by an OPM (optical performance monitoring) device, so as to obtain the emergent optical power of each wavelength. It should be noted that, besides OPM, any device that can obtain the optical power of each single wavelength by performing power detection on the complex wave can be used in the present invention, and the embodiment of the present invention is not limited to this. In addition to this, the present invention is,

specifically, when the emitting light source is not externally connected with a monochromatic light source, the emitting light source can be controlled to be in a spontaneous radiation state to enable the emitting light source to radiate out a composite wave, and then the single-wave emergent light power of each wavelength to be calibrated in the composite wave is detected through the OPM device. When the emitting light amplifier is connected with the monochromatic light source, the single waves with different wavelengths can be obtained by replacing the monochromatic light source one by one, and the single wave emergent light power of each single wave when the emitting light is emitted from the emitting light is detected by the OPM device.

In step S102, wavelength pass-through configuration is performed on the configurable site, so that the optical wave with the wavelength to be calibrated passes through the configurable site to reach the optical amplifier at the receiving end, and the incident optical power of the optical wave reaching the optical amplifier at the receiving end is detected;

in the embodiment of the present invention, after obtaining the single-wave emergent light power of the light wave from the transmitting end, the light waves with wavelengths to be calibrated need to be configured through the configurable sites one by one, and after the light wave with each wavelength passes through the configurable sites, the incident light power when the light wave with each wavelength reaches the receiving end optical amplifier (referred to as "receiving end optical amplifier") needs to be detected, so as to obtain the incident light power when all the light waves with wavelengths to be calibrated reach the receiving end optical amplifier, so as to provide data for determining the WDL.

The incident light power can be obtained by directly inquiring the reported reading of the incident light power of the receiving end optical amplifier. This is the existing function of the wdm network and will not be described in detail in this embodiment.

In step S103, the wavelength-dependent attenuation of the wavelength to be calibrated is obtained according to the single-wave emergent optical power of the wavelength to be calibrated and the incident optical power of the optical wave reaching the optical amplifier at the receiving end.

In the embodiment of the present invention, the unit of the single-wave emergent light power and the unit of the incident light power are dBm, and the unit of the wavelength-dependent attenuation or gain is dB, and both are positive numbers, which is also applicable to the following embodiments.

The embodiment of the invention carries out wavelength through configuration on the configurable site, so that the optical waves with the wavelengths to be calibrated pass through the configurable site one by one, and determines the WDL generated when the optical waves with the wavelengths to be calibrated pass through the configurable site by combining the optical power detection of the transmitting-end optical amplifier and the receiving-end optical amplifier. The method is extremely strong in adaptability to scenes, and can determine the WDL of each physical link no matter whether the actual service is loaded or not, so that the WDL of each channel can be known and updated in real time, and reliable input parameters are provided for a planning algorithm. In addition, the method can calibrate the WDL of each physical link without considering different links, so that compared with the traditional offline calibration technology and the technology without considering WDL and the like, the method eliminates the calibration error caused by the attenuation difference of different links, and ensures that the WDL calibration is more accurate. And when the network state changes (such as replacing or adding a passive device or melting fiber again), the updated WDL can be actually measured by the method, so that the network state can be updated in time, and the high-quality communication quality is ensured. In addition, the embodiment of the invention can realize online calibration of WDL completely based on the existing network environment without adding any hardware, thereby effectively controlling the increase of cost.

Example two:

when wavelength-dependent attenuation needs to be calibrated for multiple wavelengths, the embodiment of the present invention provides a better implementation manner for step S102 on the basis of the first embodiment, which is as follows:

and carrying out multiple wavelength pass-through configurations on the configurable site, wherein each wavelength pass-through configuration comprises the following steps: configuring one wavelength in a plurality of wavelengths to be calibrated to pass through the configurable site, blocking light waves of other wavelengths in the wavelengths to be calibrated from passing through the configurable site, wherein the wavelengths of the light waves passing through the configurable site every time are different; and, after each wavelength pass-through configuration is completed, the incident optical power of the optical wave reaching the receiving-end optical amplifier is detected.

More specifically, the above method may be carried out by:

the method comprises the steps that firstly, a light wave with one wavelength in the wavelengths to be calibrated penetrates through a configurable site, and light waves with other wavelengths in the wavelengths to be calibrated are blocked from penetrating through the configurable site;

secondly, detecting the incident light power of the light wave reaching the receiving end;

thirdly, canceling the light wave through configuration;

fourthly, configuring another optical wave with the wavelength to be calibrated to pass through the configurable station, and blocking the optical waves with other wavelengths in the wavelength to be calibrated to pass through the configurable station;

fifthly, detecting the incident light power of the other light wave reaching the receiving end;

sixthly, canceling the through configuration of another light wave;

……

and repeating the steps until the light waves with all wavelengths to be calibrated are completely arranged in a penetrating way, and detecting the incident light power of each light wave reaching the optical amplifier at the receiving end.

In the above process, after completing the penetration configuration of one wavelength and the detection of the incident light power each time, it can be determined whether the number of times that different light waves penetrate through the configurable station reaches the preset number of times, where the preset number of times is greater than or equal to the number of wavelengths to be calibrated. If so, ending, otherwise, jumping to the first step, and continuing to detect the punch-through configuration and the incident light power of the next wavelength until the detection of the punch-through configuration and the incident light power of all the wavelengths to be calibrated is completed.

