CN116633429B - Calibrating device for polarization dependent loss tester - Google Patents
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- CN116633429B CN116633429B CN202310900168.7A CN202310900168A CN116633429B CN 116633429 B CN116633429 B CN 116633429B CN 202310900168 A CN202310900168 A CN 202310900168A CN 116633429 B CN116633429 B CN 116633429B
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- 239000013307 optical fiber Substances 0.000 claims abstract description 21
- 230000002999 depolarising effect Effects 0.000 claims abstract description 9
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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
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
An embodiment of the present application provides a calibration device for a polarization dependent loss tester, including: the DFB light source is configured to provide a first optical signal. The SLD/SLED light source is used for providing a second optical signal. One end of the first optical switch is coupled with the DFB light source. One end of the first program-controlled optical attenuator is coupled with the other end of the first optical switch. One end of the second optical switch is coupled with the SLD/SLED light source. One end of the second program-controlled optical attenuator is coupled with the other end of the second optical switch through a depolarizing optical fiber. One end of the optical combiner is coupled with the other end of the first program-controlled optical attenuator and the other end of the second program-controlled optical attenuator. The input end of the polarizer is used for being coupled with the other end of the light combiner, and the output end of the polarizer is used for outputting light. According to the technical scheme provided by the embodiment of the application, the target mixed light with the PDL value being continuously adjustable in (0.1-20) dB can be output, and the accuracy of the PDL value of the target mixed light is better than 0.1dB.
Description
Technical Field
The embodiment of the application relates to the technical field of optical measurement, in particular to a calibration device for a polarization dependent loss tester.
Background
With the rapid development of optical fiber communication, the use of optical passive devices is increasing. And Polarization Dependent Loss (PDL) is an important indicator for measuring the quality of an optical passive device. PDL can be measured by a PDL tester. However, in metering (calibrating) a PDL tester, the range of PDL values generated by the PDL standard is small, whereas the measurement range of the PDL tester is generally large, and the PDL values of the standard cannot cover the range of the PDL tester.
It should be noted that the foregoing is not necessarily prior art, and is not intended to limit the scope of the present application.
Disclosure of Invention
Embodiments of the present application provide a calibration device for a polarization dependent loss tester to solve or alleviate one or more of the technical problems set forth above.
An aspect of an embodiment of the present application provides a calibration apparatus for a polarization dependent loss tester, the apparatus comprising:
a DFB light source for providing a first optical signal;
an SLD/SLED light source for providing a second optical signal;
one end of the first optical switch is coupled with the DFB light source and used for controlling the on-off of the DFB light source;
one end of the first program-controlled optical attenuator is coupled with the other end of the first optical switch and is used for controlling the output power of the DFB light source;
one end of the second optical switch is coupled with the SLD/SLED light source through a depolarization optical fiber and is used for controlling the on-off of the SLD/SLED light source;
one end of the second program-controlled optical attenuator is coupled with the other end of the second optical switch and is used for controlling the output power of the SLD/SLED light source;
one end of the optical beam combiner is coupled with the other end of the first program-controlled optical attenuator and the other end of the second program-controlled optical attenuator;
the input end of the polarizer is used for being coupled with the other end of the beam combiner, and the output end of the polarizer is used for outputting light;
the first optical signal enters the first program-controlled optical attenuator through the first optical switch, and the first program-controlled optical attenuator adjusts the first optical signal and outputs the adjusted first optical signal to the beam combiner; the second optical signal is depolarized by the depolarizing optical fiber and enters a second program-controlled optical attenuator through a second optical switch, the second program-controlled optical attenuator adjusts the depolarized second optical signal and outputs the adjusted second optical signal to the optical combiner; the beam combiner combines the adjusted first optical signal and the adjusted second optical signal into a single-path mixed light; the polarizer adjusts the polarization state of the single-path mixed light; the single-path mixed light is subjected to polarization state adjustment through a polarizer to obtain target mixed light, and the target mixed light is used for being output to a PDL tester, so that the PDL tester measures an actual PDL value according to the target mixed light, and the actual PDL value is used for determining an error of the PDL tester.
Optionally, the method further comprises:
and the driving circuit is respectively coupled with the DFB light source and the SLD/SLED light source and supplies direct current to the DFB light source and the SLD/SLED light source so as to enable the DFB light source and the SLD/SLED light source to perform photoelectric conversion.
