CN112346242B - Method and device for quickly and automatically adjusting transmission eye pattern parameters of optical module - Google Patents

Method and device for quickly and automatically adjusting transmission eye pattern parameters of optical module Download PDF

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CN112346242B
CN112346242B CN202011405667.1A CN202011405667A CN112346242B CN 112346242 B CN112346242 B CN 112346242B CN 202011405667 A CN202011405667 A CN 202011405667A CN 112346242 B CN112346242 B CN 112346242B
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optical module
eye pattern
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叶飞
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Yangtze Optical Fibre and Cable Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/0012—Optical design, e.g. procedures, algorithms, optimisation routines
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4286—Optical modules with optical power monitoring

Abstract

The invention discloses a method and a device for quickly and automatically adjusting the transmission eye pattern parameters of an optical module, belonging to the field of intelligent manufacturing of the optical module.A functional relation between the eye pattern parameters to be adjusted and the eye pattern adjustment target parameters is obtained from the physical characteristics of the optical module; then collecting the current value of each eye pattern parameter to be adjusted, combining the current value of the eye pattern adjustment target parameter obtained by testing, and solving the functional relation to obtain the value of a undetermined coefficient in the functional relation; and finally, solving the functional relation through specific values to which the eye pattern adjustment target parameters need to be adjusted based on the undetermined coefficient values to obtain the eye pattern parameter values to be adjusted. The method can quickly obtain the required eye pattern parameters from the physical characteristics of the optical module and the optical device through a physical formula and mathematical calculation. According to the invention, the PIV parameters of the optical device do not need to be measured in advance, and the PIV curve data of the optical device does not need to be obtained in advance.

Description

Method and device for quickly and automatically adjusting transmission eye pattern parameters of optical module
Technical Field
The invention belongs to the field of intelligent manufacturing of optical modules, and particularly relates to a method and a device for quickly and automatically adjusting parameters of a transmitting eye diagram of an optical module.
Background
When the optical module is manufactured, eye pattern parameters including emitted light power, extinction ratio, eye pattern allowance, cross points and the like need to be adjusted and tested to reach a protocol standard and a factory internal control index. Traditional adjustment methods include manual adjustment by staff and less efficient approaches. The manual adjustment of staff is not only low in speed but also stable in process without automatic software adjustment, and has hidden quality danger. The approximation method is similar to the enumeration method, and for the condition that the bias current needs to be adjusted, the modulation current needs to be adjusted for multiple times to obtain the desired eye pattern adjustment result, and the problems that the adjustment speed is slow, the process is unstable, and the qualified module cannot be ensured to be automatically adjusted certainly exist.
Disclosure of Invention
Aiming at the defects or improvement requirements in the prior art, the invention provides a method and a device for quickly and automatically adjusting the transmission eye pattern parameters of an optical module, which can quickly obtain the required eye pattern parameters through a physical formula and mathematical calculation on the physical characteristics of the optical module and an optical device, do not need to measure the PIV parameters of the optical device in advance, do not need to obtain the PIV curve data of the optical device in advance, and can be suitable for various occasions.
To achieve the above object, according to an aspect of the present invention, there is provided a method for fast and automatically adjusting a transmission eye pattern parameter of an optical module, including:
obtaining a functional relation model between the parameters of the eye pattern to be adjusted and the parameters of the eye pattern adjustment target from the physical characteristics of the optical module;
collecting current values of the eye pattern parameters to be adjusted, combining the eye pattern adjustment target parameter current values obtained through testing, inputting the functional relation model, and solving to obtain undetermined coefficient values in the functional relation model;
and solving the functional relation model through the specific value to which the eye pattern adjustment target parameter needs to be adjusted based on the undetermined coefficient value to obtain the value of the eye pattern parameter to be adjusted.
In some optional embodiments, when the optical module is a smaller than 10G optical module, for the directly modulated optical module, the functional relationship model between the eye diagram parameter to be adjusted and the eye diagram adjustment target parameter is:
Figure BDA0002814053370000021
wherein E isrRepresents the extinction ratio of the optical module, IbIs the bias current of the optical module, ImIs the modulation current of the optical module, IthIs the threshold current of the light module.
