CN116388861A - Calibration method of coherent light receiving device tester - Google Patents
Calibration method of coherent light receiving device tester Download PDFInfo
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Abstract
The invention relates to the technical fields of photoelectric device measurement and microwave photonics, and discloses a calibration method of a coherent light receiving device tester. The method comprises the following steps: setting microwave parameters of a microwave module of the coherent light receiving device tester, and completing the calibration of a microwave domain by utilizing a microwave error coefficient model; constructing a corresponding photoelectric/electro-optic/photo-optic error calibration model aiming at photoelectric/electro-optic/photo-optic test; selecting a calibration type according to different test requirements, and correcting different error items; the method is to use twelve error models commonly used at present and combine SOLT calibration technology to develop wideband optical network error modeling and calibration technology research, and ensure the measurement precision of the wideband high-speed optical network parameter tester; and meanwhile, a complementary error calibration method is introduced, so that error influence caused by accessing the cable is eliminated. Different types of light path calibration is performed in a targeted manner, and the calibration efficiency and accuracy are greatly improved.
Description
Technical Field
The invention relates to the technical field of photoelectric device measurement and microwave photonics, in particular to a calibration method of a coherent light receiving device tester.
Background
With the advent of the 5G age, the rise of ultra-large capacity optical information technology and the increasing demand for communication have occurred, and the communication backbone network is bearing an increasing transmission pressure. Existing IM/DD (intensity modulated/direct detection) communication schemes are difficult to carry the drastically increased bandwidth requirements.
The optical receiver is used as one of key devices in an optical fiber communication system, and the performance of the optical receiver directly influences transmission indexes such as transmission distance, error rate and the like of the system. Compared with an IM/DD direct detection receiver, the coherent detection receiving device extracts information modulated in multiple dimensions such as amplitude, frequency, phase and the like by mixing signal light carrying information with a local carrier wave, has the advantages of high sensitivity, long relay distance, good selectivity, large communication capacity, rich modulation dimension and mode and the like, and has good application prospect. The method is characterized in that a coherent light receiving device with higher performance is developed, detected and applied, and the frequency response, time delay and frequency response imbalance of the coherent light receiving device are mastered and known through measurement.
The precise measurement and characterization of various key parameters of a coherent light receiving device is becoming an important point in the field of optical fiber communication research. The measurement data of the current coherent light receiving device tester comprises a test error, a system error, a random error, a drift error and the like. The presence of these errors reduces the accuracy and precision of the test data, severely affecting the analysis of the performance of the coherent light receiving device, and therefore calibration must be performed before the coherent light receiving device tester is used to reduce the impact of the test errors on the measurement results.
The existing calibration method has the defects of complex operation, large system accumulated error and the like, and cannot eliminate externally introduced errors, so that the calibration requirement cannot be well met.
Disclosure of Invention
The present invention is directed to a calibration method for a coherent light receiving device tester, so as to solve the problems set forth in the background art.
In order to solve the technical problems, the invention provides the following technical scheme: a method for simultaneously introducing complementary error calibration by using twelve error models commonly used at present and combining SOLT calibration technology; the method comprises the following steps:
step 2, setting a connection mode of a system and an electro-optical calibration error model during electro-optical device test, solving the true values of four S parameters, and carrying out error calibration and correction;
step 3, setting a connection mode of a system and a photoelectric calibration error model during testing of the photoelectric device, solving the true values of four S parameters, and carrying out error calibration and correction;
step 4, setting a connection mode of a system and a light-light calibration error model during testing of the light device, solving the true values of four S parameters, and carrying out error calibration and correction;
and 5, exchanging cables of the coherent light receiving device output channel and the vector network analyzer based on the complementary calibration method, substituting the two complementary measurement data into the calibration model, and eliminating errors introduced from the outside.
The microwave parameters of the microwave module comprise a starting frequency, a terminating frequency, points and an intermediate frequency bandwidth.
The test link of the electro-optic device test system consists of a microwave module, an electro-optic device to be tested and a photoelectric conversion module; the system connection mode is that an electro-optical device to be tested is connected with an optical transmitting port and an optical receiving port of the broadband high-speed optical network parameter tester, a vector network analyzer provides a radio frequency input signal to be loaded on the electro-optical modulator to be tested, and a radio frequency output port is connected with a radio frequency receiving port of the vector network analyzer.
