Low crosstalk optoelectronic co-sealed three-axis integrated transceiver module and fiber optic gyroscope

Abstract

The present invention discloses a low crosstalk optoelectronic co-sealed three-axis integrated transceiver module and an optical fiber gyroscope. By arranging the light source assembly, the first to sixth beam splitting prisms, and the lithium niobate thin film waveguide chip, the light signal's splitting, beam combining, polarization, and modulation functions are completed. On this basis, by designing three detectors on the transmission path of the optical signal to be measured, the optical signal to be measured can be detected and photoelectrically converted. Since the optical signal to be measured carries the information of the measured current, the measured current can be finally obtained by analyzing the electrical signal output by the detector through the processing circuit. Through the above scheme of the present invention, the integration of the optical path and the circuit part is realized, forming a three-axis optical and optical receiving and transmitting circuit and an optoelectronic co-sealed design, realizing a three-axis integrated structural design and transceiver function, and having the advantages of miniaturization, low crosstalk, high integration, and high reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of optoelectronic devices for fiber optic gyroscopes, and in particular to a low-crosstalk optoelectronic co-sealed three-axis integrated transceiver module and a fiber optic gyroscope. Background Art

[0002] Fiber optic gyroscope is a high-performance inertial sensing device based on the Sagnec effect, which has the characteristics of full solid-state, low noise, strong resistance to environmental interference, and full precision coverage. With the development of inertial guided missiles, drones, the Internet of Things, and autonomous driving technology, higher requirements are put forward for the SWaP (size, weight, power consumption, and cost) comprehensive performance indicators of medium and low precision fiber optic gyroscopes in order to expand the application field and form a competitive advantage with MEMS gyroscopes, which also forces traditional fiber optic gyroscopes to change in the direction of miniaturization, low cost, and high reliability.

[0003] like Figure 1 As shown in FIG. 1 , the fiber optic gyroscope system is composed of: a light source, a coupler, a Y waveguide, an electrode for phase modulation of the optical signal in the Y waveguide, a fiber ring, a detector, a signal source, a lock-in amplification circuit, and a communication line for realizing the gyroscope output. The traditional fiber optic gyroscope is connected by optical paths through optical fiber fusion by separate devices, which is large in size and complex in assembly. Summary of the invention

[0004] The technical problem to be solved by the present invention is that each component in a traditional fiber optic gyroscope is a separate device, and different separate devices are optically connected by optical fiber fusion splicing, which results in a large size and complex assembly of the fiber optic gyroscope, thereby providing a low crosstalk optoelectronic co-sealed three-axis integrated transceiver module and a fiber optic gyroscope.

[0005] In a first aspect, the technical solution of the present application provides a low crosstalk optoelectronic co-sealed three-axis integrated transceiver module, comprising:

[0006] A light source assembly, emitting a light signal;

[0007] A first beam splitter prism, a second beam splitter prism and a third beam splitter prism are arranged in sequence along the transmission direction of the optical signal;

[0008] The fourth beam splitter prism, the fifth beam splitter prism and the sixth beam splitter prism are respectively and correspondingly arranged on the reflected light transmission path of the first beam splitter prism, the reflected light transmission path of the second beam splitter prism and the reflected light transmission path of the third beam splitter prism;

[0009] A lithium niobate thin film waveguide chip, comprising a first lithium niobate thin film waveguide, a second lithium niobate thin film waveguide and a third lithium niobate thin film waveguide, wherein the first lithium niobate thin film waveguide is arranged on the transmission path of the transmitted light of the fourth beam splitter prism, the second lithium niobate thin film waveguide is arranged on the transmission path of the transmitted light of the fifth beam splitter prism, and the third lithium niobate thin film waveguide is arranged on the transmission path of the transmitted light of the sixth beam splitter prism; the lithium niobate thin film waveguide chip is connected to a sensing optical fiber ring through a polarization-maintaining optical fiber, and the sensing optical fiber ring outputs a measured optical signal carrying measured current information to the lithium niobate thin film waveguide chip; the measured optical signal is transmitted to the fourth beam splitter prism, the fifth beam splitter prism and the sixth beam splitter prism via the first lithium niobate thin film waveguide, the second lithium niobate thin film waveguide and the third lithium niobate thin film waveguide;

