CN108879305B - Remote pump pumping source device with OTDR function and control method - Google Patents
Remote pump pumping source device with OTDR function and control method Download PDFInfo
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- CN108879305B CN108879305B CN201810844246.5A CN201810844246A CN108879305B CN 108879305 B CN108879305 B CN 108879305B CN 201810844246 A CN201810844246 A CN 201810844246A CN 108879305 B CN108879305 B CN 108879305B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/071—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using a reflected signal, e.g. using optical time domain reflectometers [OTDR]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
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Abstract
The embodiment of the invention provides a remote pump pumping source device with an OTDR function and a control method, wherein the device comprises a laser unit, a circulator and a processing unit; wherein, the laser unit is respectively connected with the circulator and the processing unit; the circulator is used for transmitting a first optical signal emitted by the laser unit to the output optical fiber and transmitting a second optical signal returned by the output optical fiber to the processing unit; the processing unit is used for controlling the working state of the laser unit according to the second optical signal, and the working state comprises an OTDR state and a remote pump state. According to the remote pump pumping source device with the OTDR function and the control method, the OTDR function and the remote pump function are realized through the same laser unit, so that high OTDR equipment cost is saved, the problem that field detection of engineering personnel wastes time and labor is solved, real-time optical fiber line loss monitoring can be realized, and the danger of burning the end face of an optical fiber due to the fact that the end face of the optical fiber is not clean is avoided.
Description
Technical Field
The embodiment of the invention relates to the technical field of optical communication, in particular to a remote pump pumping source device with an OTDR function and a control method.
Background
An Optical Time Domain Reflectometer (OTDR) is an important instrument in Optical fiber communication, and a light source of the OTDR emits a specific Optical pulse signal, and according to the principle of reverse fresnel reflection and rayleigh scattering, the reflected Optical signal is received by an Optical receiving device and converted into an electrical signal, and then data is processed by a data processing unit to obtain parameters such as the fiber length of the measured Optical fiber. The OTDR is widely used in maintenance and construction of optical cable lines, and can perform measurement of optical fiber length, optical fiber transmission attenuation, joint attenuation, fault location, and the like.
At present, long-distance transmission systems generally do not separate from erbium-doped fiber amplifiers, raman optical amplifiers or hybrid fiber amplifiers formed by combining the erbium-doped fiber amplifiers and the raman optical amplifiers. Before a specific transmission system is opened, the state of the optical fiber needs to be detected in advance through the OTDR. In the field application of long-distance transmission, when optical communication equipment is networked, a special OTDR and a matched testing device need to be purchased to test and monitor the connected optical fibers, however, the testing and networking scheme is complex, the OTDR equipment is high in price, and these factors all cause the increase of the maintenance cost of the optical network.
In addition, in a long-distance transmission system, a remote pump pumping source belongs to high-power equipment, if an optical fiber end face is not clean in the system opening process, the danger of burning the optical fiber end face exists, and in addition, if the optical fiber is interrupted in the operation process, engineering personnel are required to carry OTDR equipment to carry out field test, the fault position of a line is diagnosed, and the operation is time-consuming and labor-consuming.
Disclosure of Invention
The embodiment of the invention provides a remote pump pumping source device with an OTDR function and a control method, which are used for solving the problems that the conventional OTDR equipment is high in price and time-consuming and labor-consuming in diagnosis operation in a long-distance transmission system.
In one aspect, an embodiment of the present invention provides a remote pump source device with an OTDR function, including a laser unit, a circulator, and a processing unit;
wherein, the laser unit is respectively connected with the circulator and the processing unit;
the circulator is used for transmitting a first optical signal emitted by the laser unit to the output optical fiber and transmitting a second optical signal returned by the output optical fiber to the processing unit;
the processing unit is used for controlling the working state of the laser unit according to the second optical signal, and the working state comprises an OTDR state and a remote pump state.
In another aspect, an embodiment of the present invention provides a method for controlling a pump source of a remote pump having an OTDR function, including:
controlling a laser unit to send a first optical signal to a circulator and then transmitting the first optical signal to an output optical fiber;
receiving a second optical signal returned by the output optical fiber transmitted by the circulator;
and controlling the working state of the laser unit according to the second optical signal, wherein the working state comprises an OTDR state and a remote pump state.