Optionally, the method further comprises:
and the temperature control circuit is respectively coupled with the DFB light source and the SLD/SLED light source and used for controlling the DFB light source and the SLD/SLED light source to work at a preset constant temperature.
Optionally, the temperature control circuit comprises a semiconductor thermostat.
Optionally, the method further comprises:
the polarization controller is coupled with the output end of the polarizer and is used for disturbing the target mixed light;
and the optical power meter is coupled with the polarization controller and is used for measuring the power of the disturbed target mixed light so as to acquire a power maximum value and a power minimum value.
Optionally, the traceable PDL value is calculated according to the power maximum value and the power minimum value.
Optionally, the first optical switch is communicatively coupled to the computer device and is configured to receive an instruction from the computer device to control on-off;
the second optical switch is communicatively coupled to the computer device and is configured to receive instructions from the computer device to control the on-off.
Optionally, the first programmed optical attenuator is communicatively coupled to the computer device and is configured to receive instructions from the computer device to control the output power of the first optical signal;
the second programmable optical attenuator is communicatively coupled to the computer device and is configured to receive instructions from the computer device to control an output power of the second optical signal.
Optionally, the simulated PDL value corresponding to the target mixed light is obtained by:
calculating an analog PDL value according to the output power of the first optical signal adjusted by the first program-controlled optical attenuator and the output power of the second optical signal adjusted by the second program-controlled optical attenuator; wherein the analog PDL value is used to provide the calibration reference value.
The embodiment of the application adopts the technical scheme and can have the following advantages:
the first optical signal emitted by the DFB light source sequentially enters the optical combiner through the first optical switch and the first program-controlled optical attenuator. The second optical signal emitted by the SLD/SLED light source sequentially enters the beam combiner through the depolarizing optical fiber, the second optical switch and the second program-controlled optical attenuator. The optical combiner combines the first optical signal and the second optical signal from the first program-controlled optical attenuator and the second program-controlled optical attenuator into a single-path mixed light, inputs the single-path mixed light into the polarizer, and obtains the target mixed light after the polarization state is adjusted by the polarizer. It can be known that in the technical scheme, the light sources can be controlled according to the first optical switch and the second optical switch, and the light output power of each light source of the first program-controlled optical attenuator and the second program-controlled optical attenuator can be simultaneously used, so that the PDL adjustment of single-path or mixed light can be realized. In practical application, the output target mixed light PDL value is continuously adjustable in (0.1-20) dB, and the accuracy of the output target mixed light PDL value is better than 0.1dB.
Drawings
The accompanying drawings illustrate exemplary embodiments and, together with the description, serve to explain exemplary implementations of the embodiments. The illustrated embodiments are for exemplary purposes only and do not limit the scope of the claims. Throughout the drawings, identical reference numerals designate similar, but not necessarily identical, elements.
FIG. 1 schematically shows a schematic configuration of a calibration device for a polarization dependent loss tester according to a first embodiment of the present application;
FIG. 2 schematically illustrates a calibration flow chart of a polarization dependent loss tester according to a first embodiment of the present application;
fig. 3 schematically shows a traceable flow chart of a polarization dependent loss tester calibration device according to a first embodiment of the application.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It should be noted that the descriptions of "first," "second," etc. in the embodiments of the present application are for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present application.
In the description of the present application, it should be understood that the numerical references before the steps do not identify the order in which the steps are performed, but are merely used to facilitate description of the present application and to distinguish between each step, and thus should not be construed as limiting the present application.
First, a term explanation is provided in relation to the present application:
polarization-dependent loss (PDL): for describing the losses caused by the optical signals being affected by different polarization states during transmission.
Polarization Dependent Loss (PDL) tester: an instrument for measuring polarization dependent loss in an optical fiber, optical device or optical system.
PDL Source (PDL Source): a signal source for generating Polarization Dependent Loss (PDL).
PDL Standard (PDL Standard): a reference device for calibrating and validating a Polarization Dependent Loss (PDL) measurement apparatus.
DFB light source (Distributed Feedback Laser Source): a light source based on a distributed feedback laser (DFB laser).
SLD light source (Superluminescent Diode Source): a superluminescent diode light source.
SLED light source (Superluminescent Light-Emitting Diode Source): a superluminescent diode light source.
Optical power meter (Optical Power Meter): an instrument for measuring optical signal power. Working principle of optical power meter: the power is measured based on photoelectric conversion technology, i.e. converting an optical signal into a corresponding electrical signal.