In some optional embodiments, when the optical module is an optical module smaller than 10G, the obtaining, from the physical characteristics of the optical module, a functional relationship model between an eye diagram parameter to be adjusted and an eye diagram adjustment target parameter includes:
for a directly modulated optical module, logic 1 corresponds to an optical power P1 as: p1 ═ Ib+Im-Ith) Eta, wherein, IbIs the bias current of the optical module, ImIs the modulation current of the optical module, IthIs the threshold current of the optical module, and η is the photoelectric conversion efficiency of the optical module;
logic 0 corresponds to an optical power P0 of: p0 ═ Ib-Ith) η, therefore, the average output optical power of the optical module is: pAve(P1+ P0)/2, the extinction ratio of the optical module is:
Figure BDA0002814053370000022
in some optional embodiments, when the optical module is a smaller than 10G optical module, for the external modulation optical module, the functional relationship model between the eye diagram parameter to be adjusted and the eye diagram adjustment target parameter is:
Figure BDA0002814053370000023
wherein E isrRepresents the extinction ratio of the optical module, IbIs the bias current of the optical module, ImIs the modulation current of the optical module, IthIs the threshold current of the light module.
In some optional embodiments, when the optical module is an optical module smaller than 10G, the obtaining, from the physical characteristics of the optical module, a functional relationship model between an eye diagram parameter to be adjusted and an eye diagram adjustment target parameter includes:
for the external modulation optical module, logic 1 corresponds to an optical power P1 as:
Figure BDA0002814053370000031
wherein, IbIs the bias current of the optical module, ImIs the modulation current of the optical module, IthIs the threshold current of the optical module, and η is the photoelectric conversion efficiency of the optical module;
logic 0 corresponds to an optical power P0 of:
Figure BDA0002814053370000032
therefore, the average output optical power of the optical module is: pAve(P1+ P0)/2, the extinction ratio of the optical module is:
Figure BDA0002814053370000033
in some optional implementations, when the optical module is an optical module of more than 10G, the functional relationship model between the eye diagram parameter to be adjusted and the eye diagram adjustment target parameter is:
Figure BDA0002814053370000034
wherein A is1To AnTo adjust the eye parameters, B11To BnmTo be a coefficient of undetermination, C1To CmTarget parameters are adjusted for the eye diagram.
In some alternative embodiments, in B11To BnmIs a primary function F11(x) To Fnm(x) If the to-be-adjusted eye pattern parameter is not in a linear function relationship with the eye pattern adjustment target parameter, the function relationship model between the to-be-adjusted eye pattern parameter and the eye pattern adjustment target parameter is as follows:
Figure BDA0002814053370000035
according to another aspect of the present invention, there is provided an apparatus for fast and automatically adjusting a transmission eye pattern parameter of a light module, including:
the corresponding relation determining module is used for obtaining a functional relation model between the eye pattern parameters to be adjusted and the eye pattern adjustment target parameters from the physical characteristics of the optical module;
the coefficient solving module is used for acquiring the current value of each eye pattern parameter to be adjusted, combining the current value of the eye pattern adjustment target parameter obtained by testing, inputting the functional relation model and solving to obtain the value of the undetermined coefficient in the functional relation model;
and the parameter adjusting module is used for solving the function relation model through the specific value to which the eye pattern adjusting target parameter needs to be adjusted based on the undetermined coefficient value to obtain the value of the eye pattern parameter to be adjusted.
In some optional embodiments, when the optical module is a smaller than 10G optical module, for the directly modulated optical module, the functional relationship model between the eye diagram parameter to be adjusted and the eye diagram adjustment target parameter is:
Figure BDA0002814053370000041
wherein E isrRepresents the extinction ratio of the optical module, IbIs the bias current of the optical module, ImIs the modulation current of the optical module, IthIs the threshold current of the light module.
In some optional embodiments, when the optical module is a smaller than 10G optical module, for the external modulation optical module, the functional relationship model between the eye diagram parameter to be adjusted and the eye diagram adjustment target parameter is:
Figure BDA0002814053370000042
wherein E isrRepresents the extinction ratio of the optical module, IbIs the bias current of the optical module, ImIs the modulation current of the optical module, IthIs the threshold current of the light module.
