CN113253389B - Attenuation adjusting method and variable optical attenuator - Google Patents
Attenuation adjusting method and variable optical attenuator Download PDFInfo
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- CN113253389B CN113253389B CN202010082535.3A CN202010082535A CN113253389B CN 113253389 B CN113253389 B CN 113253389B CN 202010082535 A CN202010082535 A CN 202010082535A CN 113253389 B CN113253389 B CN 113253389B
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- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/264—Optical coupling means with optical elements between opposed fibre ends which perform a function other than beam splitting
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Abstract
A variable optical attenuator and attenuation adjustment method, comprising: the variable optical attenuator acquires the adjustment information of the film coating element and the adjustment information of the attenuation sheet, wherein the adjustment information of the film coating element indicates a first target position of the film coating element to enable the combined wave signal to penetrate through a target sub-area of the film coating element, and the adjustment information of the attenuation sheet indicates a second target position of the attenuation sheet to enable the combined wave signal to penetrate through a target light-passing area of the attenuation sheet; the variable optical attenuator sends the adjustment information of the film coating element to the first driving device, and the first driving device adjusts the film coating element to a first target position according to the adjustment information of the film coating element; the variable optical attenuator sends the adjustment information of the attenuation sheet to the second driving device, and the second driving device adjusts the attenuation sheet to the second target position according to the adjustment information of the attenuation sheet. The variable optical attenuator provided by the invention can realize flexible adjustment of wavelength-dependent loss.
Description
Technical Field
The present application relates to the field of optical communication technologies, and in particular, to an attenuation adjusting method and a variable optical attenuator.
Background
A Variable Optical Attenuator (VOA) is a passive device that is used in a large number and very important in a Dense Wavelength Division Multiplexing (DWDM) Optical communication system, as shown in fig. 1, and is commonly used before an input port or after an output port of an Optical amplifier to perform power adjustment on a transmitted Optical signal, so as to dynamically control the attenuation degree of the Optical signal, which is an indispensable key device in an Optical network.
Wavelength Dependent Loss (WDL) is a key optical indicator of a VOA, and is used to represent the maximum difference of specific attenuation values corresponding to different wavelengths at a certain nominal attenuation value, for example, in the operating Wavelength range of the VOA, the nominal attenuation value is 10dB, the VOA has the maximum attenuation value a (unit dB) at Wavelength m, and the VOA has the minimum attenuation value B (unit dB) at Wavelength n, and then the WDL of the VOA is equal to a-B. One common requirement for applying VOAs to DWDM systems is that optical signals of different wavelengths have uniform attenuation when exiting the VOA, but the attenuation values of the wavelengths before entering the VOA have differences due to the fact that the optical gain pre-tilt does not match with the Stimulated Raman Scattering (SRS) of the optical fiber, or the wavelengths are dropped from a site without single-wave power adjustment after multi-span transmission. In the prior art, the purpose of optical power attenuation is achieved by adopting a transmission attenuation sheet, a Micro-electro-mechanical System (MEMS) reflection or light blocking technology, but the technologies control the smaller the WDL, the better the WDL (i.e. performing attenuation adjustment with small difference on optical signals with different wavelengths), and the WDL is fixed and unchanged, so that the flexible adjustment of single-wave power on a passing composite wave signal cannot be realized.
Therefore, how to realize flexible adjustment of WDL of VOA is a technical problem to be solved urgently.
Disclosure of Invention
The embodiment of the invention provides an attenuation adjusting method and a variable optical attenuator, which can realize flexible adjustment of Wavelength Dependent Loss (WDL) of a wave combination signal entering a VOA.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions. In a first aspect, the present application provides a method for adjusting attenuation of a variable optical attenuator, comprising:
the variable optical attenuator acquires adjustment information of a coated element and adjustment information of an attenuation sheet, wherein the adjustment information of the coated element indicates a first target position of the coated element, the combined wave signal is made to pass through a target sub-region of the coated element, the target sub-region is one of sub-regions with different adjustment slopes of a plurality of wavelength-dependent losses WDL (loss-related coefficients) included in the coated element, the adjustment information of the attenuation sheet indicates a second target position of the attenuation sheet, the combined wave signal is made to pass through a target light-passing region of the attenuation sheet, and the target light-passing region is one of a plurality of light-passing regions with different attenuation values included in the attenuation sheet;
the variable optical attenuator sends the adjustment information of the film coating element to a first driving device, and the first driving device adjusts the film coating element to the first target position according to the adjustment information of the film coating element;
and the variable optical attenuator sends the adjustment information of the attenuation sheet to a second driving device, and the second driving device adjusts the attenuation sheet to the second target position according to the adjustment information of the attenuation sheet.
In one possible implementation, the total attenuation value of the combined signal passing through the variable optical attenuator is equal to the sum of the attenuation value of the combined signal passing through the coated element and the attenuation value of the combined signal passing through the attenuator.
In another possible implementation, the sub-regions or sub-units of the filming element are arranged in order from small to large in the adjustment slope of the WDL.
In a possible implementation manner, after the calculation control unit generates the adjustment information of the coating element and the adjustment information of the attenuation sheet according to the external adjustment requirement, the calculation control unit sends the adjustment information of the coating element to the first driving device and simultaneously sends the adjustment information of the attenuation sheet to the second driving device.
In a possible implementation manner, the calculation control unit generates and sends the adjustment information of the film coating element to the first driving device according to the external adjustment requirement, and then the calculation control unit generates and sends the adjustment information of the attenuation sheet to the second driving device.
In one possible implementation, the adjustment information of the coating element, the sub-region or sub-unit through which the combined signal passes, and the adjustment slope of the WDL have a correspondence relationship, and the correspondence relationship is preset in the variable optical attenuator.
In one possible implementation, the method further includes: the first position sensor feeds back the position of the film coating element to the calculation control unit until the film coating element reaches a target position; and the second position sensor feeds back the position of the attenuation sheet to the calculation control unit until the attenuation sheet reaches a target position.
In one possible implementation, when the filming element includes a plurality of the sub-units different in adjustment slope of the WDL, the first driving device includes a plurality of relays connected one to the plurality of the sub-units for adjusting positions of the plurality of the sub-units according to the adjustment information of the filming element.
In one possible implementation manner, when the first driving device adjusts the positions of the plurality of sub-units of the film coating element, the combined wave signal does not pass through any one of the sub-units or at least one of the sub-units.