[0010] The first detector, the second detector and the third detector are respectively and correspondingly arranged on the reflected light transmission path of the fourth beam splitter prism, the reflected light transmission path of the fifth beam splitter prism and the reflected light transmission path of the sixth beam splitter prism, and detect the optical signal to be measured including the measured optical signal reflected by the fourth beam splitter prism, the fifth beam splitter prism and the sixth beam splitter prism, and convert the optical signal to be measured into an electrical signal to be measured;

[0011] The processing circuit receives the electrical signals to be measured output by the first detector, the second detector and the third detector, and parses out the measured current.

[0012] In some embodiments, the low crosstalk optoelectronic co-sealed three-axis integrated transceiver module, the light source assembly includes:

[0013] A laser chip for emitting laser signals;

[0014] A collimating lens, arranged in the transmission direction of the laser signal, to focus the laser signal to obtain the optical signal;

[0015] The laser isolation baffle is provided with a circular hole corresponding to the central axis of the collimating lens, and the optical signal is transmitted through the circular hole.

[0016] The low crosstalk optoelectronic co-sealed three-axis integrated transceiver module described in some solutions also includes a temperature regulator:

[0017] The light source assembly, the first detector, the second detector, the third detector and the processing circuit are all arranged on the temperature regulator;

[0018] The light source assembly further comprises a thermal sensor, which detects the temperature value of the laser chip and sends the temperature value to the control module of the temperature regulator;

[0019] The control module controls the temperature regulator to keep the temperature value within a set range.

[0020] In some embodiments of the low crosstalk optoelectronic co-sealed three-axis integrated transceiver module, the transmittance: reflectivity of the first beam splitter prism is 2:1;

[0021] The transmittance:reflectivity of the second beam splitter prism, the fourth beam splitter prism, the fifth beam splitter prism and the sixth beam splitter prism=1:1;

[0022] The third beam splitter prism is a total reflection prism.

[0023] The low crosstalk optoelectronic co-sealed three-axis integrated transceiver module described in some solutions also includes:

[0024] A first focusing lens is disposed between the fourth beam splitter prism and the first detector;

[0025] A second focusing lens is disposed between the fifth beam splitter prism and the second detector;

[0026] A third focusing lens is disposed between the sixth beam splitter prism and the third detector;

[0027] a fourth focusing lens, disposed between the fourth beam splitter prism and the first lithium niobate thin film waveguide;

[0028] a fifth focusing lens, disposed between the fifth beam splitter prism and the second lithium niobate thin film waveguide;

[0029] The sixth focusing lens is disposed between the sixth beam splitter prism and the third lithium niobate thin film waveguide.

[0030] In some schemes, the low-crosstalk optoelectronic co-sealed three-axis integrated transceiver module is described, and the input ends of the first lithium niobate thin film waveguide, the second lithium niobate thin film waveguide and the third lithium niobate thin film waveguide are all provided with a curved section, and the curved section includes two cascaded semicircular sections, and the opening directions of the two semicircular sections are opposite.

[0031] In some schemes, the low crosstalk optoelectronic co-sealed three-axis integrated transceiver module described in the embodiment has a waveguide width of 0.8-1.2 μm in the curved section and a diameter of 150-400 μm in the semicircular section.

[0032] In some schemes, the low-crosstalk optoelectronic co-sealed three-axis integrated transceiver module is described, wherein the output ends of the first lithium niobate thin film waveguide, the second lithium niobate thin film waveguide and the third lithium niobate thin film waveguide are configured with fixed axis blocks, and the polarization-maintaining optical fiber is arranged in the fixed axis block.

