CN109655231B - Method and system for detecting working axis of 2 × 2 polarization maintaining optical fiber beam splitter - Google Patents
Method and system for detecting working axis of 2 × 2 polarization maintaining optical fiber beam splitter Download PDFInfo
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Abstract
The invention discloses a method and a system for detecting a working axis of a 2 × 2 polarization-maintaining optical fiber beam splitter, wherein the system comprises a light source module, a polarization-detecting module and a detection module, an output tail fiber of the light source module is connected with an input tail fiber of the polarization module, an output tail fiber of the polarization module is connected with any input tail fiber of the 2 × 2 polarization-maintaining optical fiber beam splitter to be detected, an output tail fiber of the 2 × 2 polarization-maintaining optical fiber beam splitter to be detected, which corresponds to any input tail fiber, is connected with an input tail fiber of the polarization-detecting module, an output tail fiber of the polarization-detecting module is connected with an input tail fiber of the detection module, the polarization module outputs linearly polarized light which is transmitted along the fast axis, the polarization state of the polarization-detecting module is the same as that of the polarization module, and the working axis of the 2 × 2 polarization-maintaining optical fiber beam splitter to be detected is determined according to the power ratio of a first output tail fiber and a first input tail fiber of the 2 × 2 polarization-maintaining.
Description
Technical Field
The invention belongs to the field of polarization maintaining optical fiber beam splitters, and particularly relates to a method and a system for detecting a working shaft of a 2 × 2 polarization maintaining optical fiber beam splitter.
Background
The polarization maintaining fiber beam splitter is one passive optical device and can split one incident beam into two outgoing beams in the same polarization state as the incident beam in certain splitting ratio. The method has the characteristics of low additional loss, good directivity, strong environmental stability, simple control method, low cost and the like, and can be widely applied to the fields of optical fiber sensing, optical fiber communication and the like.
The 2 × 2 polarization-maintaining optical fiber beam splitter has excellent full-temperature performance and beam splitting ratio performance, can be applied to a high-precision optical fiber gyro optical path system with a light path scheme which has higher requirements on devices and needs mode field matching and full polarization maintaining, because the working axes of key devices in the existing high-precision optical fiber gyro optical path system are fast axes, in order to enable light entering an optical fiber ring to be high-polarization, the working axis of the 2 × 2 polarization-maintaining optical fiber beam splitter is also needed to be a fast axis.
However, the working axis of the beam splitter is easily caused to be a slow axis due to the axis-to-axis error in the production process of the 2 × 2 polarization-maintaining optical fiber beam splitter, and the existing in-factory review method adopts injected ASE or low polarization light emitted by S L D, so as to measure the power and the polarization degree of emergent light of the beam splitter, and the method cannot judge the working axis of the 2 × 2 polarization-maintaining optical fiber beam splitter.
Disclosure of Invention
Aiming at the defects or improvement requirements of the prior art, the invention provides a method and a system for detecting the working axis of a 2 × 2 polarization-maintaining optical fiber beam splitter, wherein linearly polarized light transmitted by an input fast axis is transmitted to a 2 × 2 polarization-maintaining optical fiber beam splitter to be detected, the 2 × 2 polarization-maintaining optical fiber beam splitter to be detected passes through detection modules with different polarization states, and the working axis of the 2 × 2 polarization-maintaining optical fiber beam splitter to be detected is determined according to the power ratio of any one output tail fiber and the input tail fiber corresponding to the output tail fiber of the 2 × 2 polarization-maintaining optical fiber beam splitter obtained by testing.
In order to achieve the above object, according to an aspect of the present invention, there is provided a method for detecting a working axis of a 2 × 2 polarization maintaining fiber splitter, comprising the following steps:
s1, outputting linearly polarized light transmitted along a fast axis to any one input tail fiber of a polarization maintaining optical fiber beam splitter of 2 × 2 to be measured, and measuring the power of the linearly polarized light transmitted along the fast axis to be P0；
S2, the output tail fiber of the to-be-tested 2 × 2 polarization maintaining optical fiber beam splitter corresponding to any one input tail fiber is measured to be P after passing through a polarization analyzing module which propagates along a fast axis1；
S3, according to P1/P0And judging the working axis of the polarization maintaining fiber beam splitter of 2 × 2 to be tested.
