Transceiving assembly for optical fiber sensing

Abstract

The invention relates to the technical field of optical fiber sensing transmitting and receiving, and discloses a transmitting and receiving assembly for optical fiber sensing, which comprises a tube shell, a transmitting end part, a receiving end part, a light splitting part and a tail fiber collimator are arranged on the tube shell, and the transmitting end part, the receiving end part, the light splitting part and the tail fiber collimator are integrally packaged, so that the transmitting end part, the receiving end part, the light splitting part and the tail fiber collimator are integrated. The optical fiber sensing transmit-receive assembly comprises a transmitting end part and a receiving end part, the transmitting end part comprises a tube shell, the tube shell is welded with a tungsten copper heat sink, an original separating device is replaced, the miniaturization of a system is realized, the cost is effectively reduced, the transmitting end part comprises a refrigerator, the refrigerator is welded at the inner side of the tube shell, the refrigerator is welded with the tungsten copper heat sink, and a eutectic substrate is welded at the top of the tungsten copper heat sink. By means of the transmitting end part, the receiving end part, the light splitting part and the tail fiber collimator, a traditional fused biconical taper coupler is omitted, the polarization beam splitter and the converging lens are matched, the system light path loss is greatly reduced, and the performance of the whole device is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of optical fiber sensing transceiver, in particular to an optical fiber sensing transceiver component. Background Art

[0002] The transceiver assembly for optical fiber sensing is an optical transceiver device used in optical fiber sensing systems. It can convert sensor signals into optical signals and transmit them through optical fibers. It can also receive optical signals and convert them into electrical signals for sensor processing. The transceiver assembly for optical fiber sensing generally consists of two parts: an optical transmitter and an optical receiver. The optical transmitter is responsible for converting electrical signals into optical signals and transmitting them through optical fibers. The optical receiver is responsible for receiving optical signals and converting them into electrical signals for sensor processing. This component usually uses modulation and demodulation technology for signal conversion to improve transmission efficiency and sensor sensitivity. The transceiver assembly for optical fiber sensing has the advantages of high speed, long-distance transmission, and anti-interference, making optical fiber sensing technology widely used in many fields, such as temperature sensing, optical fiber strain measurement, and optical fiber pressure sensing. It plays an important role in the fields of industry, medical care, and transportation, and provides reliable technical support for the realization of intelligence and automation.

[0003] At present, traditional fiber optic gyroscopes use SLD broadband light sources and discrete devices such as PinFet detectors and couplers for fiber optic sensing transmission and reception. The optical path loss in the fiber optic gyroscope system is large and the overall performance is poor. For this reason, we propose a transceiver component for fiber optic sensing. Summary of the invention

[0004] The object of the present invention is to provide a transceiver assembly for optical fiber sensing to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a transceiver assembly for optical fiber sensing, comprising a tube shell, on which a transmitting end part, a receiving end part, a light splitting part and a pigtail collimator are arranged, and the transmitting end part, the receiving end part, the light splitting part and the pigtail collimator are integrated and packaged to replace the original separate components, thereby realizing the miniaturization of the system and effectively reducing the cost, wherein the transmitting end part comprises:

[0006] A refrigerator, the refrigerator is welded to the inner side of the tube shell, and the refrigerator is welded to a tungsten copper heat sink;

[0007] Eutectic substrate, the eutectic substrate is welded on the top of the tungsten copper heat sink, a collimating lens is bonded to the top of the tungsten copper heat sink by glue, and the collimating lens is actively coupled;

[0008] Thermistor, the top of the eutectic substrate is bonded with a thermistor and an LD chip.

[0009] Preferably, the receiving end portion comprises a pad, the bottom of the pad is welded to the inner side of the tube shell, and a ceramic circuit board is arranged on the surface of the pad.

[0010] Preferably, the ceramic circuit board is connected to the pad block via silver glue, and the top of the ceramic circuit board is bonded to the PD substrate via glue.

[0011] Preferably, the splitting part includes a tungsten copper pad, which is welded to the inner side of the tube shell, and the top of the tungsten copper pad is bonded with a polarization beam splitter, a rotator and a converging lens. The traditional fused tapered coupler is eliminated, and the polarization beam splitter and the converging lens are used in combination to greatly reduce the system optical path loss and improve the performance of the overall device.

[0012] Preferably, the pigtail collimator consists of a mounting shell, a microlens and a polarization-maintaining optical fiber. The mounting shell is connected to the tube shell by laser welding. The microlens is fixedly mounted on the inner wall of the mounting shell. A polarization-maintaining optical fiber is fixed on the right side of the mounting shell. The use of polarization-maintaining optical fiber replaces the traditional low-polarization light source, effectively reducing the cost of the light source chip.

