Time division multiplexing integrated fiber-optic gyroscope and optical signal measuring device

Abstract

The invention provides a time division multiplexing integrated fiber-optic gyroscope and an optical signal measuring device. The time division multiplexing integrated fiber-optic gyroscope comprises a light source, a photoelectric detector, a beam splitter, a light splitting modulation module, a first optical switch, a second optical switch, n sensitive rings and a first substrate, the light splitting modulation module, the first optical switch and the second optical switch are formed on the first substrate; the first branch end of the beam splitter is connected with the light source, the second branch end is connected with the photoelectric detector, and the common end is connected with the common end of the light splitting modulation module; a first branch end of the light splitting modulation module is connected with the first optical switch, and a second branch end is connected with the second optical switch; the n branch ends of the first optical switch are connected with the first ends of the n sensitive rings in a one-to-one correspondence mode, and the n branch ends of the second optical switch are connected with the second ends of the n sensitive rings in a one-to-one correspondence mode. Therefore, a receiving and transmitting optical path structure between the light source and the optical switch is reduced from a multi-axis mode to a single-axis mode, multi-axis angular velocity measurement is achieved through time division multiplexing, and signal crosstalk among multiple axes is avoided.

Description

Technical Field

[0001] This invention relates to the field of optical communication, and in particular to a time-division multiplexed integrated fiber optic gyroscope and an optical signal measurement device. Background Technology

[0002] A fiber optic gyroscope (FOG) is a precision sensor that uses the Sagnac effect to accurately measure the angular velocity or rotation angle of an object. As a core component of inertial navigation systems, it plays a crucial role in modern aviation, aerospace, navigation, defense, and many civilian fields.

[0003] A typical fiber optic gyroscope system comprises the following core components: a light source to provide stable light with low coherence; a sensing ring, typically made of an optical waveguide, used to create an optical path difference; a coupler and phase modulator for splitting, combining, and modulating the optical signal; and a photodetector to convert the optical signal carrying rotational information into an electrical signal and calculate the final angular velocity. However, existing fiber optic gyroscopes, when combined into a single three-axis system, suffer from severe inter-axis optoelectronic crosstalk, difficulty in integration, and challenges in direct time-division multiplexing.

[0004] Therefore, how to provide a time-division multiplexed integrated fiber optic gyroscope and optical signal measurement device to improve the integration of fiber optic gyroscopes, the convenience of time-division multiplexing, and avoid inter-axis optoelectronic crosstalk has become one of the technical problems that urgently need to be solved by those skilled in the art.

[0005] It should be noted that the above description of the technical background is only for the purpose of providing a clear and complete explanation of the technical solutions of the present invention and facilitating understanding by those skilled in the art. It should not be assumed that the above technical solutions are known to those skilled in the art simply because they have been described in the background section of this invention. Summary of the Invention

[0006] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a time-division multiplexed integrated fiber optic gyroscope and optical signal measurement device to solve the problems of severe inter-axis crosstalk, low integration, complex fabrication, and difficulty in direct time-division multiplexing in the existing fiber optic gyroscope.

[0007] To achieve the above and other related objectives, the present invention provides a time-division multiplexed integrated fiber optic gyroscope, comprising at least: a light source, a photodetector, a beam splitter, a beam splitting modulation module, a first optical switch, a second optical switch, n sensing rings, and a first substrate; wherein n is a natural number greater than or equal to 2; the beam splitting modulation module, the first optical switch, and the second optical switch are all formed on the first substrate; the first branch end of the beam splitter is connected to the light source, the second branch end is connected to the photodetector, and the common end is connected to the common end of the beam splitting modulation module; the first branch end of the beam splitting modulation module is connected to the common end of the first optical switch, and the second branch end is connected to the common end of the second optical switch; the n branch ends of the first optical switch are connected one-to-one to the first ends of the n sensing rings, and the n branch ends of the second optical switch are connected one-to-one to the second ends of the n sensing rings; wherein, the branch ends of the first optical switch and the second optical switch when selecting one are connected to the same sensing ring.

[0008] Optionally, the beam splitting modulation module includes a polarizer and a Y-waveguide; a first end of the polarizer is connected to the common end of the beam splitter, and a second end is connected to the common end of the Y-waveguide; a first branch end of the Y-waveguide is connected to the common end of the first optical switch, and a second branch end is connected to the common end of the second optical switch.