As a further improvement of the present invention, step S3 specifically includes:
P1/P0within a first preset range, the working axis of the to-be-tested 2 × 2 polarization maintaining optical fiber beam splitter is a fast axis;
P1/P0in a second preset range, passing an output pigtail of the to-be-tested 2 × 2 polarization maintaining optical fiber beam splitter corresponding to any one input pigtail along the slow axisMeasured output power after propagating polarization analyzing module is P1＇，P1＇/P0Within a first preset range, the working axis of the to-be-tested 2 × 2 polarization maintaining optical fiber beam splitter is a slow axis, and P is1＇/P0And in a second preset range, the 2 × 2 polarization maintaining fiber beam splitter to be tested is damaged.
As a further improvement of the invention, the output pigtail corresponding to any one of the input pigtails is determined according to the color and the optical path diagram of the pigtail of the 2 × 2 polarization-maintaining fiber splitter to be tested.
In order to achieve the above object, according to another aspect of the present invention, there is provided a system for detecting an operating axis of a 2 × 2 polarization-maintaining fiber splitter, the system comprising a light source module, a polarization analyzing module and a detecting module, an output pigtail of the light source module is connected to an input pigtail of the polarization module, an output pigtail of the polarization module is connected to any one of input pigtails of a 2 × 2 polarization-maintaining fiber splitter to be tested, an output pigtail of the 2 × 2 polarization-maintaining fiber splitter to be tested corresponding to any one of the input pigtails is connected to an input pigtail of the polarization analyzing module, an output pigtail of the polarization analyzing module is connected to an input pigtail of the detecting module,
the polarizing module outputs linearly polarized light propagating along the fast axis, and the power value P of the tail fiber output by the polarizing module is measured0；
The polarization state of the polarization analyzing module is the same as that of the polarization module, and the detection module measures the power value P of the tail fiber output by the polarization analyzing module1；
According to P1/P0And judging the working axis of the polarization maintaining fiber beam splitter of 2 × 2 to be tested.
As a further development of the invention, P1/P0Within a first preset range, the working axis of the to-be-tested 2 × 2 polarization maintaining optical fiber beam splitter is a fast axis;
P1/P0in a second preset range, a first output tail fiber of the 2 × 2 to-be-tested polarization-maintaining optical fiber beam splitter and an input tail fiber of the polarization analyzing module are subjected to 90-degree axial fusion, and the detection module measures the power value P of the tail fiber output by the polarization analyzing module1＇，P1＇/P0Within a first preset range, the 2 × 2 polarization maintaining optical fiber to be tested is dividedThe working shaft of the beam device is a slow shaft; p1＇/P0And in a second preset range, the 2 × 2 polarization maintaining fiber beam splitter to be tested is damaged.
As a further improvement of the invention, the light source module comprises an ASE light source, and the ASE light source outputs single-mode light with the polarization degree of less than 0.2 dB.
As a further improvement of the invention, the polarization module comprises a polarizer and an input and output tail fiber, the input tail fiber and the output tail fiber of the polarization module are polarization-maintaining optical fibers, and the polarization direction of the polarizer and the fast axis of the tail fiber form an angle of 0 degree.
As a further improvement of the invention, the polarization analyzing module comprises an analyzer and an input and output tail fiber, the input tail fiber and the output tail fiber of the polarization analyzing module are polarization maintaining optical fibers, and the polarization direction of the polarizer forms an angle of 0 degree with the fast axis of the tail fiber.
As a further improvement of the invention, the detection module comprises an optical power meter, an optical fiber clamp and a bare fiber adapter, the optical fiber clamp is provided with a twistable positioning mechanism, and the optical power meter of the detection module is fixedly butted with the bare fiber adapter through the optical fiber clamp.