[0013] Preferably, a cover plate is welded on the surface of the tube shell, and the cover plate seals the tube shell so that a closed space is formed inside the tube shell, thereby protecting the components inside the tube shell.

[0014] Preferably, the top of the tube shell is penetrated by the laser diode and fixed to the laser diode, and the laser diode is welded to the inner side of the tube shell by eutectic welding.

[0015] Preferably, fourteen laser diodes are provided, and seven laser diodes form a group and are divided into two groups of laser diodes. The two groups of laser diodes are symmetrically arranged with the transverse center line of the tube shell as the symmetry axis.

[0016] Compared with the prior art, the present invention provides a transceiver assembly for optical fiber sensing, which has the following beneficial effects:

[0017] 1. The optical fiber sensor transceiver component eliminates the traditional fused taper coupler by setting up the transmitting end part, receiving end part, splitting part and pigtail collimator, and adopts the combination of polarization beam splitter and converging lens to greatly reduce the system optical path loss and improve the performance of the overall device.

[0018] 2. The optical fiber sensing transceiver component replaces the original separate components by integrating and packaging the transmitting end part, the receiving end part, the splitting part and the pigtail collimator, thereby realizing the miniaturization of the system and effectively reducing the cost.

[0019] 3. The optical fiber sensor transceiver assembly uses polarization-maintaining optical fiber to replace the traditional low-polarization light source, effectively reducing the cost of the light source chip.

[0020] 4. The optical fiber sensing transceiver assembly has a cover plate which seals the tube shell, so that a closed space is formed inside the tube shell, thereby protecting the components inside the tube shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the cross-sectional top view of the structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the top view structure of the present invention;

[0023] Figure 3 It is a schematic diagram of the cross-sectional structure of the pigtail collimator of the present invention.

[0024] In the figure: 1. tube shell; 2. transmitting end part; 21. refrigerator; 22. tungsten copper heat sink; 23. eutectic substrate; 24. collimating lens; 25. thermistor; 26. LD chip; 3. receiving end part; 31. pad; 32. ceramic circuit board; 33. PD substrate; 4. splitting part; 41. tungsten copper pad; 42. polarization beam splitter; 43. rotator; 44. converging lens; 5. pigtail collimator; 51. mounting shell; 52. microlens; 53. polarization-maintaining fiber; 6. cover plate; 7. laser diode. DETAILED DESCRIPTION

[0025] like Figure 1-3 As shown, the present invention provides a technical solution: a transceiver assembly for optical fiber sensing, including a tube shell 1, on which a transmitting end part 2, a receiving end part 3, a light splitting part 4 and a pigtail collimator 5 are arranged. The transmitting end part 2, the receiving end part 3, the light splitting part 4 and the pigtail collimator 5 are integrated and packaged to replace the original separate components, thereby realizing the miniaturization of the system and effectively reducing the cost. The transmitting end part 2 includes:

[0026] A cooler 21, the cooler 21 is welded to the inner side of the tube shell 1, and the cooler 21 is welded to a tungsten copper heat sink 22;

[0027] A eutectic substrate 23 is welded on the top of the tungsten copper heat sink 22, and a collimating lens 24 is bonded to the top of the tungsten copper heat sink 22 by glue, and the collimating lens 24 is actively coupled;

[0028] Thermistor 25 and LD chip 26 are bonded to the top of the eutectic substrate 23 .

[0029] The receiving end part 3 includes a pad 31, the bottom of which is welded to the inner side of the tube shell 1, a ceramic circuit board 32 is arranged on the surface of the pad 31, the ceramic circuit board 32 is connected to the pad 31 through silver glue, and a PD substrate 33 is bonded to the top of the ceramic circuit board 32 through glue.

[0030] The light splitting part 4 includes a tungsten copper pad 41, which is welded to the inner side of the tube shell 1. A polarization beam splitter 42, a rotator 43 and a converging lens 44 are bonded to the top of the tungsten copper pad 41. The traditional fused tapered coupler is eliminated, and the polarization beam splitter 42 and the converging lens 44 are used in combination to greatly reduce the system optical path loss and improve the performance of the overall device.

[0031] The pigtail collimator 5 consists of a mounting shell 51, a microlens 52 and a polarization-maintaining optical fiber 53. The mounting shell 51 is connected to the tube shell 1 by laser welding. The microlens 52 is fixedly mounted on the inner wall of the mounting shell 51. The polarization-maintaining optical fiber 53 is fixed on the right side of the mounting shell 51. The use of the polarization-maintaining optical fiber 53 replaces the traditional low-polarization light source, effectively reducing the cost of the light source chip.

