A fast and slow axis direction detection device

Abstract

The present invention relates to the field of detection of quarter wave plates, and specifically to a fast-slow axis direction detection device. The device comprises a polarized light input module, a polarizer and a light detection module which are arranged in sequence, and the quarter wave plate to be detected is arranged between the polarized light input module and the polarizer. The beneficial effect of the present invention is that, compared with the prior art, the present invention uses a fast-slow axis direction detection device, which is only used for the detection of the fast-slow axis direction, identifies whether the installation direction of the quarter wave plate to be detected is correct, and abandons other functions, so that the function is more single and meets the specific needs of users; at the same time, the operation is simpler, the labor cost is low, the structure of the whole device is simple, the cost is low, the difficulty of later maintenance is low, and it is suitable for large-scale promotion and use; and it is dedicated to the detection object with a specific setting, that is, the quarter wave plate to be detected on the detection light chip, and the detection success rate is very high only when it is correctly installed or incorrectly installed.

Description

Technical Field

[0001] The invention relates to the field of quarter wave plate detection, and in particular to a fast and slow axis direction detection device. Background Art

[0002] The quarter wave plate is installed on the optical chip to form a product, but it is easy to send the quarter wave plate to the wrong direction. Existing instruments for measuring quarter wave plates are mostly used to measure large-sized wave plates in free space. They have complex functions, high costs, cumbersome operations, and large volumes, and are not suitable for large-scale detection of quarter wave plates on production lines. Summary of the invention

[0003] The technical problem to be solved by the present invention is that, in view of the above-mentioned defects of the prior art, a fast and slow axis direction detection device is provided to solve the problem that the existing instruments for measuring quarter wave plates are mostly used to measure large-sized wave plates in free space, have complex functions, high costs, are cumbersome to operate, are large in size, and are not suitable for large-scale detection of quarter wave plates on production lines.

[0004] The technical solution adopted by the present invention to solve its technical problem is: providing a fast-slow axis direction detection device for detecting the fast-slow axis direction of a quarter-wave plate to be detected on an optical chip, comprising a polarized light input module, a polarizer and a light detection module arranged in sequence, wherein the quarter-wave plate to be detected is arranged between the polarized light input module and the polarizer; wherein the polarized light input module generates circularly polarized light and is incident on the quarter-wave plate to be detected, forming linear polarized light in a polarization direction and being incident on the polarizer, wherein the polarizer only allows the linear polarized light formed by the quarter-wave plate to be detected that is correctly or incorrectly installed in the fast-slow axis direction to pass through and be received by the light detection module.

[0005] Among them, the preferred solution is: the processor and the memory, the memory stores a first situation indicating correct installation and a second situation indicating incorrect installation, the first situation and the second situation match the light detection module receiving the light signal or not receiving the light signal, the processor is connected to the light detection module, and determines whether the quarter-wave plate to be detected is installed correctly based on the storage information in the memory.

[0006] Among them, the preferred solution is: the polarization light input module includes a polarization-maintaining laser, a polarization-maintaining optical fiber and an output quarter-wave plate, the polarization-maintaining laser provides a linearly polarized light source and transmits it through the polarization-maintaining optical fiber, and forms circularly polarized light through the output quarter-wave plate.

[0007] Among them, a preferred solution is that the core surface of the polarization-maintaining optical fiber is mounted on the output quarter-wave plate.

[0008] Among them, a preferred solution is that the fast and slow axis directions of the output quarter wave plate form an angle of 45 degrees with the panda eye direction of the polarization-maintaining optical fiber.

[0009] Among them, the preferred solution is: the fast and slow axis directions of the detection quarter wave plate when correctly installed are perpendicular to the fast and slow axis directions of the output quarter wave plate, and the polarizer only allows linear polarization whose fast and slow axis directions are the same as the fast and slow axis directions of the polarization-maintaining laser output light source to pass through; or, the fast and slow axis directions of the detection quarter wave plate when correctly installed are consistent with the fast and slow axis directions of the output quarter wave plate, and the polarizer only allows linear polarization whose fast and slow axis directions are perpendicular to the fast and slow axis directions of the polarization-maintaining laser output light source to pass through.

[0010] Among them, a preferred solution is: a collimating lens is provided between the output quarter-wave plate and the quarter-wave plate to be detected.

[0011] Among them, a preferred solution is that the polarization-maintaining laser is a 1550nm polarization-maintaining laser.