As a further improvement of the invention, the output pigtail corresponding to any one of the input pigtails is determined according to the color and the optical path diagram of the pigtail of the 2 × 2 polarization-maintaining fiber splitter to be tested.
Generally, compared with the prior art, the above technical solution conceived by the present invention has the following beneficial effects:
the invention discloses a method and a system for detecting a working axis of a 2 × 2 polarization-maintaining optical fiber beam splitter, which are used for transmitting linearly polarized light to a 2 × 2 polarization-maintaining optical fiber beam splitter to be detected through input of fast axis transmission, passing the 2 × 2 polarization-maintaining optical fiber beam splitter to be detected through detection modules with different polarization states, and determining the working axis of the 2 × 2 polarization-maintaining optical fiber beam splitter to be detected according to the power ratio of any output tail fiber and the input tail fiber of the 2 × 2 polarization-maintaining optical fiber beam splitter obtained through testing.
According to the method and the system for detecting the working axis of the 2 × 2 polarization-maintaining optical fiber beam splitter, the polarization module and the polarization analyzing module use the same polarizer or polarization analyzer, the optical path structure is simple, the operation can be completed by using the existing optical device, and the operation is simple and the result is effective.
According to the method and the system for detecting the working shaft of the 2 × 2 polarization maintaining optical fiber beam splitter, the 2 × 2 polarization maintaining optical fiber beam splitter does not need to be uncovered for rechecking, so that the structure of a device is not damaged, and meanwhile, compared with sampling rechecking of the device in a factory, the system can be used for rechecking the whole device, so that the reliability of the device is improved.
Drawings
Fig. 1 is a schematic structural diagram of a working axis detection system of a 2 × 2 polarization maintaining fiber beam splitter 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. The present invention will be described in further detail with reference to specific embodiments.
Fig. 1 is a schematic structural diagram of a working axis detection system of a 2 × 2 polarization-maintaining fiber splitter according to an embodiment of the present invention, as shown in fig. 1, the system includes a light source module, a polarization-generating module, a polarization-analyzing module, and a detection module, wherein,
the light source module comprises a direct current power supply and an ASE light source, the direct current power supply is connected with the light source module, an output tail fiber of the ASE light source is welded with an input tail fiber of the polarization module, and the tail fiber of the light source module is welded with an input tail fiber of the polarization module at any angle; the ASE light source is provided with red and black lines which are respectively connected with the positive and negative electrodes of the DC power supply to measure the fiber output optical power P of the polarization module0(ii) a The direct current power supply is used for supplying power to the ASE light source which is used for outputting the light source to the polarizing module,
the direct current power supply provides +5V direct current voltage and a grounding point for the ASE light source, the ASE light source can work at a rear peak or a front peak, and the working center wavelength of the ASE light source can be 1560nm or 1530 nm; the emitted light of the ASE light source is low-polarized, the linear polarization degree is below 0.2dB, and the output tail fiber is single-mode.
The polarization module comprises a polarizer and an input/output tail fiber, the input tail fiber and the output tail fiber of the polarization module are polarization maintaining fibers, and the polarization direction of the polarizer and the fast axis of the tail fiber form an angle of 0 degree.
The polarization analyzing module comprises an analyzer and an input/output tail fiber, the input and output tail fibers of the polarization analyzing module are polarization maintaining, the analyzer adjusts the polarization analyzing direction to be the same as the polarization direction of the polarizer, the polarization analyzing direction of the analyzer forms an angle of 0 degree with the fast axis of the tail fiber, the first output tail fiber of the 2 × 2 polarization maintaining optical fiber beam splitter to be tested is connected with the input tail fiber of the polarization analyzing module, the first output tail fiber of the 2 × 2 polarization maintaining optical fiber beam splitter to be tested is in 0 degree axial butt fusion with the input tail fiber of the polarization analyzing module, the output tail fiber of the polarization analyzing module is connected with the input tail fiber of the detecting module, and the detecting module measures the fiber output optical power P of the polarization analyzing module1(ii) a If the power value ratio P1/P0Within a first predetermined range, for example, the first predetermined range may be 1/5-1/3, which indicates that the working axis of the polarization maintaining fiber splitter is a fast axis;
the side, close to the light source, of the to-be-detected 2 × 2 polarization-maintaining optical fiber beam splitter further comprises an embedded polarizer, the polarization-maintaining optical fiber beam splitter is of a 2 × 2 abrasive sheet type and is provided with two input tail fibers and two output tail fibers, the first input tail fiber and the second input tail fiber are in one-to-one correspondence with the first output tail fiber and the second output tail fiber respectively.
