Integrated transceiver device and packaging structure for three-axis fiber optic gyroscope

Abstract

The present invention provides an integrated transceiver device for a three-axis fiber optic gyroscope and its packaging structure. The device comprises a light source, an optical modulation unit, three thin-film beam splitters, three optical coupling units, three self-focusing lenses, three optical fibers, and three detectors. Light output from the light source passes through the optical modulation unit to form linearly polarized light. This linearly polarized light is then sequentially divided into reflected light and transmitted light by the three incident thin-film beam splitters. The reflected light from each thin-film beam splitter is coupled into an optical fiber through an optical coupling unit and a self-focusing lens. The optical fiber is then connected to a meter, and the return light from the meter is converged into a detector through an optical coupling unit. The integrated transceiver device of the present invention integrates multiple discrete optical components into a single device, significantly reducing its size while maintaining its original functionality, thus meeting the miniaturization requirements of a three-axis fiber optic gyroscope.

Description

Technical Field

[0001] The present invention belongs to the technical field of fiber optic gyroscopes, and in particular relates to an integrated transceiver device for a three-axis fiber optic gyroscope and a packaging structure thereof. Background Art

[0002] A fiber optic gyroscope (FOG) is a sensor that measures the angular velocity of a sensitive carrier based on the Sagnac effect. It has the advantages of no moving parts, fast startup time, and wide accuracy coverage. It has attracted widespread attention and application in fields such as aviation, aerospace, navigation, and land-based precision navigation, precision weapon guidance, and automatic control. To better meet the development needs of miniaturized and low-cost inertial navigation systems, the next generation of FOGs urgently needs to be miniaturized. The optical path, which accounts for over 70% of the FOG's volume, is the primary challenge in achieving miniaturization, and there is an urgent need to explore technical solutions for miniaturizing the optical path.

[0003] A three-axis fiber optic gyroscope (FOG) is sensitive to angular rates in the east-west, south-north, and sky-sky directions during spatial motion and is a typical architectural form of a FOG. The optical path of a traditional three-axis FOG consists of one light source, three detectors, four couplers, three modulators, and three fiber optic loops. Each optical device is individually packaged, making it difficult to reduce the size and cost of the gyroscope. The fiber optic loops and modulators are the core sensitive components of the FOG, and their size is highly correlated with their accuracy. Therefore, the light source, detector, and coupler are the primary targets for optical path miniaturization. The primary challenge facing the current miniaturization of FOG optical paths is how to miniaturize these three components and package them in the same structure while ensuring the functional and performance integrity of each component. Summary of the Invention

[0004] In response to the technical problem that the existing three-axis fiber optic gyroscope optical paths are all discrete devices and are too large in size, the present invention proposes an integrated transceiver device and packaging structure for a three-axis fiber optic gyroscope, integrating the light source, detector and coupler into a design to meet the miniaturization requirements of the three-axis fiber optic gyroscope.

[0005] The technical solutions adopted by the present invention to solve the above technical problems are as follows:

[0006] The present invention provides an integrated transceiver device for a three-axis fiber optic gyroscope, comprising a light source, a light adjustment unit, three thin film beam splitters, three optical coupling units, three self-focusing lenses, three optical fibers, and three detectors;

[0007] The light output by the light source is converted into linearly polarized light by the light adjustment unit, and the linearly polarized light is incident on the first thin film beam splitter and is divided into a first reflected light and a first transmitted light;

[0008] The first reflected light is coupled into an optical fiber through a first optical coupling unit and a first self-focusing lens, the optical fiber is connected to a meter head, and the return light from the meter head is focused onto a first detector through the first optical coupling unit;

[0009] The first transmitted light is incident on the second thin film beam splitter and is divided into a second reflected light and a second transmitted light. The second reflected light is coupled into an optical fiber through a second optical coupling unit and a second self-focusing lens. The optical fiber is connected to a meter head. The return light from the meter head is focused onto a second detector through the second optical coupling unit.

[0010] The second transmitted light is incident on the third thin film beam splitter and is divided into a third reflected light and a third transmitted light. The third reflected light is coupled into an optical fiber through a third optical coupling unit and a third self-focusing lens. The optical fiber is connected to a meter head. The return light from the meter head is converged to a third detector through the third optical coupling unit.

[0011] Furthermore, the light adjustment unit includes a beam expander and collimator lens assembly, a light isolation assembly, and a polarizer that are connected in sequence.

[0012] Furthermore, the light adjustment unit includes an optical isolation component, a polarizer, and a beam expander collimating lens component connected in sequence. The beam expander collimating lens component includes a 45° reflector for turning the light output from the light source 90° and incident on the first film beam splitter.

[0013] Furthermore, the optical coupling unit is a thin film beam splitter.