In some optional embodiments, when the optical module is a smaller than 10G optical module, the correspondence determining module is configured to, for the direct modulation optical module, determine the logical 1 corresponding optical power P1 as: p1 ═ Ib+Im-Ith) Eta, wherein, IbIs the bias current of the optical module, ImIs the modulation current of the optical module, IthIs the threshold current of the optical module, and η is the photoelectric conversion efficiency of the optical module;
logic 0 corresponds to an optical power P0 of: p0 ═ Ib-Ith) η, therefore, the average output optical power of the optical module is: pAve＝(P1+ P0)/2, the extinction ratio of the optical module is:
Figure BDA0002814053370000043
in some optional embodiments, when the optical module is a smaller than 10G optical module, the correspondence determining module is configured to, for the external modulation optical module, determine that the optical power P1 corresponding to logic 1 is:
Figure BDA0002814053370000044
wherein, IbIs the bias current of the optical module, ImIs the modulation current of the optical module, IthIs the threshold current of the optical module, and η is the photoelectric conversion efficiency of the optical module; logic 0 corresponds to an optical power P0 of:
Figure BDA0002814053370000045
therefore, the average output optical power of the optical module is: pAve(P1+ P0)/2, the extinction ratio of the optical module is:
Figure BDA0002814053370000046
in some optional implementations, when the optical module is an optical module of more than 10G, the functional relationship model between the eye diagram parameter to be adjusted and the eye diagram adjustment target parameter is:
Figure BDA0002814053370000051
wherein A is1To AnTo adjust the eye parameters, B11To BnmTo be a coefficient of undetermination, C1To CmTarget parameters are adjusted for the eye diagram.
In some alternative embodiments, in B11To BnmIs a primary function F11(x) To Fnm(x) If the to-be-adjusted eye pattern parameter is not in a linear function relationship with the eye pattern adjustment target parameter, the function relationship model between the to-be-adjusted eye pattern parameter and the eye pattern adjustment target parameter is as follows:
Figure BDA0002814053370000052
in general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
the adjusting method provided by the invention only needs one-time test and one-time adjustment, not only has high adjusting speed, but also is more accurate than a common approximation method, and has higher success rate. For different kinds of optical modules: SFP \ SFP + \ PON \ QSFP \ CFP \ CFP2\ CFP4 and the like have strong practicability, and as the adjusting method does not need to carry out PIV test on the optical device in advance, compared with the traditional mode that the PIV test needs to be carried out in advance, the adjusting method is simpler and more convenient and is easier to realize. Meanwhile, because the invention does not need to add additional hardware or equipment, the implementation cost is lower.
Drawings
Fig. 1 is a schematic flowchart of a method for quickly and automatically adjusting a transmission eye diagram parameter of an optical module according to an embodiment of the present invention;
FIG. 2 is a current-power curve of a directly modulated laser according to an embodiment of the present invention;
fig. 3 is a current-power curve of an externally modulated laser according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Fig. 1 is a schematic flow chart of a method for quickly and automatically adjusting a transmission eye diagram parameter of an optical module according to an embodiment of the present invention, where the method shown in fig. 1 includes the following steps:
s1: obtaining a functional relation model between the parameters of the eye pattern to be adjusted and the parameters of the eye pattern adjustment target from the physical characteristics of the optical module;
s2: collecting current values of the eye pattern parameters to be adjusted, combining the eye pattern adjustment target parameter current values obtained through testing, inputting a functional relation model, and solving to obtain undetermined coefficient values in the functional relation model;
s3: and solving the functional relation model through the specific value to which the eye pattern adjustment target parameter needs to be adjusted based on the value of the undetermined coefficient to obtain the value of the eye pattern parameter to be adjusted.
Example one
In the embodiment of the invention, a method for adjusting the optical power, the extinction ratio and the eye pattern of a PIV curve adjusting module based on a semiconductor laser diode is provided.