In a second aspect, the present application provides a variable optical attenuator with adjustable wavelength dependent loss, WDL, comprising: the surface of the coating element consists of a plurality of subareas with different WDL adjusting slopes; the attenuation sheet controls the light transmission quantity of the combined signal to ensure that the combined signal realizes specific power attenuation, and the attenuation values of different light transmission areas of the attenuation sheet on the combined signal are different; the calculation control unit is used for respectively calculating a WDL (combined wave) adjustment slope of the combined wave signal and an attenuation value of the attenuation sheet according to adjustment requirements, wherein the WDL adjustment slope is used for determining the sub-area through which the combined wave signal passes, and the attenuation value of the attenuation sheet is used for determining a light passing area of the attenuation sheet; the first driving device is connected with the film coating element and used for adjusting the position of the film coating element according to a first instruction of the calculation control unit so that the combined wave signal penetrates through one sub-area of the film coating element; and the second driving device is connected with the attenuation sheet and used for adjusting the position of the attenuation sheet according to a second instruction of the calculation control unit so as to enable the combined wave signal to pass through one light-transmitting area of the attenuation sheet.
In one possible implementation, the total attenuation of the combined signal passing through the variable optical attenuator is equal to the sum of the attenuation generated through the coated element and the attenuation generated through the attenuation sheet.
In one possible implementation, the WDL adjustment slopes of the sub-zones of the filming element are arranged in order from small to large.
In another possible implementation manner, the calculation control unit is further configured to send the first instruction to a first driving device, where the first instruction includes adjustment information of the coating element; and simultaneously sending the second instruction to the second driving device, wherein the second instruction comprises the adjustment information of the attenuation sheet.
In one possible implementation manner, the adjustment information of the coating element, the sub-region through which the combined signal passes, and the WDL adjustment slope are in one-to-one correspondence, and the correspondence is preset in the variable optical attenuator.
In one possible implementation, the variable optical attenuator further includes: the first position sensor is connected with the film coating element and used for feeding back the position of the film coating element to the calculation control unit; the second position sensor is connected with the attenuation sheet and used for feeding back the position of the attenuation sheet to the calculation control unit; the optical element is used for changing the optical path direction of the combined wave signal; a power supply device for supplying voltage to the first driving device and the second driving device; and the collimating device is used for performing power coupling on the combined wave signal.
In one possible implementation, the optical element is a mirror or a prism; the collimating device is a collimator or a combination of a contact pin and a collimating lens.
In a third aspect, the present application provides another variable optical attenuator with adjustable wavelength dependent loss WDL, comprising: the coating flat plate group is used for adjusting WDL of the variable optical attenuator and consists of a plurality of coating flat plates, and the WDL adjusting slope of each coating flat plate is different; the attenuation sheet controls the light transmission quantity of the combined signal to ensure that the combined signal realizes specific power attenuation, and the attenuation values of different light transmission areas of the attenuation sheet on the combined signal are different; the calculation control unit is used for respectively calculating a WDL (wavelength division multiplexing) adjustment slope of the combined wave signal and an attenuation value of the attenuation sheet according to adjustment requirements, wherein the WDL adjustment slope is used for determining the coating flat plate through which the combined wave signal passes, and the attenuation value of the attenuation sheet is used for determining a light passing area of the attenuation sheet; the driving device group comprises a plurality of relays and is used for adjusting the positions of the plurality of coating flat plates according to the first instruction group of the calculation control unit so that the wave combination signal penetrates through at least one of the plurality of coating flat plates; and the driving device is connected with the attenuation sheet and used for adjusting the position of the attenuation sheet according to a second instruction of the calculation control unit so that the combined wave signal passes through one light-transmitting area of the attenuation sheet.
In one possible implementation, the total attenuation of the combined signal passing through the variable optical attenuator is equal to the sum of the attenuation value generated through the coated flat plate set and the attenuation value generated through the attenuation sheet.
In a possible implementation manner, the calculation control unit is further configured to send the first instruction group to a driving device group, where the first instruction group includes adjustment information of the plurality of coating flat plates; and simultaneously sending the second instruction to the driving device, wherein the second instruction comprises the adjustment information of the attenuation sheet.
In one possible implementation manner, the adjustment information of the plurality of coating plates, the coating plate or the combination of the coating plates through which the combined wave signal passes, and the WDL adjustment slope are in one-to-one correspondence, and the correspondence is preset in the variable optical attenuator.
In another possible implementation, the variable optical attenuator further includes: the position sensor is connected with the attenuation sheet and used for feeding back the position of the attenuation sheet to the calculation control unit; the optical element is used for changing the optical path direction of the combined wave signal; the power supply device is used for supplying voltage to the driving device group and the driving device; and the collimating device is used for performing power coupling on the combined wave signal.
In another possible implementation, the optical element is a mirror or a prism; the collimating device is a collimator or a combination of a contact pin and a collimating lens.
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. It is obvious that the following figures reflect only some embodiments of the invention, and that other embodiments of the invention can be obtained by those skilled in the art without inventive exercise. And all such embodiments or implementations are within the scope of the present invention.
FIG. 1 is a schematic diagram of the application of VOA in DWDM system;
fig. 2 is a schematic diagram of an adjusted insertion loss spectrum of a VOA reflecting an application scenario of an embodiment of the present application;
FIG. 3 is a schematic diagram of a WDL tunable VOA architecture, which may be suitable for use in embodiments of the present application;
FIG. 4 is a schematic view of a WDL slide configuration suitable for use with embodiments of the present application;
FIG. 5 is a schematic view of a WDL adjustment curve corresponding to FIG. 4;
fig. 6 is a schematic view of a VOA serial adjustment process provided in an embodiment of the present application;
fig. 7 is a schematic view of a VOA parallel adjustment process according to an embodiment of the present disclosure;
fig. 8 is a schematic structural diagram of a VOA with adjustable WDL according to an embodiment of the present disclosure;
FIG. 9 is a schematic diagram of an alternative WDL tunable VOA configuration provided by an embodiment of the present application;
FIG. 10 is a schematic diagram of an alternative WDL tunable VOA configuration provided by an embodiment of the present application;
FIG. 11 is a schematic diagram of an alternative WDL tunable VOA configuration provided by an embodiment of the present application;
FIG. 12 is a schematic diagram of a surface structure of a prism applied in FIG. 11 according to an embodiment of the present disclosure;
FIG. 13 is a schematic diagram of an alternative WDL tunable VOA configuration provided by an embodiment of the present application;
fig. 14 is a schematic structural view of a relay and a plating flat plate set applied to fig. 13 according to an embodiment of the present disclosure;
figure 15 is a schematic diagram of a WDL adjustment profile for each of the panels of figure 13 according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clear, the present application will be further described in detail with reference to the accompanying drawings. The particular methods of operation in the method embodiments may also be applied to apparatus embodiments or system embodiments.
Fig. 2 shows a schematic diagram of the adjusted insertion loss spectrum of a VOA. As shown in fig. 2, a straight line (r) is a power spectrum of an optical signal before entering the VOA, and simulates a scene in which an optical pre-tilt is not matched with the optical fiber SAS, and in the scene, a long-wave power value is greater than a short-wave power (or a long-wave insertion loss value is less than a short-wave insertion loss value); the straight line II is the power spectrum after the VOA is output, and the power values of all wavelengths should be consistent when the VOA is output under the ideal condition; the line (c) is derived from the difference between the line (1) and the line (2) and represents the adjusted insertion loss spectrum of the VOA, wherein the difference between the insertion loss value of the longest wavelength and the insertion loss value of the shortest wavelength in the wavelength range is the WDL of the VOA.
