CN113328794B - Method and system for adjusting linearity based on PAM mode of optical module - Google Patents

Method and system for adjusting linearity based on PAM mode of optical module Download PDF

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CN113328794B
CN113328794B CN202110524088.7A CN202110524088A CN113328794B CN 113328794 B CN113328794 B CN 113328794B CN 202110524088 A CN202110524088 A CN 202110524088A CN 113328794 B CN113328794 B CN 113328794B
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邱金金
李林科
吴天书
杨现文
张健
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Wuhan Linktel Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
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Abstract

A PAM mode linearity adjusting method and system based on an optical module comprises setting Inner1 and Inner2 initial values of DSP to the optical module; reading the Level0-Level3 of the eye diagram of the optical module, and calculating the linearity of the eye diagram of the optical module; judging whether the linearity is in the range, and if so, stopping debugging; otherwise, performing step 4; calculating a linear coefficient a and an error b through Level0-Level3, Inner1 and Inner 2; back-calculating new Inner1 and Inner2 based on a and b and the required linearity, comparing initial Inner1 and Inner2, judging whether there is variation, such as no variation, introducing a minimum step value to synchronously adjust Inner1 and Inner2, and writing into the optical module; returning to step 2, iteration continues based on adjusted Inner1 and Inner2 until a linearity condition is satisfied.

Description

Method and system for adjusting linearity based on PAM mode of optical module
Technical Field
The invention relates to the technical field of optical communication and optical modules, in particular to a method and a system for adjusting linearity based on an optical module PAM mode.
Background
In an automatic optical module testing system, optical module debugging in a PAM (Pulse Amplitude Modulation) mode is involved, linearity is an index of an eye diagram, generally, the size of the eye diagram is adjusted by adjusting 2 register debugging parameters, i.e., Inner1 and Inner2 of a DSP, so as to achieve reasonable linearity, generally, Inner1 and Inner2 are adjusted synchronously by a certain step, but because an eye diagram test in the PAM mode has a long time, a target range cannot be quickly debugged in a step mode, and debugging time of each module is long, so that production efficiency is low.
Disclosure of Invention
In view of the technical defects and technical drawbacks in the prior art, embodiments of the present invention provide a method and a system for adjusting linearity based on an optical module PAM mode, which overcome or at least partially solve the above problems, and the specific scheme is as follows:
as a first aspect of the present invention, there is provided a linearity adjusting method based on an optical module PAM mode, the method including:
step 1, setting initial values of Inner1 and Inner2 of a DSP to an optical module;
step 2, reading the Level0, Level1, Level2 and Level3 of the optical module eye diagram, and calculating the linearity of the optical module eye diagram based on the Level0, Level1, Level2 and Level 3;
step 3, judging whether the linearity is in the range, and if so, stopping debugging; otherwise, performing the step 4;
step 4, calculating a linear coefficient a and an error b through Level0, Level1, Level2, Level3, Inner1 and Inner 2;
step 5, inversely calculating new Inner1 and Inner2 according to the linear coefficient a, the error b and the required linearity and the Level0, the Level1, the Level2 and the Level 3;
step 6 of comparing new Inner1 and Inner2 with initial Inner1 and Inner2, determining if there is a variation, if there is no variation, introducing a minimum step value, synchronously adjusting Inner1 and Inner2 by the minimum step value, writing new Inner1 and Inner2 in the optical module with adjusted Inner1 and Inner2 as new Inner1 and Inner 2;
step 7, returning to the step 2, continuing iteration based on the new Inner1 and Inner2 and the minimum stepping value until a linearity condition is met, and stopping debugging;
the Level0-Level3 respectively correspond to each Level displayed by the oscilloscope, and the inner1 and the inner2 are register debugging parameters of the DSP.
Further, the method further comprises the step of judging whether the minimum stepping value is within a threshold range, if the minimum stepping value is not within the threshold range and exceeds the upper limit of the threshold range, taking the upper limit of the threshold range as the minimum stepping value, and if the minimum stepping value is not within the threshold range and is lower than the lower limit of the threshold range, taking the lower limit of the threshold range as the minimum stepping value.
Further, in step 2, based on Level0, Level1, Level2, and Level3, a specific formula for calculating the linearity of the light module eye diagram is as follows:
Figure GDA0003728910900000021
wherein, V 0 、V 1 、V 2 And V 3 Each represents a voltage, i.e., the minimum of Level0, Level1, Level2, and Level3 displayed on the oscilloscope.