The general shape of the PIV curve for a semiconductor laser diode fabricated with a digitally modulated optical module is shown in fig. 2:
the optical module shown in fig. 2 is a Direct modulation optical module, and for the Direct modulation optical module, the optical power P1 corresponding to logic 1 can be calculated by the following formula:
P1＝(Ib+Im-Ith)η (1)
in the formula (1), IbIs the bias current of the optical module, ImIs the modulation current of the optical module, IthIs the threshold current of the optical module, and η is the photoelectric conversion efficiency of the optical module. The same logical 0 corresponding optical power P0 can be obtained by the following equation:
P0＝(Ib-Ith)η (2)
average output optical power of optical module:
PAve＝(P1+P0)/2 (3)
extinction ratio of the optical module:
Figure BDA0002814053370000071
the following can be obtained by the above (1), (2), (3) and (4):
Figure BDA0002814053370000072
for a certain actual optical module and matched optical device, IthIs a constant value. The extinction ratio is adjusted at the bias current IbThe adjustment is performed with fixation. An I can be obtained by the formula (5)mAnd the extinction ratio can be determined by a known Im1And E measured on eye chart apparatusr1Calculating I in the relation functionb-Ith. Thus, the extinction ratio is adjusted to a target value Er2The modulation current I required to be set can be quickly calculated by the formula (5)m。
Among them, the above formula is slightly different for an External Modulation (External Modulation) optical module. But the principles and processes of the calculations are exactly the same. For the outer modulation light module, as shown in FIG. 3, the above formula is updated with the suffix-2:
Figure BDA0002814053370000073
Figure BDA0002814053370000074
(3) and (4) the out-of-formula modulation optical module and the direct modulation optical module are the same. From the above, (5) -2:
Figure BDA0002814053370000075
for the external modulation module, the subsequent extinction ratio adjustment method is the same as that of the direct modulation optical module. Only the corresponding formulas are differentiated.
Example two
On the basis of the first embodiment, the derived eye diagram adjustment method for the more complex optical module may not be applicable to the adjustment method described in the first embodiment in many cases for the high-speed module above 10G. The reason is that the module above 10G has requirements on not only the optical power and the extinction ratio during the adjustment of the eye pattern, but also the parameters such as the cross point, the eye pattern margin, the OMA and the like. The adjustment parameters are not limited to the modulation current and the bias current, but the eye diagram parameters are influenced by the adjustment parameters such as the modulation current and the bias current. The specific value of the parameter to be adjusted cannot be calculated by a single formula. One can construct a function matrix as follows:
Figure BDA0002814053370000081
in the above formula (6), A11To AnmAre all parameters to be adjusted (e.g. bias current and modulation current), B11To BnmAre all undetermined coefficients (e.g. I in embodiment one)b-Ith)，C1To CnAre eye diagram adjustment target parameters (e.g., optical power, extinction ratio). The undetermined coefficient B can be calculated by solving the equation form according to the data acquired by the system11To Bnm. Then, A is obtained by calculating the specific value of the target parameter11To Anm。
It should be noted that, in the embodiment of the present invention, the relationship between all the parameters to be adjusted and the target parameter is set as a linear function relationship by default. It is possible that equation (6) does not apply to practical physical models, such as where the extinction ratio and modulation current are logarithmically related. In this case, the actual physical models of the driving chip used in the optical module and the photoelectric chip can be considered in detail, and mathematical modeling can be performed by using an appropriate functional relationship. Equation (6) can now be replaced with equation (7) below:
Figure BDA0002814053370000082
f in the above formulanm(x) The elementary function representing a certain physical model after mathematical modeling can be an exponential or logarithmic function, such as let F11(x)＝b11log10(x)，Fnm(x)＝bnmlog10(x)，b11To bnmAre coefficients.
Wherein the function F in the above formulanm(x) The specific form can refer to the laser drive IC manufacturer index book and the specific optical module hardware and firmware design, and the embodiment of the invention is not limited uniquely.
EXAMPLE III
The application also provides a device for rapidly and automatically adjusting the parameters of the transmitting eye diagram of the optical module, which comprises:
the corresponding relation determining module is used for obtaining a functional relation model between the eye pattern parameters to be adjusted and the eye pattern adjustment target parameters from the physical characteristics of the optical module;
the coefficient solving module is used for acquiring the current value of each eye pattern parameter to be adjusted, combining the current value of the eye pattern adjustment target parameter obtained by testing, inputting the functional relation model and solving to obtain the value of the undetermined coefficient in the functional relation model;
and the parameter adjusting module is used for solving the function relation model through the specific value to which the eye pattern adjusting target parameter needs to be adjusted based on the undetermined coefficient value to obtain the value of the eye pattern parameter to be adjusted.
In some optional embodiments, when the optical module is a smaller than 10G optical module, for the directly modulated optical module, the functional relationship model between the eye diagram parameter to be adjusted and the eye diagram adjustment target parameter is:
Figure BDA0002814053370000091
wherein E isrRepresents the extinction ratio of the optical module, IbIs the bias current of the optical module, ImIs the modulation current of the optical module, IthIs the threshold current of the light module.