According to the remote pump pumping source device with the OTDR function and the control method, the OTDR function and the remote pump function are realized through the same laser unit, so that high OTDR equipment cost is saved, the problem that field detection of engineering personnel wastes time and labor is solved, real-time optical fiber line loss monitoring can be realized, and the danger of burning the end face of an optical fiber due to the fact that the end face of the optical fiber is not clean is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a remote pump source device with OTDR function according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a first-order remote pump source apparatus with OTDR function according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a second-order remote pump source apparatus with OTDR function according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a three-stage remote pump source apparatus with OTDR function according to an embodiment of the present invention;
fig. 5 is a schematic flowchart of a method for controlling a remote pump source with OTDR function according to an embodiment of the present invention;
description of reference numerals:
101-a laser unit; 102-a circulator; 103-a processing unit;
104-output fiber; 201-a laser; 301-pump set.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The Remote Pump (ROPA) technology is that a pumping part (RPU) of an erbium-doped fiber Amplifier is separated from a passive part (RGU) of an erbium-doped fiber and the like, the passive part (RGU) of the erbium-doped fiber is placed in the middle of a line, the pumping part (RPU) is placed in a machine room, pumping energy is transmitted to the erbium-doped fiber part in the middle of the line through a Remote optical fiber to excite the erbium-doped fiber to amplify signals, and a transmission distance of dozens of kilometers or even hundreds of kilometers is reserved between the pumping part and the erbium-doped fiber. The passive part placed in the middle of the line does not need power supply, so that the method is an effective solution for long-distance transmission.
The prior remote pump system is divided into a channel-associated remote pump system and a bypass remote pump system. The associated remote pump system, i.e. the signal light and the pump light, are transmitted in the same optical fiber, and the bypass remote pump system, i.e. the signal light and the pump light, are transmitted in different optical fibers. The free-path remote pump system and the bypass remote pump system can be applied respectively or simultaneously. The embodiment of the invention provides a remote pump pumping source device with an OTDR function, which can be applied to a channel-associated remote pump system and a bypass remote pump system, and fig. 1 is a schematic structural diagram of the remote pump pumping source device with the OTDR function in the embodiment of the invention, and as shown in fig. 1, the device comprises a laser unit, a circulator and a processing unit; wherein, the laser unit is respectively connected with the circulator and the processing unit; the circulator is used for transmitting a first optical signal emitted by the laser unit to the output optical fiber and transmitting a second optical signal returned by the output optical fiber to the processing unit; the processing unit is used for controlling the working state of the laser unit according to the second optical signal, and the working state comprises an OTDR state and a remote pump state.
Specifically, the laser unit has two operating states, namely an OTDR state and a remote pump state. The first signal light in the OTDR state is an OTDR pulse signal, and the second signal light is a reflected/scattered light signal generated based on Fresnel reflection or Rayleigh scattering; the first signal light is a pump light signal in a remote pump state, and the second signal light is a reflected light signal of the pump light signal.
When the laser unit is in the OTDR state, the first signal light emitted by the laser unit is an OTDR pulse signal, the OTDR pulse signal is transmitted to the circulator through the optical fiber, and the circulator transmits the OTDR pulse signal to the output optical fiber, where the output optical fiber is an optical fiber connected to the remote pump pumping source device having the OTDR function in the embodiment of the present invention, so that the OTDR pulse signal can be transmitted in an optical fiber link to be tested to which the output optical fiber is connected. Then, the output optical fiber transmits the returned second signal light, i.e., the reflected/scattered light signal generated based on fresnel reflection or rayleigh scattering, to the circulator, the circulator transmits the reflected/scattered light signal to the processing unit, and after the processing unit receives the reflected/scattered light signal, the processing unit controls the working state of the laser unit according to the reflected/scattered light signal, i.e., determines whether to switch the working state of the laser unit.
When the laser unit is in a remote pump state, first signal light emitted by the laser unit is a pump light signal, the pump light signal is transmitted to the circulator through the optical fiber, the circulator transmits the pump light signal to the output optical fiber, and the output optical fiber is the optical fiber connected with the remote pump pumping source device with the OTDR function in the embodiment of the invention, so that the pump light signal can be transmitted in an optical fiber link to be tested connected with the output optical fiber, and the erbium-doped optical fiber is excited to amplify the signal. And then, the output optical fiber transmits the returned second signal light, namely the reflected light signal of the pump light signal in a remote pump state to the circulator, the circulator transmits the reflected light signal to the processing unit, and the processing unit controls the working state of the laser unit according to the reflected light signal after receiving the reflected light signal, namely, judges whether to convert the working state of the laser unit.
