An Adaptive Step Iterative Extinction Ratio Debugging Method and Device for Optical Modules

Abstract

The present invention discloses an extinction ratio debugging method and device for an optical module with adaptive step iteration, which relates to the field of optical communication technologies. The method includes: setting the extinction ratio debugging range and the extinction ratio target value of the optical module to be tested, and setting the initial debugging value of the digital-to-analog converter in the optical module to be tested; writing the initial debugging value into the register of the optical module to be tested, and reading the current extinction ratio value of the optical module to be tested; if the current extinction ratio value is within the extinction ratio debugging range, the extinction ratio debugging of the optical module to be tested is qualified; otherwise, based on the extinction ratio target value and the current extinction ratio value, calculating the target value of the digital-to-analog converter required for the next debugging; writing the target value of the digital-to-analog converter into the register of the optical module to be tested, and re-executing the step of reading the current extinction ratio value of the optical module to be tested to achieve iterative debugging. This avoids frequent manual intervention operations during the production process, so as to reduce the debugging time of the extinction ratio of the optical module.

Description

Technical Field

[0001] The present invention relates to the field of optical communication technologies, and in particular, to a method and device for debugging the extinction ratio of an optical module with adaptive step iteration. Background Art

[0002] Currently, when debugging the extinction ratio of an optical module, the fixed-step method is usually adopted. Due to the batch differences of optical devices, the fixed step cannot cover all production batches, and it is necessary to spend a lot of time for multiple debuggings, or frequently perform manual intervention to optimize the fixed step value in order to meet the required index requirements of the module. This takes up the eye diagram analyzer for a long time, resulting in a long production cycle and low equipment utilization rate. Summary of the Invention

[0003] In view of the above problems and technical requirements, the inventor of the present invention proposes a method and device for debugging the extinction ratio of an optical module with adaptive step iteration, which avoids frequent manual intervention operations during the production process to reduce the debugging time of the extinction ratio of the optical module.

[0004] The technical solution of the present invention is as follows:

[0005] In a first aspect, the present application provides a method for debugging the extinction ratio of an optical module with adaptive step iteration, including the following steps:

[0006] Set the extinction ratio debugging range and the extinction ratio target value of the optical module to be tested, and set the initial debugging value of the digital-to-analog converter in the optical module to be tested;

[0007] Write the initial debugging value of the digital-to-analog converter into the register of the optical module to be tested, and read the current extinction ratio value of the optical module to be tested;

[0008] If the current extinction ratio value is within the set extinction ratio debugging range, the extinction ratio debugging of the optical module to be tested is qualified;

[0009] Otherwise, based on the extinction ratio target value and the current extinction ratio value of the optical module to be tested, calculate the target value of the digital-to-analog converter required for the next debugging;

[0010] Write the target value of the digital-to-analog converter into the register of the optical module to be tested, and re-execute reading the current extinction ratio value of the optical module to be tested to implement iterative debugging.

[0011] A further technical solution thereof is that calculating the target value of the digital-to-analog converter required for the next debugging based on the extinction ratio target value and the current extinction ratio value of the optical module to be tested includes:

[0012] Construct a relationship between the optical modulation amplitude and the average optical power based on the extinction ratio formula;

[0013] Based on the arithmetic relationship between the modulation current and the optical modulation amplitude and the digital-to-analog converter (DAC) debugging value respectively, it is deduced that the DAC is proportional to the optical modulation amplitude, and thus:

[0014] DAC 当前值 / DAC 目标值 =OMA 当前值 / OMA 目标值 ;

[0015] Substitute the relationship between the optical modulation amplitude and the average optical power into the above formula to obtain the relationship between the target value of the DAC and the target value and the current value of the extinction ratio of the optical module to be measured, which is used to calculate the target value of the DAC required for the next debugging;

[0016] Among them, DAC 当前值 represents the target value of the DAC calculated during the previous debugging, and DAC 目标值 represents the target value of the DAC required for the next debugging; OMA 当前值 represents the current value of the optical modulation amplitude, and OMA 目标值 represents the target value of the optical modulation amplitude.