[0009] Optionally, n sensitive rings are formed on the first substrate.

[0010] Optionally, the time-division multiplexed integrated fiber optic gyroscope further includes n fourth couplers and n fifth couplers; n sensing rings are disposed outside the first substrate; the n fourth couplers are connected one-to-one between the n branch ends of the first optical switch and the first ends of the n sensing rings; the n fifth couplers are connected one-to-one between the n branch ends of the second optical switch and the second ends of the n sensing rings.

[0011] Alternatively, the time-division multiplexed integrated fiber optic gyroscope further includes a second substrate; n sensing rings are formed on the second substrate.

[0012] Alternatively, both the fourth coupler and the fifth coupler may be optical fibers; or both the fourth coupler and the fifth coupler may be end-face couplers.

[0013] Optionally, the beam splitter is formed on the first substrate, and the light source is formed on the first substrate.

[0014] Optionally, the time-division multiplexed integrated fiber optic gyroscope further includes a first coupler; the beam splitter is formed on the first substrate, and the light source is disposed outside the first substrate; the first coupler is connected between the first branch end of the beam splitter and the light source.

[0015] Optionally, the beam splitter is formed on the first substrate, and the photodetector is formed on the first substrate.

[0016] Optionally, the time-division multiplexed integrated fiber optic gyroscope further includes a second coupler; the beam splitter is formed on the first substrate, and the photodetector is disposed outside the first substrate; the second coupler is connected between the second branch end of the beam splitter and the photodetector.

[0017] Optionally, the time-division multiplexed integrated fiber optic gyroscope further includes a third coupler; the beam splitter, the photodetector, and the light source are all disposed outside the first substrate; the third coupler is connected between the common terminal of the beam splitter and the common terminal of the beam splitting modulation module.

[0018] To achieve the above and other related objectives, the present invention also provides an optical signal measurement device, which includes at least: a control circuit and the time-division multiplexed integrated fiber optic gyroscope; the control circuit is connected to the control terminal of the first optical switch and the control terminal of the second optical switch, and is used to control the first optical switch and the second optical switch.

[0019] As described above, the time-division multiplexed integrated fiber optic gyroscope and optical signal measurement device of the present invention have the following beneficial effects:

[0020] 1. By forming the polarizer, Y-waveguide, first optical switch and second optical switch on the first substrate, this invention avoids the transmission of highly polarized light in space, thus avoiding polarization-maintaining fusion splicing and greatly reducing the fabrication difficulty of fiber optic gyroscopes.

[0021] 2. This invention places a Y-waveguide between the polarizer and two optical switches, and connects the two ends of n sensitive rings one-to-one between the n branches of the first optical switch and the n branches of the second optical switch. Before the optical switches implement time-division multiplexing, a pair of optical signals for generating optical path difference is generated. The first and second detection optical signals are transmitted in opposite directions in different sensitive rings through the optical switches in a time-division manner. This allows the multi-axis detection optical signals to share a single Y-waveguide in a time-division manner, which simplifies the optical path of the fiber optic gyroscope, improves the integration of the fiber optic gyroscope, and avoids inter-axis crosstalk of the fiber optic gyroscope. Attached Figure Description

[0022] Figure 1 The diagram shown is a structural schematic of a discrete fiber optic gyroscope.

[0023] Figure 2 The diagram shown is a structural schematic of an integrated three-axis fiber optic gyroscope.

[0024] Figure 3The diagram shown is a first structural schematic of the time-division multiplexed integrated fiber optic gyroscope of the present invention.

[0025] Figure 4 The diagram shows the modulation signal loaded on the Y-waveguide according to the present invention.

[0026] Figure 5 The diagram shows the gating of the time-division multiplexed integrated fiber optic gyroscope of the present invention on the X-axis.

[0027] Figure 6 This diagram illustrates the modulation signal allocated to the light path when the X-axis is selected according to the present invention.

[0028] Figure 7 The diagram shows the gating of the time-division multiplexed integrated fiber optic gyroscope of the present invention on the Y-axis.

[0029] Figure 8 This diagram illustrates the modulation signal allocated to the light path when the Y-axis is selected according to the present invention.