In the embodiment of the invention, the OTDR and the remote pump function are realized by the same laser unit, so that the high OTDR equipment cost is saved, the problems of time and labor waste of field detection of engineering personnel are solved, the real-time optical fiber line loss monitoring can be realized, and the danger of burning the optical fiber end face due to unclean optical fiber end face is avoided.
Based on the above embodiment, a remote pump pumping source device with OTDR function, the laser unit includes several lasers; when the laser unit is in an OTDR state, the first optical signal is an OTDR pulse signal; the processing unit controls a corresponding laser in the laser unit to send out an OTDR pulse signal based on a preset OTDR rule; when the laser unit is in a remote pump state, the first optical signal is a pump optical signal; the processing unit controls one or more corresponding lasers in the laser unit to emit pump light signals based on a preset pumping rule.
Specifically, the laser unit includes a plurality of lasers, the number of the lasers can be adjusted according to specific application scenarios and application requirements, and the number and specification of the lasers in the laser unit are not specifically limited in the embodiments of the present invention. It should be noted that, when the laser unit is in the OTDR state, the processing unit controls one laser in the laser unit to emit an OTDR pulse signal, and the other lasers in the laser unit are in the off state, and when the laser unit is in the remote pump state, the processing unit controls one or more lasers in the laser unit to emit a pump light signal, that is, the OTDR pulse signal is an optical signal emitted by only one laser, and the pump light signal may be an optical signal emitted by several lasers and then combined.
Here, the preset OTDR rule is used to set a laser in the laser unit for transmitting the OTDR pulse signal, and can also be used to set a pulse amplitude of the transmitted OTDR pulse signal. In addition, the preset OTDR rule may also be used to set a pulse width, a sampling frequency, and the like of the transmitted OTDR pulse signal, which is not specifically limited in this embodiment of the present invention. The number of lasers emitting pump optical signals under a remote pump state can be determined according to practical application scenes and application requirements, and the wavelength and the power of the optical signals emitted by each laser need to be determined based on preset pumping rules.
Based on any of the above embodiments, a remote pump source device with OTDR function, the laser unit further includes a plurality of polarization multiplexers and/or a plurality of wavelength division multiplexers; the polarization multiplexer is used for multiplexing the pump light signals emitted by the plurality of lasers, and the wavelength division multiplexer is used for multiplexing the pump light signals with different wavelengths.
Specifically, in a remote pump state, the processing unit controls one or more corresponding lasers in the laser unit to emit pump light signals based on a preset pumping rule. When the processing unit controls a plurality of lasers in the laser unit to simultaneously send out pump light signals, and the pump light signals sent out by the plurality of lasers are multiplexed through the polarization multiplexer and/or the wavelength division multiplexer.
The Polarization Division Multiplexing (PDM) technique not only can improve the communication capacity of the system to a great extent, but also can significantly improve the spectral efficiency of the system while realizing that multiple beams of optical signals with the same or different wavelengths are independently propagated in the same optical fiber. Wavelength Division Multiplexing (WDM) technology can combine optical signals with different wavelengths and couple the optical signals to the same optical fiber of an optical line for transmission.
Based on any of the embodiments, in a remote pump source device with an OTDR function, when a laser unit is in an OTDR state, a second optical signal is a reflected/scattered optical signal generated by fresnel reflection or rayleigh scattering; the processing unit acquires an OTDR detection result of an optical fiber link to be detected connected with the output optical fiber based on the size of the OTDR pulse signal, the sending time, the size of the reflected/scattered optical signal and the receiving time; and if the OTDR detection result meets the preset pump starting condition, the processing unit controls the laser unit to be switched to a remote pump state.
Here, the fresnel reflection originates from an abrupt change in the refractive index, so that the reflected signal received on the basis of the fresnel reflection counteracts abrupt changes in the optical fiber, such as fiber breaks, mechanical connections, etc. Rayleigh scattering refers to the transmission of OTDR pulse signals in optical fiber, and due to the scattering characteristics of the optical fiber itself, very weak backscattered signals will return to the circulator. The intensity of the scattered signal received based on rayleigh scattering reflects the attenuation characteristics of the optical fiber.