It should be noted that, in the existing implementation technology of VOAs, it is better to design a WDL as small as possible, and the insertion loss spectrum of the VOA approaches a straight line with a slope of 0, that is, insertion loss values of different wavelengths passing through the VOA are almost the same, and the WDL is fixed and unchanged, so that flexible adjustment of single-wave power of a passing composite wave signal cannot be realized.
Fig. 3 is a schematic diagram of a WDL tunable VOA structure applicable to an embodiment of the present application, and as shown in fig. 3, the WDL tunable VOA may include a WDL slide, an attenuation plate, a motor 1, a motor 2, a first position sensor, a second position sensor, and a calculation control unit.
Wherein, the WDL glass slide has an upper surface and a lower surface, the upper surface is plated with a WDL combined film, and the lower surface is plated with an antireflection film. The upper surface of the WDL comprises a plurality of areas, and except the default area plated with an antireflection film, each of the other areas is plated with an insertion loss film with different WDL values, so that the WDL is used for flexibly adjusting the single-wave power of the passing combined wave signal. Specifically, when the combined wave signal enters the VOA, the combined wave signal is selectively passed through one of the areas of the WDL slide by the linkage and cooperation of the motor 1 and the first position sensor, so as to flexibly compensate for the power difference between the long and short single waves in the combined wave signal.
As an example, fig. 4 illustrates a WDL slide structure that may be suitable for use with embodiments of the present application. As shown in FIG. 4, the surface of the WDL-plated composite film is divided into 2m +1 sub-regions, m is an integer of 0 or more, m isThe value is determined by the WDL adjusting range and the precision. And when the WDL adjustment range is determined and the adjustment precision is higher, or when the adjustment precision is determined and the adjustment range of the WDL is larger, the value of m is larger. In fig. 4, m is 3, the surface of the WDL slide is divided into 7 sub-regions, each of the coated sub-regions may be divided into equal widths or divided into unequal widths, but the length a and the width b of each sub-region need to be matched with the spot size of the optical signal passing through, so as to avoid introducing extra loss. A sub-region is reserved in 2m +1 sub-regions on the WDL slide and is plated with an antireflection film, the sub-region is a default region and is in a light spot punch-through initial state, and the insertion loss values of a long wave signal and a short wave signal are the same when a combined wave signal passes through the VOA in the light spot initial state, for example, the insertion loss values are both 0; the other 2m sub-areas are respectively plated with insertion films with different WDL values, and the combined wave signals can be selected to pass through the corresponding sub-areas according to the difference of the WDL values to be adjusted, so that the requirement of flexibly compensating the power difference of the long and short wave signals in the combined wave signals is met. FIG. 5 is a schematic view of a WDL adjustment curve corresponding to FIG. 4, consisting of 2m +1 lines of different slopes. In fig. 5, WDL ═ ILLong and long-ILShort lengthI, slope k ═ ILLong and long-ILShort length)/(λLong and long-λShort length) Wherein IL represents Insertion Loss (Insertion Loss), ILLong and longFor long-wave insertion loss value, ILShort lengthThe slope k has positive and negative components for short-wave insertion loss value, and if the long-wave insertion loss value IL is obtained after the combined wave signal passes through WDL glass slideLong and longGreater than the short-wave insertion loss value ILShort lengthIf so, k is greater than 0, if the long-wave insertion loss value IL isLong and longLess than the short-wave insertion loss value ILShort lengthIf so, k is less than 0. The straight line (i) is a WDL curve of the combined wave signal passing through the default region, and the slope of the curve is 0, which indicates that the insertion loss values of the long wave signal and the short wave signal in the combined wave signal passing through the default region are the same, and the same insertion loss value may be designed as 0, or as other suitable values. Straight lines from the second to the fourth are WDL curves of the combined wave signal passing through a left area 1, a left area 2 and a left area 3 on the left of the default area, the slope k of the WDL curves is larger than 0, and the WDL curves indicate that the insertion loss value of the long wave signal is larger than that of the short wave signal when the combined wave signal passes through a sub-area on the left of the default area; dotted lines of the fifth to seventh color are the combined wave signal passing through the right 1, right 2 and right 3 regions of the default regionAnd the slope k of the WDL curve is less than 0, and represents that the insertion loss value of the long wave signal is less than that of the short wave signal when the combined wave signal passes through the sub-area on the right side of the default area.
Alternatively, the positions of 2m +1 sub-regions can be freely set, and the numbers of k greater than 0 and k less than 0 in the prefabricated 2m WDL films can be freely selected and distributed, and fig. 4 is only one implementation.
As an example, the WDL coating sub-areas are sequentially arranged according to the WDL value or the WDL adjustment slope from small to large, so that the serious degradation influence on the system performance in the adjustment process in a partial scene can be avoided, and the stability of the system can be ensured.
And the attenuation sheet is used for realizing that the total attenuation of the composite wave signal passing through the VOA is continuously adjustable. It should be noted that the total attenuation value of the combined wave signal through the VOA is equal to the sum of the corresponding insertion loss value and the attenuation sheet adjustment value generated by the sub-region adjustment value of the WDL slide, so that the attenuation value of the attenuation sheet can be calculated on the premise that the total attenuation value and the WDL to be adjusted are known, and the total attenuation value can be kept unchanged by adjusting the attenuation value of the attenuation sheet.
And the motor 1 is used for driving the WDL slide to displace so that the composite wave signal penetrates through the target sub-region.
And the motor 2 is used for driving the attenuation sheet to displace so as to generate a required attenuation value when the combined wave signal passes through the attenuation sheet.
The first position sensor is connected with the WDL slide and used for feeding back the real-time position of the WDL slide;
and the second position sensor is connected with the attenuation sheet and used for feeding back the real-time position of the attenuation sheet.
A calculation control unit: receiving an external adjusting requirement, and calculating an insertion loss value required to be generated by a WDL slide and an attenuation value required to be generated by an attenuation sheet according to the adjusting requirement, wherein the adjusting requirement comprises a WDL value required to be adjusted and a total attenuation value; sending adjusting commands to a motor 1 and a motor 2 respectively, wherein the motor 1 drives a WDL slide to move according to the adjusting commands, and a first position sensor feeds back the position of the WDL slide in real time until the first position sensor is ensured to move to a target position S1; the motor 2 drives the damping plate to move to D1 according to the regulating command, and the second position sensor feeds back the position of the damping plate until it is ensured that it has moved to D1.