[0033] The low crosstalk optoelectronic co-sealed three-axis integrated transceiver module described in some solutions also includes:

[0034] The detector isolation baffle is formed with a lens isolation enclosure for isolating the first focusing lens, the second focusing lens and the third focusing lens, and a detector isolation enclosure for isolating the first detector, the second detector and the third detector, and the lens isolation enclosure is formed with a pair of through holes suitable for light beams to pass through.

[0035] In a second aspect, the technical solution of the present application provides a fiber optic gyroscope, comprising the low-crosstalk optoelectronic co-sealed three-axis integrated transceiver module described in any one of the first aspects.

[0036] Compared with the prior art solutions, the above technical solutions provided by the present invention have the following technical effects:

[0037] The low crosstalk optoelectronic co-sealed three-axis integrated transceiver module and fiber optic gyroscope provided by the present invention completes the splitting, beam combining, polarization and modulation functions of the optical signal by arranging the light source assembly, the first to sixth beam splitting prisms, and the lithium niobate thin film waveguide chip. On this basis, by designing three detectors on the transmission path of the optical signal to be measured, the optical signal to be measured can be detected and photoelectrically converted. Since the optical signal to be measured carries the information of the measured current, the measured current can be obtained by finally analyzing the electrical signal output by the detector through the processing circuit. Through the above scheme of the present invention, the integration of the optical path and the circuit part is realized, forming a three-axis optical and optical receiving and transmitting circuit and optoelectronic co-sealing design, realizing the three-axis integrated structural design and transceiver function, and having the advantages of miniaturization, low crosstalk, high integration, high reliability, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the structure of a fiber optic gyroscope in the prior art;

[0039] Figure 2 A three-dimensional diagram of a low crosstalk optoelectronic co-sealed three-axis integrated transceiver module according to an embodiment of the present invention;

[0040] Figure 3 A top view of a low crosstalk optoelectronic co-sealed three-axis integrated transceiver module according to an embodiment of the present invention;

[0041] Figure 4 A schematic diagram of a lithium niobate thin film waveguide structure according to an embodiment of the present invention;

[0042] Figure 5 A schematic top view of a lithium niobate thin film waveguide chip structure according to an embodiment of the present invention;

[0043] Figure 6A three-dimensional schematic diagram of a lithium niobate thin film waveguide chip structure according to an embodiment of the present invention;

[0044] Figure 7 A schematic top view of a light source assembly structure according to an embodiment of the present invention;

[0045] Figure 8 A three-dimensional schematic diagram of a light source assembly structure according to an embodiment of the present invention;

[0046] Fig. 9 The figure is a three-dimensional schematic diagram of a detector according to an embodiment of the present invention.

[0047] In the above, the reference numerals in the figures represent:

[0048] 1-laser driving circuit, 2-laser chip, 3-collimating lens, 4-laser isolation baffle, 5-first beam splitter prism, 6-second beam splitter prism, 7-third beam splitter prism, 61-fourth beam splitter prism, 62-fifth beam splitter prism, 63-sixth beam splitter prism, 8-detector isolation baffle, 91-first focusing lens, 92-second focusing lens, 93-third focusing lens, 94-fourth focusing lens, 95-fifth focusing lens, 96-sixth focusing lens, 11-processing circuit, 101-first detector, 102-second detector, 103-third detector, 104-sensitive surface, 12-lithium niobate thin film waveguide chip, 13-modulation circuit board, 14-temperature regulator, 21-thermal sensor, 22-light-emitting unit, 121-optical waveguide, 1211-bending section, 122-modulation electrode, 123-fixed axis block, 124-polarization-maintaining optical fiber. DETAILED DESCRIPTION

[0049] The specific implementation of the present application is further described below with reference to the accompanying drawings.

