A bidirectional tunable light attenuation method supporting multi-wavelength light source systems

Abstract

This invention provides a bidirectional adjustable optical attenuation method supporting multi-wavelength light source systems, belonging to the technical field of debugging equipment. The invention includes seven steps: same-side optical power ratio calibration, opposite-side optical power ratio calibration, same-side combined light measurement, variable optical attenuator attenuation adjustment, combined light power measurement, opposite-side optical power correction, and same-side optical power ratio correction. The beneficial effects of this invention are: the optical signal can be input from the first light source group under test, attenuated to the output of the second light source group under test, or input from the second light source group under test, attenuated to the output of the first light source group under test. It solves the problems of high cost, time-consuming and labor-intensive operation, and production blockage risks caused by rebuilding the environment, resulting from traditional unidirectional adjustable attenuators. It enables testing different test objects without rebuilding the environment, achieving environmental stability, saving users 75% of costs, reducing labor costs, and significantly reducing the production blockage risks caused by rebuilding the environment.

Description

Technical Field

[0001] This invention relates to the field of debugging equipment technology, and specifically to a bidirectional adjustable light attenuation method that supports multi-wavelength light source systems. Background Technology

[0002] With the gradual popularization of fiber-to-the-home (FTTH) in my country, fiber optic communication is entering ordinary households, and the production of optical network units (ONTs), i.e., optical modems, is increasing year by year. With the development of broadband services and the gradual popularization of WiFi 6, the application speed of ONTs is currently evolving from gigabit passive optical networks (PONs) to providing 10 Gbit / s PONs. Since the ONT and the optical line terminal (OLT) of the central office equipment (COP) use a single-fiber bidirectional communication method, testing of both ONTs and the COP involves two light sources: 1270nm and 1310nm on the ONT side, and 1490nm and 1577nm on the COP side. Manufacturers of ONTs and COPs often equip themselves with the same testing system to quickly achieve mass production capacity. Due to the large production volume, the cost and efficiency of the testing system have a significant impact on the final cost and output of the product. Currently, in hybrid testing systems for optical modems and optical line terminals of central office equipment, if a single testing system is tested using the traditional unidirectional adjustable attenuation method, equipping each wavelength light source with a traditional unidirectional adjustable attenuator will lead to a significant increase in testing costs and be detrimental to the final cost control of the product. When only one traditional unidirectional adjustable attenuator is equipped, it will result in repeated setup of the testing system for products of different specifications and wavelengths, which is time-consuming and labor-intensive. Once a system malfunction occurs, it will block production testing and hinder production capacity. Summary of the Invention

[0003] To address the problems in existing technologies, this invention provides a bidirectional adjustable optical attenuation method that supports multi-wavelength light source systems. Through seven steps—including same-side optical power ratio calibration, opposite-side optical power ratio calibration, same-side combined optical measurement, variable attenuator attenuation adjustment, combined optical power measurement, opposite-side optical power correction, and same-side optical power ratio correction—the optical signal is attenuated using this bidirectional adjustable optical attenuation method. This method allows the signal to be input from the first light source group under test and output from the second light source group under test, or vice versa. It solves the problems of high cost, time-consuming and labor-intensive processes, and production bottleneck risks caused by rebuilding the environment in hybrid testing systems of optical modems and central office equipment optical line terminals, which are often associated with traditional unidirectional adjustable attenuators.

[0004] This invention provides a bidirectional tunable light attenuation method that supports multi-wavelength light source systems, comprising the following steps:

[0005] Step 1: Calibrate the same-side optical power ratio. Adjust the attenuation value of the cascaded adjustable optical attenuators to the maximum to achieve optical shutdown. Record the power of the first optical splitter detector as PA0 and the power of the second optical splitter detector as PB0. Keep the light source on the first optical modem side on and the light source on the second optical modem side off. Record the power ratio of the first optical splitter detector to PA0 as xa1. Keep the light source on the first optical modem side off and the light source on the second optical modem side on. Record the power ratio of the first optical splitter detector to PA0 as xa2. Keep the light source on the optical line terminal side of the first central office equipment on and the light source on the optical line terminal side of the second central office equipment off. Record the power ratio of the second optical splitter detector to PB0 as yb1. Keep the light source on the optical line terminal side of the first central office equipment off and the light source on the optical line terminal side of the second central office equipment on. Record the power ratio of the second optical splitter detector to PB0 as yb2.