[0032] A cover plate 6 is welded to the surface of the tube shell 1 , and the cover plate 6 seals the tube shell 1 , so that a closed space is formed inside the tube shell 1 , thereby protecting the components inside the tube shell 1 .

[0033] The top of the tube shell 1 is penetrated by the laser diode 7 and fixed to the laser diode 7 , and the laser diode 7 is welded to the inner side of the tube shell 1 by eutectic welding.

[0034] Fourteen laser diodes 7 are provided, and seven laser diodes 7 form a group and are divided into two groups of laser diodes 7. The two groups of laser diodes 7 are symmetrically arranged with the transverse center line of the tube shell 1 as the symmetry axis.

[0035] Based on the above embodiment, when in use, the collimating lens 24 is used to collimate the light source, the polarization beam splitter 42 transmits P polarized transmitted light and refracts S polarized received light at 90°, the rotator 43 does not change the polarization of the transmitted light, and rotates the polarization direction of the reverse propagating received P polarized light by 90°. The transmitting light path is the laser diode 7, the collimating lens 24, the PBS, the rotator 43, the microlens 52 to the polarization-maintaining fiber 53, and the final polarization state does not change. The receiver light path is the polarization-maintaining fiber 53, the microlens 52, the rotator 43, the PBS, the converging lens 44, and the PD substrate 33. The polarization state of the light path is changed from P polarization to S polarization through the rotator 43.

[0036] The above generally describes the present invention in detail, but it is obvious to a person skilled in the art that some modifications or improvements can be made to the present invention. Therefore, modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A transceiver assembly for optical fiber sensing, comprising a tube housing (1), characterized in that: The tube shell (1) is provided with a transmitting end part (2), a receiving end part (3), a light splitting part (4) and a pigtail collimator (5), and the transmitting end part (2) comprises: A refrigerator (21), the refrigerator (21) being welded to the inner side of the tube shell (1), and the refrigerator (21) being welded to a tungsten copper heat sink (22); A eutectic substrate (23), the eutectic substrate (23) being welded to the top of the tungsten copper heat sink (22), and a collimating lens (24) being bonded to the top of the tungsten copper heat sink (22) by glue; Thermistor (25), the top of the eutectic substrate (23) is bonded with thermistor (25) and LD chip (26).

2. The optical fiber sensing transceiver assembly according to claim 1, characterized in that: The receiving end portion (3) comprises a cushion block (31), the bottom of the cushion block (31) is welded to the inner side of the tube shell (1), and a ceramic circuit board (32) is arranged on the surface of the cushion block (31).

3. The optical fiber sensing transceiver assembly according to claim 1, characterized in that: The ceramic circuit board (32) is connected to the pad (31) via silver glue, and the top of the ceramic circuit board (32) is bonded to the PD substrate (33) via glue.

4. The optical fiber sensing transceiver assembly according to claim 1, characterized in that: The pigtail collimator (5) is composed of a mounting shell (51), a microlens (52) and a polarization-maintaining optical fiber (53); the mounting shell (51) is connected to the tube shell (1) by laser welding; the microlens (52) is fixedly mounted on the inner wall of the mounting shell (51); and the polarization-maintaining optical fiber (53) is fixed on the right side of the mounting shell (51).

5. The optical fiber sensing transceiver assembly according to claim 1, characterized in that: A cover plate (6) is welded to the surface of the tube shell (1).

6. The optical fiber sensing transceiver assembly according to claim 1, characterized in that: The top of the tube shell (1) is penetrated by the laser diode (7) and fixed to the laser diode (7), and the laser diode (7) is welded to the inner side of the tube shell (1) by eutectic welding.

7. The optical fiber sensing transceiver assembly according to claim 1, characterized in that: The light splitting part (4) comprises a tungsten copper pad (41), the tungsten copper pad (41) is welded to the inner side of the tube shell (1), and a polarization beam splitter (42), an optical rotator (43) and a converging lens (44) are bonded to the top of the tungsten copper pad (41).

8. The optical fiber sensing transceiver assembly according to claim 6, characterized in that: Fourteen laser diodes (7) are provided, and seven laser diodes (7) form a group and are divided into two groups of laser diodes (7). The two groups of laser diodes (7) are symmetrically arranged with the transverse center line of the tube shell (1) as the symmetry axis.

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