The OTDR detection result of the optical fiber link to be detected connected to the output optical fiber may include the condition of the end face of the optical fiber to be detected, the length, loss, attenuation, and fault location of the link, which is not specifically limited in this embodiment of the present invention. And after obtaining the OTDR detection result, judging whether the OTDR detection result meets a preset pump starting condition, and if the OTDR detection result meets the preset pump starting condition, controlling the laser unit to be switched to a remote pump state by the processing unit.
Here, the preset pump-on condition may be that the end surface of the optical fiber to be detected is clean and the link is in a normal state, or may be an interval of a detection result corresponding to the optical fiber link to be detected in the normal state, and if the OTDR detection result is in the interval of the detection result corresponding to the normal state, the OTDR detection result is considered to satisfy the preset pump-on condition. Or, the preset pump-on condition is a threshold of each parameter in the detection result, and whether the OTDR detection result meets the preset pump-on condition can be judged through each parameter threshold.
Based on any of the above embodiments, in a remote pump pumping source device with an OTDR function, when a laser unit is in a remote pump state, a second optical signal is a reflected optical signal; and if the reflected light signal is greater than the preset reflection threshold, the processing unit controls the laser unit to be switched to an OTDR state.
In particular, in the remote pump state, the signal quality of the pump output end facet and the fiber link is typically determined based on the magnitude of the reflected optical signal. And if the reflected light signal is greater than the preset reflection threshold value, confirming that the optical fiber link connected with the output optical fiber at present has a fault or the end face is not clean, controlling the laser unit to be switched to an OTDR state through the processing unit, carrying out fault detection on the optical fiber link connected with the output optical fiber at present, giving an OTDR detection result, and reporting the information on a network manager so that maintenance personnel can go to the site to repair the optical fiber link in time.
If the reflected light signal is less than or equal to the preset reflection threshold value, the state of the optical fiber link connected with the output optical fiber at present is confirmed to be normal, and the processing unit controls the laser unit to be kept in a remote pump state.
In the embodiment of the invention, the signal quality of the current end face and the link is obtained through the reflected light signals in the remote pump state, and the OTDR mode is switched to when the end face is not clean or the link possibly has problems, so that the danger of burning the end face of the optical fiber due to the unclean end face is avoided.
Based on any one of the embodiments, a remote pump pumping source device with OTDR function, the processing unit includes a photoelectric detector; the photodetector is used for converting the second optical signal into an electrical signal.
Specifically, the second optical signal is transmitted to the processing unit through the circulator, the processing unit is firstly converted into an electrical signal through the photoelectric detector, and then the processing unit judges whether the working state of the laser unit needs to be switched or not according to the electrical signal.
Further, the processing unit performs analog-to-digital conversion on the electric signal to obtain a digital signal, and then processes the digital signal to judge whether the working state of the laser unit needs to be switched.
Based on any of the embodiments described above, in a remote pump source apparatus with an OTDR function, when a laser unit is in a remote pump state, the first optical signal is a pump optical signal including at least one wavelength.
For example, fig. 2 is a schematic structural diagram of a first-order remote pump source apparatus with an OTDR function according to an embodiment of the present invention, and as shown in fig. 2, a laser unit includes four lasers, each laser is configured to emit pump light of 14xx nm, and the pump light emitted by different lasers is combined by a Wavelength Division Multiplexer (WDM) and then output through a circulator.
Fig. 3 is a schematic structural diagram of a second-order remote pump source apparatus with an OTDR function according to an embodiment of the present invention, and in the remote pump source apparatus shown in fig. 3, a laser unit includes two groups of pump groups, where a 14xx pump group includes a plurality of lasers for emitting pump light of 14xx nm, a 13xx pump group includes a plurality of lasers for emitting pump light of 13xx nm, and the pump light of 14xx nm emitted by the 14xx pump group and the pump light of 13xx nm emitted by the 13xx pump group are combined by a Wavelength Division Multiplexer (WDM) and then output through a circulator. Fig. 4 is a schematic structural diagram of a three-stage remote pump source apparatus with OTDR function according to an embodiment of the present invention, and as shown in fig. 4, a laser unit includes three pump groups, where a 14xx pump group includes a plurality of lasers for emitting pump light at 14xx nm, a 13xx pump group includes a plurality of lasers for emitting pump light at 13xx nm, a 12xx pump group includes a plurality of lasers for emitting pump light at 12xx nm, the 14xx pump group emits pump light at 14xx nm, the 13xx pump group emits pump light at 13xx nm, and the 12xx pump group emits pump light at 12xx nm, which are combined by a Wavelength Division Multiplexer (WDM) and output via a WDM circulator.