Optionally, the optical path of the VOA structure shown in this embodiment is reversible. As an example, the optical signal may pass through IN-attenuator-WDL slide-OUT IN sequence, as shown IN fig. 3; as another example, the optical signal may also pass through the IN-WDL slide-attenuator-OUT IN sequence.
Fig. 6 is a schematic view of a VOA serial adjustment process according to an embodiment of the present disclosure. The process comprises the following steps:
s600: the calculation control unit receives an external regulation demand.
The external regulation requirement can be input through a network management side and comprises WDL and a total attenuation value of the combined wave signal to be regulated. As an example, the WDL of the combined wave signal which needs to be compensated through the VOA is 1dB, and the total attenuation needs to be achieved at the same time, so the adjustment requirement of the input at the network management side is WDL being 1dB, and the total attenuation value being 2 dB.
For example, the compensation value of the combined wave signal in the full wave state with the working wavelength of 1525 to 1575nm realized by the VOA in this embodiment is 1dB, and the compensation value may include a wavelength power difference generated due to the mismatch between the optical amplifier gain pretilt and the SRS, or due to the station down wave without single-wave power adjustment after multi-span transmission. And the calculation control unit receives the adjustment requirement sent by the network management side as WDL (wavelength division multiplexing) 1dB and the total attenuation value as 2dB, wherein the WDL is the wavelength power difference required to be compensated by the combined wave signal.
S601: the calculation control unit generates and sends a first command to the electric machine 1 according to the WDL adjustment requirement.
In the present embodiment, the motor 1 may also be referred to as a first driving device for adjusting the position of the WDL slide. The calculation control unit receives an external regulation demand, wherein the regulation demand can comprise a WDL regulation demand and a total attenuation value regulation demand, the calculation control unit regulates the WDL slide to a target position by sending a control command to the motor 1 according to the WDL regulation demand, and the sum of an attenuation value generated by a wave combination signal passing through the WDL slide correspondingly and an attenuation value generated by an attenuation sheet is equal to the total attenuation value. Specifically, the calculation control unit calculates an adjustment value of the WDL slide according to the WDL adjustment demand, generates and transmits a first instruction containing adjustment value information to the motor 1, the first instruction being for instructing the motor 1 to adjust the WDL slide to a target position in accordance with the adjustment value, wherein the motor 1 can obtain a voltage supply by the power supply device.
As an example, according to the aforementioned compensation requirement of 1dB, the adjustment requirement received by the calculation control unit is WDL 1dB, and WDL/(λ) is calculated according to the formula k for calculating the slopeIs long and long-λShort length) The slope k was calculated to be 0.02 dB/nm. The calculation control unit obtains an adjustment value S1 of the WDL slide from a table (e.g., table 1) of the adjustment value and the slope of the WDL slide, and then generates and transmits a first command containing the adjustment value to the motor 1. The adjustment value is a position adjustment value of a WDL slide, and is used to adjust the position of the WDL slide so that the combined wave signal passes through a target sub-region of the WDL slide. It will be appreciated that if the motor 1 is not able to directly identify the adjustment value, the calculation control unit will generally convert the adjustment value into information that the motor can identify. For example, the calculation control unit converts the adjustment value into pulse information, generates a first command containing the pulse information, and sends the first command to the motor 1.
Note that the adjustment value of the WDL slide corresponds to the sub-area of the composite wave signal passing through the WDL slide one by one, and as an example, table 1 is a possible corresponding manner.
TABLE 1
| Adjustment value of WDL slide | Sub-area through which composite wave signal passes | Slope of WDL | |
| S1 | Left | ||
| 4 region | k1 | ||
| S2 | Zone 3 of left | k2 | |
| S3 | Zone 2 of left | k3 | |
| S4 | Region 1 on the left | k4 | |
| | Default zone | 0 | |
| | Region | 1 on the right | k5 |
| S6 | Zone 2 on the right | k6 | |
| S7 | Region 3 on the right | k7 | |
| S8 | Right 4 region | k8 |
In the slope of the WDL curve, k is1～k4Greater than 0, k5～k8Less than 0, and k1～k4Decrease in order, k5～k8And the number of the adjustment processes is reduced in turn, so that the serious degradation influence on the system performance caused by the adjustment process under partial scenes can be avoided.
It should be further noted that the above-mentioned corresponding manner is only one possible implementation manner, and it should be understood that the arrangement order of the sub-regions in the WDL slide may be changed appropriately, the preset slope of the WDL curve of each sub-region may also be changed appropriately according to the WDL adjustment range and the adjustment precision, and the corresponding relationship between the adjustment value of the WDL slide and the sub-region is changed accordingly. In addition, the corresponding relation between the adjustment value of the WDL slide and the sub-region of the wave combination signal passing through the WDL slide and the preset slope of the WDL curve of each sub-region can be set and completed before the VOA leaves the factory.
S602: the motor 1 adjusts the WDL slide to a target position according to the first instruction.
In this embodiment, the WDL slide and the first position sensor are connected in sequence to the calculation control unit, and when the motor 1 is driven to adjust the position of the WDL slide, the first position sensor feeds back the position information of the WDL slide to the calculation control unit in real time until the WDL slide is adjusted to a preset target position.
It should be noted that there is a certain correspondence between the position of the WDL slide and the adjustment value, and this certain correspondence may be preset before shipping the VOA. The position of the WDL slide is fed back in real time by the first position sensor to the calculation control unit.
As an example, the adjustment of the position of the WDL slide may be performed by one movable brush, and the motor 1 changes the position of the movable brush so that the light passing position of the WDL slide; as another example, the adjustment of the WDL slide may be achieved by a slide rheostat, and the motor 1 changes the resistance value of the slide rheostat by changing the position of the slide sheet, thereby adjusting the light passing position of the WDL slide; the first position sensor feeds back its current position to the calculation control unit in real time during position adjustment of the WDL slide until the WDL slide is adjusted to the target position.
S603: the calculation control unit calculates the attenuation value of the composite wave signal generated by passing through the WDL slide, and calculates the attenuation value of the composite wave signal passing through the attenuation sheet according to the total attenuation value.
In this embodiment, the total attenuation value of the combined wave signal passing through the VOA is equal to the sum of the attenuation value of the combined wave signal passing through the WDL slide and the attenuation value of the combined wave signal passing through the attenuation sheet, wherein the attenuation value of the combined wave signal passing through the WDL slide can be calculated by a formula.
It should be noted that, the calculation formula can be obtained by an inductive test method to calculate the attenuation value generated by the composite wave signal passing through the WDL slide, and the attenuation value a generated by the composite wave signal passing through the WDL slide is 0.48 × WDL | + 0.01. It should be understood that the above formula is only one possible example, and in fact, the approximate value of the attenuation value generated by the composite wave signal passing through the WDL slide can be obtained through the above calculation formula; in addition, as the number of the induction samples increases and the calculation accuracy improves, the above formula can be improved and developed into other forms, which is not limited in this embodiment.
