A polarization maintaining optical fiber acousto-optic modulator structure

Abstract

The utility model relates to optical fiber acoustooptic modulator, concretely relates to a kind of polarization maintaining optical fiber acoustooptic modulator structure, in the utility model, the axis of the slot direction is set in the two optical fiber fixed clamping groove of same straight line in optical fiber acoustooptic modulator shell, sound light crystal is set in the middle of two optical fiber fixed clamping groove, input optical fiber and output optical fiber are fixed in optical fiber fixed clamping groove, the axis of input optical fiber and the axis of output optical fiber can be kept on same straight line alignment, while optical fiber can be moved along clamping groove and adjust its distance with sound light crystal, and will not deviate misplacement, with the advantages that installation debugging is convenient, input optical fiber and output optical fiber are not prone to misplacement.

Description

Technical Field

[0001] This utility model relates to fiber optic acousto-optic modulators, specifically to a polarization-maintaining fiber optic acousto-optic modulator structure. Background Technology

[0002] Polarization-maintaining acousto-optic modulators (PAEMs) are important optoelectronic devices widely used in communication, sensing, and laser systems. For example, in fiber optic communication systems, PAEMs are used to modulate the intensity and phase of optical signals to achieve high-speed data transmission. Due to their excellent polarization-preserving characteristics, they can effectively reduce signal attenuation and distortion, improving communication quality. In lidar systems, PAEMs are used to control the transmission and reception of laser pulses. By precisely modulating the laser signal, the accuracy and range of target detection can be improved, making them widely used in autonomous driving, terrain mapping, and other fields. When a PAEM is operating, the centerlines of the input and output optical fibers should be kept as straight as possible, and the acousto-optic crystal should be positioned between the input and output fibers, ideally at their center. However, in the fabrication of polarization-maintaining acousto-optic modulators, it is not easy to keep the centerlines of the input and output optical fibers aligned on the same straight line. At the same time, since the acousto-optic crystal needs to be positioned in the middle between the input and output optical fibers, testing equipment needs to be continuously connected during the fabrication process to ensure that not only the input fiber is straight and aligned with the acousto-optic crystal, but also the output fiber is straight and aligned with the acousto-optic crystal. If there is even a slight error, the position and orientation of the input fiber, output fiber, or acousto-optic crystal need to be readjusted, which is very inconvenient. Utility Model Content

[0003] To address the shortcomings of the existing technology, the present invention aims to provide a polarization-maintaining fiber optic modulator structure. By setting fiber fixing slots with the axes of the slotted direction aligned in a straight line within the housing, the fiber direction can be easily fixed, ensuring that the axes of the fibers are aligned in a straight line.

[0004] This utility model discloses a polarization-maintaining fiber optic acousto-optic modulator structure through embodiments, including a housing, an input fiber, and an output fiber, an acousto-optic crystal, and a modulation signal receiving circuit disposed within the housing. The housing includes a first housing and a second housing. The first housing is further provided with a first fiber fixing slot, a second fiber fixing slot, and an acousto-optic crystal base. The axis of the slotting direction of the first fiber fixing slot and the axis of the slotting direction of the second fiber fixing slot are on the same straight line. The acousto-optic crystal base is located between the first fiber fixing slot and the second fiber fixing slot. The end of the input fiber is fixed in the first fiber fixing slot, and the beginning of the output fiber is fixed in the second fiber fixing slot. The acousto-optic crystal is fixed on the acousto-optic crystal base. The modulation signal receiving circuit is fixed on the first housing, and the output end of the modulation signal receiving circuit is connected to the acousto-optic crystal drive.

[0005] Furthermore, the first housing is also provided with an input fiber optic interface, an output fiber optic interface, and a modulation signal interface; the center of the input fiber optic interface is located on the extended axis of the first fiber optic fixing slot in the slotting direction, and the center of the output fiber optic interface is located on the extended axis of the second fiber optic fixing slot in the slotting direction; the end of the input fiber optic cable passes through the input fiber optic interface and is fixed in the first fiber optic fixing slot, and the beginning of the output fiber optic cable is fixed in the second fiber optic fixing slot and then connected to the outside through the output fiber optic interface.

[0006] Furthermore, the end of the input optical fiber is fixed in the first optical fiber fixing slot by the first optical fiber collimator.

[0007] Furthermore, the beginning of the output optical fiber is fixed in the second optical fiber fixing slot by the second optical fiber collimator.

[0008] Furthermore, the modulation signal wire passes through the modulation signal interface and connects to the modulation signal receiving circuit.