[0017] Its further technical solution is to construct the relationship between the optical modulation amplitude and the average optical power based on the extinction ratio formula, including:

[0018] The extinction ratio expression is: Er = 10log10(P1 / P0), where P1 represents the optical power of the high-level signal after modulation, and P0 represents the optical power of the low-level signal after modulation;

[0019] The optical modulation amplitude expression is: OMA = P1 - P0;

[0020] The average optical power expression is: P AVG = (P1 + P0) / 2;

[0021] Then, by constructing the above expressions, the relationship between the optical modulation amplitude and the average optical power is obtained as:

[0022]

[0023] Its further technical solution is to deduce that the DAC is proportional to the optical modulation amplitude based on the arithmetic relationship between the modulation current and the optical modulation amplitude and the DAC debugging value respectively, including:

[0024] The optical modulation amplitude expression is: OMA = η * Imod;

[0025] Among them, η is the slope of the electro-optical conversion curve of the optical module to be measured; Imod is the modulation current of the optical module to be measured, and its relationship with the debugging value of the digital-to-analog converter is: Imod = MOD_DAC * I, where I is the unit current fixed value and MOD_DAC is the debugging value of the digital-to-analog converter;

[0026] Combining the two formulas and deriving, a conclusion that the digital-to-analog converter is proportional to the optical modulation amplitude is obtained.

[0027] Its further technical solution is to substitute the relational formula between the optical modulation amplitude and the average optical power into the above formula to obtain the relational formula between the target value of the digital-to-analog converter and the target value and the current value of the extinction ratio of the optical module to be measured, including:

[0028] Based on the constructed relational formula between the optical modulation amplitude and the average optical power and the extinction ratio formula, it is obtained that:

[0029]

[0030] Substituting it into the proportional relational formula, it is obtained that:

[0031]

[0032] Among them, Er 当前值 represents the current value of the extinction ratio of the optical module to be measured read, and Er 目标值 represents the target value of the extinction ratio of the optical module to be measured set.

[0033] Its further technical solution is that the method further includes:

[0034] Setting the debugging range of the digital-to-analog converter in the optical module to be measured;

[0035] If the target value of the digital-to-analog converter required for the next debugging calculated is within the set debugging range of the digital-to-analog converter, then execute writing the target value of the digital-to-analog converter into the register of the optical module to be measured;

[0036] Otherwise, it is determined that the optical module to be measured has a defect and the extinction ratio debugging fails.

[0037] In a second aspect, the present application also provides an optical module extinction ratio debugging device with adaptive step iteration, and the device includes:

[0038] A parameter setting module, configured to set the debugging range and the target value of the extinction ratio of the optical module to be measured, and set the initial debugging value of the digital-to-analog converter in the optical module to be measured;

[0039] A parameter reading and writing module, configured to write the initial debugging value of the digital-to-analog converter or the target value of the digital-to-analog converter into the register of the optical module to be measured, and read the current value of the extinction ratio of the optical module to be measured;

[0040] The first determination module is used to output a determination conclusion that the extinction ratio debugging of the optical module to be tested is qualified when the current value of the extinction ratio is within the set extinction ratio debugging range;

[0041] The target value calculation module is used to calculate the target value of the digital-to-analog converter required for the next debugging based on the target value of the extinction ratio and the current value of the extinction ratio of the optical module to be tested when the current value of the extinction ratio exceeds the set extinction ratio debugging range.

[0042] A further technical solution thereof is that the target value calculation module further includes:

[0043] The first relational expression construction unit is used to construct a relational expression between the optical modulation amplitude and the average optical power based on the extinction ratio formula;

[0044] The proportional relational expression construction unit is used to establish DAC 当前值 / DAC 目标值 =OMA 当前值 / OMA 目标值 ;

[0045] The second relational expression construction unit is used to substitute the relational expression between the optical modulation amplitude and the average optical power into the proportional relational expression construction unit to obtain a relational expression between the target value of the digital-to-analog converter and the target value and the current value of the extinction ratio of the optical module to be tested, so as to calculate the target value of the digital-to-analog converter required for the next debugging;

[0046] Wherein, DAC 当前值 represents the target value of the digital-to-analog converter calculated during the previous debugging, and DAC 目标值 represents the target value of the digital-to-analog converter required for the next debugging; OMA 当前值 represents the current value of the optical modulation amplitude, and OMA 目标值 represents the target value of the optical modulation amplitude.

[0047] A further technical solution thereof is that the parameter setting module is further used to set the debugging range of the digital-to-analog converter in the optical module to be tested, and the device further includes:

[0048] The deployment module is used to call the parameter reading and writing module when the target value of the digital-to-analog converter required for the next debugging calculated is within the set debugging range of the digital-to-analog converter;

[0049] The second determination module is used to output a conclusion that the optical module to be tested is determined to be defective and the extinction ratio debugging fails when the target value of the digital-to-analog converter required for the next debugging calculated exceeds the set debugging range of the digital-to-analog converter.