As an example, the attenuation value generated by the composite wave signal passing through the WDL slide is a, which is obtained by the above formula, and the calculation control unit calculates the attenuation value to be adjusted of the attenuation sheet from the total attenuation value b, which is b-a, and is denoted by d in this embodiment, that is, d is b-a.
S604: the calculation control unit generates and sends a second command to the motor 2 according to the calculation result.
In this embodiment, the motor 2 may also be referred to as a second drive for adjusting the position of the damping fin. The calculation control unit finds a corresponding adjusting value of the position of the attenuation sheet according to the calculated attenuation value of the combined wave signal which the attenuation sheet needs to reach, generates and sends a second instruction containing adjusting value information to the motor 2, the second instruction is used for instructing the motor 2 to adjust the attenuation sheet to the target position according to the adjusting value information, and the motor 2 can obtain voltage supply through a power supply device.
As an example, the calculation control unit finds the adjustment value D1 of the damping strip according to the correspondence shown in table 2, generates and sends a second command containing adjustment information to the motor 2, the second command being used to instruct the motor 2 to adjust the damping strip to the target position. It will be appreciated that if the motor 2 cannot directly identify the adjustment value, the calculation control unit will generally convert the adjustment value into information that the motor can identify. For example, the calculation control unit converts the adjustment value into pulse information, and generates a first command containing the pulse information to send to the motor 2, so that the adjustment value information in this embodiment does not represent only the adjustment value, but is a generic term of the adjustment value and its conversion information.
Note that, the adjustment value of the attenuation piece corresponds to the attenuation value generated by the composite signal, and as an example, table 2 is a possible correspondence method.
TABLE 2
In table 2, each adjustment value D corresponds to an attenuation value D generated by a composite signal. For example, the positions of the attenuation pieces are adjusted according to D1 to D5, and the combined wave signal passes through the attenuation value D corresponding to the attenuation pieces1～d5And sequentially increased.
It should be noted that the above-mentioned corresponding method is only one of all possible corresponding methods, and it should be understood that the magnitude of the attenuation value generated by the combined signal and the difference between adjacent attenuation values may be changed according to the range of the adjustment value of the attenuation sheet and the adjustment accuracy. In addition, the corresponding relation between the adjusting value of the attenuation sheet and the generated attenuation value can be set before the VOA leaves the factory.
S605: the motor 2 adjusts the attenuation sheet to the target position according to the second instruction.
In this embodiment, the attenuation sheet and the second position sensor are sequentially connected with the calculation control unit, and when the motor 2 is driven to adjust the position of the attenuation sheet, the second position sensor feeds back the position information of the attenuation sheet to the calculation control unit in real time until the attenuation sheet is adjusted to the preset target position.
It should be noted that there is a certain correspondence between the position of the attenuation pad and the adjustment value, and this certain correspondence may be preset before shipping the VOA. And the second position sensor feeds back the position of the attenuation sheet to the calculation control unit in real time according to the corresponding relation.
As an example, the position of the damping sheet can be adjusted by a movable brush, and the motor 2 changes the damping value of the damping sheet by changing the position of the movable brush; as another example, the adjustment of the damping sheet can be realized by a slide rheostat, and the motor 2 changes the resistance value of the slide rheostat by changing the position of the slide sheet, so as to change the damping value of the damping sheet; the second position sensor feeds back the current position of the attenuation sheet to the calculation control unit in real time in the position adjusting process of the attenuation sheet until the attenuation sheet is adjusted to the target position.
Fig. 7 is a schematic view of a VOA parallel adjustment process according to an embodiment of the present application. The process comprises the following steps:
s701: and the calculation control unit respectively calculates the adjustment values of the WDL slide and the attenuation sheet according to the adjustment requirements.
In the present embodiment, the calculation control unit first calculates the adjustment slope according to the WDL adjustment demand, and then finds the adjustment value of the WDL slide position according to the correspondence table between the slope and the adjustment value. And then, the calculation control unit calculates the attenuation value of the combined wave signal generated by passing through the sub-region corresponding to the WDL slide, and calculates the attenuation value of the combined wave signal passing through the attenuation sheet according to the total attenuation value requirement. And finally, finding out the adjusting value of the position of the attenuation sheet according to the corresponding relation table between the adjusting value of the attenuation sheet and the generated attenuation value.
The way of calculating the attenuation value of the composite wave signal passing through the WDL slide and the attenuation value passing through the attenuation sheet according to the adjustment requirement is the same as the way shown in the serial adjustment flowchart, and is not repeated in this embodiment.
S702: the calculation control unit sends a first instruction to the motor 1 and simultaneously sends a second instruction to the motor 2.
Wherein the first instruction contains position adjustment value information of the WDL slide, and the second instruction contains position adjustment value information of the attenuation sheet. The calculation control unit sends instructions to the motor 1 and the motor 2 at the same time, so as to ensure that synchronous adjustment of the WDL glass slide and the attenuation sheet is realized, which is also a difference between the serial adjustment shown in the embodiment and the serial adjustment shown in FIG. 6.
It should be understood that the motor 1 cannot directly recognize the adjustment value and move the position of the WDL slide in accordance with the adjustment value, and the calculation control unit generally converts the adjustment value into information that the motor can recognize. For example, the calculation control unit converts the adjustment value of the WDL slide position into pulse information, and generates a first instruction containing the pulse information to send to the motor 1. Likewise, the calculation control unit converts the adjustment value of the position of the damping strip into pulse information and generates a second command containing the pulse information to be sent to the motor 2. Therefore, the adjustment value information in this embodiment does not represent only the adjustment value, but is a general reference to the adjustment value and its conversion information.
S703: the motor 1 adjusts the WDL slide to the target position S according to the first instruction, while the motor 2 adjusts the attenuation sheet to the target position D according to the second instruction.
In this embodiment, the WDL slide and the first position sensor are sequentially connected to the calculation control unit, and when the motor 1 is driven to adjust the position of the WDL slide, the first position sensor feeds back the position information of the WDL slide to the calculation control unit in real time until the WDL slide is adjusted to the preset target position S. Similarly, the attenuation piece and the second position sensor are sequentially connected with the calculation control unit, and when the motor 2 is driven to adjust the position of the attenuation piece, the second position sensor feeds back the position information of the attenuation piece to the calculation control unit in real time until the attenuation piece is adjusted to the preset target position.
It should be noted that, when the position sensor is in operation, there is a certain correspondence between the position of the WDL slide and the adjustment value, and similarly, there is a certain correspondence between the position of the attenuation sheet and the adjustment value, and the two correspondences are usually different, and for the purpose of distinction, in this embodiment, the correspondence between the position of the WDL slide and the adjustment value is referred to as a first correspondence, and the correspondence between the position of the attenuation sheet and the adjustment value is referred to as a second correspondence; the above two determined correspondence relationships may be preset before shipping the VOA. And the position sensor respectively obtains and feeds back the positions of the WDL glass slide and the attenuation sheet to the calculation control unit in real time according to the two corresponding relations.