If the power value ratio P1/P0Within a second preset range, the first output tail fiber of the to-be-tested 2 × 2 polarization-maintaining optical fiber beam splitter and the input tail fiber of the polarization analyzing module are subjected to 90-degree axial fusion, and the detection module detects the polarization analysisPower value P of module output tail fiber1＇，P1＇/P0In a first preset range, for example, the first preset range can be 1/5-1/3, which indicates that the working axis of the 2 × 2 polarization maintaining optical fiber beam splitter to be tested is a slow axis, and if the power value ratio P is1＇/P0If the second predetermined range is less than 1/10, it indicates that the 2 × 2 polarization maintaining fiber splitter is damaged.
The polarization maintaining optical fiber beam splitter to be tested 2 × 2 is internally provided with a polarizing film, the polarization transmitting direction is consistent with the fast axis direction, a semi-transparent and semi-reflective mirror is internally arranged to realize the light splitting function, two input tail fibers can be welded with light source tail fibers and are in one-to-one correspondence with the two output tail fibers, if the beam splitter is accurately aligned in the manufacturing process, output light is transmitted along the fast axis in the output tail fibers and is still output along the fast axis after entering a polarization analyzing module, if the axis is misaligned in the manufacturing process of the beam splitter, the output light is transmitted along the slow axis in the output tail fibers, and the polarization analyzing direction of the polarization analyzing module is perpendicular to the working axis of the output tail fibers of the beam splitter, so that the output optical power is.
The detection module comprises an optical fiber clamp, a bare fiber adapter and an optical power meter, wherein a coating layer of an optical fiber with the length of about 2 cm at the tail end of an output tail fiber of the polarization detection module is stripped by a wire stripper and is fixed on the bare fiber adapter, the bare fiber adapter is inserted into an interface of the optical power meter through a port, the optical fiber clamp comprises a positioning mechanism capable of being twisted, the optical power meter of the detection module is butted with the bare fiber adapter with the positioning mechanism capable of being twisted through the interface, and the position, close to an optical outlet, of the output tail fiber of the polarization detection module is fixed on the bare fiber adapter.
All devices of the system are placed on an epoxy board, and polyimide antistatic adhesive tapes are attached to the edges of the devices to fix the devices on the epoxy board.
A method for detecting a working axis of a 2 × 2 polarization maintaining fiber beam splitter comprises the following steps:
s1, outputting linearly polarized light transmitted along a fast axis to any one input tail fiber of a polarization maintaining optical fiber beam splitter of 2 × 2 to be measured, and measuring the power of the linearly polarized light transmitted along the fast axis to be P0；
S2, to-be-tested 2 × 2 polarization-maintaining optical fiber beam splitter and thereinThe output tail fiber corresponding to any one input tail fiber is measured to have output power P after passing through the polarization analyzing module which propagates along the fast axis1；
S3.P1/P0Within a first preset range, the working axis of the to-be-tested 2 × 2 polarization maintaining optical fiber beam splitter is a fast axis;
S4.P1/P0within a second preset range, an output pigtail of the to-be-tested 2 × 2 polarization maintaining optical fiber beam splitter corresponding to any input pigtail passes through a polarization analyzing module which propagates along the slow axis, and then the output power is measured to be P1＇，P1＇/P0Within a first preset range, the working axis of the to-be-tested 2 × 2 polarization maintaining optical fiber beam splitter is a slow axis, and P is1＇/P0And in a second preset range, the 2 × 2 polarization maintaining fiber beam splitter to be tested is damaged.