The electro-optical calibration error model consists of a microwave error model and a photoelectric conversion error model.
The test link of the photoelectric device test system consists of a microwave module, an electro-optic modulation module and a photoelectric device to be tested; the system connection mode is that the optical emission port of the photoelectric device to be tested and the broadband high-speed optical network parameter tester is connected with the radio frequency receiving port of the vector network analyzer.
The photoelectric calibration error model consists of a microwave error model and an electro-optic modulation error model.
The test link of the optical device test system consists of a microwave module, an electro-optical modulation module, an optical device to be tested and a photoelectric conversion module; the system is connected in such a way that an optical device to be tested is connected with an optical transmitting port and an optical receiving port of the broadband high-speed optical network parameter tester.
The light-light calibration error model consists of a microwave error model, an electro-optic modulation error model and a photoelectric conversion error model.
Compared with the prior art, the invention has the following beneficial effects:
by means of the simple and effective method, delay errors caused by cables are eliminated, and the technical pain points that errors introduced from outside are difficult to eliminate, calibration is complex, operation is complex and accumulated errors of the system are large are solved.
From the aspect of hardware, measurement uncertainty caused by the fact that a calibration system is built by various instruments such as a signal generator, a laser, an electro-optical modulator, a photoelectric detector and a microwave power meter is avoided, calibration accuracy is greatly improved, and testing accuracy and reliability of optical device testing can be improved.
From the aspect of the calibration flow, different types of optical path calibration can be performed in a targeted manner, and the error of an external cable can be eliminated only through exchange, so that the calibration efficiency and the calibration precision are greatly improved.
Drawings
FIG. 1 is a schematic diagram of a calibration method of a coherent light receiving device tester according to the present invention;
FIG. 2 is a single-port error correction model of the present invention;
FIG. 3 is a schematic view of a straight-through calibration piece measurement of the present invention;
FIG. 4 is a schematic diagram of the complementary calibration of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Please refer to fig. 1
Example 1
The present invention is directed to a calibration method for a coherent light receiving device tester, so as to solve the problems set forth in the background art.
In order to solve the technical problems, the invention provides the following technical scheme: a method for simultaneously introducing complementary error calibration by using twelve error models commonly used at present and combining SOLT calibration technology; the method comprises the following steps:
step 2, setting a connection mode of a system and an electro-optical calibration error model during electro-optical device test, solving the true values of four S parameters, and carrying out error calibration and correction;
step 3, setting a connection mode of a system and a photoelectric calibration error model during testing of the photoelectric device, solving the true values of four S parameters, and carrying out error calibration and correction;
step 4, setting a connection mode of a system and a light-light calibration error model during testing of the light device, solving the true values of four S parameters, and carrying out error calibration and correction;
and 5, exchanging cables of the coherent light receiving device output channel and the vector network analyzer based on the complementary calibration method, substituting the two complementary measurement data into the calibration model, and eliminating errors introduced from the outside.
Specifically, the fixed frequency shift optical carrier signal may be realized by loading a fixed frequency microwave signal to the electro-optical modulator, amplifying and filtering the fixed frequency microwave signal, or by loading a fixed frequency microwave signal to the electro-optical modulator.
Example two
The present invention is directed to a calibration method for a coherent light receiving device tester, so as to solve the problems set forth in the background art.
The method for simultaneously introducing the complementary error calibration comprises a microwave module, an electro-optical device calibration, an optical device calibration and an externally introduced error complementary calibration by adopting a twelve-term error model which is commonly used at present and combining with SOLT calibration technology.
The microwave parameters of the microwave module comprise a starting frequency, a terminating frequency, points and an intermediate frequency bandwidth.
The test link of the electro-optic device test system consists of a microwave module, an electro-optic device to be tested and a photoelectric conversion module; the system connection mode is that an electro-optical device to be tested is connected with an optical transmitting port and an optical receiving port of the broadband high-speed optical network parameter tester, a vector network analyzer provides a radio frequency input signal to be loaded on the electro-optical modulator to be tested, and a radio frequency output port is connected with a radio frequency receiving port of the vector network analyzer.
The electro-optical calibration error model consists of a microwave error model and a photoelectric conversion error model.
