Multi-channel hollow optical fiber slip ring

Abstract

The utility model discloses a multi-channel hollow optical fiber slip ring, which comprises a stator end provided with a stator, a rotor end provided with a rotor and a combined Dove prism structure arranged in the rotor end, the rotor in the rotor end and the combined Dove prism structure coaxially rotate, and the rotor end is configured to rotate at a speed omega when the rotor rotates at the speed omega. The combined Dove prism structure rotates at a speed [omega] / 2. In the rotor, a first optical fiber channel is arranged on the outer side of an incident inclined plane close to the combined Dove prism structure, an incident optical fiber collimator is arranged in the first optical fiber channel, and two second optical fiber channels are arranged on the outer side of an emergent inclined plane close to the combined Dove prism structure in the stator and are arranged up and down. And receiving optical fiber collimators are arranged in the two second optical fiber channels. According to the utility model, a combined Dove prism structure is introduced, and the relative rotation position of the rotor and the incident end optical fiber collimator is considered, so that optical signals are continuously transmitted, and uninterrupted coupling between an input channel and an output channel of the optical signals is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of optical fiber communication equipment, in particular to a multi-channel hollow optical fiber slip ring. Background Art

[0002] The smooth ring is a device for transmitting optical fiber signals between rotating and stationary platforms. It is widely used in large optical fiber signal data transmission in airborne, shipborne, and spherical systems. The traditional smooth ring is coaxial, that is, the signal transmission path coincides with the central axis of the optical device. It is characterized by a simple optical path and a small size. However, because the central axis is occupied by other media or devices, such as vehicle-mounted laser emission channels, radar waveguides, and high-pressure gas transmissions, where optical signals cannot be transmitted along the optical axis that coincides with the central axis, in order to achieve integrated rotational transmission of light, electricity, liquid, and gas and solve the problem of mutual interference suppression, off-axis transmission of optical signals becomes necessary. Therefore, the hollow smooth ring came into being, with a structure such as Figure 1 As shown, it consists of a rotor end ring and a stator end, its medium channel is located on the central axis, and the optical signal transmission path is located at the paraxial position.

[0003] Traditional hollow smooth rings mainly include direct coupling type, light reflection and refraction type, waveguide type, motor drive type, etc. However, these hollow smooth ring structures generally have the following shortcomings:

[0004] (1) It is impossible to achieve uninterrupted continuous transmission of optical signals and cannot meet the normal communication requirements of the system;

[0005] (2) The loss is too large to meet the optical receiving sensitivity requirements of the system optical link.

[0006] For example, the direct coupling type uses a fiber collimator to directly align the input fiber and the output fiber, but this structure does not take into account the assembly accuracy and coupling difficulty, and there are problems such as discontinuous optical signal transmission, small light spot, and large coupling loss. The hollow smooth ring with an annular reflector with an output window is to place the light source in the inner cavity of the annular reflector, the receiver is placed near the output window, and the lens is used to converge the light beam emitted from the reflector. However, in this smooth ring structure, the light source is placed in the reflector cavity, which is not conducive to the structural design, and the middle channel is occupied, and the overall insertion loss is large. The hollow smooth ring with a plane-cone reflection structure adopts the dynamic input of the bypass rotating signal beam. The signal beams at different times are dynamically transmitted around the axis in the plane-cone reflection structure in the same law. When the exit window meets certain conditions, it can ensure that the signal beams at different times can be emitted from the exit window. This method realizes uninterrupted transmission, but the loss of the smooth ring of this structure usually reaches 10dB, and the parallelism of the light after steering and the rotation axis is very high, and the steering structure design is not realized. The hollow smooth ring of the annular optical waveguide with V-groove adopts the optical signal emitted from the input end to enter the annular waveguide after passing through the fiber collimator. After the optical signal is coupled into the annular waveguide, it is transmitted in the waveguide by the reflection of the V-groove, and finally coupled out of the waveguide and received by the receiver. This structure is difficult to process, and the single coupling loss is about 40dB. Utility Model Content

[0007] In order to solve the technical problems mentioned in the background technology, the utility model provides a multi-channel hollow optical fiber slip ring which can realize multi-medium uninterrupted low-loss.