The output tail fiber corresponding to any input tail fiber can be determined according to the color of the tail fiber of the to-be-tested 2 × 2 polarization-maintaining optical fiber beam splitter and a beam splitter optical path diagram provided by a manufacturer.
2 × 2 the welding sequence of each melting point of the working shaft detection system of the abrasive disc type polarization maintaining fiber beam splitter is as follows:
the output pigtail of the polarization module is welded with one input pigtail of a 2 × 2 abrasive disc type polarization maintaining optical fiber beam splitter to be tested in a 0-degree counter shaft mode;
the output pigtail of the 2 × 2 abrasive disc type polarization maintaining fiber beam splitter corresponding to the input pigtail is welded with the input pigtail of the polarization analyzing module in a shaft alignment mode at 0 degrees;
the output pigtail of the 2 × 2 plate-type polarization-maintaining fiber splitter corresponding to the input pigtail is welded to the input pigtail of the polarization analyzing module at 90 degrees to the shaft.
If the 2 × 2 abrasive disc type polarization maintaining optical fiber beam splitter output tail fiber and the polarization analyzing module input tail fiber are welded in a 0-degree counter shaft mode, the light power of the tail fiber output by the polarization analyzing module is 1/4 of the light power of a light source, when the 2 × 2 abrasive disc type polarization maintaining optical fiber beam splitter output tail fiber and the polarization analyzing module input tail fiber are welded in a 90-degree counter shaft mode, the light power of the tail fiber output by the polarization analyzing module is approximately equal to 0, and the 2 × 2 abrasive disc type polarization maintaining optical fiber beam splitter works in a fast shaft mode.
If the 2 × 2 abrasive disc type polarization maintaining optical fiber beam splitter output pigtail and the polarization analyzing module input pigtail are welded in a 90-degree counter-axis mode, if the polarization analyzing module output pigtail light power is 1/4 of the light source light power, and the 2 × 2 abrasive disc type polarization maintaining optical fiber beam splitter output pigtail and the polarization analyzing module input pigtail are welded in a 0-degree counter-axis mode, the polarization analyzing module output pigtail light power is approximately equal to 0, and the 2 × 2 abrasive disc type polarization maintaining optical fiber beam splitter works in a slow axis mode.
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 (10)
1. A method for detecting a working axis of a 2 × 2 polarization maintaining fiber beam splitter is characterized by comprising the following specific steps:
s1, outputting linearly polarized light transmitted along a fast axis to any one input tail fiber of a polarization maintaining optical fiber beam splitter of 2 × 2 to be measured, and measuring the output power of the linearly polarized light transmitted along the fast axis to be P0；
S2, the output tail fiber of the to-be-tested 2 × 2 polarization maintaining optical fiber beam splitter corresponding to any one input tail fiber is measured to be P after passing through a polarization analyzing module which propagates along a fast axis1；
S3, according to P1/P0And judging the working axis of the polarization maintaining fiber beam splitter of 2 × 2 to be tested.
2. The method for detecting the working axis of the 2 × 2 polarization maintaining fiber splitter according to claim 1, wherein the step S3 is specifically as follows:
P1/P0within a first preset range, the working axis of the to-be-tested 2 × 2 polarization maintaining optical fiber beam splitter is a fast axis;
P1/P0within a second preset range, an output pigtail of the to-be-tested 2 × 2 polarization maintaining optical fiber beam splitter corresponding to any one input pigtail passes through a polarization analyzing module which propagates along the slow axis, and then the output power is measured to be P1＇，P1＇/P0Within a first preset range, the working shaft of the 2 × 2 polarization maintaining optical fiber beam splitter to be testedIs the slow axis, P1＇/P0And in a second preset range, the 2 × 2 polarization maintaining fiber beam splitter to be tested is damaged.