Based on any of the above method embodiments, fig. 5 is a schematic flow diagram of a method for controlling a remote pump source with an OTDR function according to an embodiment of the present invention, and as shown in fig. 5, a method for controlling a remote pump source with an OTDR function includes:
501, the processing unit controls the laser unit to send out a first optical signal to the circulator and then transmit the first optical signal to the output optical fiber.
Specifically, the laser unit has two operating states, namely an OTDR state and a remote pump state. The first signal light in the OTDR state is an OTDR pulse signal, and the first signal light in the remote pump state is a pump light signal.
When the laser unit is in the OTDR state, the first signal light emitted by the laser unit is an OTDR pulse signal, the OTDR pulse signal is transmitted to the circulator through the optical fiber, and the circulator transmits the OTDR pulse signal to the output optical fiber, where the output optical fiber is an optical fiber connected to the remote pump pumping source device having the OTDR function in the embodiment of the present invention, so that the OTDR pulse signal can be transmitted in an optical fiber link to be tested to which the output optical fiber is connected.
When the laser unit is in a remote pump state, first signal light emitted by the laser unit is a pump light signal, the pump light signal is transmitted to the circulator through the optical fiber, the circulator transmits the pump light signal to the output optical fiber, and the output optical fiber is the optical fiber connected with the remote pump pumping source device with the OTDR function in the embodiment of the invention, so that the pump light signal can be transmitted in an optical fiber link to be tested connected with the output optical fiber, and the erbium-doped optical fiber is excited to amplify the signal.
And 502, the processing unit receives a second optical signal returned by the output optical fiber transmitted by the circulator.
Specifically, when the laser unit is in the OTDR state, the second signal light is a reflected/scattered light signal generated based on fresnel reflection or rayleigh scattering. The output fiber transmits the returned second signal light, i.e., the reflected/scattered light signal generated based on fresnel reflection or rayleigh scattering, to the circulator, which transmits the reflected/scattered light signal to the processing unit, and the processing unit receives the reflected/scattered light signal.
When the laser unit is in a remote pump state, the second signal light is a reflected light signal of the pump light signal. The output optical fiber transmits the returned second signal light, namely the reflected light signal of the pump light signal in a remote pump state to the circulator, the circulator transmits the reflected light signal to the processing unit, and the processing unit receives the reflected light signal.
503, the processing unit controls the working state of the laser unit according to the second optical signal, where the working state includes an OTDR state and a remote pump state.
Specifically, when the laser unit is in the OTDR state, the processing unit determines whether to switch the working state of the laser unit to a remote pump state according to the received reflected/scattered light signal; when the laser unit is in a remote pump state, the processing unit judges whether the working state of the laser unit is switched to an OTDR state according to the received reflected light signal.
In the embodiment of the invention, the OTDR and the remote pump function are realized by the same laser unit, so that the high OTDR equipment cost is saved, the problems of time and labor waste of field detection of engineering personnel are solved, the real-time optical fiber line loss monitoring can be realized, and the danger of burning the optical fiber end face due to unclean optical fiber end face is avoided.
Based on any of the above embodiments, a method for controlling a remote pump source with an OTDR function includes the following steps: when the laser unit is in an OTDR state, the first optical signal is an OTDR pulse signal; the processing unit controls a corresponding laser in the laser unit to send out an OTDR pulse signal based on a preset OTDR rule; when the laser unit is in a remote pump state, the first optical signal is a pump optical signal; the processing unit controls one or more corresponding lasers in the laser unit to emit pump light signals based on a preset pumping rule.