[0014] Furthermore, the optical coupling unit includes a thin film polarization beam splitter and a Faraday rotator, the Faraday rotator rotates the incident light by 45°; and the splitting ratio of the thin film polarization beam splitter is 1:1.

[0015] Furthermore, the splitting ratios of the first, second and third thin film beam splitters are 1:4, 1:3 and 1:1 respectively.

[0016] Furthermore, the integrated transceiver device for the three-axis fiber optic gyroscope also includes a fourth detector for detecting the third transmitted light and performing power compensation. The splitting ratios of the first, second and third thin film beam splitters are 3:7, 1:1 and 1:1 respectively.

[0017] The present invention also provides an integrated transceiver device packaging structure for a three-axis fiber optic gyroscope, which adopts a three-layer layout. The first layer includes a light source, a thermistor, an optical path device and a detector. The second layer includes a transition heat sink, a heat sink, a fixing seat, and a fixing structure. The third layer includes a refrigerator, an optical device substrate, and an overall device substrate. The upper surface of the overall device substrate includes a refrigerator and an optical device substrate. A heat sink and a transition heat sink are arranged on the upper surface of the refrigerator from bottom to top. The light source chip and the thermistor are arranged on the transition heat sink; the optical device is arranged on the optical device substrate through a fixing seat, and the detector is arranged on the optical device substrate through a fixing structure.

[0018] Furthermore, the optical device includes a light adjustment unit, a thin film beam splitter, a light coupling unit, a self-focusing lens, and an optical fiber, and the light source, optical device, and detector are arranged according to any of the aforementioned optical paths.

[0019] Furthermore, the light source is a superluminescent diode, the detector is a PIN-FET component or a PIN-TIA component, the transition heat sink is a ceramic material, and the cooler is a bidirectional cooler.

[0020] The beneficial effects of the present invention compared with the prior art are as follows:

[0021] (1) The integrated transceiver device of the present invention integrates eight discrete optical devices required by the fiber optic gyroscope in the original technical solution into one device, significantly reducing the device size while maintaining the original function;

[0022] (2) The integrated transceiver device of the present invention has an optical power compensation function, achieving high stability of optical power. At the same time, the device realizes a full polarization-maintaining optical path, which can further improve the signal-to-noise ratio;

[0023] (3) The integrated transceiver device of the present invention is realized based on micro-optical technology, and the device has excellent optical performance, high technical maturity, and high process realization. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are included to provide a further understanding of the embodiments of the present invention, constitute a part of the specification, illustrate the embodiments of the present invention, and together with the description, explain the principles of the present invention. Obviously, the drawings described below are only some embodiments of the present invention, and those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0025] Figure 1 This is a schematic structural diagram of an integrated transceiver device for a three-axis fiber optic gyroscope provided in a first embodiment of the present invention;

[0026] Figure 2A schematic structural diagram of an integrated transceiver device for a three-axis fiber optic gyroscope provided in a second specific embodiment of the present invention;

[0027] Figure 3 A schematic structural diagram of an integrated transceiver device for a three-axis fiber optic gyroscope provided in a third specific embodiment of the present invention;

[0028] Figure 4 This is a schematic structural diagram of an integrated transceiver device for a three-axis fiber optic gyroscope provided in a fourth specific embodiment of the present invention;

[0029] Figure 5 This is a schematic structural diagram of an integrated transceiver device for a three-axis fiber optic gyroscope provided in a fifth specific embodiment of the present invention;

[0030] Figure 6 This is a schematic structural diagram of an integrated transceiver device for a three-axis fiber optic gyroscope provided in a sixth specific embodiment of the present invention;

[0031] Figure 7 This is a schematic structural diagram of an integrated transceiver device for a three-axis fiber optic gyroscope provided in a seventh specific embodiment of the present invention;

[0032] Figure 8 This is a schematic structural diagram of an integrated transceiver device for a three-axis fiber optic gyroscope provided in an eighth embodiment of the present invention;

[0033] Figure 9 A schematic diagram of the packaging structure of an integrated transceiver device for a three-axis fiber optic gyroscope provided in a specific embodiment of the present invention;

[0034] Figure 10 This is a schematic diagram of the external packaging structure of an integrated transceiver device for a three-axis fiber optic gyroscope provided in a specific embodiment of the present invention.