[0012] Among them, a preferred solution is that the light detection module includes a light detector or a frequency-doubling photosensitizer.

[0013] Among them, a preferred solution is that the optical chip is a planar optical waveguide chip.

[0014] The beneficial effects of the present invention are that, compared with the prior art, the present invention uses a fast-slow axis direction detection device, which is only used for the detection of the fast-slow axis direction, to identify whether the installation direction of the quarter-wave plate to be detected is correct, and abandons other functions, making the function more single and meeting the specific needs of users; at the same time, the operation is simpler, the labor cost is low, the structure of the entire device is simple, the cost is low, and the difficulty of later maintenance is low, which is suitable for large-scale promotion and use; and, it is dedicated to the detection object with specific settings, that is, the detection of the quarter-wave plate to be detected on the optical chip, and the detection success rate is very high only when it is correctly installed or incorrectly installed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0016] Figure 1 It is a structural schematic diagram of a fast and slow axis direction detection device of the present invention;

[0017] Figure 2 It is a structural schematic diagram of a fast and slow axis direction detection device based on a processor of the present invention;

[0018] Figure 3 It is a schematic structural diagram of the polarized light input module of the present invention;

[0019] Figure 4 Schematic diagram of the first embodiment of the optical path of the fast-slow axis direction detection device of the present invention;

[0020] Figure 5 It is a schematic diagram of the optical path embodiment 1 of the fast-slow axis direction detection device of the present invention. DETAILED DESCRIPTION

[0021] Now, the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0022] like Figure 1 As shown, the present invention provides a preferred embodiment of a fast-slow axis direction detection device.

[0023] A fast-slow axis direction detection device is used to detect the fast-slow axis direction of a quarter-wave plate 220 to be detected on an optical chip 210, comprising a polarized light input module 110, a polarizer 120 and a light detection module 130 arranged in sequence, wherein the quarter-wave plate 220 to be detected is arranged between the polarized light input module 110 and the polarizer 120; wherein the polarized light input module 110 generates circularly polarized light and is incident on the quarter-wave plate 220 to be detected, forming linear polarized light in a polarization direction and being incident on the polarizer 120, wherein the polarizer 120 only allows the linear polarized light formed by the quarter-wave plate 220 to be detected that is correctly or incorrectly installed to pass through the fast-slow axis direction and be received by the light detection module 130.

[0024] By changing the polarization state of the output polarized light through the quarter wave plate 220 to be detected, the fast and slow axis directions of the linear polarization of the quarter wave plate 220 to be detected that has been correctly installed and the quarter wave plate 220 to be detected that has been incorrectly installed are different. The polarizing plate 120 only allows the linear polarization in one fast and slow axis direction to pass through, thereby identifying whether the quarter wave plate 220 to be detected is correctly installed. Only for the detection of the fast and slow axis directions, that is, to identify whether the installation direction of the quarter wave plate 220 to be detected is correct, other functions are discarded, the function is more single, and the specific needs of users are met; at the same time, the operation is simpler, the labor cost is low, the structure of the entire device is simple, the cost is low, the difficulty of later maintenance is low, and it is suitable for large-scale promotion and use; and it is dedicated to the detection object with a specific setting, that is, the quarter wave plate 220 to be detected on the detection optical chip 210, only when it is correctly installed or incorrectly installed, the detection success rate is very high.

[0025] In this embodiment, and with reference to Figure 2 , the processor 140 and the memory, the memory stores a first situation indicating correct installation and a second situation indicating incorrect installation, the first situation and the second situation match the light detection module 130 receiving an optical signal or not receiving an optical signal, the processor 140 is connected to the light detection module 130, and determines whether the quarter-wave plate 220 to be detected is installed correctly according to the storage information of the memory.

[0026] Specifically, a preferred solution is provided. The polarizer 120 only allows the linear polarization formed by the quarter-wave plate 220 to be detected that is correctly installed in the fast and slow axis directions. The light detection module 130 is connected to the processor 140. When the light detection module 130 detects the light signal, it sends the detection signal to the processor 140. When the processor 140 receives the detection signal within a preset time, it queries the memory and obtains the first situation corresponding to the matching of the detection signal, that is, it knows that the quarter-wave plate 220 to be detected is correctly installed. Subsequently, the user can be informed that the quarter-wave plate 220 to be detected is correctly installed through interactive function modules such as indicator lights, displays or power amplifiers. The entire device realizes intelligent recognition, and the overall structure is simple, the manufacturing and maintenance are simple, and the cost is low and the detection efficiency is high. It is a very cost-effective detection device.