[0050] It is easy to understand that according to the technical solution of the present application, without changing the essential spirit of the present application, a variety of structural modes and implementation modes that can be replaced by those skilled in the art can be replaced with each other. Therefore, the following specific implementation modes and drawings are only exemplary descriptions of the technical solution of the present application, and should not be regarded as the entirety of the present application or as a limitation or restriction on the technical solution of the application.

[0051] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. They are relative concepts and may change accordingly according to different positions and different usage conditions. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0052] The present application provides a low crosstalk optoelectronic co-sealed three-axis integrated transceiver module, such as Figure 2 and Figure 3 As shown, including:

[0053] The light source assembly emits a light signal; the light source assembly includes a laser driving circuit 1, a laser chip 2 and a collimating lens 3, and the collimating lens 3 can output a collimated light signal.

[0054] The first beam splitter prism 5, the second beam splitter prism 6 and the third beam splitter prism 7 are sequentially arranged along the transmission direction of the optical signal; as shown in the figure, the first beam splitter prism 5, the second beam splitter prism 6 and the third beam splitter prism 7 are sequentially arranged on the optical path of the optical signal output by the collimating lens 3. It can be understood that the spacing distance between the collimating lens 3 and the laser chip 2 is determined according to the focal length of the collimating lens 3 to ensure the collimating effect of the collimating lens 3.

[0055] The fourth beam splitter prism 61, the fifth beam splitter prism 62 and the sixth beam splitter prism 63 are respectively and correspondingly arranged on the reflected light transmission path of the first beam splitter prism 5, the reflected light transmission path of the second beam splitter prism 6 and the reflected light transmission path of the third beam splitter prism 7; as shown in the figure, the first beam splitter prism 5 transmits transmitted light to the second beam splitter prism 6, and the reflected light is transmitted to the fourth beam splitter prism 61; the second beam splitter prism 6 transmits transmitted light to the third beam splitter prism 7, and the reflected light is transmitted to the fifth beam splitter prism 62; the third beam splitter prism 7 may not have transmitted light, and the reflected light is transmitted to the sixth beam splitter prism 63.

[0056] The lithium niobate thin film waveguide chip 12 includes a first lithium niobate thin film waveguide, a second lithium niobate thin film waveguide and a third lithium niobate thin film waveguide, wherein the first lithium niobate thin film waveguide is arranged on the transmission path of the transmitted light of the fourth beam splitter prism 61, the second lithium niobate thin film waveguide is arranged on the transmission path of the transmitted light of the fifth beam splitter prism 62, and the third lithium niobate thin film waveguide is arranged on the transmission path of the transmitted light of the sixth beam splitter prism 63; Figure 1 As shown, the lithium niobate thin film waveguide chip is connected to the sensing fiber ring through a polarization-maintaining optical fiber, and the sensing fiber ring outputs a measured optical signal carrying the measured current information to the lithium niobate thin film waveguide chip 12; the measured optical signal is transmitted to the fourth beam splitter prism 61, the fifth beam splitter prism 62 and the sixth beam splitter prism 63 through the first lithium niobate thin film waveguide, the second lithium niobate thin film waveguide and the third lithium niobate thin film waveguide; it can be understood that three sensing fiber rings need to be connected in this solution. Each sensing fiber ring outputs a measured optical signal having a corresponding relationship with the measured current information transmitted by the conductor in its ring.

[0057] The first detector 101, the second detector 102 and the third detector 103 are respectively and correspondingly arranged on the reflected light transmission path of the fourth beam splitter prism 61, the reflected light transmission path of the fifth beam splitter prism 62 and the reflected light transmission path of the sixth beam splitter prism 63, to detect the optical signal to be measured including the measured optical signal reflected by the fourth beam splitter prism 61, the fifth beam splitter prism 62 and the sixth beam splitter prism 63 and convert the optical signal to be measured into an electrical signal to be measured; the reflected light transmission path of the fourth beam splitter prism 61, the reflected light transmission path of the fifth beam splitter prism 62 and the reflected light transmission path of the sixth beam splitter prism 63 mentioned above refers to the reflected light transmission path when the optical signal is transmitted from the lithium niobate thin film waveguide chip 12.