[0006] Step 2: Calibrate the opposite-side optical power ratio. Keep the light sources at the optical line terminal side of the first and second central office equipment off, and keep the light sources at the first and second optical modems on. Record the power of the second optical splitter detector as PB0'. Keep the light source at the first optical modem on and the light source at the second optical modem off, and record the power ratio of the second optical splitter detector to PB0' as xb1. Keep the light source at the first optical modem off and the light source at the second optical modem on, and record the power ratio of the second optical splitter detector to PB0' as xb2. The opposite-side optical power ratio is then calibrated. Let the light source at the optical line terminal side of the first central office equipment and the optical line terminal side of the second central office equipment be turned on, and the light source at the first optical modem side and the optical modem side be turned off. Let the power detected by the first optical splitter be PA0'. Let the light source at the optical line terminal side of the first central office equipment be turned on and the light source at the optical line terminal side of the second central office equipment be turned off. Let the ratio of the power of the first optical splitter to PB0' be ya1. Let the light source at the optical line terminal side of the first central office equipment be turned off and the light source at the optical line terminal side of the second central office equipment be turned on. Let the ratio of the power of the first optical splitter to PB0' be ya2.

[0007] Step 3: Same-side combined light measurement. Turn on the light sources on the two optical modem sides and the light sources on the two central office equipment optical line terminal sides. Adjust the attenuation value of the cascaded adjustable optical attenuators to the maximum to achieve optical shutdown. Record the power of the first optical splitter detector as PA1 and the power of the second optical splitter detector as PB1.

[0008] Step 4: Adjust the attenuation value of the variable optical attenuator, adjust the attenuation of the cascaded adjustable optical attenuators to a non-off value;

[0009] Step 5: Measure the combined optical power. Taking the attenuation setting for the light source on the first optical modem side as an example, let PA2 be the power of the first optical splitter detector and PB2 be the power of the second optical splitter detector.

[0010] Step 6: Optical power correction. Taking the setting of attenuation for the light source on the first optical modem side as an example, the power of the combined light from the light source on the first optical modem side and the light source on the second optical modem side is PA1 in the first optical splitter detector and PB2-PB1 in the second optical splitter detector.

[0011] Step 7: Correction of the same measurement optical power ratio. Taking the setting of attenuation for the light source on the first optical modem side as an example, according to the calibration values ​​in Step 1 and Step 2, the power of the light source in the first optical splitter detector is PA1*xa1, and the power in the second optical splitter detector is (PB2-PB1)*xb1; then the actual attenuation value is PA1*x1a-(PB2-PB1)*xb1.

[0012] In a further improvement to the present invention, in step 1, PA0 is the power of the combined light of the first optical modem side light source and the second optical modem side light source detected by the first optical splitter; PB0 is the power of the combined light of the first central office equipment optical line terminal side light source and the second central office equipment optical line terminal side light source detected by the second optical splitter.

[0013] In a further improvement to this invention, in step 2, PB0' is the power of the combined light from the first optical modem side light source and the second optical modem side light source detected by the second optical splitter detector after being attenuated by a cascaded adjustable optical attenuator; PA0' is the power of the light from the first central office equipment optical line terminal side light source and the second central office equipment optical line terminal side light source detected by the first optical splitter detector after being attenuated by a cascaded adjustable optical attenuator.

[0014] In a further improvement to this invention, in step 2, xb1, xb2, ya1, ya2 need to be measured at multiple different attenuation points for fitting and table lookup.

[0015] In a further improvement to this invention, steps 1 and 2 are executed only once after the test environment is set up and before the test begins, and are executed automatically by the software program. The methods described in steps 3, 4, 5, 6, and 7 need to be executed during the formal measurement.

[0016] In a further improvement to the present invention, in step 3, PA1 is the power of the combined light from the first optical modem side light source and the second optical modem side light source detected by the first optical splitter detector; PB1 is the power of the combined light from the first central office equipment optical line terminal side light source and the second central office equipment optical line terminal side light source detected by the second optical splitter detector.