Further, in step 4, the linear coefficient a and the error b are calculated by Level0, Level1, Level2, Level3, lnner 1 and lnner 2 according to the following specific formula:
Figure GDA0003728910900000031
wherein Inner1_ last represents an initial value of Inner1, Inner2_ last represents an initial value of Inner2, V 1 、V 2 And (4) showing.
Further, in step 5, the new lnner 1 and lnner 2 specific formulas are inversely calculated according to the Level0, the Level1, the Level2 and the Level3 through the linear coefficient a, the error b and the required linearity as follows:
Figure GDA0003728910900000032
wherein Inner1_ new is back-calculated new Inner1, and Inner2_ new is back-calculated new Inner 2.
As a second aspect of the present invention, a system for adjusting linearity based on an optical module PAM mode is provided, where the system includes an initialization module, a first calculation module, a first judgment module, a second calculation module, a third calculation module, a second judgment module, and a debugging module;
the initialization module is used for setting initial values of Inner1 and Inner2 of the DSP to the optical module;
the first calculating module is used for reading the levels 0, 1, 2 and 3 of the eye diagrams of the optical modules, and calculating the linearity of the eye diagrams of the optical modules based on the levels 0, 1, 2 and 3;
the first judging module is used for judging whether the linearity is within a range, and if so, stopping debugging;
the second calculating module is used for calculating a linear coefficient a and an error b through Level0, Level1, Level2, Level3, Inner1 and Inner2 when the linearity is not in the range;
the third calculating module is used for inversely calculating new Inner1 and Inner2 according to the linear coefficient a, the error b and the required linearity and according to the Level0, the Level1, the Level2 and the Level 3;
said second decision module for comparing new Inner1 and Inner2 with initial Inner1 and Inner2, deciding if there is a change, if there is no change, introducing a minimum step value to adjust Inner1 and Inner2 synchronously, writing adjusted Inner1 and Inner2 into the optical module;
the debugging module is used for calling the first calculation module, continuing iteration based on the adjusted Inner1 and Inner2 and the minimum stepping value until the linearity condition is met, and stopping debugging;
the Level0-Level3 respectively correspond to each Level displayed by the oscilloscope, and the inner1 and the inner2 are register debugging parameters of the DSP.
Further, the second determining module is further configured to: and judging whether the minimum stepping value is within a threshold range, if the minimum stepping value is not within the threshold range and exceeds the upper limit of the threshold range, taking the upper limit of the threshold range as the minimum stepping value, and if the minimum stepping value is not within the threshold range and is lower than the lower limit of the threshold range, taking the lower limit of the threshold range as the minimum stepping value.
Further, based on Level0, Level1, Level2 and Level3, a specific formula for calculating the linearity of the light module eye diagram is as follows:
Figure GDA0003728910900000041
wherein, V 0 、V 1 、V 2 And V 3 Each represents a voltage, i.e., the minimum of Level0, Level1, Level2, and Level3 displayed on the oscilloscope.
Further, the linear coefficient a and the error b are calculated by Level0, Level1, Level2, Level3, Inner1 and Inner2 according to the following specific formula:
Figure GDA0003728910900000042
wherein Inner1_ last represents an initial value of Inner1, Inner2_ last represents an initial value of Inner2, V 1 、V 2 And (4) showing.
Further, the new Inner1 and Inner2 specific formulas are inversely calculated according to the Level0, the Level1, the Level2 and the Level3 through the linear coefficient a, the error b and the required linearity as follows:
Figure GDA0003728910900000043
wherein Inner1_ new is back-calculated new Inner1, and Inner2_ new is back-calculated new Inner 2.
The invention has the following beneficial effects:
the invention provides a linearity adjusting method and system based on an optical module PAM mode, firstly, the linearity is obtained by the relation among 4 parameters of Level0, Level1, Level2 and Level3 of an eye diagram, and the linearity is determined by the minimum difference of the 4 parameters, because 2 parameters of Inner1 and Inner2 of a DSP and Level1 and Level2 of the eye diagram form an approximate linear relation, a fitting mode can be adopted, 4 parameter quantities of Level0, Level1, Level2 and Level3 read by communicating with an oscilloscope are used, an approximate linear curve is fitted according to the set Inner 8 and Inner2 and a preset linear (degree) curve is fitted based on the fit method, then a required inverse Level relation 0, Level1, Inner2 and Level 4684 are calculated according to a target linearity index, a formula is deduced, and a required solution is obtained according to the least square 4642, 2 and 4684 of the least square 4629 relation between the Level 3945 and the required Level is fitted according to the target linearity index, Inner2, which can not make Inner1 and Inner2 out of range, finally setting Inner1 and Inner2 into the module, then reading in refresh, and returning to iteration, and finally ensuring the linearity index of the module eye diagram to reach the preset value.