The embodiment of the invention can accurately obtain the incident light power of the optical amplifier at the receiving end of each wavelength to be calibrated by the method, has simple steps, high execution speed and difficult error occurrence, and provides accurate data for determining the WDL of the configurable station.

Example three:

fig. 6 shows a flowchart of a method for calibrating wavelength-dependent attenuation of a configurable site online according to a third embodiment of the present invention, and only the relevant portions are shown for convenience of description.

The embodiment of the invention is suitable for the situation that no service wavelength exists in the configurable site in the opening stage, and the OPM device is configured without an external monochromatic light source in the light amplification of the sending end, and the detailed contents are as follows:

in step S301, the emitting light is made to operate in a spontaneous emission state, and the spontaneous emission intensity of the emitting light is controlled to be at a spontaneous emission intensity;

in step S302, the OPM device detects the single-wave emergent light power P of each of the light waves with the wavelength to be calibrated in the spontaneously-radiated composite wave at the outgoing light port of the transmitting end_out(λ_i)；

Wherein λ is_iRepresents the wavelength at which feedthrough is configured, i ═ 1, 2, 3.. m; and m is the number of wavelengths to be calibrated.

In this step, P can be obtained_out(λ₁)、P_out(λ₂)…P_out(λ_m)；

In step S303, the wavelength λ is configured_iThe optical waves of the wavelength λ are queried by passing through the configurable site while blocking optical waves of other wavelengths of the wavelength to be calibrated from passing through the configurable site_iThe reported reading PD of the incident light power of the optical amplifier when the light wave reaches the receiving end_in,i；

In step S304, the wavelength λ is canceled_iThe light wave passing arrangement of (2);

in step S305, it is determined whether the number of times of configuring different optical waves to pass through the configurable site reaches the preset number, if yes, step S306 is performed, otherwise, step S303 is skipped.

In the step, the preset times are more than or equal to the number of the wavelengths to be calibrated.

In step S306, the wavelength-dependent attenuation is obtained by solving the following equation;

the equation is specifically: l (lambda)_i)=P_out(λ_i)-PD_in,i

Wherein,

L(λ_i) For configurable sites with respect to the wavelength λ to be calibrated_iWavelength dependent attenuation of (d);

P_out(λ_i) For a wavelength λ to be calibrated_iThe single wave emergent light power of (2);

PD_in，iwavelength lambda to be calibrated for optical amplification to reach receiving end_iThe incident light power of the light wave.

The embodiment of the invention can detect the single-wave emergent light power of the light amplifier at the transmitting end through the conventional OPM device under the condition that the light amplifier at the transmitting end is not externally connected with a monochromatic light source, and realizes the online calibration of WDL without additionally arranging hardware such as an external light source and the like.

Of course, the embodiment of the present invention can also be used in a case where the broadband light source is placed in the transmitting light, and the complex wave can be directly obtained through the broadband light source.

Example four:

fig. 7 shows a flowchart of a method for calibrating wavelength-dependent attenuation of a configurable site online according to a fourth embodiment of the present invention, and only the relevant parts to this embodiment are shown for convenience of description.

The embodiment of the invention is suitable for the situation that no service wavelength exists in the configurable site in the opening stage, a monochromatic light source is externally connected to a light source at the transmitting end and an OPM device is arranged, and the detailed contents are as follows:

in step S401, an emission wavelength λ is configured at the emitting end light amplifier_iAnd the single-wave emergent light power P of the light emitted by the single-color light source when the light is emitted from the emitting end is detected by the OPM device_out(λ_i)；

In step S402, the wavelength λ is configured_iThe optical wave passes through the configurable site and inquires the reported reading PD of the incident optical power of the optical amplifier when the optical wave reaches the receiving end_in,i；

In the embodiment of the invention, the wavelength λ can be configured_iThe light waves pass through the configurable station and are blocked from other light waves at the same time, so that the accuracy of the detection data is improved.

In step S403, the wavelength λ is canceled_iThe light wave passing arrangement of (2);

in step S404, it is determined whether the number of times of configuring different optical waves to reach the configurable site reaches a preset number, if yes, step S405 is performed, otherwise, step S401 is skipped;

in the step, the preset times are more than or equal to the number of the wavelengths to be calibrated;

in this step, when the number of the configuration punchthrough reaches the preset number, the external light source can be evacuated to recover the normal operation of the station.

In the embodiment of the present invention, the monochromatic light source may specifically be a monochromatic light source with a single light-emitting wavelength; or a monochromatic light source consisting of a wide-spectrum light source and a filter, and when light waves with certain wavelength are needed, the monochromatic light source with the needed wavelength can be obtained by replacing the filter. The monochromatic light source in the present embodiment may be any one of the two monochromatic light sources described above.

In step S405, the wavelength dependent attenuation is determined by solving the following equation;

the equation is specifically: l (lambda)_i)=P_out(λ_i)-PD_in,i

Wherein, L (lambda)_i)、P_out(λ_i)、PD_in,iThe same meanings as in the above-mentioned embodiment.