[0035] The above drawings include the following reference numerals:

[0036] 211. Light source chip; 221. Beam expander and collimator lens group; 231. Optical isolation component; 232. Polarizer; 241. First thin film beam splitter; 242. Second thin film beam splitter; 243. Third thin film beam splitter; 251. First thin film polarization beam splitter; 252. Second thin film polarization beam splitter; 253. Third thin film polarization beam splitter; 261. First Faraday rotator; 262. Second Faraday rotator; 263. Third Faraday rotator; 271. First self-focusing lens; 272. Second self-focusing lens; 273. Third self-focusing lens; 281. First output fiber pigtail; 282. Second output fiber pigtail; 283. Third output fiber pigtail; 291. First detector chip; 292. Second detector chip; 293. Third detector chip; 294. Fourth detector chip. DETAILED DESCRIPTION

[0037] Below specific embodiments of the present invention are described in detail. In the following description, for the purpose of explanation and not limitation, specific details are set forth to help fully understand the present invention. However, it will be apparent to those skilled in the art that other embodiments that have departed from these specific details can also be used to practice the present invention.

[0038] It should be noted that, in order to avoid obscuring the present invention due to unnecessary details, the accompanying drawings only show the device structure and / or processing steps closely related to the solutions of the present invention, while omitting other details that are not closely related to the present invention.

[0039] The present invention proposes an integrated transceiver device for a three-axis fiber optic gyroscope, comprising a light source, a light adjustment unit, three thin film beam splitters, three optical coupling units, three self-focusing lenses, three optical fibers, and three detectors;

[0040] The light output from the light source passes through the light adjustment unit to form linearly polarized light, and the linearly polarized light is incident on the first thin film beam splitter and is divided into a first reflected light and a first transmitted light;

[0041] The first reflected light is coupled into an optical fiber through a first optical coupling unit and a first self-focusing lens. The optical fiber is connected to a meter head. The return light from the meter head is focused onto a first detector through the first optical coupling unit.

[0042] The first transmitted light enters the second thin film beam splitter and is divided into a second reflected light and a second transmitted light. The second reflected light is coupled into an optical fiber through a second optical coupling unit and a second self-focusing lens. The optical fiber is connected to the meter head. The return light from the meter head is focused onto the second detector through the second optical coupling unit.

[0043] The second transmitted light enters the third thin film beam splitter and is divided into the third reflected light and the third transmitted light. The third reflected light is coupled into an optical fiber through the third optical coupling unit and the third self-focusing lens. The optical fiber is connected to the meter head. The return light from the meter head is converged to the third detector through the third optical coupling unit.

[0044] The integrated transceiver device of the present invention integrates eight discrete optical devices required by the fiber optic gyroscope in the original technical solution into one device, greatly reducing the size of the device while maintaining the original function, thus meeting the miniaturization requirements of the three-axis fiber optic gyroscope.

[0045] Furthermore, the light adjustment unit includes a beam expander and collimator lens assembly, a light isolation assembly, and a polarizer which are connected in sequence.

[0046] Furthermore, the light adjustment unit includes an optical isolation component, a polarizer, and a beam expander collimating lens component connected in sequence. The beam expander collimating lens component includes a 45° reflector for turning the light output from the light source 90° and incident on the first thin film beam splitter to reduce the volume of the optical path.

[0047] Furthermore, the optical coupling unit is a thin film beam splitter, which transmits part of the incident light into the self-focusing lens, reflects part of the incident light out of the device, and reflects the return light passing through the meter head into the detector.

[0048] Furthermore, the optical coupling unit includes a thin film polarization beam splitter and a Faraday rotator. The thin film polarization beam splitter transmits part of the incident light into the Faraday rotator, transmits part of the incident light out of the reflective device, and reflects the return light through the meter head into the detector. The Faraday rotator rotates the incident light 45°.

[0049] Furthermore, the first, second and third thin film beam splitters have a beam splitting ratio η B1 ,η B2 ,η B3 They are 1:4, 1:3 and 1:1 respectively.

[0050] Furthermore, the integrated transceiver device for the three-axis fiber optic gyroscope further includes a fourth detector for detecting the third transmitted light. At this time, the beam splitting ratio η of the first, second, and third thin film beam splitters is B1 ,η B2 ,η B3 They are 3:7, 1:1, and 1:1 respectively, which is convenient for light intensity adjustment.

[0051] Furthermore, the thin film polarization beam splitter has a beam splitting ratio of 1:1.

[0052] The present invention proposes a packaging structure for an integrated transceiver device for a three-axis fiber optic gyroscope, which adopts a three-layer layout. The first layer includes a light source, a thermistor, an optical path device and a detector. The second layer includes a transition heat sink, a heat sink, a fixing seat and a fixing structure. The third layer includes a refrigerator, an optical device substrate and an overall device substrate. The upper surface of the overall device substrate includes a refrigerator and an optical device substrate. A heat sink and a transition heat sink are arranged on the upper surface of the refrigerator from bottom to top. The light source chip and the thermistor are arranged on the transition heat sink; the optical device is arranged on the optical device substrate through a fixing seat, and the detector is arranged on the optical device substrate through a fixing structure. The light source, optical device and detector are arranged according to the aforementioned optical path.