[0030] Figure 9 The diagram shows the gating of the time-division multiplexed integrated fiber optic gyroscope of the present invention on the Z-axis.

[0031] Figure 10 This diagram illustrates the modulation signal allocated to the light path when the Z-axis is selected according to the present invention.

[0032] Figure 11 The diagram shown illustrates a second structural design of the time-division multiplexed integrated fiber optic gyroscope of the present invention.

[0033] Figure 12 The diagram shown is a third structural schematic of the time-division multiplexed integrated fiber optic gyroscope of the present invention.

[0034] Figure 13 The diagram shown is a structural schematic of the optical signal measuring device of the present invention.

[0035] Component designation explanation

[0036] 1-time-division multiplexed integrated fiber optic gyroscope

[0037] 1a light source

[0038] 1b photodetector

[0039] 1c beam splitter

[0040] 1D spectral modulation module

[0041] 11 polarizer

[0042] 12Y waveguide

[0043] 1e First Optical Switch

[0044] 1f Second Optical Switch

[0045] 1g sensitive ring

[0046] 1h First substrate

[0047] 1i fourth coupler

[0048] 1j Fifth Coupler

[0049] 1k second substrate

[0050] 2 Control Circuit Detailed Implementation

[0051] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0052] Please see Figures 1-13 It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0053] like Figure 1 As shown, discrete fiber optic gyroscopes are a common type, consisting of multiple independent optical components connected by optical fibers, including a light source, coupler, phase modulator, sensing ring, and photodetector. To adapt to the trend of miniaturization and integration of optical paths, the discrete components in fiber optic gyroscopes can be miniaturized for integration. Integration methods include combining the light source, photodetector, and coupler into a single unit, or combining the light source, photodetector, coupler, and phase modulator into a single unit. However, even after miniaturization, the coupler, phase modulator, and sensing ring remain polarization-maintaining devices placed in space for transmitting highly polarized light. The difficulty of splicing these miniaturized polarization-maintaining devices with fibers increases dramatically, especially in multi-axis fiber optic gyroscopes where the number of discrete components increases significantly. This not only presents the problem of polarization-maintaining splicing but also the challenge of integrating the fiber optic gyroscope itself.

[0054] like Figure 2As shown, in order to obtain the three-dimensional information of the angular velocity of the optical signal, there is an integrated three-axis fiber optic gyroscope used to obtain the angular velocities of the optical signal on the X-axis, Y-axis and Z-axis respectively. However, there is obvious crosstalk between the three axes, which leads to a large error in the measurement results.

[0055] Therefore, in order to solve the above problems, this invention proposes a time-division multiplexed integrated fiber optic gyroscope and optical signal measurement device, the specific technical solution of which is as follows:

[0056] Example 1

[0057] like Figure 3 As shown, this embodiment provides a time-division multiplexed integrated fiber optic gyroscope 1, including: a light source 1a, a photodetector 1b, a beam splitter 1c, a beam splitting modulation module 1d, a first optical switch 1e, a second optical switch 1f, n sensitive rings 1g, and a first substrate 1h; wherein n is a natural number greater than or equal to 2.

[0058] like Figure 3 As shown, the beam splitting modulation module 1d, the first optical switch 1e, and the second optical switch 1f are all formed on the first substrate 1h.

[0059] Specifically, in this embodiment, the beam splitting modulation module 1d, the first optical switch 1e, and the second optical switch 1f are all formed on the first substrate 1h, which can improve the integration density of the fiber optic gyroscope. Furthermore, when the beam splitting modulation module 1d, the first optical switch 1e, and the second optical switch 1f are formed on the chip, they can avoid being positioned in space to transmit highly polarized light, thus avoiding fiber splicing of polarization-maintaining devices and reducing the fabrication difficulty of the fiber optic gyroscope.

[0060] like Figure 3 As shown, the first branch of the beam splitter 1c is connected to the light source 1a, the second branch is connected to the photodetector 1b, and the common end is connected to the common end of the beam splitting modulation module 1d.