[0058] The processing circuit 11 receives the electrical signals to be measured output by the first detector 101 , the second detector 102 and the third detector 103 , and parses out the current to be measured.

[0059] The above-mentioned low crosstalk optoelectronic co-sealed three-axis integrated transceiver module disclosed in this embodiment completes the splitting, beam combining, polarization and modulation functions of the optical signal by arranging the light source assembly, the first to sixth beam splitting prisms, and the lithium niobate thin film waveguide chip. By designing three detectors on the transmission path of the optical signal to be measured, the optical signal to be measured can be detected and photoelectrically converted. Since the optical signal to be measured carries the information of the measured current, the measured current can be finally obtained by analyzing the electrical signal output by the detector through the processing circuit. Through the above-mentioned scheme of the present invention, the integration of the optical path and the circuit part is realized, forming a three-axis optical and optical receiving and transmitting circuit and optoelectronic co-sealing design, realizing the three-axis integrated structural design and transceiver function, and having the advantages of miniaturization, low crosstalk, high integration, high reliability, etc.

[0060] As mentioned above, the light source assembly in the above scheme includes a laser chip 2 for emitting a laser signal; a collimating lens 3, which is arranged in the transmission direction of the laser signal to focus the laser signal to obtain the optical signal; on this basis, the light source assembly also includes a laser isolation baffle 4, which is provided with a circular hole corresponding to the central axis of the collimating lens 3, and the optical signal is transmitted through the circular hole. In this scheme, in order to avoid the influence of non-working light on the working optical path, a laser isolation baffle 4 is provided, and the laser isolation baffle 4 can block the stray light of the laser chip 2 and other interfering light.

[0061] Furthermore, in the above scheme, the transmittance:reflectance of the first beam splitter prism 5 is 2:1; the transmittance:reflectance of the second beam splitter prism 6, the fourth beam splitter prism 61, the fifth beam splitter prism 62 and the sixth beam splitter prism 63 is 1:1; the third beam splitter prism 7 is a total reflection prism. By setting the ratio of the transmittance to the reflectance of each of the above beam splitter prisms, using beam splitters with different splitting ratios can achieve the goal of evenly distributing the light signal emitted by the light source assembly to the subsequent light path.

[0062] In some embodiments of the present invention, Figure 2 and Figure 3 As shown, it also includes a first focusing lens 91, which is arranged between the fourth beam splitter prism 61 and the first detector 101; a second focusing lens 92, which is arranged between the fifth beam splitter prism 62 and the second detector 102; a third focusing lens 93, which is arranged between the sixth beam splitter prism 63 and the third detector 103; a fourth focusing lens 94, which is arranged between the fourth beam splitter prism 61 and the first lithium niobate film waveguide; a fifth focusing lens 95, which is arranged between the fifth beam splitter prism 62 and the second lithium niobate film waveguide; and a sixth focusing lens 96, which is arranged between the sixth beam splitter prism 63 and the third lithium niobate film waveguide. The arrangement of the above-mentioned focusing lenses can ensure that the optical signal entering the lithium niobate film waveguide and the optical signal detected by the detector are both focused, so as to achieve efficient coupling of the optical signal to the lithium niobate film waveguide and the detector. In this scheme, a lithium niobate thin film waveguide chip with excellent electro-optic tuning effect is selected to realize the electro-optic modulation part, which has the advantages of high modulation efficiency, good linearity, high chip polarization extinction ratio, small size and easy integration.