Polarization controller (Polarization Controller): an optical device for precisely controlling the polarization state of an optical signal. The polarization controller may change or adjust the polarization state of the input optical signal to have a particular polarization characteristic.
Next, in order to facilitate understanding of the technical solutions provided by the embodiments of the present application by those skilled in the art, the following description is made on related technologies:
because the optical fiber transmission communication has the characteristics of large capacity, long communication distance, high sensitivity, no influence of noise and the like, the optical fiber communication develops rapidly, and the optical fiber communication gradually becomes a foundation of the modern communication technology. The optical passive device is an important device in an optical fiber communication system, and comprises an optical fiber, an optical fiber connector, an optical splitter, a wavelength division multiplexer, an optical circulator, an optical isolator and the like. PDL is one of the important indicators for measuring the quality of these devices. In an optical network where the polarization does not change randomly, the polarization dependent loss of each optical device may accumulate continuously, degrading the transmission quality of the entire optical network. PDL is one of the parameters that must be measured for passive devices.
PDL refers to the maximum value of the change in optical power of input light in all possible polarization states. The polarization dependent loss of a system is the vector sum of the components of the system, which changes dynamically as the PDL in different directions of the system changes with temperature or stress.
The PDL tester is a device for measuring PDL, and can be applied to the development and production process of photoelectric devices. The measurement principle of the PDL tester is two: one is a polarization scanning method, and the other is a mueller matrix method. The PDL tester based on the polarization scanning method has a wider application range, and comprises hardware such as a polarizer, a light detector and the like. The polarization state of light is continuously changed by the polarization scrambler, the power change of the light signal is detected by the light detector, and then the PDL value is calculated through data acquisition.
The inventors have realized that metering (calibrating) PDL testers is accomplished by some fixed-magnitude PDL standard, since there is no PDL source that can produce a large range of high-precision continuously adjustable. Most of the principles of PDL standards are based on ridge waveguides, and a mode field and refractive index of TE and TM are greatly different by using an asymmetric structure of the ridge waveguide, so that a certain PDL value is generated. A relatively stable PDL value can be obtained in the above manner, but the range of PDL values produced in the above manner generally does not exceed 2.5dB, whereas the measurement range of the PDL tester generally exceeds 20dB, and the value of the standard cannot cover the range of the PDL tester.
To this end, the embodiment of the application provides a calibration device for a polarization dependent loss tester. By the device, the standard optical signal with the PDL value continuously adjustable in (0.1-20) dB can be output, and the PDL value of the standard optical signal is better than 0.1dB in accuracy. In addition, based on the calibrating device for the PDL tester, corresponding PDL calibration and tracing can be carried out, the PDL value is traced to the linearity of the optical power meter, and the measurement uncertainty of the PDL is improved. See in particular below.
Example 1
Fig. 1 schematically shows a calibration device for a polarization dependent loss tester according to a first embodiment of the present application.
As shown in fig. 1, the polarization dependent loss tester calibration apparatus includes:
the system comprises a DFB light source, an SLD/SLED light source, a first optical switch, a second optical switch, a first programmable variable optical attenuator, a second programmable variable optical attenuator, a depolarizing optical fiber, a photosynthetic beam device, a polarizer, a driving circuit and a temperature control circuit.
The relationship between the individual devices in the apparatus is described below.
The DFB light source is configured to provide a first optical signal.
The SLD/SLED light source is used for providing a second optical signal.
One end of the first optical switch is coupled with the DFB light source, and the first optical switch is used for controlling on-off of the DSB light source.
One end of the first program-controlled optical attenuator is coupled with the other end of the first optical switch, and the first program-controlled optical attenuator is used for controlling the output power of the DFB light source.
One end of the second optical switch is coupled with the SLD/SLED light source through a depolarization optical fiber, and the second optical switch is used for controlling the on-off of the SLD/SLED light source.
One end of the second program-controlled optical attenuator is coupled with the other end of the second optical switch, and the second program-controlled optical attenuator is used for controlling the output power of the SLD/SLED light source.
One end of the optical combiner is coupled with the other end of the first program-controlled optical attenuator and the other end of the second program-controlled optical attenuator.
The input end of the polarizer is used for being coupled with the other end of the light combiner, and the output end of the polarizer is used for outputting light.