[0027] In this embodiment, the light detection module 130 includes a light detector or a frequency doubling photosensitive film. The principle of the light detector is that the conductivity of the irradiated material changes due to radiation, thereby obtaining whether the light signal is received; based on the photoelectric effect, the thermal detector changes its electrical properties based on the increase in temperature after the material absorbs the light radiation energy. The biggest feature that distinguishes it from the photon detector is that it is non-selective to the wavelength of the light radiation, and it is suitable for automated operations. The frequency doubling photosensitive film can be observed from the outside, and the brightness of the light on the frequency doubling photosensitive film can be used to know whether the light signal is received. It is more suitable for manual operations, and of course it can be used in combination with image processing equipment.

[0028] In this embodiment, the optical chip 210 is a planar optical waveguide chip, which can be used in a coherent receiver or in other wavelength division multiplexing devices such as AWG.

[0029] like Figure 3 As shown, the present invention provides a preferred embodiment of a fast-slow axis direction detection device.

[0030] The polarized light input module 110 includes a polarization-maintaining laser 111 , a polarization-maintaining optical fiber 112 , and an output quarter-wave plate 114 . The polarization-maintaining laser 111 provides a linearly polarized light source and undergoes polarization maintenance.

[0031] The optical fiber transmission forms circularly polarized light through the output quarter wave plate 114 .

[0032] Specifically, the polarization-maintaining laser 111 generates a linearly polarized light source, and the polarization-maintaining optical fiber 112 transmits the linearly polarized light. The polarization-maintaining optical fiber 112 can solve the problem of polarization state change, but it cannot eliminate the birefringence phenomenon in the optical fiber. Instead, it produces a stronger birefringence effect through the design of the optical fiber geometric dimensions to eliminate the influence of stress on the polarization state of the incident light. Therefore, the linearly polarized light passes through the output quarter-wave plate 114 to form circularly polarized light, which is incident on the quarter-wave plate 220 to be detected.

[0033] In this embodiment, the ferrule 113 of the polarization-maintaining optical fiber 112 is surface mounted on the output quarter-wave plate 114. The ferrule 113 is a connector, which is a detachable and classified optical fiber active connector, making the connection and conversion scheduling of the optical channel more flexible and providing for the debugging and maintenance of the optical communication system. The ferrule 113 of the polarization-maintaining optical fiber 112 is surface mounted on the output quarter-wave plate 114, which, on the one hand, makes the overall structure more compact, and on the other hand, makes the polarization-maintaining optical fiber 112 and the output quarter-wave plate 114 integrated, and the optical path transmission is more stable.

[0034] Preferably, the fast and slow axis direction of the output quarter wave plate 114 is at a 45-degree angle to the panda eye direction of the polarization-maintaining optical fiber 112. The purpose is to cooperate with the quarter wave plate 220 to be detected on the optical chip 210 to form a larger difference in the fast and slow axis direction of the linear polarization of the incident light detection module 130, thereby improving the accuracy of the detection result of the entire device. Specifically, when the quarter wave plate 220 to be detected is installed correctly, the fast and slow axis direction is perpendicular to the fast and slow axis direction of the output quarter wave plate 114, and the polarizer 120 only allows the linear polarization whose fast and slow axis direction is the same as the fast and slow axis direction of the output light source of the polarization-maintaining laser 111 to pass through; or, when the quarter wave plate 220 to be detected is installed correctly, the fast and slow axis direction is consistent with the fast and slow axis direction of the output quarter wave plate 114, and the polarizer 120 only allows the linear polarization whose fast and slow axis direction is perpendicular to the fast and slow axis direction of the output light source of the polarization-maintaining laser 111 to pass through.