[0063] Furthermore, if Figures 4 to 6As shown, the optical waveguide 121 at the input end of the first lithium niobate thin film waveguide, the second lithium niobate thin film waveguide and the third lithium niobate thin film waveguide is provided with a curved section 1211, and the curved section 1211 includes two cascaded semicircular sections, and the opening directions of the two semicircular sections are opposite. By designing the structure of the curved section at the input end of the first lithium niobate thin film waveguide, the second lithium niobate thin film waveguide and the third lithium niobate thin film waveguide, the TM mode entering the first lithium niobate thin film waveguide, the second lithium niobate thin film waveguide and the third lithium niobate thin film waveguide can be filtered out, so as to realize the TE single polarization mode operation required by the optical fiber gyroscope system. Specifically, the waveguide width of the curved section 1211 is preferably 0.8-1.2μm, and more preferably 0.9-1.1μm; the diameter of the semicircular section is 150-400μm, and more preferably 200-300μm. In the above scheme, the first semicircular segment in the curved segment 1211 can achieve an extinction ratio of 20-25dB. The second semicircular segment further filters out the TM mode on the basis of the first semicircular segment, and can achieve an extinction ratio of 30-35dB. The waveguide width design can meet the single-mode transmission conditions.

[0064] In addition, as shown in the figure, similar to the structure of the existing lithium niobate thin film waveguide, the first lithium niobate thin film waveguide, the second lithium niobate thin film waveguide and the third lithium niobate thin film waveguide in this scheme all include Y waveguides, and the TE mode optical signal enters the two branch arms of the Y waveguide, passes through the modulation electrode 122 designed around the two branch arms of the Y waveguide, and controls the current and voltage of the modulation electrode 122 through the modulation circuit board 13 to realize signal modulation, thereby completing the bias modulation and feedback control of the gyroscope.

[0065] In the above structure, if Figures 4 to 6 As shown, the output ends of the first lithium niobate thin film waveguide, the second lithium niobate thin film waveguide and the third lithium niobate thin film waveguide are provided with an axis-fixing block 123, and the polarization-maintaining optical fiber 124 is arranged in the axis-fixing block 123. The axis-fixing block 123 is used to assist the polarization-maintaining optical fiber 124 in aligning the optical axes with the first lithium niobate thin film waveguide, the second lithium niobate thin film waveguide and the third lithium niobate thin film waveguide, thereby reducing the difficulty of operation and improving the alignment effect.

[0066] In some embodiments, the low crosstalk optoelectronic co-sealed three-axis integrated transceiver module further includes a temperature regulator 14, such as Figure 2 As shown, the light source assembly, the first detector 101, the second detector 102, the third detector 103 and the processing circuit 11 are all arranged on the temperature regulator 14; Figure 7 and Figure 8As shown, the laser chip includes a thermal sensor 21 and a light-emitting unit 22. The thermal sensor 21 detects the temperature value of the laser chip 2 and sends the temperature value to the control module of the temperature regulator 14; the control module controls the temperature regulator 14 to keep the temperature value within a set range. The thermal sensor 21 shown can be a thermistor, and its resistance changes when the temperature changes. In this solution, the temperature regulator 14 is used to achieve cooling of the light source assembly and other circuit elements, while avoiding DC drift of the lithium niobate thin film waveguide chip, and ensuring efficient and stable operation of the laser chip and the lithium niobate thin film waveguide chip by constant temperature. In the above solution, the temperature regulator 14 can be implemented by a thermoelectric cooler.

[0067] Combination Figure 1 and Figure 2 As shown, the low crosstalk optoelectronic co-sealed three-axis integrated transceiver module also includes a detector isolation baffle 8, which is formed with a lens isolation enclosure for isolating the first focusing lens 91, the second focusing lens 92 and the third focusing lens 93, and a detector isolation enclosure for isolating the first detector 101, the second detector 102 and the third detector 103, and the lens isolation enclosure is formed with a pair of through holes suitable for light beams to pass through. Fig. 9 As shown, each detector has a sensitive surface 104, and a through hole on the lens isolation enclosure is opposite to the sensitive surface 104, ensuring that the detector can detect the measured light signal. The detector isolation baffle 8 is used to isolate the optical signals of detectors in different channels to avoid optical crosstalk between channels. Furthermore, in terms of electrical crosstalk, different spatial layouts are used to separate the laser drive circuit 1, the processing circuit 11 and the modulation circuit board 13, and the laser isolation baffle 4 and the detector isolation baffle 8 are combined to isolate and reduce the crosstalk of electrical signals.