The principle of the embodiment of the invention is the same as that of the third embodiment, and the embodiments are all suitable for the situation that the configurable site has no service wavelength in the opening stage, and the optical power of the transmitting-end optical amplifier and the receiving-end optical amplifier is respectively detected, and then the single-wave emergent optical power is subtracted from the incident optical power to obtain the wavelength-related attenuation. The difference is that the third embodiment is suitable for the case without a monochromatic light source, and the emergent light of the third embodiment is a spontaneous emission complex wave, and the single-wave emergent light power of the light wave with each wavelength to be calibrated needs to be detected through the OPM device. The single-wave emitting light is obtained by replacing the single-wave light source, and then the single-wave emitting light power is detected by the OPM device. Further, it can be determined that the present embodiment is also applicable to the case where the OPM device is not provided, because the originating light amplifier can be configured with monochromatic light sources with different wavelengths, and can directly query the single-wave emergent light power of the single wave at the originating light amplifier outlet. However, in this embodiment, it is still preferable to detect the single-wave emitted light power by the OPM device, so as to improve the detection accuracy.

Example five:

fig. 8 shows a flowchart of a method for calibrating wavelength-dependent attenuation of a configurable site online according to a fifth embodiment of the present invention, and only the relevant parts to this embodiment are shown for convenience of description.

The embodiment of the invention is suitable for the condition that a plurality of physical links of the configurable site in the capacity expansion stage have service wavelengths, and a monochromatic light source is not arranged in a transmitting-end optical amplifier but an OPM device is configured, and the detailed contents are as follows:

in step S501, the transmitting-end optical amplifier is maintained in a normal operating state to control the optical power of the optical signal with the existing service wavelength emitted from the transmitting-end optical amplifier to be unchanged; the purpose of this step is to avoid affecting the existing traffic wavelengths.

In step S502, the OPM device detects the single-wave emergent light power P of each wavelength to be calibrated in the composite wave of the emitted spontaneous emission of the emitting light_out(λ_i) And inquiring the reported reading PD of the initial incident light power of the light wave reaching the receiving end optical amplifier_in0。

In this embodiment, since the optical waves with service wavelengths pass through the originating optical amplifier, there are both spontaneous emission and stimulated emission in the originating optical amplifier, and the spontaneous emission generates optical waves with various wavelengths and is output from the optical amplifier. Since the spontaneous radiation emitted by the emitting light can generate light waves with various wavelengths, the light waves with wavelengths to be calibrated inevitably exist in the composite wave generated by the spontaneous radiation emitted by the emitting light, and therefore, in the step S502, the single-wave emergent light power of each wavelength to be calibrated in the composite wave emitted by the emitting light can be detected.

In an embodiment of the invention, the OPM device can detect all service wavelengths λ_jAnd optical power of other wavelengths, wherein the service wavelength λ_jOptical power P of_out(λ_j) Not used to calculate wavelength dependent attenuation;

reported reading PD of optical amplifier query at receiving end_in0The optical power of the incident light with the service wavelength is the initial incident light power of the optical amplifier when the wavelength to be calibrated is not configured to pass through.

In step S503, the wavelength λ is configured_iThe optical waves of other wavelengths in the wavelengths to be calibrated are blocked from passing through the configurable site, and the reported reading PD of the incident optical power of the optical waves reaching the receiving end optical amplifier is inquired_in,i；

In the embodiment of the invention, the reading PD is reported_in,iIncluding the service wavelength lambda_jAnd configuring the wavelength λ to be calibrated to pass through_iTotal incident light power of;

in the step ofIn S504, the wavelength λ is canceled_iThe feedthrough arrangement of (a);

in step S505, it is determined whether the number of times of configuring different optical wave passes reaches a predetermined number, if yes, step S506 is performed, otherwise, step S503 is skipped.

In the step, the preset times are more than or equal to the number of the wavelengths to be calibrated.

In step S506, by solving the equation:

L(λ_i)=P_out(λ_i)-10*log₁₀(10^(0.1*PD_in,i)-10^(0.1*PD_in0) To obtain a wavelength-dependent attenuation of the light,

wherein,

L(λ_i) For configurable sites with respect to the wavelength λ to be calibrated_iWavelength dependent attenuation of (d);

P_out(λ_i) For a wavelength λ to be calibrated_iThe single wave emergent light power of (2);

PD_in，ifor reaching the optical amplifier at the receiving end, the optical amplifier contains the service wavelength and the wavelength lambda to be calibrated_iThe incident light power of the light wave of (a);

PD_in0is the initial incident optical power.

In the above formula, 10 × log₁₀(10^(0.1*PD_in，i)-10^(0.1*PD_in0) I.e. represents a wavelength of λ_iThe light wave reaches the incident light power of the receiving end optical amplifier.

In an embodiment of the invention, the incident light power is "10 log₁₀(10^(0.1*PD_in，i)-10^(0.1*PD_in0) "and PD in examples three and four above_in,iAll have the same meaning and are at a wavelength of lambda_iTherefore, the WDL determination method in the embodiments of the present invention is substantially the same as that in the above embodiments, and the difference between the outgoing light power of the single wave and the incoming light power is determined as the wavelength-dependent attenuation. Only the difference lies in: in the third and fourth embodiments, no service wavelength is open, and the light received by the receiving end optical amplifier only includes the wavelength configured to pass through, so that the optical power detected by the receiving end optical amplifier is the incident optical power of the optical wave to be detected. In the embodiment of the invention, the configurable site has an open service wavelength, and because the receiving-end optical amplifier cannot distinguish the wavelength to be detected and the service wavelength, the initial incident optical power of the service wavelength needs to be detected at the receiving-end optical amplifier before the feedthrough is configured, then the optical feedthrough is configured, the total incident optical power is detected, the total incident optical power is subtracted from the initial incident optical power, and the WDL is determined.