By the embodiment, synchronous adjustment can be realized by the WDL slide and the attenuation sheet, the implementation steps are simplified, and the adjustment time is saved. For details of the implementation in this embodiment, reference may be made to the foregoing embodiments, which are not described herein again.
Compared with the VOA in the prior art, the method has the advantages that the WDL curve is added in the optical path and passes through the uniquely designed coating element (WDL glass slide, coating prism or coating flat plate group), so that the linear adjustment of the WDL of the VOA can be realized, the power difference of the long and short waves in the through composite wave signal light can be reduced, and the power difference of the long and short waves in the passing composite wave signal light can be increased, so that the flexible requirements of the DWDM system on different transmission scenes can be met. Meanwhile, the calculation control unit is added in the existing VOA, so that the adjustment value of the WDL slide and the adjustment value of the attenuation sheet can be calculated respectively, the total attenuation of the optimized adjustment wave combination signal in the VOA after passing through the coating element is kept unchanged, the WDL and the attenuation value of the VOA can be adjusted in parallel, and the adjustment time is greatly shortened.
Based on the above method embodiments, several possible device configurations provided by the present application are described below. Fig. 8 is a schematic structural diagram of a VOA with adjustable WDL according to this embodiment. As shown in fig. 8, the combined wave signal enters from the input-end collimator, then is reflected by the mirror 1, then sequentially passes through the WDL glass sheet and the attenuation sheet, then is reflected by the mirror 2, enters the output-end collimator, and then is output. The input end collimator and the output end collimator may be single-core collimators or dual-core collimators, which is not limited in this embodiment.
The input end collimator and the output end collimator are composed of a contact pin and a collimating lens, the contact pin and the collimating lens are coaxial, and the center of the end face of the contact pin is located on the object focus of the collimating lens, so that signal light can be output by parallel light through the input end collimator. It should be understood that the parallel light from the output collimator can be focused and transmitted in the optical fiber to reduce the optical power loss.
As shown in fig. 8, the angles between the reflector 1 and the reflector 2 and the horizontal line are both 45 °, the angle between the two reflectors is 90 °, and the two reflectors may be the same reflector except for different placement positions and directions.
Optionally, the reflector 1 and the reflector 2 are both plated with a high-reflectivity metal film or a dielectric film, and the insertion loss of the high-reflectivity metal film or the dielectric film to the optical signal is small and generally less than 0.1 dB; the light-passing surface areas of the reflecting mirror 1 and the reflecting mirror 2 are larger than the size of an incident collimation light spot, so that the introduction of extra optical power loss can be avoided.
It should be noted that the WDL slide and the attenuation plate are independent from each other in the optical path structure, and the order of the WDL slide and the attenuation plate in the optical path can be changed, and this embodiment is described by taking only the order of the input collimator-mirror 1-WDL slide-attenuation plate-mirror 2-output collimator as an example. The WDL glass slide is used for flexibly adjusting the power difference between a long wave signal and a short wave signal in an input composite wave signal, and the attenuation sheet is used for flexibly adjusting the total attenuation of the input composite wave signal. The motor 1 is used for adjusting the position of the WDL glass slide, the motor 2 is used for adjusting the position of the attenuation sheet, and the power supply device supplies voltage to the motor 1 and the motor 2 for driving.
It should be noted that, in the VOA structure shown in this embodiment, WDL of the attenuation plate in the whole attenuation range is small, that is, the difference between the power attenuation values of the long-wave signal and the short-wave signal when the combined wave signal passes through the attenuation plate is small, WDL caused by the attenuation plate on the combined wave signal is negligible relative to WDL generated when the combined wave signal passes through the WDL glass plate, and therefore WDL generated by the WDL glass plate can be considered as WDL value of the whole VOA.
As one example, after the calculation control unit acquires the adjustment requirements of the WDL and the total attenuation value from the outside, the adjustment values of the WDL slide and the attenuation sheet are first calculated, respectively; then a first instruction containing WDL slide position adjustment valueSending the command to the motor 1, and sending a second command containing the attenuation sheet position adjusting value to the motor 2; thereafter, the motor 1 adjusts the WDL slide to the target position under the feedback of the first position sensor. For example, the calculation control unit receives external adjustment requirements to realize the compensation SRS of 1dB in the full wave state with the working wavelength of 1525-1575 nm, and the total attenuation value b is 3 dB. According to the compensation requirement, the calculation control unit calculates the WDL (1 dB) required to be adjusted by the VOA, and the formula k for calculating the slope is WDL/(lambda)Long and long-λShort length) The slope k was calculated to be 0.02 dB/nm. The calculation control unit obtains an adjustment value S1 of the WDL slide according to a corresponding table (for example, Table 1) of the adjustment value and the slope of the WDL slide; then, the attenuation value a generated when the combined wave signal passes through the WDL slide is calculated according to the formula a of 0.48 × WDL | +0.01, the attenuation value D required to be realized by the attenuation sheet is 3-0.49 of 2.51dB, and the calculation control unit obtains the adjustment value D1 of the attenuation sheet according to a correspondence table (for example, table 2) between the adjustment value of the attenuation sheet and the generated attenuation value. The calculation control unit converts the adjustment values S1 and D1 into pulse information M1 and M2, respectively, generates and transmits a first command including the pulse information M1 to the motor 1, and simultaneously generates and transmits a second command including the pulse information M2 to the motor 2. The motor 1 and the motor 2 respectively adjust the positions of the WDL slide and the attenuation sheet according to the pulse information, and the WDL slide and the attenuation sheet are adjusted to target positions under the feedback of the first position sensor and the second position sensor.
It should be noted that this embodiment may be implemented by parallel adjustment, that is, adjusting the positions of the WDL slide and the attenuation plate simultaneously, or by serial adjustment, where the positions of the WDL slide or the attenuation plate are adjusted first, and then the other is adjusted.
Fig. 9 is a schematic structural diagram of another WDL-adjustable VOA according to an embodiment of the present disclosure. The VOA provided in this embodiment is mainly different from the VOA structure shown in fig. 8 in that the input-side collimator and the output-side collimator in fig. 8 are replaced by two pins and a common collimating lens, where pin 1 is used for the combined-wave signal input and pin 2 is used for the combined-wave signal output. The centers of the front end faces of the two contact pins are arranged on the object space focal plane of the collimating lens.
The VOA shown in this embodiment includes three mirrors, where mirror 1 is used to reflect the signal light coming from pin 1 and also to reflect the attenuation-adjusted signal light back to pin 2 for output. It is understood that the light-passing range of the mirror 1 in the present embodiment is larger than the light-passing ranges of the two mirrors in fig. 8.