[0068] The embodiment of the present application also provides a fiber optic gyroscope, comprising the low crosstalk optoelectronic co-sealed three-axis integrated transceiver module described in any of the above solutions. Figure 1Compared with the prior art shown in the figure, the fiber optic gyroscope in the present scheme utilizes the low crosstalk optoelectronic co-sealed three-axis integrated transceiver module proposed in the aforementioned scheme, which covers the structural design of the optical path and the circuit, and has the advantages of high integration, small size and low cost. Since the low crosstalk optoelectronic co-sealed three-axis integrated transceiver module adopts a micro-assembly splitting scheme, a relatively simple multi-path splitting light receiving and transmitting circuit is realized, and the unfavorable factors such as the design difficulty and optical crosstalk introduced by the waveguide crossing in the monolithic integrated chip in the fiber optic gyroscope are avoided. In addition, in the present scheme, a lithium niobate thin film waveguide chip with excellent electro-optical tuning effect is selected to realize the electro-optical modulation part, which has the advantages of high modulation efficiency, good linearity, high chip polarization extinction ratio, small size and easy integration, and has advantages that other materials do not have. Compared with the prior art, the present scheme combines the advantages of micro-assembly and chip integration, and through the combination of the advantages of the two, the difficulty of the design process is reduced, and it is easy to implement, which is conducive to promoting engineering applications.

[0069] As needed, the above technical solutions can be combined to achieve the best technical effect.

[0070] The above are only the principles and preferred embodiments of the present application. It should be noted that, for ordinary technicians in this field, on the basis of the principles of the present application, several other modifications can be made, which should also be considered as the protection scope of the present application.

Claims

1. A low crosstalk optoelectronic co-sealed three-axis integrated transceiver module, characterized in that: include: A light source assembly, emitting a light signal; A first beam splitter prism, a second beam splitter prism and a third beam splitter prism are arranged in sequence along the transmission direction of the optical signal; The fourth beam splitter prism, the fifth beam splitter prism and the sixth beam splitter prism are respectively and correspondingly arranged on the reflected light transmission path of the first beam splitter prism, the reflected light transmission path of the second beam splitter prism and the reflected light transmission path of the third beam splitter prism; A lithium niobate thin film waveguide chip, comprising a first lithium niobate thin film waveguide, a second lithium niobate thin film waveguide and a third lithium niobate thin film waveguide, wherein the first lithium niobate thin film waveguide is arranged on the transmission path of the transmitted light of the fourth beam splitter prism, the second lithium niobate thin film waveguide is arranged on the transmission path of the transmitted light of the fifth beam splitter prism, and the third lithium niobate thin film waveguide is arranged on the transmission path of the transmitted light of the sixth beam splitter prism; the lithium niobate thin film waveguide chip is connected to a sensing optical fiber ring through a polarization-maintaining optical fiber, and the sensing optical fiber ring outputs a measured optical signal carrying measured current information to the lithium niobate thin film waveguide chip; the measured optical signal is transmitted to the fourth beam splitter prism, the fifth beam splitter prism and the sixth beam splitter prism via the first lithium niobate thin film waveguide, the second lithium niobate thin film waveguide and the third lithium niobate thin film waveguide; The first detector, the second detector and the third detector are respectively and correspondingly arranged on the reflected light transmission path of the fourth beam splitter prism, the reflected light transmission path of the fifth beam splitter prism and the reflected light transmission path of the sixth beam splitter prism, and detect the optical signal to be measured including the measured optical signal reflected by the fourth beam splitter prism, the fifth beam splitter prism and the sixth beam splitter prism, and convert the optical signal to be measured into an electrical signal to be measured; The processing circuit receives the electrical signals to be measured output by the first detector, the second detector and the third detector, and parses out the measured current.