[0009] Furthermore, the modulation signal conductors include radio frequency coaxial cables.

[0010] Furthermore, the first outer shell and the second outer shell are provided with a plurality of first screw holes, and the first outer shell and the second outer shell are fixedly connected by bolts and the first screw holes to form an internally enclosed outer shell.

[0011] Furthermore, a second screw hole is provided at each of the two opposite corners of the first outer casing, and the second screw hole is used to fix the outer casing in place.

[0012] Beneficial effects: The polarization-maintaining fiber optic acousto-optic modulator structure provided by this utility model has two fiber optic fixing slots with their axes aligned in the same straight line inside the housing. The acousto-optic crystal is placed in the middle of the two fiber optic fixing slots, and the input fiber and output fiber are fixed in the fiber optic fixing slots. This can keep the center lines of the input fiber and the output fiber aligned in the same straight line. At the same time, the fiber can move along the slots to adjust its distance from the acousto-optic crystal without deviating or misaligning. It has the advantages of convenient installation and debugging, and the input and output fibers are not easily misaligned.

[0013] It should be noted that the terms "first," "second," "left," "right," and similar terms used in this article are merely for describing the constituent elements of the technical solution and do not constitute a limitation on the technical solution, nor should they be interpreted as an indication or implication of the importance of the corresponding elements; elements with terms such as "first," "second," "left," "right," etc., indicate that the corresponding technical solution contains at least one of these elements. Attached Figure Description

[0014] Figure 1 This is an exploded view of the structure of a polarization-maintaining fiber acousto-optic modulator according to this utility model.

[0015] The markings in the diagram are: 11-First housing, 12-Second housing, 13-Input fiber optic interface, 14-Output fiber optic interface, 15-Modulation signal interface, 16-First screw hole, 17-Bolt, 18-Second screw hole, 2-Input fiber, 21-First fiber optic collimator, 3-Output fiber, 31-Second fiber optic collimator, 4-Acousto-optic crystal, 5-Modulation signal receiving circuit, 51-Modulation mode wire, 6-First fiber optic fixing slot, 7-Second fiber optic fixing slot, 8-Acousto-optic crystal base. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Of course, the specific embodiments described below are only for explaining the technical solutions of the present invention, and not for limiting the present invention. Furthermore, the parts described in the embodiments or drawings are merely illustrative examples of relevant parts of the present invention, and not the entirety of the present invention. At the same time, all other embodiments obtained by those skilled in the art based on the embodiments of the present invention should naturally fall within the protection scope of the present invention.

[0017] like Figure 1As shown in the figure, the present invention discloses a polarization-maintaining fiber optic acousto-optic modulator structure, including a housing, an input fiber 2, and an output fiber 3, and an acousto-optic crystal 4 and a modulation signal receiving circuit 5 disposed within the housing. The housing includes a first housing 11 and a second housing 12. The first housing 11 is further provided with a first fiber fixing slot 6, a second fiber fixing slot 7, and an acousto-optic crystal base 8. The axis of the slotting direction of the first fiber fixing slot 6 and the axis of the slotting direction of the second fiber fixing slot 7 are on the same straight line. The acousto-optic crystal base 8 is located between the first fiber fixing slot 6 and the second fiber fixing slot 7. The end of the input fiber 2 is fixed in the first fiber fixing slot 6, and the beginning of the output fiber 3 is fixed in the second fiber fixing slot 7. The acousto-optic crystal 4 is fixed on the acousto-optic crystal base 8. The modulation signal receiving circuit 5 is fixed on the first housing 11, and the output end of the modulation signal receiving circuit 5 is drivenly connected to the acousto-optic crystal 4.

[0018] In this embodiment, the first housing 11 is also provided with an input fiber optic interface 13, an output fiber optic interface 14, and a modulation signal interface 15; the center of the input fiber optic interface 13 is located on the extended axis of the first fiber optic fixing slot 6 in the slotting direction, and the center of the output fiber optic interface 14 is located on the extended axis of the second fiber optic fixing slot 7 in the slotting direction; the end of the input fiber optic 2 passes through the input fiber optic interface 13 and is fixed in the first fiber optic fixing slot 6, and the beginning of the output fiber optic 3 is fixed in the second fiber optic fixing slot 7 and then connected to the outside through the output fiber optic interface 14.

[0019] In this embodiment, the end of the input optical fiber 2 is fixed in the first optical fiber fixing slot 6 by the first optical fiber collimator 21.