The first optical signal enters the first program-controlled optical attenuator through the first optical switch, and the first program-controlled optical attenuator adjusts the first optical signal and outputs the adjusted first optical signal to the beam combiner. The second optical signal is depolarized by the depolarizing optical fiber and enters the second program-controlled optical attenuator through the second optical switch, and the second program-controlled optical attenuator adjusts the depolarized second optical signal and outputs the adjusted second optical signal to the optical combiner. The beam combiner combines the adjusted first optical signal and the adjusted second optical signal into a single-path mixed light. The polarizer adjusts the polarization state of the single-pass mixed light. The single-path mixed light is subjected to polarization state adjustment through a polarizer to obtain target mixed light, and the target mixed light is used for being output to a PDL tester, so that the PDL tester measures an actual PDL value according to the target mixed light, and the actual PDL value is used for determining an error of the PDL tester.
The depolarizing fiber can be used to reduce the output polarization of an SLD/SLED laser. The SLD/SLED light source has a relatively low degree of polarization, and the second optical signal generated by the SLD/SLED light source is generally unpolarized or low polarized in polarization, and the degree of polarization of the second optical signal is approximately equal to 0 after the second optical signal is processed by the depolarizing fiber. In the DFB light source, only the polarization state in one specific direction can be enhanced and amplified due to the characteristics of the mirror, so that the first optical signal generated by the DFB light source has high polarization, the degree of which is close to 1. By making the polarization degree of the first optical signal approximately equal to 1 and the polarization degree of the second optical signal approximately equal to 0, the power of the first optical signal can be changed along with the change of the polarization state after passing through the polarizer, and the power of the second optical signal can not be changed along with the change of the polarization state after passing through the polarizer.
It should be noted that the light source generating the first optical signal is not limited to the DFB light source, and alternative light sources having the same optical characteristics as the DFB light source, such as DBR (Distributed Bragg Reflector) light source and ECL (External Cavity Laser) light source, may be used. The light source generating the second optical signal is not limited to the SLD/SLED light source, and alternative light sources having the same optical characteristics as the SLD/SLED light source, such as ASE (Amplified Spontaneous Emission) light sources, may be used.
In some embodiments, as shown in FIG. 2, the target mixed light output by the polarizer may be directly coupled to the PDL tester via an optical fiber. The analog PDL value of the target mixed light is regulated, the target mixed light is input to a PDL tester, and the PDL tester can measure the corresponding actual PDL value. And calculating errors of the simulated PDL value and an actual PDL value measured by a PDL tester, wherein the errors are measurement errors corresponding to the PDL tester. In the above embodiment, by adjusting the analog PDL value of the target mixed light, the target mixed light is input to the PDL tester, and the corresponding actual PDL value is measured according to the PDL tester, so that the measurement error corresponding to the PDL tester can be obtained quickly.
In the above embodiment, the first optical signal emitted by the DFB optical source sequentially enters the optical combiner through the first optical switch and the first programmable optical attenuator. The second optical signal emitted by the SLD/SLED light source sequentially enters the beam combiner through the depolarizing optical fiber, the second optical switch and the second program-controlled optical attenuator. The optical combiner combines the first optical signal and the second optical signal from the first program-controlled optical attenuator and the second program-controlled optical attenuator into a single-path mixed light, inputs the single-path mixed light into the polarizer, and obtains the target mixed light after the polarization state is adjusted by the polarizer. It can be known that in the technical scheme, the light sources can be controlled according to the first optical switch and the second optical switch, and the light output power of each light source of the first program-controlled optical attenuator and the second program-controlled optical attenuator can be simultaneously used, so that the PDL adjustment of single-path or mixed light can be realized. In practical application, the output target mixed light PDL value is continuously adjustable in (0.1-20) dB, and the accuracy of the output target mixed light PDL value is better than 0.1dB.
In an alternative embodiment, the apparatus further comprises a drive circuit. The driving circuit is respectively coupled with the DFB light source and the SLD/SLED light source, and provides direct current for the DFB light source and the SLD/SLED light source so as to enable the DFB light source and the SLD/SLED light source to perform photoelectric conversion. The drive circuit can convert commercial power (alternating current) into direct current for the DFB laser and SLD/SLED so that the DFB light source and the SLD/SLED light source can perform photoelectric conversion.
In an alternative embodiment, the apparatus further comprises a temperature control circuit. The temperature control circuit is respectively coupled with the DFB light source and the SLD/SLED light source and is used for controlling the DFB light source and the SLD/SLED light source to work at a preset constant temperature.