Specifically, the laser unit includes a plurality of lasers, the number of the lasers can be adjusted according to specific application scenarios and application requirements, and the number and specification of the lasers in the laser unit are not specifically limited in the embodiments of the present invention. It should be noted that the OTDR pulse signal is an optical signal emitted by only one laser, and the pump optical signal may be an optical signal that is generated by several lasers and then multiplexed.
Here, the preset OTDR rule is used to set a laser in the laser unit for transmitting the OTDR pulse signal, and can also be used to set a pulse amplitude of the transmitted OTDR pulse signal. In addition, the preset OTDR rule may also be used to set a pulse width, a sampling frequency, and the like of the transmitted OTDR pulse signal, which is not specifically limited in this embodiment of the present invention. The number of lasers emitting pump optical signals under a remote pump state can be determined according to practical application scenes and application requirements, and the wavelength and the power of the optical signals emitted by each laser need to be determined based on preset pumping rules.
Based on any of the above embodiments, a method for controlling a remote pump source with an OTDR function includes, in step 503: when the laser unit is in an OTDR state, the second optical signal is a reflected/scattered optical signal generated by Fresnel reflection or Rayleigh scattering; the processing unit acquires an OTDR detection result of an optical fiber link to be detected connected with the output optical fiber based on the size of the OTDR pulse signal, the sending time, the size of the reflected/scattered optical signal and the receiving time; and if the OTDR detection result meets the preset pump starting condition, the processing unit controls the laser unit to be switched to a remote pump state.
Here, the fresnel reflection originates from an abrupt change in the refractive index, so that the reflected signal received on the basis of the fresnel reflection counteracts abrupt changes in the optical fiber, such as fiber breaks, mechanical connections, etc. Rayleigh scattering refers to the transmission of OTDR pulse signals in optical fiber, and due to the scattering characteristics of the optical fiber itself, very weak backscattered signals will return to the circulator. The intensity of the scattered signal received based on rayleigh scattering reflects the attenuation characteristics of the optical fiber.
The OTDR detection result of the optical fiber link to be detected connected to the output optical fiber may include length, loss, attenuation, and fault location of the optical fiber link to be detected, which is not specifically limited in this embodiment of the present invention. And after obtaining the OTDR detection result, judging whether the OTDR detection result meets a preset pump starting condition, and if the OTDR detection result meets the preset pump starting condition, controlling the laser unit to be switched to a remote pump state by the processing unit.
Here, the preset pump-on condition may be an interval of a detection result corresponding to the optical fiber link to be detected in a normal state, and if the OTDR detection result is in the interval of the detection result corresponding to the normal state, the OTDR detection result is considered to satisfy the preset pump-on condition. Or, the preset pump-on condition is a threshold of each parameter in the detection result, and whether the OTDR detection result meets the preset pump-on condition can be judged through each parameter threshold.
Based on any of the above embodiments, a method for controlling a remote pump source with an OTDR function, step 503 further includes: when the laser unit is in a remote pump state, the second optical signal is a reflected optical signal; and if the reflected light signal is greater than the preset reflection threshold, the processing unit controls the laser unit to be switched to an OTDR state.
Specifically, if the reflected light signal is greater than the preset reflection threshold, it is determined that a fault exists in the optical fiber link currently connected with the output optical fiber, the processing unit controls the laser unit to switch to the OTDR state, and fault detection is performed on the optical fiber link currently connected with the output optical fiber.
If the reflected light signal is less than or equal to the preset reflection threshold value, the state of the optical fiber link connected with the output optical fiber at present is confirmed to be normal, and the processing unit controls the laser unit to be kept in a remote pump state.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the embodiments of the present invention, and are not limited thereto; although embodiments of the present invention have been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A remote pump pumping source device with OTDR function is characterized by comprising a laser unit, a circulator and a processing unit;
wherein the laser unit is respectively connected with the circulator and the processing unit;
the circulator is used for transmitting a first optical signal emitted by the laser unit to an output optical fiber and transmitting a second optical signal returned by the output optical fiber to the processing unit;
the processing unit is used for controlling the working state of the laser unit according to the second optical signal, wherein the working state comprises an OTDR state and a remote pump state;
the laser unit comprises a plurality of lasers;
when the laser unit is in the OTDR state, the first optical signal is an OTDR pulse signal; the processing unit controls a corresponding laser in the laser unit to send out the OTDR pulse signal based on a preset OTDR rule;
when the laser unit is in the OTDR state, the second optical signal is a reflected/scattered optical signal generated by fresnel reflection or rayleigh scattering;
the processing unit acquires an OTDR detection result of a fiber link to be detected connected with the output fiber based on the magnitude and the sending time of the OTDR pulse signal and the magnitude and the receiving time of the reflected/scattered light signal;
and if the OTDR detection result meets the preset pump starting condition, the processing unit controls the laser unit to be switched to the remote pump state.