The test link of the photoelectric device test system consists of a microwave module, an electro-optic modulation module and a photoelectric device to be tested; the system connection mode is that the optical emission port of the photoelectric device to be tested and the broadband high-speed optical network parameter tester is connected with the radio frequency receiving port of the vector network analyzer.
The photoelectric calibration error model consists of a microwave error model and an electro-optic modulation error model.
The test link of the optical device test system consists of a microwave module, an electro-optical modulation module, an optical device to be tested and a photoelectric conversion module; the system is connected in such a way that an optical device to be tested is connected with an optical transmitting port and an optical receiving port of the broadband high-speed optical network parameter tester.
The light-light calibration error model consists of a microwave error model, an electro-optic modulation error model and a photoelectric conversion error model.
Example III
The embodiment is a specific implementation of a calibration method and an operation example of a coherent light receiving device tester
A calibration method and operation example of a coherent light receiving device tester are as follows:
fig. 1 shows a specific embodiment of the method for calibrating a coherent light receiving device tester according to the present invention. The calibration model of this particular embodiment includes: microwave domain and optical domain. The optical domain further includes an electro-optic calibration error model, and an electro-optic calibration error model.
The electro-optic/photo-optic calibration error model is divided into forward and backward error models according to the difference of the excitation ports, wherein E DF And E is DR Respectively representing forward and backward directional errors; e (E) SF And E is SR Respectively representing forward and backward equivalent source mismatch errors; e (E) RF And E is RR Representing forward and backward reflection measurement tracking errors, respectively; e (E) TF And E is TR Representing forward and backward transmission measurement tracking errors, respectively; e (E) XF And E is XR Representing forward and backward transmission measurement crosstalk errors, respectively; e (E) LF And E is LR Representing forward and backward equivalent load mismatch errors, respectively. From the electro-optic calibration error model, can be obtained
S m12 ＝E XR (4)
The formulas (1) to (4) are relational formulas of the measured value of the S parameter of the electro-optic/photoelectric/optical device to be measured, the true value of the S parameter and an error term, and the essence of error calibration and correction is to solve the true values of the four S parameters.
Before the electro-optic/optical devices are measured by the broadband high-speed optical network parameter tester, various system errors in the error model need to be calculated and stored by the measurement calibration piece. And once the error model and the error items in the error model are determined, error correction can be carried out on the direct measurement result, and finally, the true value of the network parameter of the electro-optic/photoelectric/optical device to be measured is obtained through calculation of an error correction algorithm. The project is to adopt twelve error models which are commonly used at present, adopt SOLT calibration technology based on the models, exchange the positions of the input end cable and the output end cable of the system based on a complementary calibration method, substitute the two complementary measurement data into the calibration model, eliminate the externally introduced errors and ensure the measurement accuracy of the broadband high-speed optical network parameter tester.
SOLT calibration techniques are measured using short-open-match-pass calibrators. The calibration process includes measurement of three single port calibration pieces (shorting piece, open piece, and loading piece) and measurement of one pass-through piece. Firstly, connecting SOLT calibration pieces at 1 and 2 ports respectively to carry out single-port measurement, and then connecting the 1 and 2 ports to carry out straight-through measurement. The specific SOLT calibration procedure is as follows:
(1) Single port calibration piece measurement
When the i (i=1, 2) port is connected to the single-port calibration piece, the twelve-term error model can be simplified into a single-port error calibration model as shown in fig. 2, where the reflection coefficient of the single-port calibration piece X is Γ X When the measured value is S mii (X) can be calculated to obtain
i port one-time short circuit calibration piece S (Γ=Γ) S ) Open-circuit calibration piece O (Γ=Γ O ) Matching calibration piece L (Γ=Γ L ) Can be obtained by combining (4)
Solving the equation set can obtain the directivity error, source mismatch error and back tracking error on the i port as follows
At the same time, the crosstalk error E can be directly measured when the matching load calibration piece is connected Xi ＝S mji (L)(i≠j)。
(2) Straight-through calibration piece measurement
When the i-port is excited, the error model in the case of 1, 2-port pass-through measurement can be simplified as shown in fig. 3. In the straight-through process, S 11 ＝S 22 ＝0，S 21 ＝S 12 =1, the expression for the measurement of the scattering parameter is obtained as follows
From this, the following can be calculated
E Ti ＝(1-E Si E Li )[S mji (T)-E Xi ] (11)
And the SOLT calibration process is completed by the two steps, the size of 12 errors is calculated, the two-port to-be-measured piece is measured, the influence of the measurement errors in the scattering parameters of the to-be-measured piece is eliminated by an error correction algorithm, and the real parameters of the to-be-measured electro-optic/photoelectric/optical device can be obtained.