[0061] Specifically, in this embodiment, when the optical signal is transmitted from the light source 1a to the sensitive ring 1g, the light source 1a generates the input optical signal, which then enters the beam splitting modulation module 1d via the beam splitter 1c. When the optical signal is transmitted from the sensitive ring 1g to the photodetector 1b, the photodetector 1b receives the modulated optical signal output by the beam splitter 1c, which in turn receives the modulated optical signal output by the beam splitting modulation module 1d. As an example, the light source 1a can be a superluminescent diode (SLD) or an amplified spontaneous emission (ASE) light source, and the beam splitter 1c can be a 3dB (decibel) beam splitter with high light transmittance and ease of design and fabrication. In practical applications, the specific types of the light source 1a and beam splitter 1c can be set as needed, and are not limited to this embodiment.

[0062] Specifically, in this embodiment, both the beam splitter 1c and the light source 1a can be formed on the first substrate 1h to further improve the integration of the fiber optic gyroscope. Furthermore, by forming the beam splitter 1c on the first substrate 1h and placing the light source 1a outside the first substrate 1h, the fabrication difficulty of the fiber optic gyroscope is reduced. In this case, the fiber optic gyroscope also includes a first coupler connected between the first branch end of the beam splitter 1c and the light source 1a. Furthermore, both the beam splitter 1c and the photodetector 1b can be formed on the first substrate 1h to further improve the integration of the fiber optic gyroscope. Furthermore, by forming the beam splitter 1c on the first substrate 1h and placing the photodetector 1b outside the first substrate 1h, the fiber optic gyroscope also includes a second coupler connected between the second input end of the beam splitter 1c and the photodetector 1b. Furthermore, the beam splitter 1c, photodetector 1b, and light source 1a are all located outside the first substrate 1h. In this case, the fiber optic gyroscope also includes a third coupler, which is connected between the common end of the beam splitter 1c and the common end of the beam splitting modulation module 1d.

[0063] like Figure 3 As shown, the first branch of the beam splitting and modulation module 1d is connected to the common terminal of the first optical switch 1e, and the second branch is connected to the common terminal of the second optical switch 1f.

[0064] Specifically, in this embodiment, when the optical signal is transmitted from the light source 1a to the sensing ring 1g, the beam splitting modulation module 1d receives the input optical signal output by the beam splitter 1c, polarizes the input optical signal, and then splits the input optical signal into a first optical signal and a second optical signal. The first optical signal and the second optical signal are output to the first optical switch 1e and the second optical switch 1f, respectively. Further, when the optical signal is transmitted from the sensing ring 1g to the photodetector 1b, the beam splitting modulation module 1d receives the second detection optical signal output by the first optical switch 1e and the first detection optical signal output by the second optical switch 1f, respectively, and modulates them into a modulated optical signal for output.

[0065] Specifically, in this embodiment, the beam splitting modulation module 1d includes a polarizer 11 and a Y-waveguide 12; wherein, the first end of the polarizer 11 is connected to the common end of the beam splitter 1c, the second end is connected to the common end of the Y-waveguide 12, the first branch end of the Y-waveguide 12 is connected to the common end of the first optical switch 1e, and the second branch end is connected to the common end of the second optical switch 1f. Further, when the optical signal is transmitted from the light source 1a to the sensitive ring 1g, the polarizer 11 receives and polarizes the input optical signal output by the beam splitter 1c, and outputs it to the Y-waveguide 12. The Y-waveguide 12 splits the input optical signal into a first optical signal and a second optical signal. The first optical signal is output to the first optical switch 1e through the first branch end, and the second optical signal is output to the second optical switch 1f through the second branch end. Furthermore, when the optical signal is transmitted from the sensitive ring 1g to the photodetector 1b, the Y-waveguide 12 receives the second probe optical signal output from the first optical switch 1e and the first probe optical signal output from the second optical switch 1f, respectively, and modulates it into a modulated optical signal, which is then output to the polarizer 11. The polarizer 11 transmits the modulated optical signal to the beam splitter 1c. As an example, to maintain the high performance of the Y-waveguide 12, the Y-waveguide 12 can be made of any material capable of enabling the device to achieve beam splitting and modulation functions, such as lithium niobate, silicon, lithium tantalate, polymers, phase change materials, and piezoelectric materials. In practical applications, the specific material of the Y-waveguide 12 is set as needed, and is not limited to this embodiment.