In an alternative embodiment, the temperature control circuit comprises a semiconductor thermostat.
In the above alternative embodiment, the temperature control circuit may be used to make the DFB light source and the SLD/SLED light source operate at a constant temperature, so that the first and second optical signals output by the DFB light source and the SLD/SLED light source are more stable, thereby improving the accuracy of the PDL value of the output optical signal.
In an alternative embodiment, as shown in fig. 3, the apparatus further comprises a polarization controller and an optical power meter. Wherein, polarization controller couples the output of polarizer, polarization controller is used for disturbing the mixed light of partial target. An optical power meter is coupled to the polarization controller for measuring the power of the scrambled target mixed light to obtain a power maximum and a power minimum.
In an alternative embodiment, the traceable PDL value is calculated from the power maximum and the power minimum.
The optical power meter may include a fast optical power meter or the like. The target mixed light output by the polarizer can be sequentially input into the polarization controller and the optical power meter through the optical fiber. The polarization controller is used for changing the polarization state of the target mixed light.
When tracing the calibration device of the PDL tester, the polarizer can output target mixed light with PDL in a certain range, and the polarization controller can change the polarization state of the target mixed light. In the target mixed light outputted from the polarization controller, the power of a part of the target mixed light is changed along with the change of the polarization state, and the other part of the target mixed light is not changed. The maximum value of the optical power along with the change of the polarization state is the polarization dependent loss. The maximum power can be obtained by measuring the power of the target mixed light by an optical power meterP MAX And power minimumP MIN . According to the maximum powerP MAX And power minimumP MIN A traceable PDL value may be calculated. The trace-source PDL value may be calculated according to the following formula:
in the above alternative embodiment, the target mixed light is input to the polarization controller, and the polarization controller changes the polarization state of the target mixed light. The polarization controller inputs the processed target mixed light to the optical power meter. The PDL value of the target mixed light can be calibrated through the optical power meter, the PDL value of the target mixed light is traced to the linearity of the optical power meter, and the measurement uncertainty of the PDL is improved.
In an alternative embodiment, the first optical switch is communicatively coupled to the computer device, and the first optical switch is configured to receive an instruction from the computer device to control the on/off state. The second optical switch is communicatively coupled with the computer device and is used for receiving an instruction of the computer device to control on-off.
The computer equipment sends an instruction to the first optical switch, so that the on-off state of the DFB light source can be conveniently and rapidly adjusted. And the computer equipment sends an instruction to the second optical switch, so that the on-off state of the SLD/SLED light source can be conveniently and rapidly adjusted.
In an alternative embodiment, a first programmable optical attenuator is communicatively coupled to the computer device, the first programmable optical attenuator being configured to receive instructions from the computer device to control the output power of the first optical signal. The second program-controlled optical attenuator is communicatively coupled to the computer device, and the second program-controlled optical attenuator is configured to receive an instruction from the computer device to control an output power of the second optical signal.
In an alternative embodiment, the simulated PDL value for the target mixed light is obtained by: and calculating the analog PDL value according to the output power of the first optical signal adjusted by the first program-controlled optical attenuator and the output power of the second optical signal adjusted by the second program-controlled optical attenuator. Wherein the analog PDL value is used to provide the calibration reference value.
The polarization degree of the light output by the DFB laser is approximately equal to 1, and the polarization degree of the light output by the SLD/SLED laser is approximately equal to 0 after the treatment of depolarization fiber. The light output by the DFB laser and the light output by the SLD/SLED laser are mixed to one beam output by the optical combiner to obtain target mixed light. After the target mixed light passes through the polarizer, the polarization states of the two light beams are inconsistent. Specifically: after the light output by the DFB light source passes through the polarizer, if the polarization state changes, the power of the light output by the DFB light source changes along with the change of the polarization state, and the power of the light output by the SLD/SLED light source does not change along with the change of the polarization state.
For example, when the DFB light source outputs light with the power ofP 1 The optical power output by the SLD/SLED light source is respectivelyP 2 (in mW), the simulated PDL value can be calculated as follows:
in the above alternative embodiment, the output power of the first optical signal is controlled by a first programmable optical attenuator. And controlling the output power of the second optical signal through the second program-controlled optical attenuator. According to the output power of the first optical signal adjusted by the first program-controlled optical attenuator and the output power of the second optical signal adjusted by the second program-controlled optical attenuator, the analog PDL value corresponding to the target mixed light can be obtained. Under the control of the first program-controlled optical attenuator and the second program-controlled optical attenuator, the analog PDL value corresponding to the target mixed light is continuously adjustable in (0.1-20) dB, and the accuracy of the analog PDL value is better than 0.1dB.