The embodiment of the invention can detect WDLs of all unopened links after the service wavelength is opened, does not influence the opened service, does not need to increase hardware and has high detection precision.

Example six:

fig. 9 shows a flowchart of a method for calibrating wavelength-dependent attenuation of a configurable site online according to a sixth embodiment of the present invention, and only the relevant portions to this embodiment are shown for convenience of description.

The embodiment of the invention is suitable for the condition that a plurality of physical links of the configurable site in the capacity expansion stage have service wavelengths and a monochromatic light source and an OPM device are configured in a light amplifier at a transmitting end, and the detailed contents are as follows:

in step S601, a reported reading PD of the initial incident optical power of the optical amplifier when the optical wave with the service wavelength reaches the receiving end is queried_in0；

In step S602, a wavelength λ is configured at the emitting light source_iThe single-wave emergent light power P of the light wave emitted by the single-wave light source when the light wave is emitted by the emitting end is detected by the OPM device_out(λ_i)；

In step S603, the wavelength λ is configured_iThe optical wave passes through the configurable station and reports the incident optical power of the optical amplifier at the receiving endReading PD_in,i；

Reporting reading PD_in，iWavelength λ to be calibrated including service wavelength and configuration feedthrough_iTotal incident optical power.

In the embodiment of the invention, other light waves in the light wave to be calibrated can be blocked while the configuration light wave passes through the configurable station, so that the accuracy of detection data is improved.

In step S604, the wavelength λ is canceled_iThe light wave passing arrangement of (2);

in step S605, it is determined whether the number of times of configuring different optical waves to reach the configurable site reaches a preset number, if yes, step S606 is performed, otherwise, step S602 is skipped;

in the step, the preset times are more than or equal to the number of the wavelengths to be calibrated;

in step S606, the wavelength dependent attenuation is obtained by solving the following equation,

the equation is specifically: l (lambda)_i)＝P_out(λ_i)-10*log₁₀(10^(0.1*PD_in，i)-10^(0.1*PD_in0)). The physical quantities in the equation are the same as those in the fifth embodiment, the embodiments of the present invention are substantially the same as those in the fifth embodiment, and are all applicable to the expansion stage, and the incident light powers of the optical waves to be calibrated are the differences between the total incident light power and the initial incident light power of the service wavelength.

In the embodiment of the present invention, in order not to affect the opened service, the optical power of the optical wave generated by the monochromatic light source may be lower than the optical power of the service wavelength signal.

Preferably, the optical power of the light wave generated by the monochromatic light source is lower than the optical power of the existing service wavelength signal by more than 10 dB.

The monochromatic external light source in the embodiment of the invention is the same as that in the fourth embodiment, and is not described herein again.

Example seven:

fig. 10 shows a flowchart of a method for calibrating wavelength-dependent attenuation of a configurable site online according to a seventh embodiment of the present invention, and only the relevant parts to this embodiment are shown for convenience of description.

The embodiment of the invention is suitable for the situation that no service wavelength exists in the configurable site in the opening stage and the monochromatic light source and the OPM device are not configured in the emitting light.

Because the sending-end optical amplifier is not provided with a monochromatic light source and is not provided with an OPM device, the sending-end optical amplifier cannot acquire single-wave emergent light power but only composite-wave emergent light power. The method is mainly realized by the following steps:

in step S701, the transmitting-end light amplifier is operated in a spontaneous emission state, and the spontaneous emission intensity of the transmitting-end light amplifier is controlled to be at a spontaneous emission intensity;

in step S702, obtaining a composite wave emergent light power containing a wavelength to be calibrated, which is emitted by a light source;

in the embodiment of the invention, the light wave emitted by the spontaneous radiation is a composite wave and contains white light with all wavelengths to be calibrated, and the obtained composite wave emergent light power is the total emergent light power of the spontaneous radiation composite wave.

In step S703, wavelength pass-through configuration is performed on the configurable sites for a preset number of times, where each wavelength pass-through configuration allows only one optical wave with a wavelength to be calibrated to pass through the configurable sites to reach the optical amplifier at the receiving end, and optical waves with other wavelengths are blocked from passing through the configurable sites, and the wavelengths of the optical waves passing through the configurable sites at each time are different; after each time of through configuration is finished, detecting the incident light power of the light wave reaching the optical amplifier at the receiving end;

in step S704, it is determined whether the number of times of change of the spontaneous emission intensity of the transmitting-end optical amplifier reaches a preset value; if yes, go to step S705, if no, go to step S706: the spontaneous emission intensity of the transmitting-side optical amplifier is changed, and then it jumps to step S702.

In step S705, wavelength-dependent attenuation is determined according to the composite wave emergent light power obtained when the sending-end light amplifier is at various spontaneous emission intensities and the incident light power of the light wave reaching the receiving-end light amplifier.

In the embodiment of the invention, the preset value is greater than or equal to the number of the wavelengths to be calibrated minus 1.

In the embodiment of the invention, the composite wave emergent light power and the incident light power can be obtained by directly inquiring the reported reading of the light power of the sending-end light amplifier and the receiving-end light amplifier. This is the existing function of the wdm network and will not be described in detail in this embodiment.