[0053] The technical solution of the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0054] Example 1:

[0055] According to one embodiment of the present invention, the integrated transceiver device is composed of 23 devices in total, such as Figure 1As shown, the integrated transceiver device includes a light source chip 211, a beam expander and collimator lens group 221, an optical isolation component 231, a polarizer 232, a first thin-film beam splitter 241, a second thin-film beam splitter 242, a third thin-film beam splitter 243, a first thin-film polarization beam splitter 251, a second thin-film polarization beam splitter 252, a third thin-film polarization beam splitter 253, a first Faraday rotator 261, a second Faraday rotator 262, a third Faraday rotator 263, a first self-focusing lens 271, a second self-focusing lens 272, a third self-focusing lens 273, a first output fiber pigtail 281, a second output fiber pigtail 282, a third output fiber pigtail 283, a first detector chip 291, a second detector chip 292, a third detector chip 293, and a fourth detector chip 294. The integrated transceiver device shown in the embodiment has the functions of light emission, detection, beam splitting / combining, polarization / polarization, and power stabilization. The packaging form of the integrated transceiver device of the present invention has a total of 12 pins and 3 pigtails, including a ceramic substrate, a heat sink, a thermistor, a bidirectional cooling device, a pin, a nozzle (tail pipe), and a tube shell.

[0056] The working principle of the integrated transceiver device for the three-axis fiber optic gyroscope described in this embodiment is as follows: the low-polarization incoherent light beam emitted by the light source chip 211 is shaped by the beam expander and collimator lens group 221 and then enters the polarizer 232 through the optical isolation component 231. The optical isolation component 231 suppresses the influence of the return light. The single-polarization linear polarized light passes through the first thin film beam splitter 241 with a beam splitting ratio of η. B1 , is divided into a first reflected light and a first transmitted light. The first reflected light passes through the first thin film polarization beam splitter 251, and the beam splitting ratio is η P1 The transmitted light passes through the first Faraday rotator 261, and then is coupled into the first output pigtail 281 through the first self-focusing lens 271 and connected to the meter head (i.e., the fiber ring and the Y waveguide modulator). The return light from the meter head returns along the original path, converges to the first detector chip 291 through the first thin film polarization beam splitter 251, and records the sensitive phase. The first transmitted light passes through the second thin film beam splitter 242, and the beam splitting ratio is η B2 , is divided into a second reflected light and a second transmitted light. The second reflected light passes through the second thin film polarization beam splitter 252, and the beam splitting ratio is η P2 The transmitted light passes through the second Faraday rotator 262, and then is coupled into the second output fiber optic 282 through the second self-focusing lens 272 and connected to the meter. The return light from the meter returns along the original path, and is focused by the second thin film polarization beam splitter 252 to the second detector chip 292 to record the sensitive phase. The second transmitted light passes through the third thin film beam splitter 243, and the splitting ratio is η B3 , is divided into a third reflected light and a third transmitted light. The third reflected light passes through the third thin film polarization beam splitter 253, and the beam splitting ratio is η P3The transmitted light passes through the third Faraday rotator 263, then through the third self-focusing lens 273, coupled into the third output pigtail 283, and connected to the meter. The return light from the meter returns along the original path, converges through the third thin-film polarization beam splitter 253, and is then focused onto the third detector chip 293 to record the sensitive phase. The third transmitted light is captured by the fourth detector chip 294 for power compensation and stabilization. The splitting ratio η is: B1 is 1:4, the beam splitting ratio η P1 is 1, the beam splitting ratio η B2 is 1:3, the beam splitting ratio η P2 is 1, the beam splitting ratio η B3 is 1, the beam splitting ratio η P3 is 1.

[0057] Example 2:

[0058] According to one embodiment of the present invention, the integrated transceiver device is composed of 22 devices in total, such as Figure 2 As shown, the integrated transceiver device includes a light source chip 211, a beam expander and collimator lens group 221, an optical isolation component 231, a polarizer 232, a first thin-film beam splitter 241, a second thin-film beam splitter 242, a third thin-film beam splitter 243, a first thin-film polarization beam splitter 251, a second thin-film polarization beam splitter 252, a third thin-film polarization beam splitter 253, a first Faraday rotator 261, a second Faraday rotator 262, a third Faraday rotator 263, a first self-focusing lens 271, a second self-focusing lens 272, a third self-focusing lens 273, a first output fiber pigtail 281, a second output fiber pigtail 282, a third output fiber pigtail 283, a first detector chip 291, a second detector chip 292, and a third detector chip 293. The integrated transceiver device shown in the embodiment has the functions of light emission, detection, beam splitting / combining, and polarization / polarization. The packaging form of the integrated transceiver device of the present invention has 12 or 14 pins and 3 pigtails, and includes a ceramic substrate, a heat sink, a thermistor, a bidirectional cooling device, a pin, a nozzle (tail pipe), and a tube shell.