It should be noted that, because the center of the end face of the input pin 1 in this embodiment is not strictly placed at the focus of the collimating lens, the emergent light passing through the collimating lens is not distributed horizontally (the included angle with the horizontal line is 0 °) but has a certain included angle with the horizontal line, and it is assumed that the included angle between the emergent light passing through the collimating lens and the horizontal line is α. In order for the reflected light passing the mirror 1 to still pass perpendicularly through the optical surfaces of the WDL slide and the attenuation sheet, the mirror 1 will no longer assume an angle of 45 degrees to the horizontal, but there will be an angular difference of a/2. In addition, the reflecting mirror 3 is additionally arranged in the embodiment, and the reflecting mirror 3 is mainly used for turning the light path so as to realize that the output end and the input end share the collimating lens.
Fig. 10 is a schematic structural diagram of another WDL-adjustable VOA according to an embodiment of the present disclosure. The present embodiment provides a VOA which is mainly different from the VOA structure shown in fig. 8 in that the mirror 1 and the reflected light 2 are removed from the VOA in the present embodiment, the WDL slide is directly connected to the input-side collimator, and the attenuation sheet is directly connected to the output-side collimator. Since the combined use of the reflector 1 and the reflector 2 in fig. 8 is mainly used for folding the optical path, and the signal light input end and the signal light output end are output from the same side of the VOA, in this embodiment, after the two reflectors are removed, the signal light input end and the signal light output end of the VOA are output from the upper side and the lower side.
Alternatively, one of the two mirrors in fig. 8 may be retained in this embodiment, so that the signal light input end and the signal light output end of the VOA are also two-side output fibers. For example, the signal light input end is on the upper or lower side of the VOA shown in fig. 10, and the output end is on the right side of the VOA.
Fig. 11 is a schematic structural diagram of another WDL-adjustable VOA according to an embodiment of the present disclosure. In this embodiment, the VOA uses a set of prisms instead of the set of mirrors in fig. 8 to facilitate installation and fixation inside the VOA. Meanwhile, the VOA in this embodiment has no WDL glass sheet, and instead a corresponding WDL film is plated on the upper surface of the prism 2 or the lower surface of the prism 1.
The prism surface structure coated with WDL film is shown in fig. 12, and the prism shown in fig. 12 is exemplified by coating WDL film on the upper surface of the prism 2. The prism 2 may be a whole, for example, with a WDL film applied to the upper surface in sub-regions, the WDL film applied dividing the upper surface of the prism 2 into a plurality of sub-regions, each sub-region corresponding to a determined value of the WDL curve slope and a WDL position adjustment value, for example, as shown in table 1. Alternatively, the prism 2 may be a combination of several small prisms, each of which has an upper surface coated with a set of WDL films, and then a plurality of the small prisms are bonded together.
In this embodiment, the prism 2 is equivalent to the combination of the WDL glass plate and the mirror in the foregoing embodiments, and can not only realize adjustment of the WDL, but also reflect the optical path and change the transmission direction of the composite signal.
Fig. 13 is a schematic structural diagram of another WDL-adjustable VOA according to an embodiment of the present disclosure. In the present embodiment, a relay group is used inside the VOA instead of the motor 1 in the previous embodiment, and a coated flat plate group is used instead of the WDL glass.
As shown in fig. 14, each relay is connected to one plating flat plate, and the relay drives the plating flat plate connected to the relay to move at two points under the voltage of the power supply device, so that the plating flat plate is connected to or avoids a signal light path. The set of coated flat plates shown in fig. 14 includes 2n coated flat plates, where the WDL curve slope corresponding to n coated flat plates is less than 0, and the WDL curve slope corresponding to n flat plates is greater than 0. Each of the plating plates is plated with a different WDL film, each WDL film corresponding to a different WDL curve slope k, as shown in fig. 15, wherein WDL adjustment curves (i) to (iv) respectively correspond to the plating plates 1 'to n', and adjustment curves (v) to (v) respectively correspond to the plating plates 1 to n. As can be seen from fig. 15, the value of the slope k may be positive or negative, the position order between the coating flat plates may be freely exchanged, and the number of the WDL curve slopes k larger than 0 and smaller than 0 may also be freely allocated, which are not limited to the illustration in fig. 14 and 15.
It should be noted that, when the wave combining signal does not need WDL adjustment, the calculation control unit sends an instruction to each relay to move all the coating plates out; meanwhile, the plurality of coating flat plates can be combined to realize the accurate adjustment of the adjustment slope of the wave combination signal WDL.
Alternatively, both the mirror 1 and the mirror 2 in fig. 13 may be eliminated, so that the input end collimator is directly connected to the coated flat plate set, the output end collimator is directly connected to the attenuation sheet, and the signal light input end and the signal light output end of the VOA are output from both the upper and lower sides.
Alternatively, only one of the mirrors 1 and 2 in fig. 13 may be left, so that the signal light input and output ends of the VOA are also two-side output fibers. For example, the signal light input end is on the upper side or lower side of the VOA, and the output end is on the right side of the VOA.
Optionally, both the mirror 1 and the mirror 2 in fig. 13 are replaced by prisms, or one of them is replaced by a prism, and the present embodiment is not limited in contrast.
The working principle and technical effect of the VOA in this embodiment may refer to the foregoing method embodiment, and are not described herein again.
Those skilled in the art will appreciate that all or part of the steps of implementing the above method embodiments may be accomplished by a program in the computing control unit instructing the associated hardware (e.g., motor) to do so. The program may be stored in a computer-readable storage medium. The above-mentioned storage medium may be a read-only memory, a random access memory, or the like. The hardware may include a processing unit or a processor, which may be a central processing unit, a general purpose processor, an Application Specific Integrated Circuit (ASIC), a microprocessor (DSP), a Field Programmable Gate Array (FPGA) or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof.
The terms "first," "then," "last," and the like in the description and claims of the embodiments of the present application and in the drawings described above are not used to describe a particular order or sequence. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced otherwise than as specifically illustrated or described herein. Furthermore, the terms "comprises," "comprising," or "having," and any variations thereof, are intended to cover non-exclusive alternatives, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
While the present application has been described in connection with various embodiments, other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed application, from a review of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality. A single piece of hardware or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.
The present application has been described with reference to flowchart illustrations and/or block diagrams of product structures and methods according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While the invention has been described in conjunction with specific features and embodiments thereof, it will be evident that various modifications and combinations can be made thereto without departing from the spirit and scope of the invention. Accordingly, the specification and figures are merely exemplary of the invention as defined in the appended claims and are intended to cover any and all modifications, variations, combinations, or equivalents within the scope of the invention. It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (18)
1. A variable optical attenuator attenuation adjustment method, the method comprising:
the variable optical attenuator acquires adjustment information of a coated element and adjustment information of an attenuation sheet, wherein the adjustment information of the coated element indicates a first target position of the coated element, a combined wave signal penetrates through a target sub-region of the coated element, the target sub-region is one of sub-regions with different adjustment slopes of a plurality of wavelength-dependent losses (WDL) included in the coated element, the adjustment information of the attenuation sheet indicates a second target position of the attenuation sheet, the combined wave signal penetrates through a target light-passing region of the attenuation sheet, and the target light-passing region is one of light-passing regions with different attenuation values included in the attenuation sheet;
the variable optical attenuator sends the adjustment information of the film coating element to a first driving device, and the first driving device adjusts the film coating element to the first target position according to the adjustment information of the film coating element;
and the variable optical attenuator sends the adjustment information of the attenuation sheet to a second driving device, and the second driving device adjusts the attenuation sheet to the second target position according to the adjustment information of the attenuation sheet.