The embodiment of the invention can be implemented under the condition that the sending-end optical amplifier is not provided with a monochromatic light source and an OPM device, determines WDL according to the composite wave emergent light power obtained when the sending-end optical amplifier is at different spontaneous radiation intensities and the incident light power reaching the receiving-end optical amplifier, can realize online calibration and network updating of WDL without adding any hardware, is simple to operate and does not increase the hardware cost.

Further, when the number of times of change of the spontaneous emission intensity of the emitted light reaches a preset value, the wavelength-dependent attenuation can be obtained by solving the following equation:

the system of equations is: 10 log₁₀(Σ_i10^(0.1*(PD^k _in，i+L(λ_i))))=PD^k _out-ζ^k，

Wherein i and k are natural numbers,

m, where m is the number of wavelengths to be calibrated; sigma_iThe sum of the optical power values of all the wavelengths to be calibrated is represented;

k＝1，2，3...n；n≥m；

PD^k _outthe power of the composite wave emergent light when the sending light is in the kth spontaneous emission intensity;

PD^k _in，iwhen the emitting light is in the k-th spontaneous emission intensity, the wavelength is lambda_iThe light wave reaches the incident light power of the receiving end light amplifier;

L(λ_i) For configurable sites with respect to the wavelength λ to be calibrated_iWavelength dependent attenuation of (d);

ζ^kthe ratio of the composite emergent light power of the emitting light to the total emergent light power of all the pre-configured through wavelengths is shown when the emitting light is in the kth spontaneous emission intensity. The value is related to the unevenness of the gain spectrum of the transmitting-end optical amplifier under the k-th spontaneous radiation intensity and the proportion of the total bandwidth of all the pre-calibrated wavelengths to the total gain spectrum bandwidth of the optical amplifier, and the unit is dB. Zeta at different spontaneous emission intensities^kThe difference is less than 0.2 dB.

The above equation set is specifically:

10*log₁₀(Σ_i10^(0.1*(PD¹ _in，1+L(λ_i))))=PD¹ _out-ζ¹

10*log₁₀(Σ_i10^(0.1*(PD² _in，2+L(λ_i))))=PD² _out-ζ²

10*log₁₀(Σ_i10^(0.1*(PD³ _in，3+L(λ_i))))=PD³ _out-ζ³

10*log₁₀(Σ_i10^(0.1*(PDⁿ _in，i+L(λ_i))))=PDⁿ _out-ζⁿ

in this embodiment, ζ^kCan be measured in advance, and zeta is measured under different spontaneous radiation intensities^kThe difference is only less than 0.2dB, becauseThis can make ζ¹=ζ²=…=ζⁿThe specific value can be based on a plurality of predicted zeta values^kThe value of (d) is determined, for example, by taking the average thereof. In actual practice, ζ^kThe detection system can be automatically input by an operator, and can also be pre-stored in the system and directly called during actual detection.

When ζ is^kFor a predetermined value, the system of equations has a unique solution when n ≧ m, and thus, the wavelength-dependent attenuation L (λ) can be uniquely determined by solving the system of equations₁)，L(λ₂)，L(λ₃)…L(λ_m). Taking 80 channels to be calibrated as an example, it is necessary to make the emitting light operate in at least 80 different states, and the above process of configuring the optical wave feedthrough and canceling the feedthrough is performed at least 80 × 80 times. It can be understood that when ζ^kIf the value is not predicted, the light source is required to operate in at least 81 different states, i.e. n is greater than or equal to m +1, and the above process of configuring the optical wave pass-through and canceling the pass-through is performed at least 81 x 80 times. Preferred pre-measured ζ for embodiments of the invention^k。

In the embodiment of the present invention, the preset value is used to limit the number of times of changing the spontaneous emission intensity of the emitting light, and according to the above, the above equation system has a unique solution only when the total number of the spontaneous emission intensities is greater than or equal to the number of the wavelengths to be calibrated, so the preset value in this embodiment needs to be greater than or equal to the number of the wavelengths to be calibrated minus 1.

Of course, the determination process in step S704 may also be implemented by determining the total number of the spontaneous emission intensities, and at this time, the preset value needs to be greater than or equal to the number of the wavelengths to be calibrated, so as to ensure that the above equation set has a unique solution.

It will be understood by those skilled in the art that all or part of the steps in the above embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, which may be ROM/RAM, magnetic disk, optical disk, etc.

Example eight:

fig. 11 is a diagram illustrating an apparatus for calibrating wavelength-dependent attenuation of a configurable site online according to an eighth embodiment of the present invention, and only the relevant parts are shown for convenience of illustration.

The obtaining unit 1 obtains the single-wave emergent light power of the wavelength to be calibrated, which is emitted by an emitting end optical amplifier (called as 'emitting end optical amplifier' for short);

the wavelength configuration and detection unit 2 performs wavelength pass-through configuration on the configurable site, so that the optical wave with the wavelength to be calibrated passes through the configurable site to reach an optical amplifier (called receiving end optical amplifier for short) at a receiving end, and detects the incident optical power of the optical wave reaching the receiving end optical amplifier;

the processing unit 3 obtains the wavelength-dependent attenuation of the wavelength to be calibrated according to the single-wave emergent light power of the wavelength to be calibrated and the incident light power of the light wave reaching the receiving end light amplifier.