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FIG. 1 is a diagram illustrating a linearity calculation according to an embodiment of the present invention;
fig. 2 is a flowchart of a linearity adjustment method based on an optical module PAM mode according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
At present, the 2 parameters of Inner1 and Inner2 are adjusted step by step in a conventional debugging mode, but because the eye pattern testing efficiency in a PAM mode is very low and the time is very long, the debugging period is very long, and the production efficiency is very low, the invention provides a quick debugging mode, which greatly shortens the debugging period and further improves the production efficiency. FIG. 1 is a linearity calculation diagram, and it can be seen from the diagram that the index of linearity is calculated by the ratio of eye diagrams, and is the difference between levels, wherein V0-V3 are voltages, i.e. the minimum values of Level0, Level1, Level2 and Level3 displayed on an oscilloscope, V0 is the minimum value of Level0, V3 is the minimum value of Level3, the smaller the difference between levels is, the closer the linearity is to the limit 1, and the linearity is determined by the ratio between levels, therefore, as long as the sizes of Level1 and Level2 are adjusted, the size of linearity can be basically satisfied.
As shown in fig. 2, a flowchart of a linearity adjusting method based on an optical module PAM mode provided in this embodiment is shown, where the method includes the following steps:
step 1, setting initial values of Inner1 and Inner2 of a DSP to an optical module;
step 2, reading the Level0, Level1, Level2 and Level3 of the optical module eye diagram, and calculating the linearity of the optical module eye diagram based on the Level0, Level1, Level2 and Level3, wherein the specific formula is as follows:
Figure GDA0003728910900000061
that is, the linearity of the eye diagram is the minimum voltage difference divided by the average voltage difference;
step 3, judging whether the linearity is in the range, and if so, stopping debugging; otherwise, go to step 4, where the range is determined by the index given to the customer;
step 4, calculating a linear coefficient a and an error b through Level0, Level1, Level2, Level3, Inner1 and Inner2, wherein the specific formula is as follows:
Figure GDA0003728910900000062
where Inner1_ last represents an initial value of Inner1, and Inner2_ last represents an initial value of Inner 2.
Step 5, inversely calculating new Inner1 and Inner2 according to the linear coefficient a, the error b and the required linearity and according to the Level0, the Level1, the Level2 and the Level3, wherein the specific formula is as follows:
Inner1_new≈a，(V3+2V0)/3+b
Inner2_new≈a*(2V3+V0)/3+b
as can be seen from the formulas, the linearity can be adjusted as long as the ratio of Level1 to Level2 is adjusted, because Inner1 and Inner2 in a DSP generally affect Level1 and Level2, it can be approximately understood that Inner1 and Inner2 are in an approximate linear relationship with Level1 and Level2, and the change directions are consistent, at this time, a linear coefficient a and an error b are introduced, a and b can be calculated by means of fitting according to the specific values of Level0, Level1, Level2, Level3, Inner1 and Inner2, and then new Inner1 and Inner2 can be deduced reversely according to the target linearity.
Step 6 of comparing new Inner1 and Inner2 with initial Inner1 and Inner2, determining if there is a variation, if there is no variation, introducing a minimum step value to adjust Inner1 and Inner2 synchronously, writing adjusted Inner1 and Inner2 into the optical module, wherein the introduced minimum step value is determined by the performance of the module;
and 7, returning to the step 2, continuing to iterate based on the adjusted Inner1 and Inner2 and the minimum stepping value until a linearity condition is met, and stopping debugging.
And if the minimum stepping value is not in the threshold range and is lower than the lower limit of the threshold range, the lower limit of the threshold range is taken as the minimum stepping value.