[0017] In a further improvement to this invention, in step 4, the attenuation of the cascaded adjustable light attenuators is adjusted to a certain non-off value, at which point the light signals of the two light source groups under test can reach the other side through the cascaded adjustable light attenuators.

[0018] In a further improvement to this invention, in step 5, taking the setting of attenuation for the light source on the first optical modem side as an example, PA2 is the optical signal superimposed after the combined light of the first optical modem side light source and the second optical modem side light source detected by the first optical splitter detector, and the combined light of the first central office equipment optical line terminal side light source and the second central office equipment optical line terminal side light source are attenuated by cascaded adjustable optical attenuators; PB2 is the optical signal superimposed after the combined light of the first central office equipment optical line terminal side light source and the second central office equipment optical line terminal side light source detected by the second optical splitter detector, and the combined light of the first optical modem side light source and the second optical modem side light source are attenuated by cascaded adjustable optical attenuators.

[0019] In a further improvement to this invention, in step 7, the difference between the actual attenuation value and the set attenuation value is used to determine whether the optical splitter detector determines that the actual attenuation value has reached the set attenuation value, thus satisfying the attenuation deviation specification and ending the adjustment.

[0020] In a further improvement to this invention, in step 7, the difference between the actual attenuation value and the set attenuation value is used to determine whether the optical splitter detector determines that the actual attenuation value has not reached the set attenuation value. In this case, steps 4 to 7 are repeated until the attenuation deviation specification is met and the adjustment ends.

[0021] Compared with existing technologies, the beneficial effects of this invention are as follows: Through seven steps—simultaneous optical power ratio calibration, opposite-side optical power ratio calibration, simultaneous beam measurement, variable attenuator attenuation adjustment, simultaneous beam power measurement, opposite-side optical power correction, and simultaneous beam power ratio correction—the optical signal can be input from the first group of light sources under test, attenuated, and output from the second group of light sources under test, or input from the second group of light sources under test, attenuated, and output from the first group of light sources under test. This solves the problems of high cost, time-consuming and labor-intensive operation, and production blockage risks caused by traditional unidirectional adjustable attenuators in mixed testing systems of optical modems and central office equipment optical line terminals. It enables the measurement of two different test objects when four online light sources are present simultaneously using a single adjustable optical attenuator, and achieves bidirectional adjustment of the light source signal, thus supporting bidirectional adjustability of multi-wavelength light source systems. This significantly reduces usage and labor costs, and solves the problems of high cost, time-consuming and labor-intensive operation, and production blockage risks caused by traditional adjustable attenuators in mixed testing systems of optical modems and central office equipment optical line terminals. Moreover, this invention is not only applicable to optical line terminal testing of optical modems and central office equipment, but also to bidirectional testing of multiple online light sources. Attached Figure Description

[0022] To more clearly illustrate the solutions in this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a flowchart of the bidirectional tunable light attenuation method for multi-wavelength light source systems according to the present invention. Detailed Implementation

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, not to describe a particular order.

[0025] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0026] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0027] like Figure 1 As shown, the present invention provides a bidirectional tunable light attenuation method that supports multi-wavelength light source systems, comprising the following steps:

[0028] Step 1: Calibrate the same-side optical power ratio. Adjust the attenuation value of the cascaded adjustable optical attenuators to the maximum to achieve optical shutdown. Record the power of the first optical splitter detector as PA0 and the power of the second optical splitter detector as PB0. Keep the light source on the first optical modem side on and the light source on the second optical modem side off. Record the power ratio of the first optical splitter detector to PA0 as xa1. Keep the light source on the first optical modem side off and the light source on the second optical modem side on. Record the power ratio of the first optical splitter detector to PA0 as xa2. Keep the light source on the optical line terminal side of the first central office equipment on and the light source on the optical line terminal side of the second central office equipment off. Record the power ratio of the second optical splitter detector to PB0 as yb1. Keep the light source on the optical line terminal side of the first central office equipment off and the light source on the optical line terminal side of the second central office equipment on. Record the power ratio of the second optical splitter detector to PB0 as yb2.