[0050] The beneficial technical effects of the present invention are:

[0051] This method and device change the traditional fixed-step extinction ratio adjustment of optical modules to adaptive-step debugging. Compared with the technical solutions in the background art, it can intelligently debug the extinction ratio of optical modules, avoiding the practice of manually optimizing fixed step values with frequent human intervention. Thus, it saves the debugging time and labor costs of the optical module extinction ratio and improves the utilization rate of production equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 is a flowchart of the method for debugging the extinction ratio of an optical module with adaptive-step iteration provided by this application.

[0053] Figure 2 is a schematic diagram of the device for debugging the extinction ratio of an optical module with adaptive-step iteration provided by this application.

[0054] Figure 3 is a schematic diagram of the target value calculation module provided by this application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0055] The following further describes the specific embodiments of the present invention with reference to the drawings.

[0056] Embodiment 1:

[0057] As Figure 1 shown, the embodiment of this application provides a method for debugging the extinction ratio of an optical module with adaptive-step iteration. Taking the GN25L95B driver chip solution as an example, it includes the following steps:

[0058] Step 10: Set the extinction ratio debugging range and the extinction ratio target value of the optical module to be measured, denoted as Er 目标值 ; Set the debugging range and the initial debugging value of the digital-to-analog converter in the optical module to be measured.

[0059] Among them, the extinction ratio debugging range is the range between the set maximum extinction ratio Er max and the minimum extinction ratio Er min The extinction ratio target value is between the maximum and minimum values, usually taking the intermediate value. Similarly, the debugging range of the digital-to-analog converter is the range between the set maximum value DAC max and the minimum value DAC min Generally between 0 and 255, and the set initial debugging value does not reach the endpoint value and is usually set according to empirical values.

[0060] Step 20: Write the initial debugging value of the digital-to-analog converter into the register of the optical module to be measured, and use an eye diagram tester to read the current extinction ratio value of the optical module to be measured, denoted as Er 当前值 .

[0061] Step 30: If the current extinction ratio value is within the set extinction ratio debugging range, that is, Er min <Er 当前值<Er max , then the extinction ratio debugging of the optical module to be measured is qualified, and the optical module extinction ratio debugging method is exited.

[0062] Step 40: If the current value of the extinction ratio exceeds the set extinction ratio debugging range, that is, Er 当前值 ≥Er max or Er 当前值 ≤Er min , then based on the target value of the extinction ratio and the current value of the extinction ratio of the optical module to be measured, calculate the target value of the digital-to-analog converter required for the next debugging. The calculation method includes the following steps:

[0063] 1) Construct a relationship between the optical modulation amplitude and the average optical power based on the extinction ratio formula.

[0064] The extinction ratio expression is: Er = 10log10(P1 / P0), where P1 represents the optical power of the high-level signal after modulation, and P0 represents the optical power of the low-level signal after modulation.

[0065] The optical modulation amplitude refers to the difference between the high-level and low-level optical powers of the optical signal after modulation, and the expression is: OMA = P1 - P0.

[0066] The average optical power expression is: P AVG =(P1 + P0) / 2.

[0067] Then, by constructing the above expressions, the relationship between the optical modulation amplitude and the average optical power is obtained as:

[0068]

[0069] 2) Based on the arithmetic relationship between the modulation current and the optical modulation amplitude and the digital-to-analog converter debugging value respectively, it is deduced that the digital-to-analog converter is directly proportional to the optical modulation amplitude, including:

[0070] The optical modulation amplitude can also be expressed as: OMA = η * Imod;

[0071] Among them, η is the slope of the electro-optical conversion curve of the optical module to be measured; Imod is the modulation current of the optical module to be measured. Generally, the relationship between Imod and the digital-to-analog converter debugging value MOD_DAC is: Imod = MOD_DAC * I, where I is the unit current fixed value, that is, Imod = MOD_DAC * (1.6mA / 512).

[0072] Then, by combining the two equations, the conclusion that the digital-to-analog converter is directly proportional to the optical modulation amplitude can be deduced, and it is obtained that: DAC 当前值 / DAC 目标值 =OMA 当前值 / OMA 目标值 .