[0035] More specifically, see Figure 4 and Figure 5 , the fast and slow axis direction of the output quarter wave plate 114 is at a 45-degree angle to the panda eye direction of the polarization-maintaining optical fiber 112, which is a clockwise angle of 45 degrees. The fast and slow axis direction of the quarter wave plate 220 to be detected is perpendicular to the fast and slow axis direction of the output quarter wave plate 114 when it is installed correctly, and the linear polarization 310 incident on the output quarter wave plate 114 is in a vertical direction, forming a circular polarization 320, and the linear polarization 330 output through the quarter wave plate 220 to be detected is also in a vertical direction; and, the fast and slow axis direction of the quarter wave plate 220 to be detected is consistent with the fast and slow axis direction of the output quarter wave plate 114 when it is installed incorrectly, the linear polarization 310 incident on the output quarter wave plate 114 is in a vertical direction, forming a circular polarization 320, and the linear polarization 340 output through the quarter wave plate 220 to be detected is in a horizontal direction. And, the polarizer 120 allows the linear polarization in the vertical direction to pass.

[0036] In this embodiment, a collimating lens 150 is provided between the output quarter wave plate 114 and the quarter wave plate to be detected 220. The collimating lens 150 refers to an instrument that can transform the light from each point in the aperture column into a parallel collimated light beam. If the output quarter wave plate 114 and the quarter wave plate to be detected 220 are close enough, the collimating lens 150 may not be required.

[0037] In this embodiment, the polarization-maintaining laser 111 is a 1550nm polarization-maintaining laser, which has the following advantages: 1. high power and short pulse; 2. high beam quality; 3. high reliability and low price; 4. small size.

[0038] The above is only the best embodiment of the present invention and is not intended to limit the scope of the present invention. All equivalent changes or modifications made according to the scope of the patent application of the present invention are covered by the present invention.

Claims

1. A fast-slow axis direction detection device, used to detect the fast-slow axis direction of a detection quarter-wave plate on an optical chip, characterized in that: It includes a polarized light input module, a polarizer and a light detection module which are arranged in sequence, wherein the detection quarter-wave plate is arranged between the polarized light input module and the polarizer; wherein the polarized light input module generates circularly polarized light and is incident on the detection quarter-wave plate, forming linear polarized light in a polarization direction and is incident on the polarizer, and the polarizer only allows linear polarized light in a fast-slow axis direction to pass through and be received by the light detection module, so as to detect whether the fast-slow axis direction of the detection quarter-wave plate is correct.

2. The fast-slow axis direction detection device according to claim 1, characterized in that: A processor and a memory, wherein the memory stores a first situation indicating correct installation and a second situation indicating incorrect installation, wherein the first situation and the second situation match the light detection module receiving a light signal or not receiving a light signal, and the processor is connected to the light detection module and determines whether the orientation of the detection quarter-wave plate is correct or not based on the storage information in the memory.

3. The fast-slow axis direction detection device according to claim 1, characterized in that: The polarized light input module includes a polarization-maintaining laser, a polarization-maintaining optical fiber and an output quarter-wave plate. The polarization-maintaining laser provides a linearly polarized light source and transmits it through the polarization-maintaining optical fiber, and forms circularly polarized light through the output quarter-wave plate.

4. The fast-slow axis direction detection device according to claim 3, characterized in that: The core surface of the polarization-maintaining optical fiber is mounted on the output quarter-wave plate.

5. The fast-slow axis direction detection device according to claim 3 or 4, characterized in that: The fast and slow axis directions of the output quarter wave plate form an angle of 45 degrees with the panda eye direction of the polarization-maintaining optical fiber.

6. The fast-slow axis direction detection device according to claim 5, characterized in that: When the detection quarter wave plate is correctly oriented, the fast and slow axis directions are perpendicular to the fast and slow axis directions of the output quarter wave plate, and the polarizer only allows linear polarization whose fast and slow axis directions are the same as those of the output light source of the polarization-maintaining laser to pass through; or, when the detection quarter wave plate is correctly oriented, the fast and slow axis directions are consistent with those of the output quarter wave plate, and the polarizer only allows linear polarization whose fast and slow axis directions are perpendicular to those of the output light source of the polarization-maintaining laser to pass through.

7. The fast-slow axis direction detection device according to claim 3, characterized in that: A collimating lens is arranged between the output quarter wave plate and the detection quarter wave plate.

8. The fast-slow axis direction detection device according to claim 3, characterized in that: The polarization-maintaining laser is a 1550nm polarization-maintaining laser.

9. The fast-slow axis direction detection device according to claim 1, characterized in that: The light detection module includes a light detector or a frequency doubling photosensor.

10. The fast-slow axis direction detection device according to claim 1, characterized in that: The optical chip is a planar optical waveguide chip.

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