[0029] Step 2: Calibrate the opposite-side optical power ratio. Keep the light sources at the optical line terminal side of the first and second central office equipment off, and keep the light sources at the first and second optical modems on. Record the power of the second optical splitter detector as PB0'. Keep the light source at the first optical modem on and the light source at the second optical modem off, and record the power ratio of the second optical splitter detector to PB0' as xb1. Keep the light source at the first optical modem off and the light source at the second optical modem on, and record the power ratio of the second optical splitter detector to PB0' as xb2. The opposite-side optical power ratio is then calibrated. Let the light source at the optical line terminal side of the first central office equipment and the optical line terminal side of the second central office equipment be turned on, and the light source at the first optical modem side and the optical modem side be turned off. Let the power detected by the first optical splitter be PA0'. Let the light source at the optical line terminal side of the first central office equipment be turned on and the light source at the optical line terminal side of the second central office equipment be turned off. Let the ratio of the power of the first optical splitter to PB0' be ya1. Let the light source at the optical line terminal side of the first central office equipment be turned off and the light source at the optical line terminal side of the second central office equipment be turned on. Let the ratio of the power of the first optical splitter to PB0' be ya2.

[0030] Step 3: Same-side combined light measurement. Turn on the light sources on the two optical modem sides and the light sources on the two central office equipment optical line terminal sides. Adjust the attenuation value of the cascaded adjustable optical attenuators to the maximum to achieve optical shutdown. Record the power of the first optical splitter detector as PA1 and the power of the second optical splitter detector as PB1.

[0031] Step 4: Adjust the attenuation value of the variable optical attenuator, adjust the attenuation of the cascaded adjustable optical attenuators to a non-off value;

[0032] Step 5: Measure the combined optical power. Taking the attenuation setting for the light source on the first optical modem side as an example, let PA2 be the power of the first optical splitter detector and PB2 be the power of the second optical splitter detector.

[0033] Step 6: Optical power correction. Taking the setting of attenuation for the light source on the first optical modem side as an example, the power of the combined light from the light source on the first optical modem side and the light source on the second optical modem side is PA1 in the first optical splitter detector and PB2-PB1 in the second optical splitter detector.

[0034] Step 7: Correction of the same measurement optical power ratio. Taking the setting of attenuation for the light source on the first optical modem side as an example, according to the calibration values ​​in Step 1 and Step 2, the power of the light source in the first optical splitter detector is PA1*xa1, and the power in the second optical splitter detector is (PB2-PB1)*xb1; then the actual attenuation value is PA1*x1a-(PB2-PB1)*xb1.

[0035] like Figure 1 As shown, in step 1, the attenuation value of the cascaded adjustable optical attenuators is adjusted to the maximum to achieve optical shutdown. At this time, the optical signal detected by the first optical splitter is only the combined light of the first optical modem side light source and the second optical modem side light source, which is PA0; the optical signal detected by the second optical splitter detector is only the combined light of the first central office equipment optical line terminal side light source and the second central office equipment optical line terminal side light source, which is PB0; the first optical modem side light source is kept on and the second optical modem side light source is kept off. At this time, the first optical splitter detector only detects the power of the first optical modem side light source, and its ratio with PA0 is xa1; the first optical modem side light source is kept off and the second optical modem side light source is kept off. When the light source is kept on, the first optical splitter detector detects only the power of the light source on the second optical modem side, and its ratio to PA0 is xa2. When the light source on the optical line terminal side of the first central office equipment is kept on and the light source on the optical line terminal side of the second central office equipment is kept off, the second optical splitter detector detects only the power of the light source on the optical line terminal side of the first central office equipment, and its ratio to PB0 is yb1. When the light source on the optical line terminal side of the first central office equipment is kept off and the light source on the optical line terminal side of the second central office equipment is kept on, the second optical splitter detector detects only the power of the light source on the optical line terminal side of the second central office equipment, and its ratio to PB0 is yb2.