[0073] Then the DAC 目标值 = DAC 当前值 *OMA 目标值 / OMA 当前值 (2)

[0074] Wherein, DAC 当前值 represents the target value of the digital-to-analog converter calculated during the previous debugging, and DAC 目标值 represents the target value of the digital-to-analog converter required for the next debugging; OMA 当前值 represents the current value of the optical modulation amplitude, and OMA 目标值 represents the target value of the optical modulation amplitude.

[0075] 3) Substitute the relational expression between the optical modulation amplitude and the average optical power into Equation (2) to obtain the relational expression between the target value of the digital-to-analog converter and the extinction ratio target value and the current extinction ratio value of the optical module to be measured, which is used to calculate the target value of the digital-to-analog converter required for the next debugging. Specifically:

[0076] Based on the constructed relational expression (1) between the optical modulation amplitude and the average optical power and the extinction ratio formula, we get:

[0077]

[0078] Substitute it into Equation (2) deduced from the proportional relational expression, and we get:

[0079]

[0080] Step 50: If the target value of the digital-to-analog converter required for the next debugging calculated is within the debugging range of the set digital-to-analog converter, that is, DAC min < DAC 目标值 < DAC max , then execute Step 70.

[0081] Step 60: If the target value of the digital-to-analog converter required for the next debugging calculated exceeds the debugging range of the set digital-to-analog converter, that is, DAC 目标值 ≥DAC max or DAC 目标值 ≤DAC min , then it is determined that there is a defect in the optical module to be measured, the extinction ratio debugging fails, and the optical module extinction ratio debugging method is exited.

[0082] Step 70: Write the target value of the digital-to-analog converter into the register of the optical module to be measured, and re-execute reading the current extinction ratio value of the optical module to be measured using the eye diagram instrument, that is, repeat Steps 20 to 70 to achieve iterative debugging.

[0083] It should be understood that although the steps in the flowcharts involved in the above-described embodiments are sequentially shown according to the indications of the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise clearly stated in this document, the execution of these steps has no strict order limit, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-described embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be executed alternately or in rotation with at least a part of other steps or steps or stages in other steps.

[0084] Embodiment 2:

[0085] Based on the same inventive concept, the embodiment of the present application also provides an extinction ratio debugging device for an optical module with adaptive step iteration. The implementation solution provided by this device to solve problems is similar to the implementation solution described in the above method. Therefore, the specific limitations in an embodiment of the optical module extinction ratio debugging device provided below can refer to the limitations on the optical module extinction ratio debugging method in the above text, and will not be repeated here.

[0086] As Figure 2 shown, taking the GN25L95B drive chip solution as an example, the device includes a parameter setting module, a parameter reading and writing module, a first determination module, a second determination module, a target value calculation module, and a deployment module.

[0087] Among them:

[0088] The parameter setting module is used to set the extinction ratio debugging range Er ∈ (Er min , Er max ) and the extinction ratio target value, denoted as Er 目标值 , and set the debugging range DAC ∈ (DAC min , DAC max ) and the initial debugging value of the digital-to-analog converter in the optical module to be tested.

[0089] The parameter reading and writing module is used to write the initial debugging value or the target value of the digital-to-analog converter into the register of the optical module to be tested, and read the current extinction ratio value of the optical module to be tested, denoted as Er 当前值 .

[0090] The first determination module is used to output a determination conclusion that the extinction ratio debugging of the optical module to be tested is qualified when the current extinction ratio value is within the set extinction ratio debugging range, that is, Er min < Er 当前值 < Er max .

[0091] A target value calculation module, configured to calculate the target value of the digital-to-analog converter required for the next debugging, denoted as DAC, based on the target extinction ratio and the current extinction ratio of the optical module to be tested when the current value of the extinction ratio exceeds the set debugging range of the extinction ratio, i.e., Er 当前值 ≥Er max or Er 当前值 ≤Er min 。 目标值 。

[0092] A deployment module, configured to call a parameter reading and writing module when the target value of the digital-to-analog converter required for the next debugging calculated is within the set debugging range of the digital-to-analog converter, i.e., DAC min <DAC 目标值 <DAC max 。

[0093] A second determination module, configured to output a conclusion that the optical module to be tested is determined to be defective and the extinction ratio debugging fails when the target value of the digital-to-analog converter required for the next debugging calculated exceeds the set debugging range of the digital-to-analog converter, i.e., DAC 目标值 ≥DAC max or DAC 目标值 ≤DAC min 。

[0094] As Figure 3 shown, the target value calculation module further includes a first relationship construction unit, a second relationship construction unit, and a proportional relationship construction unit. Specifically:

[0095] The first relationship construction unit is configured to construct a relationship between the optical modulation amplitude and the average optical power based on the extinction ratio formula.