[0059] The working principle of the integrated transceiver device for the three-axis fiber optic gyroscope described in this embodiment is as follows: the low-polarization incoherent light beam emitted by the light source chip 211 is shaped by the beam expander and collimator lens group 221 and then enters the polarizer 231 through the optical isolation component 231. The optical isolation component 231 suppresses the influence of the return light. The single-polarization linear polarized light passes through the first thin film beam splitter 241 with a beam splitting ratio of η. B1 , is divided into a first reflected light and a first transmitted light. The first reflected light passes through the first thin film polarization beam splitter 251, and the beam splitting ratio is η P1The transmitted light passes through the first Faraday rotator 261, and then is coupled into the first output fiber optic 281 through the first self-focusing lens 271 and connected to the meter. The return light from the meter returns along the original path, and is focused by the first thin film polarization beam splitter 251 to the first detector chip 291 to record the sensitive phase. The first transmitted light passes through the second thin film beam splitter 242, and the beam splitting ratio is η B2 , is divided into a second reflected light and a second transmitted light. The second reflected light passes through the second thin film polarization beam splitter 252, and the beam splitting ratio is η P2 The transmitted light passes through the second Faraday rotator 262, and then is coupled into the second output fiber optic 282 through the second self-focusing lens 272 and connected to the meter. The return light from the meter returns along the original path, and is focused by the second thin film polarization beam splitter 252 to the second detector chip 292 to record the sensitive phase. The second transmitted light passes through the third thin film beam splitter 243, and the splitting ratio is η B3 , is divided into a third reflected light and a third transmitted light. The third reflected light passes through the third thin film polarization beam splitter 253, and the beam splitting ratio is η P3 The transmitted light passes through the third Faraday rotator 263, and then is coupled into the third output fiber optic 283 through the third self-focusing lens 273 and connected to the meter. The return light from the meter returns along the original path, and is focused by the third thin-film polarization beam splitter 253 onto the third detector chip 293 to record the sensitive phase. Wherein, the beam splitting ratio η B1 is 3:7, the beam splitting ratio η P1 is 1, the beam splitting ratio η B2 is 1, the beam splitting ratio η P2 is 1, the beam splitting ratio η B3 is 1, the beam splitting ratio η P3 is 1. By designing the beam splitting ratio, the light intensity can be adjusted.

[0060] Example 3:

[0061] According to one embodiment of the present invention, the integrated transceiver device is composed of 19 devices in total, such as Figure 3As shown, it includes a light source chip 211, a beam expansion and collimating lens group 221, an optical isolation component 231, a polarizer 232, a first thin film beam splitter 241, a second thin film beam splitter 242, a third thin film beam splitter 243, a fourth thin film beam splitter 244, a fifth thin film beam splitter 245, a sixth thin film beam splitter 246, a first self-focusing lens 271, a second self-focusing lens 272, a third self-focusing lens 273, a first output fiber pigtail 281, a second output fiber pigtail 282, a third output fiber pigtail 283, a first detector chip 291, a second detector chip 292, and a third detector chip 293. The integrated transceiver device shown in the embodiment has the functions of light emission, detection, beam splitting / combining, and polarization. The package of the integrated transceiver device described in the present invention has 12 or 14 pins and 3 fiber pigtails, and includes a ceramic substrate, a heat sink, a thermistor, a bidirectional cooling device, a pin, a nozzle (tail pipe), and a tube shell.

[0062] The working principle of the integrated transceiver device for the three-axis fiber optic gyroscope described in this embodiment is as follows: the low-polarization incoherent light beam emitted by the light source chip 211 is shaped by the beam expansion and collimating lens group 221, passes through the optical isolation component 231 and enters the polarizer 232. The single-polarization linear polarized light passes through the first thin film beam splitter 241 with a beam splitting ratio of η. B1 , is divided into a first reflected light and a first transmitted light. The first reflected light passes through the fourth thin film beam splitter 244, and the beam splitting ratio is η P1 The transmitted light is coupled into the first output fiber optic 281 through the first self-focusing lens 271 and connected to the meter. The return light from the meter returns along the original path and enters the first detector chip 291 through the fourth film beam splitter 244 to record the sensitive phase. The first transmitted light passes through the second film beam splitter 242 with a splitting ratio of η B2 , is divided into a second reflected light and a second transmitted light. The second reflected light passes through the fifth thin film beam splitter 245, and the beam splitting ratio is η P2 The transmitted light is coupled into the second output fiber optic 282 through the second self-focusing lens 272 and connected to the meter head. The return light from the meter head returns along the original path and enters the second detector chip 292 through the fifth film beam splitter 245 to record the sensitive phase. The second transmitted light passes through the third film beam splitter 243 with a splitting ratio of η B3 , is divided into a third reflected light and a third transmitted light. The third reflected light passes through the sixth thin film beam splitter 246, and the beam splitting ratio is η P3 The transmitted light is coupled into the third output fiber 283 through the third self-focusing lens 273 and connected to the meter head. The return light from the meter head returns along the original path, passes through the third film beam splitter 246 and enters the third detector chip 293 to record the sensitive phase. Wherein, the beam splitting ratio η B1 is 3:7, the beam splitting ratio η P1 is 1, the beam splitting ratio η B2 is 1, the beam splitting ratio η P2 is 1, the beam splitting ratio ηB3 is 1, the beam splitting ratio η P3 is 1.