As shown in fig. 4, the test is to be performedThe coherent optical device is connected to a vector network analyzer to measure the transfer function H of two channels Q (ω)*H 1 (ω) and H I (ω)*H 2 (omega) exchanging two cables at the output end of the coherent light receiving device, and measuring the transfer function of the two channels to be H Q (ω)*H 2 (ω) and H I (ω)*H 1 And (omega), thereby obtaining the dual-channel relative transfer function (12) after eliminating the cable error.
In summary, the technology eliminates the delay error caused by the cable by a simple and effective method, and solves the technical pain points of difficult elimination of externally introduced errors, complex calibration, complex operation and large accumulated errors of the system.
From the aspect of hardware, measurement uncertainty caused by the fact that a calibration system is built by various instruments such as a signal generator, a laser, an electro-optical modulator, a photoelectric detector and a microwave power meter is avoided, calibration accuracy is greatly improved, and testing accuracy and reliability of optical device testing can be improved.
From the aspect of the calibration flow, different types of optical path calibration can be performed in a targeted manner, and the error of an external cable can be eliminated only through exchange, so that the calibration efficiency and the calibration precision are greatly improved.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A calibration method of a coherent light receiving device measuring instrument is characterized in that: the method comprises the following steps:
step 1, setting microwave parameters of a microwave module of a coherent light receiving device tester, and completing calibration of a microwave domain by utilizing a microwave error coefficient model;
step 2, setting a connection mode of a system and an electro-optical calibration error model during electro-optical device test, solving the true values of four S parameters, and carrying out error calibration and correction;
step 3, setting a connection mode of a system and a photoelectric calibration error model during testing of the photoelectric device, solving the true values of four S parameters, and carrying out error calibration and correction;
step 4, setting a connection mode of a system and a light-light calibration error model during testing of the light device, solving the true values of four S parameters, and carrying out error calibration and correction;
and 5, exchanging cables of the coherent light receiving device output channel and the vector network analyzer based on the complementary calibration method, substituting the two complementary measurement data into the calibration model, and eliminating errors introduced from the outside.
2. The method for calibrating a coherent light receiving device tester according to claim 1, wherein: the microwave parameters in the step 1 comprise a starting frequency, a terminating frequency, points and an intermediate frequency bandwidth.
3. The method for calibrating a coherent light receiving device tester according to claim 1, wherein: the test link of the system in the step 2 is composed of a microwave module, an electro-optical device to be tested and a photoelectric conversion module;
the electro-optical device to be tested is connected with the optical transmitting port and the optical receiving port of the broadband high-speed optical network parameter tester, the vector network analyzer provides a radio frequency input signal to be loaded on the electro-optical modulator to be tested, and the radio frequency output port is connected with the radio frequency receiving port of the vector network analyzer.
4. The method for calibrating a coherent light receiving device tester according to claim 1, wherein: the electro-optical calibration error model in the step 2 is composed of a microwave error model and a photoelectric conversion error model.
5. The method for calibrating a coherent light receiving device tester according to claim 1, wherein: the test link of the system in the step 3 is composed of a microwave module, an electro-optic modulation module and a photoelectric device to be tested;
the optical emission port of the photoelectric device to be tested and the broadband high-speed optical network parameter tester are connected with the radio frequency receiving port of the vector network analyzer.
6. The method for calibrating a coherent light receiving device tester according to claim 1, wherein: the photoelectric calibration error model in the step 3 is composed of a microwave error model and an electro-optic modulation error model.
7. The method for calibrating a coherent light receiving device tester according to claim 1, wherein: the test link of the system in the step 4 is composed of a microwave module, an electro-optical modulation module, an optical device to be tested and a photoelectric conversion module;
the optical device to be tested is connected with the optical transmitting port and the optical receiving port of the broadband high-speed optical network parameter tester.
8. The method for calibrating a coherent light receiving device tester according to claim 1, wherein: the light-light calibration error model in the step 4 is composed of a microwave error model, an electro-optic modulation error model and a photoelectric conversion error model.
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