[0036] like Figure 1As shown, with the optical line terminal side light source of the first central office equipment and the optical line terminal side light source of the second central office equipment kept off, and the first optical modem side light source and the second optical modem side light source kept on, the second optical splitter detector detects only the power of the combined light from the first optical modem side light source and the second optical modem side light source after cascading attenuation by the adjustable optical attenuator, which is PB0'; with the first optical modem side light source kept on and the second optical modem side light source kept off, the second optical splitter detector detects only the power of the first optical modem side light source after cascading attenuation by the adjustable optical attenuator, and its ratio to PB0' is xb1; with the first optical modem side light source kept off and the second optical modem side light source kept on, the second optical splitter detector detects only the power of the second optical modem side light source after cascading attenuation by the adjustable optical attenuator, and its ratio to PB0' is xb2; with the first optical modem side light source kept off and the second optical modem side light source kept on, the second optical splitter detector detects only the power of the second optical modem side light source after cascading attenuation by the adjustable optical attenuator, and its ratio to PB0' is xb2; With the terminal-side light source kept on and the first and second optical modem-side light sources kept off, the first optical splitter detector detects only the power of the terminal-side light source of the first central office equipment optical line after cascading attenuation by the adjustable optical attenuator, denoted as PA0'. With the first central office equipment optical line terminal-side light source kept on and the second central office equipment optical line terminal-side light source kept off, the first optical splitter detector detects only the power of the terminal-side light source of the first central office equipment optical line after cascading attenuation by the adjustable optical attenuator, and its ratio to PA0' is ya1. With the first central office equipment optical line terminal-side light source kept off and the second central office equipment optical line terminal-side light source kept on, the first optical splitter detector detects only the power of the terminal-side light source of the second central office equipment optical line after cascading attenuation by the adjustable optical attenuator, and its ratio to PA0' is ya2.

[0037] like Figure 1 As shown, in step 2, xb1, xb2, ya1, ya2 need to measure the values ​​of multiple different attenuation points and then fit and look up the table.

[0038] like Figure 1 As shown, steps 1 and 2 are executed only once after the test environment is set up and before the test begins, and are executed automatically by the software program, taking milliseconds. The methods described in steps 3, 4, 5, 6 and 7 are the ones that need to be executed during the actual measurement.

[0039] like Figure 1 As shown, in step 3, the two optical modem-side light sources and the two central office equipment optical line terminal-side light sources are turned on, and the attenuation value of the cascaded adjustable optical attenuators is adjusted to the maximum to achieve optical shutdown. At this time, the optical signal detected by the first optical splitter is only the combined light of the first optical modem-side light source and the second optical modem-side light source, which is PA1; the optical signal detected by the second optical splitter is only the combined light of the first central office equipment optical line terminal-side light source and the second central office equipment optical line terminal-side light source, which is PB1.

[0040] like Figure 1 As shown, in step 4, the attenuation of the cascaded adjustable light attenuators is adjusted to a certain non-off value. At this time, the light signals of the two light source groups under test can reach the other side through the cascaded adjustable light attenuators.

[0041] like Figure 1 As shown, in step 5, taking the setting of attenuation for the light source on the first optical modem side as an example, the first optical splitter detector detects the combined light of the light source on the first optical modem side and the light source on the second optical modem side, and the combined light of the light source on the optical line terminal side of the first central office equipment and the light source on the optical line terminal side of the second central office equipment, and the superimposed optical signal after being attenuated by cascaded adjustable optical attenuators, which is PA2; the second optical splitter detector detects the combined light of the light source on the optical line terminal side of the first central office equipment and the light source on the optical line terminal side of the second central office equipment, and the superimposed optical signal after being attenuated by cascaded adjustable optical attenuators, which is PB2.

[0042] like Figure 1 As shown, in step 7, the difference between the actual attenuation value and the set attenuation value is used to determine whether the optical splitter detector determines that the actual attenuation value has reached the set attenuation value, thus satisfying the attenuation deviation specification and ending the adjustment.

[0043] like Figure 1 As shown, in step 7, the difference between the actual attenuation value and the set attenuation value is used to determine whether the optical splitter detector determines that the actual attenuation value has not reached the set attenuation value. If so, steps 4 to 7 are repeated until the attenuation deviation specification is met and the adjustment ends.