[0008] The utility model adopts the following technical solution: a multi-channel hollow optical fiber slip ring, comprising:

[0009] Disposing a stator end of the stator;

[0010] Disposing a rotor end of the rotor;

[0011] The stator end and the rotor end are rotatably connected to each other;

[0012] Also included is a combined dove prism structure disposed in the rotor end;

[0013] The combined Dove prism structure is positioned between the stator and the rotor and is used to transmit optical signals;

[0014] The rotor at the rotor end rotates coaxially with the combined Dove prism structure, and the rotor end is configured so that when the rotor rotates at a speed ω, the combined Dove prism structure rotates at a speed ω / 2;

[0015] The combined Dove prism structure comprises:

[0016] A first prism, comprising a first incident inclined surface, a first reflecting surface, and a first exiting inclined surface;

[0017] A second prism, lying sideways inside the first prism, comprises a second incident inclined surface, a second reflecting surface, and a second exiting inclined surface;

[0018] The axial sections of the first and second prisms are isosceles trapezoidal;

[0019] The first prism has a first square opening vertically extending downward from the top, and the bottom surface of the first square opening extends to the first reflecting surface;

[0020] The second prism has a second square opening vertically downward from the center of the top, the bottom surface of the second square opening continues to the second reflecting surface, and the cross section of the second incident surface is concave;

[0021] The second prism is embedded in the first square opening hole with an overall deflection of 90 degrees, and the top and side walls of the open end of the second square opening hole are closely fitted with the inner wall of the first square opening hole;

[0022] and when lying on the side, the central axis of the second square open hole cavity coincides with the central axis of the first prism;

[0023] In the rotor, a first optical fiber channel is arranged outside the incident inclined surface close to the combined Dove prism structure;

[0024] An incident optical fiber collimator is arranged in the first optical fiber channel;

[0025] In the stator, two second optical fiber channels corresponding to the first optical fiber channels are arranged outside the exit inclined surface close to the combined Dove prism structure;

[0026] The two second optical fiber channels are arranged vertically, and receiving optical fiber collimators are arranged in the two second optical fiber channels.

[0027] Furthermore, cross sections of the first incident inclined surface, the second incident inclined surface, the first exit inclined surface, and the second exit inclined surface are all coated with an anti-reflection film layer.

[0028] Furthermore, the top and side walls of the open end of the second square open hole are connected to the inner wall of the first square open hole by gluing.

[0029] Compared with the prior art, the advantages of the utility model are:

[0030] The multi-channel hollow fiber slip ring designed by the utility model is that the optical signal passes through the optical fiber collimator at the input end and is incident on the combined Dove prism structure. After the optical signal is coupled into the prism, it is finally transferred to the output prism by the reflection of its bottom surface and received by the receiving collimator. When the input light rotates one circle relative to the combined Dove prism structure, the two receiving collimators will receive the optical signal at different angles respectively, and finally the optical switch will output the two optical signals alternately. The utility model introduces the combined Dove prism structure, taking into account the relative rotation position of the rotor and the optical fiber collimator at the incident end, so that the optical signal is transmitted uninterruptedly, and the uninterrupted coupling between the input channel and the output channel of the optical signal is realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the cross-sectional structure of the multi-channel hollow optical fiber slip ring of the utility model;

[0032] Figure 2 This is a schematic diagram of the optical path coupling of the Dove prism of the utility model;

[0033] Figure 3 It is a schematic diagram of the overall structure of the combined dove prism structure of the utility model;

[0034] Figure 4 It is a cross-sectional view of the incident oblique plane of the combined dove prism structure of the utility model.

[0035] in:

[0036] 1-stator, 2-rotor, 3-combined Dove prism structure, 4-incident fiber collimator, 5-receiving fiber collimator,

[0037] 11-second optical fiber channel, 21-first optical fiber channel,

[0038] 31-First prism, 32-Second prism,

[0039] 31_1 - first incident inclined surface, 31_2 - first reflecting surface, 31_3 - first exiting inclined surface, 31_4 - first square open hole;

[0040] 32_1 - second incident inclined surface, 32_2 - second reflecting surface, 32_3 - second exiting inclined surface, 32_4 - second square open hole. DETAILED DESCRIPTION

[0041] In order to facilitate those skilled in the art to understand the technical solution of the utility model, further description is now made with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the utility model.

[0042] In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present invention. However, it is apparent that one or more embodiments may be implemented without these specific details. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present invention.