In some optional embodiments, when the optical module is a smaller than 10G optical module, for the external modulation optical module, the functional relationship model between the eye diagram parameter to be adjusted and the eye diagram adjustment target parameter is:
Figure BDA0002814053370000092
wherein E isrRepresents the extinction ratio of the optical module, IbIs the bias current of the optical module, ImIs the modulation current of the optical module, IthIs the threshold current of the light module.
In some optional embodiments, when the optical module is a smaller than 10G optical module, the correspondence determining module is configured to, for the direct modulation optical module, determine the logical 1 corresponding optical power P1 as: p1 ═ Ib+Im-Ith) Eta, wherein, IbIs the bias current of the optical module, ImIs the modulation current of the optical module, IthIs the threshold current of the optical module, and η is the photoelectric conversion efficiency of the optical module;
logic 0 corresponds to an optical power P0 of: p0 ═ Ib-Ith) η, therefore, the average output optical power of the optical module is: pAve(P1+ P0)/2, the extinction ratio of the optical module is:
Figure BDA0002814053370000093
in some optional embodiments, when the optical module is a smaller than 10G optical module, the correspondence determining module is configured to, for the external modulation optical module, determine that the optical power P1 corresponding to logic 1 is:
Figure BDA0002814053370000101
wherein, IbIs the bias current of the optical module, ImIs the modulation current of the optical module, IthIs the threshold current of the optical module, and η is the photoelectric conversion efficiency of the optical module; logic 0 corresponds to an optical power P0 of:
Figure BDA0002814053370000102
therefore, the average output optical power of the optical module is: pAve(P1+ P0)/2, the extinction ratio of the optical module is:
Figure BDA0002814053370000103
in some optional implementations, when the optical module is an optical module of more than 10G, the functional relationship model between the eye diagram parameter to be adjusted and the eye diagram adjustment target parameter is:
Figure BDA0002814053370000104
wherein A is1To AnTo adjust the eye parameters, B11To BnmTo be a coefficient of undetermination, C1To CmTarget parameters are adjusted for the eye diagram.
In some alternative embodiments, in B11To BnmIs a primary function F11(x) To Fnm(x) If the to-be-adjusted eye pattern parameter is not in a linear function relationship with the eye pattern adjustment target parameter, the function relationship model between the to-be-adjusted eye pattern parameter and the eye pattern adjustment target parameter is as follows:
Figure BDA0002814053370000105
it should be noted that, according to the implementation requirement, each step/component described in the present application can be divided into more steps/components, and two or more steps/components or partial operations of the steps/components can be combined into new steps/components to achieve the purpose of the present invention.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (6)

1. A method for quickly and automatically adjusting the parameters of a transmitting eye pattern of an optical module is characterized by comprising the following steps:
obtaining a functional relation model between the parameters of the eye pattern to be adjusted and the parameters of the eye pattern adjustment target from the physical characteristics of the optical module;
when the optical module is an optical module smaller than 10G, for the directly modulated optical module, the functional relationship model between the parameters of the eye pattern to be adjusted and the parameters of the eye pattern adjustment target is as follows:
Figure FDA0002998314300000011
wherein E isrRepresents the extinction ratio of the optical module, IbIs the bias current of the optical module, ImIs the modulation current of the optical module, IthIs the threshold current of the optical module;
when the optical module is an optical module smaller than 10G, for the external modulation optical module, the functional relationship model between the parameters of the eye pattern to be adjusted and the target parameters of the eye pattern adjustment is as follows:
Figure FDA0002998314300000012
wherein E isrRepresents the extinction ratio of the optical module, IbIs the bias current of the optical module, ImIs the modulation current of the optical module, IthIs the threshold current of the optical module;
when the optical module is an optical module of more than 10G, the functional relationship model between the parameters of the eye pattern to be adjusted and the target parameters of the eye pattern adjustment is as follows:
Figure FDA0002998314300000013
wherein A is1To AnTo adjust the eye parameters, B11To BnmTo be a coefficient of undetermination, C1To CmAdjusting a target parameter for the eye diagram;
collecting current values of the eye pattern parameters to be adjusted, combining the eye pattern adjustment target parameter current values obtained through testing, inputting the functional relation model, and solving to obtain undetermined coefficient values in the functional relation model;
and solving the functional relation model through the specific value to which the eye pattern adjustment target parameter needs to be adjusted based on the undetermined coefficient value to obtain the value of the eye pattern parameter to be adjusted.