[0044] As can be seen from the above, the beneficial effects of this invention are as follows: Through seven steps—simultaneous optical power ratio calibration, opposite-side optical power ratio calibration, simultaneous beam measurement, variable attenuator attenuation adjustment, simultaneous beam power measurement, opposite-side optical power correction, and simultaneous beam power ratio correction—the optical signal can be input from the first group of light sources under test, attenuated, and output from the second group of light sources under test, or input from the second group of light sources under test, attenuated, and output from the first group of light sources under test. This solves the problems of high cost, time-consuming and labor-intensive operation, and production blockage risks caused by the reconstruction of the environment in hybrid testing systems of optical modems and central office equipment optical line terminals. It enables the measurement of two different test objects when four online light sources are present simultaneously using a single adjustable optical attenuator, and achieves bidirectional adjustment of the light source signal, thus realizing bidirectional adjustability that supports multi-wavelength light source systems. This significantly reduces usage and labor costs, and solves the problems of high cost, time-consuming and labor-intensive operation, and production blockage risks caused by the reconstruction of the environment in hybrid testing systems of optical modems and central office equipment optical line terminals. Moreover, this invention is not only applicable to optical line terminal testing of optical modems and central office equipment, but also to bidirectional testing of multiple online light sources.

[0045] The specific embodiments described above are preferred embodiments of the present invention and are not intended to limit the specific scope of the present invention. The scope of the present invention includes, but is not limited to, these specific embodiments. All equivalent changes made in accordance with the present invention are within the protection scope of the present invention.

Claims

1. A bidirectional tunable light attenuation method supporting multi-wavelength light source systems, characterized in that: Includes the following steps: Step 1: Calibrate the same-side optical power ratio. Adjust the attenuation value of the cascaded adjustable optical attenuators to the maximum to achieve optical shutdown. Record the power of the first optical splitter detector as PA0 and the power of the second optical splitter detector as PB0. Keep the light source on the first optical modem side on and the light source on the second optical modem side off. Record the power ratio of the first optical splitter detector to PA0 as xa1. Keep the light source on the first optical modem side off and the light source on the second optical modem side on. Record the power ratio of the first optical splitter detector to PA0 as xa2. Keep the light source on the optical line terminal side of the first central office equipment on and the light source on the optical line terminal side of the second central office equipment off. Record the power ratio of the second optical splitter detector to PB0 as yb1. Keep the light source on the optical line terminal side of the first central office equipment off and the light source on the optical line terminal side of the second central office equipment on. Record the power ratio of the second optical splitter detector to PB0 as yb2. Step 2: Calibrate the opposite-side optical power ratio. Keep the light sources at the optical line terminal side of the first and second central office equipment off, and keep the light sources at the first and second optical modems on. Record the power of the second optical splitter detector as PB0'. Keep the light source at the first optical modem on and the light source at the second optical modem off, and record the power ratio of the second optical splitter detector to PB0' as xb1. Keep the light source at the first optical modem off and the light source at the second optical modem on, and record the power ratio of the second optical splitter detector to PB0' as xb2. The opposite-side optical power ratio is then calibrated. Let the light source at the optical line terminal side of the first central office equipment and the optical line terminal side of the second central office equipment be turned on, and the light source at the first optical modem side and the optical modem side be turned off. Let the power detected by the first optical splitter be PA0'. Let the light source at the optical line terminal side of the first central office equipment be turned on and the light source at the optical line terminal side of the second central office equipment be turned off. Let the ratio of the power of the first optical splitter to PB0' be ya1. Let the light source at the optical line terminal side of the first central office equipment be turned off and the light source at the optical line terminal side of the second central office equipment be turned on. Let the ratio of the power of the first optical splitter to PB0' be ya2. Step 3: Same-side combined light measurement. Turn on the light sources on the two optical modem sides and the light sources on the two central office equipment optical line terminal sides. Adjust the attenuation value of the cascaded adjustable optical attenuators to the maximum to achieve optical shutdown. Record the power of the first optical splitter detector as PA1 and the power of the second optical splitter detector as PB1. Step 4: Adjust the attenuation value of the variable optical attenuator, and adjust the attenuation of the cascaded adjustable optical attenuators to a non-off value. Step 5: Measure the combined optical power. Taking the attenuation setting for the light source on the first optical modem side as an example, let PA2 be the power of the first optical splitter detector and PB2 be the power of the second optical splitter detector. Step 6: Optical power correction. Taking the setting of attenuation for the light source on the first optical modem side as an example, the power of the combined light from the light source on the first optical modem side and the light source on the second optical modem side is PA1 in the first optical splitter detector and PB2-PB1 in the second optical splitter detector. Step 7: Correction of the same-side optical power ratio. Taking the setting of attenuation for the light source on the first optical modem side as an example, according to the calibration values ​​in Step 1 and Step 2, the power of the light source in the first optical splitter detector is PA1*xa1, and the power in the second optical splitter detector is (PB2-PB1)*xb1; then the actual attenuation value is PA1*xa1-(PB2-PB1)*xb1.