[0020] In this embodiment, the beginning of the output optical fiber 3 is fixed in the second optical fiber fixing slot 7 by the second optical fiber collimator 31.

[0021] In this embodiment, the modulation signal wire 51 passes through the modulation signal interface 15 and is connected to the modulation signal receiving circuit 5.

[0022] In this embodiment, the modulation signal conductor 51 includes a radio frequency coaxial cable.

[0023] In this embodiment, the first outer shell 11 and the second outer shell 12 are provided with a plurality of first screw holes 17, and the first outer shell 11 and the second outer shell 12 are fixedly connected by bolts 17 and first screw holes 16 to form an internally closed outer shell.

[0024] In this embodiment, the first outer shell 11 is also provided with two opposite corners of the first outer shell 16, and the second screw holes 16 are used to fix the outer shell to other objects.

[0025] Working principle: The structure of this device is mainly designed to facilitate the installation of the input optical fiber 2 and the output optical fiber 3, so that the position of the axis is not easily changed during the adjustment of their relative position with the acousto-optic crystal 4. The axis of the input optical fiber 2 and the axis of the output optical fiber 3 always move on the same straight line, which has the advantages of convenient installation and the input and output optical fibers are not easily misaligned.

[0026] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] It should be noted that the above embodiments are only for more clearly illustrating the technical solution of this utility model. Those skilled in the art will understand that the implementation of this utility model is not limited to the above content. Any obvious changes, substitutions or replacements made based on the above content do not exceed the scope of the technical solution of this utility model. Other implementations will also fall within the scope of this utility model without departing from the concept of this utility model.

Claims

1. A polarization-maintaining fiber optic acousto-optic modulator structure, comprising a housing, an input fiber, and an output fiber, and an acousto-optic crystal and a modulation signal receiving circuit disposed within the housing, characterized in that: The housing includes a first housing and a second housing. The first housing is further provided with a first optical fiber fixing slot, a second optical fiber fixing slot, and an acousto-optic crystal base. The axis of the slotting direction of the first optical fiber fixing slot and the axis of the slotting direction of the second optical fiber fixing slot are on the same straight line. The acousto-optic crystal base is located between the first optical fiber fixing slot and the second optical fiber fixing slot. The end of the input optical fiber is fixed in the first optical fiber fixing slot, and the beginning of the output optical fiber is fixed in the second optical fiber fixing slot; the acousto-optic crystal is fixed on the acousto-optic crystal base; The modulation signal receiving circuit is fixed on the first housing, and the output terminal of the modulation signal receiving circuit is connected to the acousto-optic crystal driver.

2. The polarization-maintaining fiber acousto-optic modulator structure according to claim 1, characterized in that: The first housing is also provided with an input fiber optic interface, an output fiber optic interface and a modulation signal interface; the center of the input fiber optic interface is located on the extended line of the axis of the first fiber optic fixing slot in the slotting direction, and the center of the output fiber optic interface is located on the extended line of the axis of the second fiber optic fixing slot in the slotting direction. The end of the input optical fiber passes through the input optical fiber interface and is fixed in the first optical fiber fixing slot. The beginning of the output optical fiber is fixed in the second optical fiber fixing slot and then connected to the outside through the output optical fiber interface.

3. The polarization-maintaining fiber acousto-optic modulator structure according to claim 1 or 2, characterized in that: The end of the input optical fiber is fixed in the first optical fiber fixing slot by the first optical fiber collimator.

4. The polarization-maintaining fiber acousto-optic modulator structure according to claim 1 or 2, characterized in that: The beginning of the output optical fiber is fixed in the second optical fiber fixing slot by the second optical fiber collimator.

5. The polarization-maintaining fiber acousto-optic modulator structure according to claim 2, characterized in that: The modulation signal wire passes through the modulation signal interface and connects to the modulation signal receiving circuit.

6. The polarization-maintaining fiber acousto-optic modulator structure according to claim 5, characterized in that: The modulation signal conductor includes a radio frequency coaxial cable.

7. The polarization-maintaining fiber acousto-optic modulator structure according to claim 1, characterized in that: The first outer shell and the second outer shell are provided with a plurality of first screw holes, and the first outer shell and the second outer shell are fixedly connected by bolts and the first screw holes to form an internally enclosed outer shell.

8. The polarization-maintaining fiber acousto-optic modulator structure according to claim 1, characterized in that: The first outer casing is also provided with a second screw hole at each of the two opposite corners, and the second screw hole is used to fix the outer casing in place.

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