2. The method according to claim 1, wherein when the optical module is a smaller than 10G optical module, obtaining a functional relationship model between the eye pattern parameter to be adjusted and the eye pattern adjustment target parameter from the physical characteristics of the optical module comprises:
for a directly modulated optical module, logic 1 corresponds to an optical power P1 as: p1 ═ Ib+Im-Ith) Eta, wherein, IbIs the bias current of the optical module, ImIs the modulation current of the optical module, IthIs the threshold current of the optical module, and η is the photoelectric conversion efficiency of the optical module;
logic 0 corresponds to an optical power P0 of: p0 ═ Ib-Ith) η, therefore, the average output optical power of the optical module is: pAve(P1+ P0)/2, the extinction ratio of the optical module is:
Figure FDA0002998314300000021
3. the method according to claim 1, wherein when the optical module is a smaller than 10G optical module, obtaining a functional relationship model between the eye pattern parameter to be adjusted and the eye pattern adjustment target parameter from the physical characteristics of the optical module comprises:
for the external modulation optical module, logic 1 corresponds to an optical power P1 as:
Figure FDA0002998314300000022
wherein, IbIs the bias current of the optical module, ImIs the modulation current of the optical module, IthIs the threshold current of the optical module, and η is the photoelectric conversion efficiency of the optical module;
logic 0 corresponds to an optical power P0 of:
Figure FDA0002998314300000023
therefore, the average output optical power of the optical module is: pAve(P1+ P0)/2, the extinction ratio of the optical module is:
Figure FDA0002998314300000024
4. the method of claim 1, wherein at B11To BnmIs a primary function F11(x) To Fnm(x) If the to-be-adjusted eye pattern parameter is not in a linear function relationship with the eye pattern adjustment target parameter, the function relationship model between the to-be-adjusted eye pattern parameter and the eye pattern adjustment target parameter is as follows:
Figure FDA0002998314300000025
5. an apparatus for fast and automatically adjusting parameters of a transmission eye pattern of an optical module, comprising:
the corresponding relation determining module is used for obtaining a functional relation model between the eye pattern parameters to be adjusted and the eye pattern adjustment target parameters from the physical characteristics of the optical module;
when the optical module is an optical module smaller than 10G, for the directly modulated optical module, the functional relationship model between the parameters of the eye pattern to be adjusted and the parameters of the eye pattern adjustment target is as follows:
Figure FDA0002998314300000031
wherein E isrRepresents the extinction ratio of the optical module, IbIs the bias current of the optical module, ImIs the modulation current of the optical module, IthIs the threshold current of the optical module;
when the optical module is an optical module smaller than 10G, for the external modulation optical module, the functional relationship model between the parameters of the eye pattern to be adjusted and the target parameters of the eye pattern adjustment is as follows:
Figure FDA0002998314300000032
wherein E isrRepresents the extinction ratio of the optical module, IbIs the bias current of the optical module, ImIs the modulation current of the optical module, IthIs the threshold current of the optical module;
when the optical module is an optical module of more than 10G, the functional relationship model between the parameters of the eye pattern to be adjusted and the target parameters of the eye pattern adjustment is as follows:
Figure FDA0002998314300000033
wherein A is1To AnTo adjust the eye parameters, B11To BnmTo be a coefficient of undetermination, C1To CmAdjusting a target parameter for the eye diagram;
the coefficient solving module is used for acquiring the current value of each eye pattern parameter to be adjusted, combining the current value of the eye pattern adjustment target parameter obtained by testing, inputting the functional relation model and solving to obtain the value of the undetermined coefficient in the functional relation model;
and the parameter adjusting module is used for solving the function relation model through the specific value to which the eye pattern adjusting target parameter needs to be adjusted based on the undetermined coefficient value to obtain the value of the eye pattern parameter to be adjusted.
6. The apparatus of claim 5, wherein at B11To BnmIs a primary function F11(x) To Fnm(x) If the to-be-adjusted eye pattern parameter is not in a linear function relationship with the eye pattern adjustment target parameter, the function relationship model between the to-be-adjusted eye pattern parameter and the eye pattern adjustment target parameter is as follows:
Figure FDA0002998314300000034
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