It should be noted that the foregoing is only a preferred embodiment of the present application, and is not intended to limit the scope of the present application, and all equivalent structures or equivalent processes using the descriptions of the present application and the accompanying drawings, or direct or indirect application in other related technical fields, are included in the scope of the present application.
Claims (9)
1. A calibration device for a polarization dependent loss tester, comprising:
a DFB light source for providing a first optical signal;
an SLD/SLED light source for providing a second optical signal;
one end of the first optical switch is coupled with the DFB light source and used for controlling the on-off of the DFB light source;
one end of the first program-controlled optical attenuator is coupled with the other end of the first optical switch and is used for controlling the output power of the DFB light source;
one end of the second optical switch is coupled with the SLD/SLED light source through a depolarization optical fiber and used for controlling the on-off of the SLD/SLED light source, and the depolarization optical fiber is used for reducing the output polarization degree of the SLD/SLED light source;
one end of the second program-controlled optical attenuator is coupled with the other end of the second optical switch and is used for controlling the output power of the SLD/SLED light source;
one end of the optical beam combiner is coupled with the other end of the first program-controlled optical attenuator and the other end of the second program-controlled optical attenuator;
the input end of the polarizer is used for being coupled with the other end of the beam combiner, and the output end of the polarizer is used for outputting light;
the first optical signal enters the first program-controlled optical attenuator through the first optical switch, and the first program-controlled optical attenuator adjusts the first optical signal and outputs the adjusted first optical signal to the beam combiner; the second optical signal is depolarized by the depolarizing optical fiber and enters a second program-controlled optical attenuator through a second optical switch, the second program-controlled optical attenuator adjusts the depolarized second optical signal and outputs the adjusted second optical signal to the optical combiner; the beam combiner combines the adjusted first optical signal and the adjusted second optical signal into a single-path mixed light; the polarizer adjusts the polarization state of the single-path mixed light; the single-path mixed light is subjected to polarization state adjustment through a polarizer to obtain target mixed light, and the target mixed light is used for being output to a polarization dependent loss PDL tester, so that the PDL tester measures an actual PDL value according to the target mixed light, and the actual PDL value is used for determining an error of the PDL tester.
2. The apparatus as recited in claim 1, further comprising:
and the driving circuit is respectively coupled with the DFB light source and the SLD/SLED light source and supplies direct current to the DFB light source and the SLD/SLED light source so as to enable the DFB light source and the SLD/SLED light source to perform photoelectric conversion.
3. The apparatus as recited in claim 1, further comprising:
and the temperature control circuit is respectively coupled with the DFB light source and the SLD/SLED light source and used for controlling the DFB light source and the SLD/SLED light source to work at a preset constant temperature.
4. A device as claimed in claim 3, wherein the temperature control circuit comprises a semiconductor thermostat.
5. The apparatus of any one of claims 1 to 4, further comprising:
the polarization controller is coupled with the output end of the polarizer and is used for disturbing the target mixed light;
and the optical power meter is coupled with the polarization controller and is used for measuring the power of the disturbed target mixed light so as to acquire a power maximum value and a power minimum value.
6. The apparatus of claim 5, wherein a trace-source PDL value is calculated from the power maximum and the power minimum.
7. The apparatus of any one of claims 1 to 4, wherein:
the first optical switch is communicatively coupled with the computer equipment and is used for receiving an instruction of the computer equipment to control on-off;
and the second optical switch is in communication coupling with the computer equipment and is used for receiving the instruction of the computer equipment to control on-off.
8. The apparatus of any one of claims 1 to 4, wherein:
the first program-controlled optical attenuator is communicatively coupled with the computer equipment and is used for receiving an instruction of the computer equipment to control the output power of the first optical signal;
and the second program-controlled optical attenuator is communicatively coupled with the computer equipment and is used for receiving the instruction of the computer equipment to control the output power of the second optical signal.
9. The apparatus of any one of claims 1 to 4, wherein the simulated PDL value for the target mixed light is obtained by:
calculating an analog PDL value according to the output power of the first optical signal adjusted by the first program-controlled optical attenuator and the output power of the second optical signal adjusted by the second program-controlled optical attenuator; wherein the analog PDL value is used to provide the calibration reference value.
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