[0066] like Figure 3 As shown, the n branches of the first optical switch 1e are connected one-to-one to the first ends of the n sensitive rings 1g, and the n branches of the second optical switch 1f are connected one-to-one to the second ends of the n sensitive rings 1g; wherein, the branch of the first optical switch 1e when one is selected and the branch of the second optical switch 1f when one is selected are connected to the same sensitive ring 1g.

[0067] Specifically, in this embodiment, the first optical switch 1e receives the first optical signal from the first branch end of the beam splitting modulation module, selects one of its n branches, and outputs a first probe optical signal, which is received by the first end of the corresponding sensitive ring 1g. Further, the second optical switch 1f receives the second optical signal from the second branch end of the beam splitting modulation module, selects one of its n branches, and outputs a second probe optical signal, which is received by the second end of the corresponding sensitive ring 1g. Even further, the first probe optical signal passes through the sensitive ring 1g and enters the second optical switch 1f from the second end of the sensitive ring 1g, and is transmitted from the second optical switch 1f to the second branch end of the beam splitting modulation module 1d. The second probe optical signal passes through the sensitive ring 1g and enters the first optical switch 1e from the first end of the sensitive ring 1g, and is transmitted from the first optical switch 1e to the first branch end of the beam splitting modulation module 1d. Furthermore, since the branch ends of the first optical switch 1e and the second optical switch 1f are connected to the same sensitive ring 1g, the first and second probe optical signals are transmitted in opposite directions within the same sensitive ring 1g. Based on the angular velocity of the sensitive ring 1g, a specific optical path difference is generated. By modulating the first and second probe optical signals into modulated optical signals and transmitting them to the photodetector 1b, the angular velocity of the optical signal within the corresponding sensitive ring 1g can be obtained. As an example, both the first optical switch 1e and the second optical switch 1f can be in the form of a 22MMI (Multi-Mode Interference) circuit with a phase shifter, which has the advantages of high extinction ratio, low loss, and a wide response time range. In practical applications, the specific types of the first optical switch 1e and the second optical switch 1f can be set according to needs, and are not limited to this embodiment.

[0068] Specifically, in this embodiment, when the first optical switch 1e and the second optical switch 1f are time-division multiplexed, this embodiment can achieve time-division multiplexing quickly and efficiently to avoid signal crosstalk between multiple axes. As an example, n is set to 3, and... Figure 4 The continuous time period in the selection is time-division. Figure 6 , Figure 8 and Figure 10 ,like Figure 4 , Figure 5 and Figure 6 As shown, by selecting the first branch of the first optical switch 1e and the first branch of the second optical switch 1f, the angular velocity of the optical signal on the X-axis can be obtained; as... Figure 4 , Figure 7 and Figure 8 As shown, by selecting the second branch of the first optical switch 1e and the second branch of the second optical switch 1f, the angular velocity of the optical signal on the Y-axis can be obtained; as... Figure 4 , Figure 9 and Figure 10As shown, by selecting the third branch of the first optical switch 1e and the third branch of the second optical switch 1f, the angular velocity of the optical signal on the Z-axis can be obtained. Through triaxial time-division multiplexing, this example can obtain the complete angular velocity and avoid optical crosstalk. In practical applications, the value of n and the specific selection methods of the first optical switch 1e and the second optical switch 1f can be set as needed, and are not limited to this embodiment.