[0063] Example 4:

[0064] According to one embodiment of the present invention, the integrated transceiver device is composed of 20 devices in total, such as Figure 4 As shown, it includes a light source chip 211, a beam expander and collimator lens group 221, an optical isolation component 231, an optical isolation component 232, a polarizer 232, a first thin film beam splitter 241, a second thin film beam splitter 242, a third thin film beam splitter 243, a fourth thin film beam splitter 244, a fifth thin film beam splitter 245, a sixth thin film beam splitter 246, a first self-focusing lens 271, a second self-focusing lens 272, a third self-focusing lens 273, a first output fiber pigtail 281, a second output fiber pigtail 282, a third output fiber pigtail 283, a first detector chip 291, a second detector chip 292, a third detector chip 293, and a fourth detector chip 294. The integrated transceiver device shown in the embodiment has the functions of light emission, detection, beam splitting / combining, and polarization. The packaging form of the integrated transceiver device of the present invention has 12 or 14 pins and 3 pigtails, and includes a ceramic substrate, a heat sink, a thermistor, a bidirectional cooling device, a pin, a nozzle (tail pipe), and a tube shell.

[0065] The working principle of the integrated transceiver device for the three-axis fiber optic gyroscope described in this embodiment is as follows: the low-polarization incoherent light beam emitted by the light source chip 211 is shaped by the beam expansion and collimating lens group 221, passes through the optical isolation component 231 and enters the polarizer 232. The single-polarization linear polarized light passes through the first thin film beam splitter 241 with a beam splitting ratio of η. B1 , is divided into a first reflected light and a first transmitted light. The first reflected light passes through the fourth thin film beam splitter 244, and the beam splitting ratio is η P1 The transmitted light is coupled into the first output fiber optic 281 through the first self-focusing lens 271 and connected to the meter. The return light from the meter returns along the original path and enters the first detector chip 291 through the fourth film beam splitter 244 to record the sensitive phase. The first transmitted light passes through the second film beam splitter 242 with a splitting ratio of η B2 , is divided into a second reflected light and a second transmitted light. The second reflected light passes through the fifth thin film beam splitter 245, and the beam splitting ratio is η P2 The transmitted light is coupled into the second output fiber optic 282 through the second self-focusing lens 272 and connected to the meter head. The return light from the meter head returns along the original path and enters the second detector chip 292 through the fifth film beam splitter 245 to record the sensitive phase. The second transmitted light passes through the third film beam splitter 243 with a splitting ratio of η B3 , is divided into a third reflected light and a third transmitted light. The third reflected light passes through the sixth thin film beam splitter 246, and the beam splitting ratio is η P3The transmitted light is coupled into the third output fiber optic 283 through the third self-focusing lens 273 and connected to the meter. The return light from the meter returns along the original path, passes through the third thin film beam splitter 246, and enters the third detector chip 293 to record the sensitive phase. The third transmitted light is captured by the fourth detector chip 294 for power compensation and stabilization. B1 is 1:4, the beam splitting ratio η P1 is 1, the beam splitting ratio η B2 is 1:3, the beam splitting ratio η P2 is 1, the beam splitting ratio η B3 is 1, the beam splitting ratio η P3 is 1.

[0066] Embodiment 5:

[0067] The difference from the first embodiment is that the volume of the integrated transceiver device is reduced by changing the structure of the light adjustment unit. Figure 5 As shown, the beam expander and collimator lens group 221 includes a 45° reflector. The low-polarization incoherent light beam emitted by the light source chip 211 enters the polarizer 232 through the optical isolation component 231. The linearly polarized light is shaped by the beam expander and collimator lens group 221 and refracted 90° by the 45° reflector to enter the first thin film beam splitter.