2. The low crosstalk optoelectronic co-sealed three-axis integrated transceiver module according to claim 1, characterized in that: The light source assembly comprises: A laser chip for emitting laser signals; A collimating lens, arranged in the transmission direction of the laser signal, to focus the laser signal to obtain the optical signal; The laser isolation baffle is provided with a circular hole corresponding to the central axis of the collimating lens, and the optical signal is transmitted through the circular hole.

3. The low crosstalk optoelectronic co-sealed three-axis integrated transceiver module according to claim 2, characterized in that: The module also includes a temperature regulator: The light source assembly, the first detector, the second detector, the third detector and the processing circuit are all arranged on the temperature regulator; The light source assembly further comprises a thermal sensor, which detects the temperature value of the laser chip and sends the temperature value to the control module of the temperature regulator; The control module controls the temperature regulator to keep the temperature value within a set range.

4. The low crosstalk optoelectronic co-sealed three-axis integrated transceiver module according to claim 1, characterized in that: The transmittance:reflectivity of the first beam splitter prism is 2:1; The transmittance:reflectivity of the second beam splitter prism, the fourth beam splitter prism, the fifth beam splitter prism and the sixth beam splitter prism=1:1; The third beam splitter prism is a total reflection prism.

5. The low crosstalk optoelectronic co-sealed three-axis integrated transceiver module according to claim 1, characterized in that: Also includes: A first focusing lens is disposed between the fourth beam splitter prism and the first detector; A second focusing lens is disposed between the fifth beam splitter prism and the second detector; A third focusing lens is disposed between the sixth beam splitter prism and the third detector; a fourth focusing lens, disposed between the fourth beam splitter prism and the first lithium niobate thin film waveguide; a fifth focusing lens, disposed between the fifth beam splitter prism and the second lithium niobate thin film waveguide; The sixth focusing lens is disposed between the sixth beam splitter prism and the third lithium niobate thin film waveguide.

6. The low crosstalk optoelectronic co-sealed three-axis integrated transceiver module according to claim 5, characterized in that: The input ends of the first lithium niobate thin film waveguide, the second lithium niobate thin film waveguide and the third lithium niobate thin film waveguide are all provided with a curved section, and the curved section includes two cascaded semicircular sections, and the opening directions of the two semicircular sections are opposite.

7. The low crosstalk optoelectronic co-sealed three-axis integrated transceiver module according to claim 6, characterized in that: The waveguide width of the curved section is 0.8-1.2 μm; the diameter of the semicircular section is 150-400 μm.

8. The low crosstalk optoelectronic co-sealed three-axis integrated transceiver module according to claim 7, characterized in that: The output ends of the first lithium niobate thin film waveguide, the second lithium niobate thin film waveguide and the third lithium niobate thin film waveguide are provided with axis-fixing blocks, and the polarization-maintaining optical fiber is arranged in the axis-fixing block.

9. The low crosstalk optoelectronic co-sealed three-axis integrated transceiver module according to claim 5, characterized in that: Also includes: The detector isolation baffle is formed with a lens isolation enclosure for isolating the first focusing lens, the second focusing lens and the third focusing lens, and a detector isolation enclosure for isolating the first detector, the second detector and the third detector, and the lens isolation enclosure is formed with a pair of through holes suitable for light beams to pass through.

10. A fiber optic gyroscope, characterized in that: It comprises the low crosstalk optoelectronic co-sealed three-axis integrated transceiver module as described in any one of claims 1 to 9.

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