[0069] Specifically, in this embodiment, n sensitive rings 1g can be formed on the first substrate 1h to improve the integration density of the fiber optic gyroscope. Further, the n sensitive rings 1g can also be disposed outside the first substrate 1h to reduce the manufacturing complexity of the fiber optic gyroscope. In this case, the fiber optic gyroscope also includes n fourth couplers 1i and n fifth couplers 1j; the n fourth couplers 1i are connected one-to-one between the n branch ends of the first optical switch 1e and the first ends of the n sensitive rings 1g, and the n fifth couplers 1j are connected one-to-one between the n branch ends of the second optical switch 1f and the second ends of the n sensitive rings 1g; wherein, to make the layout of the fiber optic gyroscope neater, the n fourth couplers 1i and n fifth couplers 1j can be arranged in parallel. Furthermore, the n sensitive rings 1g can be directly disposed in space, that is, the n sensitive rings are not formed on any substrate, and the fourth couplers 1i and fifth couplers 1j can be in the form of optical fibers. Furthermore, as... Figure 11 and Figure 12 As shown, the fiber optic gyroscope also includes a second substrate 1k, on which n sensing rings 1g are formed, to balance the manufacturing difficulty and integration density of the fiber optic gyroscope. As an example, such as... Figure 11 As shown, both the fourth coupler 1i and the fifth coupler 1j are in the form of optical fibers. The optical switch on the first substrate 1h and the sensitive ring on the second substrate 1k are connected based on the fourth coupler 1i and the fifth coupler 1j. As another example, such as Figure 12 As shown, the fourth coupler 1i is an end-face coupler fabricated on the side of the first substrate 1h. Figure 11 (Not shown in the image), the fifth coupler 1j is an end-face coupler fabricated on the side of the second substrate 1k ( Figure 11 (Not shown in the diagram) An end-to-end connection is achieved between the optical switch on the first substrate 1h and the sensitive ring on the second substrate 1k based on a fourth coupler 1i and a fifth coupler 1j arranged relative to each other. In practical applications, the specific structure of the fourth coupler 1i and the fifth coupler 1j can be configured as needed, and is not limited to this embodiment.

[0070] It should be noted that when used in space to transmit highly polarized light, the beam splitter 1c, Y-waveguide 12, first optical switch 1e, and second optical switch 1f all need to be polarization-maintaining devices. In this embodiment, by forming the Y-waveguide 12, first optical switch 1e, and second optical switch 1f on a chip, polarization-maintaining fusion of the above devices is avoided. Furthermore, by placing the Y-waveguide 12 between the polarizer 11 and the two optical switches, and connecting the n sensitive rings 1g one-to-one between the n branches of the first optical switch 1e and the n branches of the second optical switch 1f, this embodiment first obtains a pair of optical signals for generating optical path difference (generating only one optical path difference in one sensitive ring within a single time period), and then uses the two optical switches to transmit the first and second probe optical signals in opposite directions in different sensitive rings 1g in a time-division manner. Therefore, this embodiment realizes that multi-axis probe optical signals share a single Y-waveguide 12 in a time-division manner, which simplifies the optical path of the fiber optic gyroscope, improves the integration of the fiber optic gyroscope, and avoids inter-axis crosstalk of the fiber optic gyroscope.

[0071] Example 2

[0072] like Figure 12 As shown, this embodiment provides an optical signal measurement device, including: a control circuit 2 and a time-division multiplexed integrated fiber optic gyroscope 1.

[0073] Specifically, in this embodiment, the control circuit 2 is connected to the control terminal of the first optical switch 1e and the control terminal of the second optical switch 1f, and is used to control the first optical switch 1e and the second optical switch 1f to realize the automated measurement of the time-division multiplexed integrated fiber optic gyroscope 1.

[0074] It should be noted that the integrated fiber optic gyroscope 1 with time division multiplexing included in this embodiment may be the one in Embodiment 1, or it may be other integrated fiber optic gyroscope 1 with time division multiplexing that is the same as or similar to the concept of this invention.

[0075] In summary, the time-division multiplexing integrated fiber optic gyroscope and optical signal measurement device of the present invention includes: a light source, a photodetector, a beam splitter, a beam splitting modulation module, a first optical switch, a second optical switch, n sensitive rings, and a first substrate; the beam splitting modulation module, the first optical switch, and the second optical switch are formed on the first substrate; the first branch end of the beam splitter is connected to the light source, the second branch end is connected to the photodetector, and the common end is connected to the common end of the beam splitting modulation module; the first branch end of the beam splitting modulation module is connected to the first optical switch, and the second branch end is connected to the second optical switch; the n branches of the first optical switch are connected one-to-one to the first ends of the n sensitive rings, and the n branches of the second optical switch are connected one-to-one to the second ends of the n sensitive rings. Therefore, by placing the beam splitting modulation module between the beam splitter and the two optical switches, and... Figure 2In comparison, this invention reduces the optical path structure between the light source and the optical switch from multi-axis to single-axis, and achieves multi-axis angular velocity measurement through time-division multiplexing. It offers advantages such as simple signal processing, compact transceiver structure, consistent optical path, high production efficiency, and low cost. Therefore, this invention effectively overcomes the various shortcomings of existing technologies and has high industrial applicability.