The invention provides a linearity adjusting method and system based on an optical module PAM mode, firstly, the linearity is obtained by the relation among 4 parameters of Level0, Level1, Level2 and Level3 of an eye diagram, the linearity is determined by the minimum difference of the 4 parameters, because 2 parameters of Inner1 and Inner2 of a DSP and the Level1 and the Level2 of the eye diagram form an approximate linear relation, a fitting mode can be adopted, an approximate linear curve is fitted according to the set Inner 8 and Inner2 by communicating with an oscilloscope, an approximate linear (degree) curve is fitted based on the Level0, Level1, Level2 and Level3, an approximate linear (degree) curve is fitted, a required least square fitting relation among Level0, 686 27, Level2 and Invel 4684 is calculated by a linear calculation formula according to a target linearity index, the required least square fitting relation is worked out according to the size of the preset linear (degree) curve, and the required least square fitting relation is worked out according to the Level 4642 and 4684, the Level1 and the required degree of the preset linear (the Level) curve is worked out, Inner2, which can not make Inner1 and Inner2 out of range, finally setting Inner1 and Inner2 into the module, then reading in refresh, and returning to iteration, and finally ensuring the linearity index of the module eye diagram to reach the preset value.
As another embodiment of the present invention, a system for adjusting linearity based on an optical module PAM mode is further provided, where the system includes an initialization module, a first calculation module, a first judgment module, a second calculation module, a third calculation module, a second judgment module, and a debugging module;
the initialization module is used for setting initial values of Inner1 and Inner2 of the DSP to the optical module;
the first calculating module is used for reading the Level0, the Level1, the Level2 and the Level3 of the eye diagram of the optical module, and calculating the linearity of the eye diagram of the optical module based on the Level0, the Level1, the Level2 and the Level 3;
the first judging module is used for judging whether the linearity is in a range, and if so, stopping debugging;
the second calculating module is used for calculating a linear coefficient a and an error b through Level0, Level1, Level2, Level3, Inner1 and Inner2 when the linearity is not in the range;
the third calculating module is used for inversely calculating new Inner1 and Inner2 according to the linear coefficient a, the error b and the required linearity and according to the Level0, the Level1, the Level2 and the Level 3;
said second decision module for comparing new Inner1 and Inner2 with initial Inner1 and Inner2, deciding if there is a change, if there is no change, introducing a minimum step value to adjust Inner1 and Inner2 synchronously, writing adjusted Inner1 and Inner2 into the optical module;
the debugging module is used for calling the first calculation module, continuing iteration based on the adjusted Inner1 and Inner2 and the minimum stepping value until a linearity condition is met, and stopping debugging;
wherein, Level0-Level3 respectively correspond to each Level displayed by the oscilloscope, and inner1 and inner2 are register debugging parameters of the DSP;
wherein the second judging module is further configured to: and judging whether the minimum stepping value is within a threshold range, if the minimum stepping value is not within the threshold range and exceeds the upper limit of the threshold range, taking the upper limit of the threshold range as the minimum stepping value, and if the minimum stepping value is not within the threshold range and is lower than the lower limit of the threshold range, taking the lower limit of the threshold range as the minimum stepping value.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (6)

1. A linearity adjusting method based on an optical module PAM mode is characterized by comprising the following steps:
step 1, setting initial values Inner1 and Inner2 of a DSP to an optical module;
step 2, reading the Level0, Level1, Level2 and Level3 of the optical module eye diagram, and calculating the linearity of the optical module eye diagram based on the Level0, Level1, Level2 and Level 3;
step 3, judging whether the linearity is in the range, and if so, stopping debugging; otherwise, performing step 4;
step 4, calculating a linear coefficient a and an error b through Level0, Level1, Level2, Level3, Inner1 and Inner 2;
step 5, inversely calculating new Inner1 and Inner2 according to the linear coefficient a, the error b and the required linearity and the Level0, the Level1, the Level2 and the Level 3;
step 6 comparing new Inner1 and Inner2 with initial Inner1 and Inner2, determining if there is a change, if there is no change, introducing a minimum step value to adjust Inner1 and Inner2 synchronously, writing adjusted Inner1 and Inner2 in the optical module;
step 7, returning to the step 2, continuing iteration based on the adjusted Inner1 and Inner2 and the minimum stepping value until a linearity condition is met, and stopping debugging;
in step 4, the specific formulas of the linear coefficient a and the error b are calculated through Level0, Level1, Level2, Level3, Inner1 and Inner2 as follows:
Figure FDA0003728910890000011
wherein Inner1_ last represents an initial value of Inner1, and Inner2_ last represents an initial value of Inner 2;
in step 5, the new lnner 1 and lnner 2 specific formulas are inversely calculated according to the Level0, the Level1, the Level2 and the Level3 through the linear coefficient a, the error b and the required linearity as follows:
Figure FDA0003728910890000021
wherein Inner1_ new is the back-calculated new Inner1, Inner2_ new is the back-calculated new Inner 2;
wherein, Level0-Level3 respectively correspond to each Level displayed by the oscilloscope, and inner1 and inner2 are register debugging parameters of the DSP;
wherein, V0, V1, V2 and V3 each represent a voltage, that is, the minimum value of Level0, Level1, Level2 and Level3 displayed on the oscilloscope.