In the embodiment of the invention, the light source at the transmitting end can emit light waves containing the wavelength to be calibrated. The light wave can be a complex wave or a single wave. The complex wave can be derived from spontaneous radiation emitted by the emitting light, and the single wave can be obtained by an external monochromatic light source (such as a laser or a monochromatic conventional light source). The obtaining unit 1 can perform power detection on the complex wave or the single wave to obtain corresponding data of the wavelength and the power, and further obtain single-wave emergent light power of the wavelength to be calibrated.

The embodiment of the invention carries out wavelength through configuration on the configurable sites through the wavelength configuration and detection unit, so that the optical waves with the wavelengths to be calibrated pass through the configurable sites one by one, and carries out power detection on the transmitting-end optical amplifier and the receiving-end optical amplifier through the acquisition unit and the wavelength configuration and detection unit so as to determine the WDL of the configurable sites. The device is extremely strong in adaptability to scenes, and WDLs of all physical links can be determined no matter whether actual services are loaded or not, so that WDLs of all channels can be known and updated in real time at the beginning of network set-up and after service wavelengths are opened, and reliable input parameters are provided for a planning algorithm. Compared with the traditional off-line calibration technology and the technology without considering WDL, the device can calibrate the WDL of each physical link without viewing different links, thereby eliminating the calibration error caused by the attenuation difference of different links and ensuring that the calibration of the WDL is more accurate. And when the network state changes (such as replacing or adding a passive device or melting fiber again), the updated WDL can be actually measured through the device, so that the network state can be updated in time, and the high-quality communication quality is ensured.

Example nine:

in the embodiment of the present invention, the wavelength configuring and detecting unit 2 may further include: a configuration module 21 and a detection module 22. The configuration module 21 performs multiple wavelength pass-through configurations on the configurable site, where each wavelength pass-through configuration is: configuring one wavelength in a plurality of wavelengths to be calibrated to pass through the configurable site, blocking light waves of other wavelengths in the wavelengths to be calibrated from passing through the configurable site, wherein the wavelengths of the light waves passing through the configurable site every time are different; the incident optical power of the optical wave reaching the receiving optical amplifier is detected by the detection module 22 after each wavelength pass-through configuration is completed.

More specifically, the configuration module 21 and the detection module 22 may perform the wavelength pass-through configuration and the detection of the incident light power according to the steps described in the second embodiment, which are not described herein again.

The embodiment of the invention realizes wavelength through configuration and detects the incident light power of the optical amplifier at the receiving end of each wavelength to be calibrated through the configuration module 21 and the detection module 22, has simple structure and high execution speed, is not easy to generate errors, and provides accurate data for determining the WDL of the configurable station.

Example ten:

the embodiment of the invention is suitable for the condition that no service wavelength exists in the configurable site. In particular, the processing unit3 may comprise a first calculation module 31 for calculating by solving the equation: l (lambda)_i)＝P_out(λ_i)-PD_in，iThe wavelength-dependent attenuation is obtained and,

wherein,

L(λ_i) For configurable sites with respect to the wavelength λ to be calibrated_iWavelength dependent attenuation of (d);

P_out(λ_i) For a wavelength λ to be calibrated_iThe single wave emergent light power of (2);

PD_in，iwavelength lambda to be calibrated for reaching the receiving optical amplifier_iThe incident light power of the light wave.

The data are obtained by the method provided in the third or fourth embodiment, and are not described again.

In the embodiment of the present invention, the first operation module 31 processes the data output by the acquisition unit 1 and the wavelength configuration and detection unit 2, so as to accurately obtain the WDL of the configurable station.

Example eleven:

the embodiment of the invention is suitable for the condition that the configurable site has the service wavelength. When the configurable site already has a service wavelength, the optical waves received by the receiving-end optical amplifier include both the optical waves with the wavelength to be detected and the optical waves with the service wavelength, and at this time, WDL cannot be obtained directly through the first operation module 31. Therefore, the apparatus for calibrating wavelength-dependent attenuation of a configurable station on line in this embodiment further includes an initial detection unit 4, which is mainly used for detecting an initial incident optical power of an optical wave received by the receiving-end optical amplifier before wavelength configuration.

At this point, the processing unit 3 comprises a second calculation module 32 for calculating, by solving the equation: l (lambda)_i)=P_out(λ_i)-10*log₁₀(10^(0.1*PD_in，i)-10^(0.1*PD_in0) To obtain a wavelength-dependent attenuation of the light,

wherein,

L(λ_i) For configurable sites with respect to the wavelength λ to be calibrated_iWavelength dependent attenuation of (d);

P_out(λ_i) For a wavelength λ to be calibrated_iThe single wave emergent light power of (2);

PD_in，ifor reaching the optical amplifier at the receiving end, the optical amplifier contains the service wavelength and the wavelength lambda to be calibrated_iThe incident light power of the light wave of (a);

PD_in0is the initial incident optical power.

The data can be obtained according to the methods provided in the fifth or sixth embodiments, and are not described herein.

The embodiment of the invention can detect WDLs of all unopened links after the service wavelength is opened, does not influence the opened service, does not need to increase hardware and has high detection precision.

Example twelve:

fig. 12 is a diagram illustrating an apparatus for calibrating wavelength-dependent attenuation of a configurable site online according to a twelfth embodiment of the present invention, and only the relevant portions are shown for convenience of illustration.