[0043] Please refer to Figure 1 , is a schematic diagram of the cross-sectional structure of the multi-channel hollow optical fiber slip ring of the utility model, including a stator end provided with a stator 1, a rotor end provided with a rotor 2, and the stator end and the rotor end are rotatably connected to each other. The utility model also includes a combined Dove prism structure 3 provided in the rotor end, and the combined Dove prism structure 3 is positioned between the stator 1 and the rotor 2 for transmitting optical signals. The rotor 2 rotates coaxially with the combined Dove prism structure 3 in the rotor end, and the rotor end is configured such that when the rotor 2 rotates at a speed ω, the combined Dove prism structure 3 rotates at a speed ω / 2. In the rotor 2, a first optical fiber channel 21 is provided near the outer side of the incident inclined surface of the combined Dove prism structure 3. An incident optical fiber collimator 4 is provided in the first optical fiber channel 21. In the stator 1, two second optical fiber channels 11 corresponding to the first optical fiber channel 21 are provided near the outer side of the exit inclined surface of the combined Dove prism structure 3, and the two second optical fiber channels 11 are arranged up and down, and a receiving optical fiber collimator 5 is provided in the two second optical fiber channels 11.

[0044] like Figure 3As shown, in this embodiment, the combined dove prism structure 3 includes a first dove prism 31, including a first incident inclined surface 31_1, a first reflecting surface 31_2, and a first exiting inclined surface 31_3. The second dove prism 32, lying on its side in the first dove prism 31, includes a second incident inclined surface 32_1, a second reflecting surface 32_2, and a second exiting inclined surface 32_3. In specific implementation, the cross sections of the first incident inclined surface 31_1, the second incident inclined surface 32_1, and the first exiting inclined surface 31_3, and the second exiting inclined surface 32_3 are all coated with an anti-reflection film layer to reduce or eliminate the reflected light on the incident surface and the exiting surface of the prism, thereby increasing the light transmittance of the dove prism. The axial sections of the first dove prism 31 and the second dove prism 32 are isosceles trapezoidal, and the first dove prism 31 is vertically downwardly provided with a first square open hole 31_4, and the bottom surface of the first square open hole 31_4 continues to the first reflecting surface 31_2. The second prism 32 has a second square open hole 32_4 vertically downward from the center of the top, and the bottom surface of the second square open hole 32_4 continues to the second reflection surface 32_2, so that the cross section of the second incident inclined surface 32_1 is concave. The second prism 32 is embedded in the first square open hole 31_4 with an overall deflection of 90°. The top and side walls of the open end of the second square open hole 32_4 are tightly fitted with the inner wall of the first square open hole 31_4, and when lying on its side, the central axis of the cavity of the second square open hole 32_4 coincides with the central axis of the first prism 31. In specific implementation, the top and side walls of the open end of the second square open hole 32_4 are connected to the inner wall of the first square open hole 31_4 by gluing.

[0045] Combination Figure 1-3 As shown, after the incident optical signal passes through the incident optical fiber collimator, it is incident into the combined Dove prism structure. After the optical signal is coupled into the combined Dove prism structure, part of the incident light is reflected by the first reflection surface 31_2 on the bottom of the first Dove prism 31 and finally transferred to the output prism by the first output inclined surface 31_3 and received by the receiving optical fiber collimator 5. Part of the incident light is reflected by the second reflection surface 32_2 on the bottom of the second Dove prism 32 and finally transferred to the output prism by the second output inclined surface 32_3 and received by the receiving optical fiber collimator 5. When the input light rotates one circle relative to the combined Dove prism structure, the two receiving optical fiber collimators 5 will receive the optical signal at different angles respectively, and finally the optical switch will output the two optical signals alternately. Assuming a four-channel hollow smooth ring, the four optical signals output by the incident collimator will lose about 2dB after passing through the combined Dove prism structure, and the optical switch will lose about 1dB, so the loss of the entire optical path is 3dB, which is much smaller than the loss of the traditional smooth ring structure.

[0046] This structure takes into account the relative rotation position of the rotor and the incident end optical fiber collimator by introducing a combined dove prism structure 3, so that the optical signal is transmitted uninterruptedly. The characteristic of the dove prism is that when the incident end collimator rotates at an angular velocity of ω, the dove prism must rotate at an angle of ω / 2 to ensure that the position of the output light remains unchanged, thereby realizing uninterrupted coupling between the input channel and the output channel of the optical signal.