2. The apparatus of claim 1,
when the laser unit is in the remote pump state, the first optical signal is a pump optical signal; the processing unit controls one or more corresponding lasers in the laser unit to emit the pump light signals based on a preset pumping rule.
3. The apparatus according to claim 2, wherein the laser unit further comprises a number of polarization multiplexers and/or a number of wavelength division multiplexers;
the polarization multiplexer is used for multiplexing the pump light signals emitted by the plurality of lasers, and the wavelength division multiplexer is used for multiplexing the pump light signals with different wavelengths.
4. The apparatus of claim 2,
when the laser unit is in the remote pump state, the second optical signal is a reflected optical signal;
and if the reflected light signal is greater than a preset reflection threshold value, the processing unit controls the laser unit to be switched to the OTDR state.
5. The apparatus of claim 1, wherein the processing unit comprises a photodetector;
the photodetector is used for converting the second optical signal into an electrical signal.
6. The apparatus of claim 2, wherein the first optical signal is a pump optical signal comprising at least one wavelength when the laser unit is in the remote pumping state.
7. A method for controlling a remote pump source with an OTDR function is characterized by comprising the following steps:
controlling a laser unit to send a first optical signal to a circulator and then transmitting the first optical signal to an output optical fiber;
receiving a second optical signal returned by the output optical fiber transmitted by the circulator;
controlling the working state of the laser unit according to the second optical signal, wherein the working state comprises an OTDR state and a remote pump state;
the laser unit comprises a plurality of lasers;
correspondingly, the control laser unit sends out first optical signal and transmits to output fiber after the circulator, specifically includes:
when the laser unit is in the OTDR state, the first optical signal is an OTDR pulse signal; controlling a corresponding laser in the laser unit to send out the OTDR pulse signal to a circulator and then transmit the OTDR pulse signal to an output optical fiber based on a preset OTDR rule;
the controlling the working state of the laser unit according to the second optical signal specifically includes:
when the laser unit is in the OTDR state, the second optical signal is a reflected/scattered optical signal generated by fresnel reflection or rayleigh scattering; acquiring an OTDR detection result of a fiber link to be detected connected with the output fiber based on the magnitude and the sending time of the OTDR pulse signal and the magnitude and the receiving time of the reflected/scattered light signal; and if the OTDR detection result meets the preset pump starting condition, controlling the laser unit to be switched to the remote pump state.
8. The method of claim 7,
correspondingly, the control laser unit sends out first optical signal and transmits to output fiber after to the circulator, still includes:
when the laser unit is in the remote pump state, the first optical signal is a pump optical signal; and controlling one or more corresponding lasers in the laser units to send the pump light signals to the circulator and then transmit the pump light signals to an output optical fiber based on a preset pumping rule.
9. The method of claim 8, wherein controlling the operating state of the laser unit based on the second optical signal further comprises:
when the laser unit is in the remote pump state, the second optical signal is a reflected optical signal; and if the reflected light signal is greater than a preset reflection threshold value, controlling the laser unit to be switched to the OTDR state.
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| CN109286441A (en) * | 2018-11-26 | 2019-01-29 | 瑞斯康达科技发展股份有限公司 | A kind of fibre-optic transmission system (FOTS) and the method for information transmission |
| CN112838893B (en) * | 2020-12-22 | 2022-03-29 | 武汉光迅科技股份有限公司 | Remote pump system, pump unit in station and method for automatic fault location of remote pump system |
| CN112713931B (en) * | 2021-01-27 | 2022-03-11 | 武汉光迅科技股份有限公司 | OTDR equipment, optical time domain reflection detection method and storage medium |
| CN113285751B (en) * | 2021-03-24 | 2022-09-23 | 国网江苏省电力有限公司徐州供电分公司 | Optical fiber communication system and optical fiber line switching protection method |
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