The embodiment of the invention is mainly suitable for the condition that the sending light is not provided with a monochromatic light source and an OPM device. When the sending-end light amplifier is not provided with a monochromatic light source, the composite wave can be obtained through the spontaneous radiation of the sending-end light amplifier, and meanwhile, because the sending-end light amplifier is not provided with an OPM device, the composite wave emergent light power of the composite wave and the incident light power of the light wave received by the receiving-end light amplifier can be obtained through directly inquiring the reported readings of the light power of the sending-end light amplifier and the light power of the receiving-end light amplifier.

In particular, the method comprises the following steps of,

the initial setting unit 1 makes the emitting light work in a spontaneous radiation state and controls the spontaneous radiation intensity of the emitting light to be in a spontaneous radiation intensity;

the obtaining unit 2 obtains the composite wave emergent light power containing the wavelength to be calibrated emitted by the emitting end;

the wavelength configuration and detection unit 3 performs wavelength pass-through configuration on the configurable sites for preset times, wherein each wavelength pass-through configuration enables only one type of light wave with a wavelength to be calibrated to pass through the configurable sites to reach the receiving end for optical amplification, light waves with other wavelengths are blocked from passing through the configurable sites, and the wavelengths of the light waves passing through the configurable sites at each time are different; after each time of through configuration is finished, detecting the incident light power of the light wave reaching the receiving end;

the wavelength allocation and detection unit 3 may include an allocation module and a detection module as described in the ninth embodiment.

The processing unit 4 judges whether the change times of the spontaneous emission intensity of the light emission of the transmitting end reaches a preset value; if yes, determining wavelength-dependent attenuation according to the composite wave emergent light power obtained when the light amplifier at the transmitting end is under various spontaneous radiation intensities and the incident light power of the light wave reaching the light amplifier at the receiving end; if not, changing the spontaneous radiation intensity of the light source of the sending end, and jumping to obtain the composite wave emergent light power which is emitted by the light source of the sending end and contains the wavelength to be calibrated, wherein the preset value is greater than or equal to the number of the wavelength to be calibrated minus 1.

The embodiment of the invention can determine the WDL according to the composite wave emergent light power obtained when the transmitting-end light amplifier is at different spontaneous radiation intensities and the incident light power reaching the receiving-end light amplifier under the condition that the transmitting-end light amplifier is not provided with a monochromatic light source and an OPM device, can realize online calibration and network updating of the WDL without adding any hardware, and has simple operation and no increase of hardware cost.

Further, the processing unit 4 may comprise an arithmetic block 41 for solving n related L (λ) values by solving_i) Obtaining wavelength-dependent attenuation by using the equation set of the i-element linear equation;

the i elementThe first-order equation is: 10 log₁₀(Σ_i10^(0.1*(PD^k _in，i+L(λ_i))))=PD^k _out-ζ^k，

Wherein i and k are natural numbers,

m, where m is the number of wavelengths to be calibrated; sigma_iThe sum of the optical power values of all the wavelengths to be calibrated is represented;

k＝1，2，3...n；n≥m；

PD^k _outthe power of the composite wave emergent light when the transmitting end optical amplifier is in the kth spontaneous emission intensity;

PD^k _in，iwhen the transmitting end optical amplifier is at the k-th spontaneous emission intensity, the wavelength is lambda_iThe light wave reaches the incident light power of the optical amplifier at the receiving end;

L(λ_i) For configurable sites with respect to the wavelength λ to be calibrated_iWavelength dependent attenuation of (d);

ζ^kthe ratio of the composite emergent light power of the emitting light to the total emergent light power of all the pre-configured through wavelengths is shown when the emitting light is in the kth spontaneous emission intensity. The value is related to the unevenness of the gain spectrum of the transmitting-end optical amplifier under the k-th spontaneous radiation intensity and the proportion of the total bandwidth of all the pre-calibrated wavelengths to the total gain spectrum bandwidth of the optical amplifier, and the unit is dB. Zeta at different spontaneous emission intensities^kThe difference is less than 0.2 dB.

The data may be obtained by the method provided in the seventh embodiment and calculated according to the method described in the seventh embodiment, which is not described herein again.

The device provided by each embodiment is suitable for a wavelength division multiplexing optical communication system, and is used for calibrating the WDL of the configurable station on line so as to know and update the network state in real time. The device realizes accurate online calibration of the WDL based on the cooperation of the functional units and the modules, eliminates the calibration error caused by the fact that the attenuation difference of different links is not considered in the traditional device, and enables the WDL to be calibrated more accurately; and when the network state changes (such as replacing or adding a passive device or melting the fiber again), the updated WDL can be measured by the device, and the network state can be updated in time. The device is not only suitable for the condition that the service wavelength is not opened in the opening stage, but also suitable for the condition that the service wavelength is opened, and can be calibrated based on the existing network environment, no new hardware is required to be added, the adaptability is strong, and the cost is low.