[0096] The proportional relationship construction unit is configured to establish DAC 当前值 / DAC 目标值 =OMA 当前值 / OMA 目标值 。

[0097] The second relationship construction unit is configured to substitute the relationship between the optical modulation amplitude and the average optical power into the proportional relationship construction unit to obtain a relationship between the target value of the digital-to-analog converter and the target extinction ratio and the current extinction ratio of the optical module to be tested, so as to calculate the target value of the digital-to-analog converter required for the next debugging.

[0098] Wherein, DAC 当前值 represents the target value of the digital-to-analog converter calculated during the previous debugging; OMA 当前值 represents the current value of the optical modulation amplitude, and OMA 目标值 represents the target value of the optical modulation amplitude.

[0099] For the specific components of each unit, please refer to the specific contents given in step 40 in embodiment 1, which will not be repeated here.

[0100] The method and device replace the traditional fixed stepping of the extinction ratio of the optical module with adaptive stepping debugging, which can intelligently debug the extinction ratio of the optical module and avoid the practice of frequent manual intervention to optimize the fixed stepping value, thereby saving the debugging time and labor costs of the extinction ratio of the optical module and improving the utilization rate of production equipment.

[0101] The above description is only a preferred embodiment of the present application, and the present invention is not limited to the above embodiment. It is understood that other improvements and variations directly derived or imagined by those skilled in the art without departing from the spirit and concept of the present invention should be considered to be included in the scope of protection of the present invention.

Claims

1. An extinction ratio debugging method for an optical module with adaptive step iteration, characterized in that The method includes: Setting the extinction ratio debugging range and the extinction ratio target value of the optical module to be tested, and setting the initial debugging value of the digital-to-analog converter in the optical module to be tested; Writing the initial debugging value of the digital-to-analog converter into the register of the optical module to be tested, and reading the current extinction ratio value of the optical module to be tested; If the current extinction ratio value is within the set extinction ratio debugging range, the extinction ratio debugging of the optical module to be tested is qualified; Otherwise, based on the extinction ratio target value and the current extinction ratio value of the optical module to be tested, calculate the target value of the digital-to-analog converter required for the next debugging; Write the target value of the digital-to-analog converter into the register of the optical module to be tested, and re-execute the step of reading the current extinction ratio value of the optical module to be tested to achieve iterative debugging; Among them, the calculating the target value of the digital-to-analog converter required for the next debugging based on the extinction ratio target value and the current extinction ratio value of the optical module to be tested includes: Constructing a relationship between the optical modulation amplitude and the average optical power based on the extinction ratio formula; Based on the arithmetic relationships between the modulation current and the optical modulation amplitude and the digital-to-analog converter debugging value respectively, it is deduced that the digital-to-analog converter is proportional to the optical modulation amplitude, and then: DAC 当前值 / DAC 目标值 =OMA 当前值 / OMA 目标值 ; Substituting the relationship between the optical modulation amplitude and the average optical power into the above formula, obtaining a relationship between the target value of the digital-to-analog converter and the extinction ratio target value and the current extinction ratio value of the optical module to be tested, which is used to calculate the target value of the digital-to-analog converter required for the next debugging, including: Based on the constructed relationship between the optical modulation amplitude and the average optical power and the extinction ratio formula, it is obtained that: Substituting into the proportional relationship formula, it is obtained that: Among them, DAC 当前值 represents the target value of the digital-to-analog converter obtained during the previous debugging, and DAC 目标值 represents the target value of the digital-to-analog converter required for the next debugging; OMA 当前值 represents the current value of the optical modulation amplitude, and OMA 目标值 represents the target value of the optical modulation amplitude, Er 当前值 represents the current value of the extinction ratio of the optical module under test read, and Er 目标值 represents the target value of the extinction ratio of the optical module under test set.