2. The method for adjusting linearity based on the PAM mode of the optical module according to claim 1, further comprising determining whether a minimum step value is within a threshold range, taking an upper limit of the threshold range as the minimum step value if the minimum step value is not within the threshold range and exceeds an upper limit of the threshold range, and taking a lower limit of the threshold range as the minimum step value if the minimum step value is not within the threshold range and is lower than a lower limit of the threshold range.
3. The method according to claim 1, wherein in step 2, based on Level0, Level1, Level2, and Level3, the specific formula for calculating the linearity of the optical module eye diagram is as follows:
Figure FDA0003728910890000022
wherein, V 0 、V 1 、V 2 And V 3 Each represents a voltage, i.e., the minimum of Level0, Level1, Level2, and Level3 displayed on the oscilloscope.
4. A system based on PAM mode linearity adjustment of an optical module is characterized by comprising an initialization module, a first calculation module, a first judgment module, a second calculation module, a third calculation module, a second judgment module and a debugging module;
the initialization module is used for setting initial values of Inner1 and Inner2 of the DSP to the optical module;
the first calculating module is used for reading the Level0, the Level1, the Level2 and the Level3 of the eye diagram of the optical module, and calculating the linearity of the eye diagram of the optical module based on the Level0, the Level1, the Level2 and the Level 3;
the first judging module is used for judging whether the linearity is in a range, and if so, stopping debugging;
the second calculating module is used for calculating a linear coefficient a and an error b through Level0, Level1, Level2, Level3, Inner1 and Inner2 when the linearity is not in the range;
the third calculating module is used for inversely calculating new Inner1 and Inner2 according to the linear coefficient a, the error b and the required linearity and according to the Level0, the Level1, the Level2 and the Level 3;
said second decision module for comparing new Inner1 and Inner2 with initial Inner1 and Inner2, deciding if there is a change, if there is no change, introducing a minimum step value to synchronously adjust Inner1 and Inner2, writing adjusted Inner1 and Inner2 into the optical module;
the debugging module is used for calling the first calculation module, continuing iteration based on the adjusted Inner1 and Inner2 and the minimum stepping value until the linearity condition is met, and stopping debugging;
the specific formulas of the linear coefficient a and the error b are calculated through Level0, Level1, Level2, Level3, Inner1 and Inner2 as follows:
Figure FDA0003728910890000031
wherein Inner1_ last represents an initial value of Inner1, Inner2_ last represents an initial value of Inner 2;
the new Inner1 and Inner2 specific formulas are inversely calculated according to the Level0, the Level1, the Level2 and the Level3 through the linear coefficient a, the error b and the required linearity as follows:
Figure FDA0003728910890000032
wherein Inner1_ new is the back-calculated new Inner1, Inner2_ new is the back-calculated new Inner2
Wherein, Level0-Level3 respectively correspond to each Level displayed by the oscilloscope, and inner1 and inner2 are register debugging parameters of the DSP;
where V0, V1, V2, and V3 each represent a voltage, that is, the minimum value of Level0, Level1, Level2, and Level3 displayed on the oscilloscope.
5. The system for adjusting linearity of PAM mode of optical module according to claim 4, wherein the second determining module is further configured to: and judging whether the minimum stepping value is within a threshold range, if the minimum stepping value is not within the threshold range and exceeds the upper limit of the threshold range, taking the upper limit of the threshold range as the minimum stepping value, and if the minimum stepping value is not within the threshold range and is lower than the lower limit of the threshold range, taking the lower limit of the threshold range as the minimum stepping value.
6. The system according to claim 4, wherein based on Level0, Level1, Level2, and Level3, the specific formula for calculating the linearity of the PAM mode for the light module eye diagram is as follows:
Figure FDA0003728910890000041
wherein, V 0 、V 1 、V 2 And V 3 Each represents a voltage, i.e., the minimum of Level0, Level1, Level2, and Level3 displayed on the oscilloscope.
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