[0068] Example 6:

[0069] The difference from the second embodiment is that the volume of the integrated transceiver device is reduced by changing the structure of the light adjustment unit. Figure 6 As shown, the beam expander and collimator lens group 221 includes a 45° reflector. The low-polarization incoherent light beam emitted by the light source chip 211 enters the polarizer 232 through the optical isolation component 231. The linearly polarized light is shaped by the beam expander and collimator lens group 221 and refracted 90° by the 45° reflector to enter the first thin film beam splitter.

[0070] Embodiment seven:

[0071] The difference from the third embodiment is that the volume of the integrated transceiver device is reduced by changing the structure of the light adjustment unit. Figure 7 As shown, the beam expander and collimator lens group 221 includes a 45° reflector. The low-polarization incoherent light beam emitted by the light source chip 211 enters the polarizer 232 through the optical isolation component 231. The linearly polarized light is shaped by the beam expander and collimator lens group 221 and refracted 90° by the 45° reflector to enter the first thin film beam splitter.

[0072] Embodiment 8:

[0073] The difference from the fourth embodiment is that the volume of the integrated transceiver device is reduced by changing the structure of the light adjustment unit. Figure 8As shown, the beam expander and collimator lens group 221 includes a 45° reflector. The low-polarization incoherent light beam emitted by the light source chip 211 enters the polarizer 232 through the optical isolation component 231. The linearly polarized light is shaped by the beam expander and collimator lens group 221 and refracted 90° by the 45° reflector to enter the first thin film beam splitter.

[0074] The above embodiments all have the following packaging forms. The packaging form of the three-axis fiber optic gyroscope integrated transceiver device is as follows: Figure 9 As shown, the whole is a metal package, which has 12 or 14 electrical pins and 3 output fiber pigtails depending on the internal structure, including a ceramic substrate, a heat sink, a thermistor, a bidirectional cooling device, a pin, a nozzle (tail pipe), and a shell.

[0075] The integrated transceiver device described in the present invention is composed of three layers. The first layer is the device layer, the second layer is the device structure layer, and the third layer is the base structure layer. Specifically, the first layer includes an SLD light source chip A1, a thermistor A2, an optical device A3 (beam expansion and collimating lens, a polarizer, a thin film beam splitter, a thin film polarization beam splitter, a Faraday rotator, a self-focusing lens fiber assembly, etc.) and a detector A4; the second layer includes a transition heat sink B1, a heat sink B2, an optical device fixing seat B3, a detector fixing and coupling structure B4, etc.; the third layer includes a refrigerator C1, an optical device substrate C2, and a device overall substrate C3. The first layer is the main layer that realizes the function of the device; the second layer is the structural layer that ensures the normal operation of the device and enhances the environmental adaptability of the device; the third layer is the structural layer for external output and fixing. The upper surface of the device substrate C3 includes a cooler C1 and an optical device substrate C2. A heat sink B2 and a transition heat sink B1 are arranged on the upper surface of the cooler C1 from bottom to top. The light source chip A1 and the thermistor A2 are arranged on the transition heat sink B1. The optical device A3 is arranged on the optical device substrate C2 via an optical device fixing seat B3. The detector A4 is arranged on the optical device substrate C2 via a detector fixing and coupling structure B4. The light source chip A1, the optical device A3, and the detector A4 are arranged according to the aforementioned optical path. Figure 10 As shown, the device is surrounded by a metal tube shell and has pins, a nozzle (tail tube) and a pigtail.

[0076] Preferably, the light source is a superluminescent diode (SLD).

[0077] Preferably, the detector is a PIN-FET component or a PIN-TIA component.

[0078] Preferably, the transition heat sink is made of ceramic material, which is in direct contact with the light source chip and has the functions of fixing the light source and directionally conducting the heat of the light source.

[0079] Preferably, the cooler is a bidirectional cooler, which is a structural part connecting the heat sink and the substrate layer. The temperature of the light source chip is controlled by adjusting the voltage of the bidirectional cooler according to the feedback information of the thermistor.

[0080] Preferably, the light source chip, the thermistor and the transition heat sink are soldered together by adding solder.

[0081] Preferably, the detector is soldered to the fixing structure by adding solder.

[0082] Preferably, the optical path components (beam expansion collimator, polarizer, thin film beam splitter, thin film polarization beam splitter, Faraday rotator, self-focusing lens fiber assembly) are fixed on the fixing seat by glue dispensing.

[0083] Preferably, the output fiber pigtail of the integrated transceiver device of the three-axis fiber optic gyroscope is output through a nozzle, and the nozzle can protect the pigtail to prevent it from breaking.

[0084] Features described and / or illustrated above for one embodiment may be used in the same or similar manner in one or more other embodiments, and / or combined with or used in place of features in other embodiments.

[0085] It should be emphasized that the term "include / comprises" when used herein refers to the presence of features, integers, steps or components, but does not exclude the presence or addition of one or more other features, integers, steps, components or combinations thereof.