2. The bidirectional tunable light attenuation method for supporting multi-wavelength light source systems according to claim 1, characterized in that: In step 1, PA0 is the power of the combined light from the first optical modem side light source and the second optical modem side light source detected by the first optical splitter; PB0 is the power of the combined light from the first central office equipment optical line terminal side light source and the second central office equipment optical line terminal side light source detected by the second optical splitter.

3. The bidirectional tunable light attenuation method for supporting multi-wavelength light source systems according to claim 2, characterized in that: In step 2, PB0' is the power of the combined light from the first optical modem side light source and the second optical modem side light source detected by the second optical splitter after being attenuated by a cascaded adjustable optical attenuator; PA0' is the power of the light from the first central office equipment optical line terminal side light source and the second central office equipment optical line terminal side light source detected by the first optical splitter after being attenuated by a cascaded adjustable optical attenuator.

4. The bidirectional tunable light attenuation method for supporting multi-wavelength light source systems according to claim 3, characterized in that: In step 2, xb1, xb2, ya1, ya2 need to be measured at multiple different attenuation points for fitting and table lookup.

5. The bidirectional tunable light attenuation method for supporting multi-wavelength light source systems according to claim 4, characterized in that: Steps 1 and 2 are executed only once after the test environment is set up and before the test begins, and are executed automatically by the software program. The methods described in steps 3, 4, 5, 6, and 7 need to be executed during the formal measurement.

6. The bidirectional tunable light attenuation method for supporting multi-wavelength light source systems according to claim 5, characterized in that: In step 3, PA1 is the power of the combined light from the first optical modem side light source and the second optical modem side light source detected by the first optical splitter detector; PB1 is the power of the combined light from the first central office equipment optical line terminal side light source and the second central office equipment optical line terminal side light source detected by the second optical splitter detector.

7. The bidirectional tunable light attenuation method for supporting multi-wavelength light source systems according to claim 6, characterized in that: In step 4, the attenuation of the cascaded adjustable light attenuators is adjusted to a certain non-off value. At this time, the light signals of the two light source groups under test can reach the other side through the cascaded adjustable light attenuators.

8. The bidirectional tunable light attenuation method for supporting multi-wavelength light source systems according to claim 7, characterized in that: In step 5, taking the setting of attenuation for the first optical modem side light source as an example, PA2 is the optical signal superimposed after the combined light of the first optical modem side light source and the second optical modem side light source detected by the first optical split detector, and the combined light of the first central office equipment optical line terminal side light source and the second central office equipment optical line terminal side light source are attenuated by cascaded adjustable optical attenuators; PB2 is the optical signal superimposed after the combined light of the first central office equipment optical line terminal side light source and the second central office equipment optical line terminal side light source detected by the second optical split detector, and the combined light of the first optical modem side light source and the second optical modem side light source are attenuated by cascaded adjustable optical attenuators.

9. The bidirectional tunable light attenuation method for supporting multi-wavelength light source systems according to claim 8, characterized in that: In step 7, the difference between the actual attenuation value and the set attenuation value is used to determine whether the optical splitter detector determines that the actual attenuation value has reached the set attenuation value. If so, the attenuation deviation specification is met and the adjustment ends.

10. The bidirectional tunable light attenuation method for supporting multi-wavelength light source systems according to claim 9, characterized in that: In step 7, the difference between the actual attenuation value and the set attenuation value is used to determine whether the optical splitter detector determines that the actual attenuation value has not reached the set attenuation value. If so, steps 4 to 7 are repeated until the attenuation deviation specification is met and the adjustment ends.

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