3. The method for detecting the working axis of the 2 × 2 polarization-maintaining fiber splitter according to claim 1 or 2, wherein the output pigtail corresponding to any one of the input pigtails is determined according to the color and the optical path diagram of the 2 × 2 polarization-maintaining fiber splitter pigtail to be detected.
4. A detection system for a working shaft of a 2 × 2 polarization-maintaining optical fiber beam splitter comprises a light source module, a polarization-maintaining module, a polarization-detecting module and a detection module, wherein an output tail fiber of the light source module is connected with an input tail fiber of the polarization-maintaining module, an output tail fiber of the polarization-maintaining module is connected with any input tail fiber of a 2 × 2 polarization-maintaining optical fiber beam splitter to be detected, an output tail fiber of the 2 × 2 polarization-maintaining optical fiber beam splitter to be detected, which corresponds to any input tail fiber, is connected with an input tail fiber of the polarization-detecting module, and an output tail fiber of the polarization-detecting module is connected with an input tail fiber of the detection module,
the polarizing module outputs linearly polarized light propagating along the fast axis, and the output power value P of the tail fiber output by the polarizing module is measured0；
The polarization state of the polarization analyzing module is the same as that of the polarization module, and the detection module measures the output power value P of the tail fiber output by the polarization analyzing module1；
According to P1/P0And judging the working axis of the polarization maintaining fiber beam splitter of 2 × 2 to be tested.
5. The system of claim 4, wherein the working axis of the 2 × 2 polarization maintaining fiber beam splitter is detected,
P1/P0within a first preset range, the working axis of the to-be-tested 2 × 2 polarization maintaining optical fiber beam splitter is a fast axis;
P1/P0within a second preset range, the output pigtail corresponding to the 2 × 2 polarization maintaining optical fiber beam splitter to be tested and any one of the input pigtails is butt-welded with the input pigtail of the polarization analyzing module by 90 degrees in a shaft, and the polarization analyzing module detects the polarization maintaining optical fiber beam splitter to be testedThe measuring module measures the power value P of the tail fiber output by the polarization analyzing module1＇，P1＇/P0Within a first preset range, the working axis of the to-be-tested 2 × 2 polarization maintaining optical fiber beam splitter is a slow axis, P1＇/P0And in a second preset range, the 2 × 2 polarization maintaining fiber beam splitter to be tested is damaged.
6. The system of claim 4, wherein the light source module comprises an ASE light source, and the ASE light source outputs single-mode light with a polarization degree of less than 0.2 dB.
7. The system of claim 4, wherein the polarization module comprises a polarizer and input and output pigtails, the input and output pigtails of the polarization module are polarization maintaining fibers, and the polarizer polarization direction is at an angle of 0 ° with the fast axis of the pigtail.
8. The working axis detection system of claim 4, wherein the polarization-maintaining module comprises an analyzer and input/output pigtails, the input pigtail and the output pigtail of the polarization-maintaining module are polarization-maintaining fibers, and the polarization direction of the analyzer is 0 ° with respect to the fast axis of the pigtail.
9. The system of claim 4, wherein the detection module comprises an optical power meter, a fiber clamp and a bare fiber adapter, the fiber clamp is a device with a twistable positioning mechanism, and the optical power meter in the detection module is fixedly connected with the bare fiber adapter through the fiber clamp.
10. The system for detecting the working axis of the 2 × 2 polarization-maintaining fiber splitter according to any one of claims 4-9, wherein the output pigtail corresponding to any one of the input pigtails is determined according to the color and the optical path diagram of the 2 × 2 polarization-maintaining fiber splitter pigtail to be detected.
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| CN111273409A (en) * | 2020-01-20 | 2020-06-12 | 中国科学院西安光学精密机械研究所 | System and method for realizing angle transmission by using polarization maintaining optical fiber |
| CN114397732A (en) * | 2021-12-21 | 2022-04-26 | 中国电子科技集团公司第四十三研究所 | Polarization-maintaining mode field conversion optical fiber slow axis direction control method |
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