[0076] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A time-division multiplexed integrated fiber optic gyroscope, characterized in that, The time-division multiplexed integrated fiber optic gyroscope includes at least: a light source, a photodetector, a beam splitter, a beam splitting modulation module, a first optical switch, a second optical switch, n sensing rings, and a first substrate; where n is a natural number greater than or equal to 2. The beam splitting modulation module, the first optical switch, and the second optical switch are all formed on the first substrate; The first branch of the beam splitter is connected to the light source, the second branch is connected to the photodetector, and the common end is connected to the common end of the beam splitting modulation module. The first branch of the beam splitting modulation module is connected to the common terminal of the first optical switch, and the second branch is connected to the common terminal of the second optical switch. The n branches of the first optical switch are connected one-to-one to the first ends of the n sensitive rings, and the n branches of the second optical switch are connected one-to-one to the second ends of the n sensitive rings. The branch ends of the first optical switch and the second optical switch are connected to the same sensitive ring when they are selected.

2. The time-division multiplexed integrated fiber optic gyroscope according to claim 1, characterized in that: The beam-splitting modulation module includes a polarizer and a Y-waveguide; The first end of the polarizer is connected to the common end of the beam splitter, and the second end is connected to the common end of the Y-waveguide; the first branch end of the Y-waveguide is connected to the common end of the first optical switch, and the second branch end is connected to the common end of the second optical switch.

3. The time-division multiplexed integrated fiber optic gyroscope according to claim 1, characterized in that: n sensitive rings are formed on the first substrate.

4. The time-division multiplexed integrated fiber optic gyroscope according to claim 1, characterized in that: The time-division multiplexed integrated fiber optic gyroscope also includes n fourth couplers and n fifth couplers; n sensing rings are disposed outside the first substrate; n fourth couplers are connected one-to-one between the n branch ends of the first optical switch and the first end of the n sensitive rings; n fifth couplers are connected one-to-one between the n branch ends of the second optical switch and the second ends of the n sensitive rings.

5. The time-division multiplexed integrated fiber optic gyroscope according to claim 4, characterized in that: The time-division multiplexed integrated fiber optic gyroscope also includes a second substrate; n sensitive rings are formed on the second substrate.

6. The time-division multiplexed integrated fiber optic gyroscope according to claim 5, characterized in that: Both the fourth coupler and the fifth coupler are optical fibers; or both the fourth coupler and the fifth coupler are end-face couplers.

7. The time-division multiplexed integrated fiber optic gyroscope according to any one of claims 1-6, characterized in that: The beam splitter is formed on the first substrate, and the light source is formed on the first substrate.

8. The time-division multiplexed integrated fiber optic gyroscope according to any one of claims 1-6, characterized in that: The time-division multiplexed integrated fiber optic gyroscope further includes a first coupler; the beam splitter is formed on the first substrate, and the light source is disposed outside the first substrate; The first coupler is connected between the first branch end of the beam splitter and the light source.

9. The time-division multiplexed integrated fiber optic gyroscope according to any one of claims 1-6, characterized in that: The beam splitter is formed on the first substrate, and the photodetector is formed on the first substrate.

10. The time-division multiplexed integrated fiber optic gyroscope according to any one of claims 1-6, characterized in that: The time-division multiplexed integrated fiber optic gyroscope further includes a second coupler; the beam splitter is formed on the first substrate, and the photodetector is disposed outside the first substrate; The second coupler is connected between the second branch end of the beam splitter and the photodetector.

11. The time-division multiplexed integrated fiber optic gyroscope according to any one of claims 1-6, characterized in that: The time-division multiplexed integrated fiber optic gyroscope also includes a third coupler; the beam splitter, the photodetector, and the light source are all disposed outside the first substrate; The third coupler is connected between the common terminal of the beam splitter and the common terminal of the beam splitting modulation module.

12. An optical signal measuring device, characterized in that, The optical signal measurement device includes at least: a control circuit and a time-division multiplexed integrated fiber optic gyroscope as described in any one of claims 1-11; The control circuit is connected to the control terminals of the first optical switch and the second optical switch, and is used to control the first optical switch and the second optical switch.

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