2. The adaptive step iterative extinction ratio debugging method for an optical module according to claim 1, wherein The constructing the relationship between the optical modulation amplitude and the average optical power based on the extinction ratio formula includes: The extinction ratio expression is: Er = 10log10(P1 / P0), where P1 represents the optical power of the high-level signal after modulation, and P0 represents the optical power of the low-level signal after modulation; The optical modulation amplitude expression is: OMA = P1 - P0; The average optical power expression is: P AVG = (P1 + P0) / 2; Then, by constructing the above expressions, the relationship between the optical modulation amplitude and the average optical power is obtained as:

3. The adaptive step iterative extinction ratio debugging method for an optical module according to claim 1, wherein The deducing that the digital-to-analog converter is proportional to the optical modulation amplitude based on the arithmetic relationships between the modulation current and the optical modulation amplitude and the digital-to-analog converter debugging value respectively includes: The optical modulation amplitude expression is: OMA = η * Imod; Among them, η is the slope of the electro-optic conversion curve of the optical module to be tested; Imod is the modulation current of the optical module to be tested, and its relationship with the digital-to-analog converter debugging value is: Imod = MOD_DAC * I, where I is the unit current constant value, and MOD_DAC is the debugging value of the digital-to-analog converter; Combining the two formulas and deducing to obtain the conclusion that the digital-to-analog converter is proportional to the optical modulation amplitude.

4. The adaptive step iterative extinction ratio debugging method for an optical module according to any one of claims 1-3, characterized in that The method further includes: Setting the debugging range of the digital-to-analog converter in the optical module to be tested; If the calculated target value of the digital-to-analog converter required for the next debugging is within the set debugging range of the digital-to-analog converter, then execute the step of writing the target value of the digital-to-analog converter into the register of the optical module to be tested; Otherwise, it is determined that the optical module to be tested has a defect and the extinction ratio debugging fails.

5. An extinction ratio debugging device for an optical module with adaptive step-by-step iteration, characterized in that, The device includes: A parameter setting module, configured to set the extinction ratio debugging range and the extinction ratio target value of the optical module under test, and set the initial debugging value of the digital-to-analog converter in the optical module under test; A parameter reading and writing module, configured to write the initial debugging value or the target value of the digital-to-analog converter into the register of the optical module under test, and read the current extinction ratio value of the optical module under test; A first determination module, configured to output a determination conclusion that the extinction ratio debugging of the optical module under test is qualified when the current extinction ratio value is within the set extinction ratio debugging range; A target value calculation module, configured to calculate the target value of the digital-to-analog converter required for the next debugging based on the extinction ratio target value and the current extinction ratio value of the optical module under test when the current extinction ratio value exceeds the set extinction ratio debugging range; Wherein, the target value calculation module further includes: A first relational expression construction unit, configured to construct a relational expression between the optical modulation amplitude and the average optical power based on the extinction ratio formula; A proportional relationship construction unit, which is used to establish a DAC based on the conclusion that the digital-to-analog converter is proportional to the optical modulation amplitude 当前值 / DAC 目标值 =OMA 当前值 / OMA 目标值 ; A second relational expression construction unit, configured to substitute the relational expression between the optical modulation amplitude and the average optical power into the proportional relational expression construction unit to obtain a relational expression between the target value of the digital-to-analog converter and the extinction ratio target value and the current extinction ratio value of the optical module under test, so as to calculate the target value of the digital-to-analog converter required for the next debugging, including: Based on the constructed relational expression between the optical modulation amplitude and the average optical power and the extinction ratio formula, it is obtained that: Substituting into the proportional relational expression, it is obtained that: Among them, DAC 当前值 represents the target value of the digital-to-analog converter obtained during the previous debugging, DAC 目标值 represents the target value of the digital-to-analog converter required for the next debugging; OMA 当前值 represents the current value of the optical modulation amplitude, OMA 目标值 represents the target value of the optical modulation amplitude, Er 当前值 represents the current value of the extinction ratio of the optical module under test read, Er 目标值 represents the target value of the extinction ratio of the optical module under test set.

6. The adaptive step iterative extinction ratio debugging device for an optical module according to claim 5, characterized in that The parameter setting module is further configured to set the debugging range of the digital-to-analog converter in the optical module under test, and the device further includes: A deployment module, configured to call the parameter reading and writing module when the target value of the digital-to-analog converter required for the next debugging calculated is within the set debugging range of the digital-to-analog converter; A second determination module, configured to output a conclusion that the optical module under test is determined to be defective and the extinction ratio debugging fails when the target value of the digital-to-analog converter required for the next debugging calculated exceeds the set debugging range of the digital-to-analog converter.

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