[0086] The many features and advantages of these embodiments are apparent from this detailed description, and thus, the appended claims are intended to cover all such features and advantages of these embodiments that fall within the true spirit and scope thereof. Furthermore, since numerous modifications and changes will readily occur to those skilled in the art, it is not intended that the embodiments of the invention be limited to the exact construction and operation illustrated and described, but rather that all suitable modifications and equivalents be covered within the scope thereof.

[0087] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

[0088] Parts of the present invention that are not described in detail are well known to those skilled in the art.

Claims

1. An integrated transceiver device for a three-axis fiber optic gyroscope, characterized in that: It includes a light source, a light adjustment unit, three thin film beam splitters, three light coupling units, three self-focusing lenses, three optical fibers, and three detectors; The light output by the light source is converted into linearly polarized light by the light adjustment unit, and the linearly polarized light is incident on the first thin film beam splitter and is divided into a first reflected light and a first transmitted light; The first reflected light is coupled into an optical fiber through a first optical coupling unit and a first self-focusing lens, the optical fiber is connected to a meter head, and the return light from the meter head is focused onto a first detector through the first optical coupling unit; The first transmitted light is incident on the second thin film beam splitter and is divided into a second reflected light and a second transmitted light. The second reflected light is coupled into an optical fiber through a second optical coupling unit and a second self-focusing lens. The optical fiber is connected to a meter head. The return light from the meter head is focused onto a second detector through the second optical coupling unit. The second transmitted light is incident on the third thin film beam splitter and is divided into a third reflected light and a third transmitted light. The third reflected light is coupled into an optical fiber through a third optical coupling unit and a third self-focusing lens. The optical fiber is connected to a meter head. The return light from the meter head is converged to a third detector through the third optical coupling unit.

2. The integrated transceiver device for a three-axis fiber optic gyroscope according to claim 1, characterized in that: The light adjustment unit includes a beam expansion and collimating lens assembly, a light isolation assembly, and a polarizer which are connected in sequence.

3. The integrated transceiver device for a three-axis fiber optic gyroscope according to claim 1, characterized in that: The light adjustment unit includes an optical isolation component, a polarizer, and a beam expander collimating lens component connected in sequence. The beam expander collimating lens component includes a 45° reflector for turning the light output from the light source 90° and inputting the light into the first film beam splitter.

4. The integrated transceiver device for a three-axis fiber optic gyroscope according to claim 1, characterized in that: The optical coupling unit is a thin film beam splitter.

5. The integrated transceiver device for a three-axis fiber optic gyroscope according to claim 1, characterized in that: The optical coupling unit includes a thin film polarization beam splitter and a Faraday rotator, wherein the Faraday rotator rotates the incident light by 45°; and the splitting ratio of the thin film polarization beam splitter is 1:

1.

6. The integrated transceiver device for a three-axis fiber optic gyroscope according to any one of claims 1 to 5, characterized in that: The beam splitting ratios of the first, second and third thin film beam splitters are 1:4, 1:3 and 1:1 respectively.

7. The integrated transceiver device for a three-axis fiber optic gyroscope according to any one of claims 1 to 5, characterized in that: It also includes a fourth detector for detecting the third transmitted light and performing power compensation. The splitting ratios of the first, second and third thin film beam splitters are 3:7, 1:1 and 1:1 respectively.

8. An integrated transceiver packaging structure for a three-axis fiber optic gyroscope, characterized in that: The integrated transceiver device for a three-axis fiber optic gyroscope is the integrated transceiver device for a three-axis fiber optic gyroscope according to any one of claims 1 to 7; The integrated transceiver device packaging structure for the three-axis fiber optic gyroscope adopts a three-layer layout, wherein the first layer includes a light source, a thermistor, an optical device, and a detector; the second layer includes a transition heat sink, a heat sink, a fixing seat, and a fixing structure; the third layer includes a refrigerator, an optical device substrate, and an overall device substrate; the upper surface of the overall device substrate includes a refrigerator and an optical device substrate; a heat sink and a transition heat sink are arranged on the upper surface of the refrigerator from bottom to top; the light source chip and the thermistor are arranged on the transition heat sink; the optical device is arranged on the optical device substrate via a fixing seat; and the detector is arranged on the optical device substrate via a fixing structure; The optical device includes a light adjustment unit, a thin film beam splitter, a light coupling unit, a self-focusing lens, and an optical fiber. The light source, the optical device, and the detector are arranged according to the optical path of any one of claims 1 to 7.

9. The integrated transceiver packaging structure for a three-axis fiber optic gyroscope according to claim 8, characterized in that: The light source is a superluminescent diode, the detector is a PIN-FET component or a PIN-TIA component, the transition heat sink is made of ceramic material, and the cooler is a bidirectional cooler.

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