[0047] like Figure 4 As shown, it is a cross-sectional view of the incident inclined plane of the combined dove prism structure of the utility model, and the solid circle is a circular ring formed by the incident path of the incident light on the combined dove prism structure when the rotor ring drives the input end collimator and the combined dove prism structure to rotate. As shown in the figure, when arranging the input end collimator, it is necessary to make the incident light completely incident on the side surface of the prism during the rotation process, that is, the incident light is required to fall in the shaded part of the circular ring bounded by the second square open hole 32_4 and the side surface of the second dove prism.

[0048] In summary, in the multi-channel hollow fiber slip ring designed by the utility model, the optical signal passes through the input end optical fiber collimator and is incident into the combined Dove prism structure. After the optical signal is coupled into the prism, it is finally transferred to the output prism by the reflection of its bottom surface and received by the receiving collimator. When the input light rotates one circle relative to the combined Dove prism structure, the two receiving collimators will receive the optical signal at different angles respectively, and finally the two optical signals are output alternately by the optical switch. When the utility model introduces the combined Dove prism structure, when the input light rotates one circle relative to the combined Dove prism structure, the optical signal of the input end collimator is incident on the reflection surface of the prism in the combined Dove prism structure, and the final transmission path of the light is parallel to the central axis of the prism, and does not pass through the central square hole. Therefore, the central hole of the hollow smooth ring does not affect the transmission of the optical signal regardless of whether it transmits light, electricity, liquid, gas or other media. The relative rotation position of the rotor and the optical fiber collimator at the incident end is taken into account so that the optical signal is transmitted uninterruptedly, and uninterrupted coupling between the input channel and the output channel of the optical signal is achieved.

[0049] The above embodiments are merely descriptions of the preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A multi-channel hollow optical fiber slip ring, characterized in that: include: A stator end of the stator (1) is provided; A rotor end of the rotor (2) is provided; The stator end and the rotor end are rotatably connected to each other; Also included is a combined Dove prism structure (3) disposed in the rotor end; The combined Dove prism structure (3) is positioned between the stator (1) and the rotor (2) and is used to transmit optical signals; The rotor (2) in the rotor end rotates coaxially with the combined Dove prism structure (3), and the rotor end is configured so that when the rotor (2) rotates at a speed ω, the combined Dove prism structure (3) rotates at a speed ω / 2; The combined dove prism structure (3) comprises: A first prism (31) comprising a first incident inclined surface (31_1), a first reflecting surface (31_2), and a first emitting inclined surface (31_3); The second prism (32) is disposed sideways inside the first prism (31), and comprises a second incident inclined surface (32_1), a second reflecting surface (32_2), and a second emitting inclined surface (32_3); The axial cross-sections of the first prism (31) and the second prism (32) are isosceles trapezoidal; The first prism (31) is provided with a first square opening hole (31_4) vertically downward from the top, and the bottom surface of the first square opening hole (31_4) continues to the first reflection surface (31_2); The second prism (32) is provided with a second square opening hole (32_4) vertically downward from the center of the top, and the bottom surface of the second square opening hole (32_4) is extended to the second reflection surface (32_2), so that the cross section of the second incident inclined surface (32_1) is concave; The second dovetail prism (32) is embedded in the first square open hole (31_4) with an overall deflection of 90 degrees, and the top and side walls of the open end of the second square open hole (32_4) are tightly fitted with the inner wall of the first square open hole (31_4); When lying on the side, the central axis of the second square open hole (32_4) cavity coincides with the central axis of the first prism (31); In the rotor (2), a first optical fiber channel (21) is arranged near the outer side of the incident inclined surface of the combined Dove prism structure (3); An incident optical fiber collimator (4) is arranged in the first optical fiber channel (21); In the stator (1), two second optical fiber channels (11) corresponding to the first optical fiber channels (21) are arranged near the outer side of the output inclined surface of the combined Dove prism structure (3); The two second optical fiber channels (11) are arranged vertically, and receiving optical fiber collimators (5) are arranged in the two second optical fiber channels (11).

2. The multi-channel hollow optical fiber slip ring according to claim 1, characterized in that: The cross sections of the first incident inclined surface (31_1), the second incident inclined surface (32_1), the first exit inclined surface (31_3), and the second exit inclined surface (32_3) are all coated with an anti-reflection film layer.

3. The multi-channel hollow optical fiber slip ring according to claim 2, characterized in that: The open end top and side wall of the second square open hole (32_4) are connected to the inner wall of the first square open hole (31_4) by gluing.

Images