2. The method of claim 1, wherein before the variable optical attenuator obtains the adjustment information of the coated component and the adjustment information of the attenuation sheet, the method further comprises:
receiving an external regulation requirement, wherein the external regulation requirement comprises WDL and a total attenuation value which need to be regulated by the combined wave signal, and the variable optical attenuator acquires the regulation information of the film coating element according to the WDL which needs to be regulated by the combined wave signal; and acquiring the adjustment information of the attenuation sheet according to the total attenuation value.
3. The method of any one of claims 1 and 2, wherein a total attenuation of the combined signal through the variable optical attenuator is equal to a sum of an attenuation of the combined signal through the coated element and an attenuation of the combined signal through the attenuator pad.
4. The method of any of claims 1 and 2, wherein said sub-regions of said coating element are arranged in order of decreasing slope of said WDL adjustment.
5. The method of any of claims 1 and 2, wherein after the variable optical attenuator obtains the adjustment information of the filming element and the adjustment information of the attenuation sheet, the variable optical attenuator sends the adjustment information of the filming element to the first driving device and simultaneously sends the adjustment information of the attenuation sheet to the second driving device.
6. The method of any of claims 1 and 2, wherein the variable optical attenuator first obtains and sends the adjustment information of the film coating element to the first driving device, and then the variable optical attenuator obtains and sends the adjustment information of the attenuation sheet to the second driving device.
7. The method as claimed in any one of claims 1 and 2, wherein the adjustment information of the coating element, the sub-region through which the combined signal passes, and the adjustment slope of the WDL have a correspondence relationship, and the correspondence relationship is preset in the variable optical attenuator.
8. The method according to any one of claims 1 and 2, further comprising:
a first position sensor feeds back the position of the coated element to the variable optical attenuator until the coated element reaches the first target position;
a second position sensor feeds back the position of the attenuation sheet to the variable optical attenuator until the attenuation sheet reaches the second target position.
9. The method according to any one of claims 1 and 2, wherein the first drive means comprises a plurality of relays connected one to a plurality of said sub-zones for adjusting the position of the plurality of said sub-zones in accordance with the adjustment information of the filming element.
10. A variable optical attenuator, comprising:
a coating element for adjusting WDL of the variable optical attenuator, the coating element comprising a plurality of sub-areas having different WDL adjustment slopes;
the attenuation sheet is used for controlling the power attenuation of the combined wave signal, the attenuation sheet comprises a plurality of light-transmitting areas, and the attenuation values of the different light-transmitting areas of the attenuation sheet on the combined wave signal are different;
the calculation control unit is used for acquiring adjustment information of a coating element and adjustment information of an attenuation sheet, wherein the adjustment information of the coating element indicates a first target position of the coating element, the combined wave signal penetrates through a target sub-region of the coating element, the target sub-region is one of a plurality of sub-regions with different wavelength-dependent loss WDL adjustment slopes, the adjustment information of the attenuation sheet indicates a second target position of the attenuation sheet, the combined wave signal penetrates through a target light-passing region of the attenuation sheet, and the target light-passing region is one of a plurality of light-passing regions with different attenuation values, and the attenuation sheet comprises the attenuation sheet;
the first driving device is connected with the film coating element and used for adjusting the film coating element to the first target position according to the adjustment information of the film coating element acquired by the calculation control unit so that the combined wave signal penetrates through the target sub-area of the film coating element;
and the second driving device is connected with the attenuation sheet and used for adjusting the attenuation sheet to the second target position according to the adjustment information of the attenuation sheet acquired by the calculation control unit so that the combined wave signal passes through the target light-passing area of the attenuation sheet.
11. The variable optical attenuator of claim 10, wherein before the calculation control unit obtains the adjustment information of the coated element and the adjustment information of the attenuation sheet, the calculation control unit further comprises:
receiving an external regulation requirement, wherein the external regulation requirement comprises WDL and a total attenuation value which need to be regulated by the combined wave signal, and the calculation control unit acquires the regulation information of the coating element according to the WDL which needs to be regulated by the combined wave signal; and acquiring the adjustment information of the attenuation sheet according to the total attenuation value.
12. The variable optical attenuator of any one of claims 10 and 11, wherein a total attenuation of the combined signal through the variable optical attenuator is equal to a sum of an attenuation of the combined signal through the coated element and an attenuation of the combined signal through the attenuator pad.
13. The variable optical attenuator of any one of claims 10 and 11, wherein said sub-regions of said filming elements are arranged in order of decreasing to increasing slope of said WDL adjustment.
14. The variable optical attenuator of any one of claims 10 and 11, wherein the calculation control unit is further configured to send adjustment information of the coating element to the first driving device.
15. The variable optical attenuator according to any one of claims 10 and 11, wherein the calculation control unit is further configured to send adjustment information of the attenuation sheet to the second driving device.
16. The variable optical attenuator of any one of claims 10 and 11, wherein the adjustment information of the coating element, the sub-region through which the combined signal passes, and the adjustment slope of the WDL have a correspondence relationship, and the correspondence relationship is preset in the variable optical attenuator.
17. The variable optical attenuator according to any one of claims 10 and 11, further comprising:
the first position sensor is connected with the film coating element and used for feeding back the position of the film coating element to the calculation control unit;
and the second position sensor is connected with the attenuation sheet and used for feeding back the position of the attenuation sheet to the calculation control unit.
18. The variable optical attenuator according to any one of claims 10 and 11, wherein the first driving means comprises a plurality of relays connected to a plurality of the sub-zones one by one for adjusting the positions of the plurality of the sub-zones according to the adjustment information of the filming element.
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| CN114156722B (en) * | 2021-12-15 | 2023-12-22 | 无锡市德科立光电子技术股份有限公司 | Control method of VOA in variable gain erbium-doped fiber amplifier |
| CN115058701B (en) * | 2022-07-22 | 2024-02-06 | 无锡邑文微电子科技股份有限公司 | Data communication system, method and CVD film plating equipment |
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2020
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101963685A (en) * | 2009-07-22 | 2011-02-02 | 北京波联汇成科技有限公司 | Variable optical attenuator capable of compensating WDL by adjusting optical waveguide position |
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