Meanwhile, it is understood that a wavelength division multiplexing optical communication system including the above-described apparatus is also within the scope of the present invention.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (5)

1. A method for calibrating wavelength dependent attenuation of a configurable site online, the method comprising:

enabling the transmitting end optical amplifier to work in a spontaneous radiation state, and controlling the spontaneous radiation intensity of the transmitting end optical amplifier to be in a spontaneous radiation intensity;

acquiring the composite wave emergent light power containing the wavelength to be calibrated and emitted by the transmitting end optical amplifier;

carrying out wavelength punch-through configuration on the configurable site for preset times, wherein in each wavelength punch-through configuration, only one optical wave with a wavelength to be calibrated passes through the configurable site to reach a receiving end optical amplifier, optical waves with other wavelengths are blocked from passing through the configurable site, and the wavelengths of the optical waves passing through the configurable site at each time are different; after each time of through configuration is finished, detecting the incident light power of the light wave reaching the optical amplifier at the receiving end; judging whether the change times of the spontaneous emission intensity of the transmitting end optical amplifier reach a preset value or not; if yes, determining wavelength-dependent attenuation according to the composite wave emergent light power obtained when the transmitting-end optical amplifier is under various spontaneous radiation intensities and the incident light power of the light wave reaching the receiving-end optical amplifier; if not, changing the spontaneous radiation intensity of the optical amplifier at the transmitting end, and jumping to the obtained composite wave emergent light power which is emitted by the optical amplifier at the transmitting end and contains the wavelength to be calibrated, wherein the preset value is greater than or equal to the number of the wavelength to be calibrated minus 1.

2. The method according to claim 1, wherein the determining the wavelength-dependent attenuation according to the composite wave emergent light power obtained by the transmitting-end optical amplifier under various spontaneous emission intensities and the incident light power of the light wave reaching the receiving-end optical amplifier is specifically:

by solving for n about L (lambda)_i) Determining wavelength dependent attenuation in the system of equations of the i-ary equation;

the i-element linear equation is as follows: 10 log₁₀(Σ_i10^(0.1*(PD^k _in,i+L(λ_i))))＝PD^k _out-ζ^k，

Wherein i and k are natural numbers,

m, where m is the number of wavelengths to be calibrated; sigma_iThe sum of the optical power values of all the wavelengths to be calibrated is represented;

k＝1，2，3...n；n≥m；

PD^k _outthe power of the composite wave emergent light when the transmitting end optical amplifier is in the kth spontaneous emission intensity;

PD^k _in,iwhen the optical amplifier is in the kth type at the transmitting endAt spontaneous emission intensity, wavelength is λ_iThe light wave reaches the incident light power of the optical amplifier at the receiving end;

L(λ_i) For configurable sites with respect to the wavelength λ to be calibrated_iWavelength dependent attenuation of (d);

ζ^kthe ratio of the composite emergent light power of the transmitting end optical amplifier to the total emergent light power of all the pre-configured through wavelengths when the transmitting end optical amplifier is in the kth spontaneous emission intensity.

3. An apparatus for calibrating wavelength dependent attenuation of a configurable site online, the apparatus comprising:

the initial setting unit is used for enabling the transmitting end optical amplifier to work in a spontaneous radiation state and controlling the spontaneous radiation intensity of the transmitting end optical amplifier to be in a spontaneous radiation intensity;

the acquiring unit is used for acquiring the composite wave emergent light power which is emitted by the transmitting end optical amplifier and contains the wavelength to be calibrated;

the wavelength configuration and detection unit is used for carrying out wavelength pass-through configuration on the configurable site for preset times, wherein each wavelength pass-through configuration enables only one type of light wave with the wavelength to be calibrated to pass through the configurable site to reach a receiving end optical amplifier, light waves with other wavelengths are blocked from passing through the configurable site, and the wavelengths of the light waves passing through the configurable site at each time are different; after each time of through configuration is finished, detecting the incident light power of the light wave reaching the optical amplifier at the receiving end;

the processing unit is used for judging whether the change times of the spontaneous emission intensity of the transmitting end optical amplifier reach a preset value or not; if yes, determining wavelength-dependent attenuation according to the composite wave emergent light power obtained when the transmitting-end optical amplifier is under various spontaneous radiation intensities and the incident light power of the light wave reaching the receiving-end optical amplifier; if not, changing the spontaneous radiation intensity of the optical amplifier at the transmitting end, and jumping to the obtained composite wave emergent light power which is emitted by the optical amplifier at the transmitting end and contains the wavelength to be calibrated, wherein the preset value is greater than or equal to the number of the wavelength to be calibrated minus 1.

4. The apparatus of claim 3, wherein the processing unit comprises:

an operation module for obtaining L (lambda) by solving the N-related_i) Obtaining the wavelength-dependent attenuation by using the equation set of the i-element linear equation;

the i-element linear equation is as follows: 10 log₁₀(Σ_i10^(0.1*(PD^k _in,i+L(λ_i))))＝PD^k _out-ζ^k，

Wherein i and k are natural numbers,

m, where m is the number of wavelengths to be calibrated; sigma_iThe sum of the optical power values of all the wavelengths to be calibrated is represented;

k＝1，2，3...n；n≥m；

PD^k _outthe power of the composite wave emergent light when the transmitting end optical amplifier is in the kth spontaneous emission intensity;

PD^k _in,iwhen the transmitting end optical amplifier is at the k-th spontaneous emission intensity, the wavelength is lambda_iThe light wave reaches the incident light power of the optical amplifier at the receiving end;

L(λ_i) For configurable sites with respect to the wavelength λ to be calibrated_iWavelength dependent attenuation of (d);

ζ^kthe ratio of the composite emergent light power of the transmitting end optical amplifier to the total emergent light power of all the pre-configured through wavelengths when the transmitting end optical amplifier is in the kth spontaneous emission intensity.

5. A WDM optical communication system comprising the apparatus for calibrating wavelength dependent attenuation at a configurable site online as claimed in claim 3 or 4.