1xn optical switch based on bragg acousto-optic modulation and fiber array coupling structure

Abstract

The application discloses a 1xN optical switch based on Bragg acousto-optic modulation and a fiber array coupling structure, the 1xN optical switch comprising an acousto-optic material body and a radio frequency switch module, the cross section of the light transmission direction of the acousto-optic material body being a regular polygon, the acousto-optic material body being configured to allow incident light to be incident along the central axis direction of the acousto-optic material body, the included angle between each working surface and the direction of the incident light being a Bragg angle, so that the incident light can be Bragg diffracted at each working surface; a piezoelectric transducer is correspondingly arranged on each working surface, the input end of the radio frequency switch module being configured to receive a single fixed frequency radio frequency signal, the output end of the radio frequency switch module being electrically connected with each piezoelectric transducer respectively and being configured to be capable of outputting a signal to only one piezoelectric transducer at any time. A collimating lens is arranged behind the 1xN optical switch, converting the divergent angle diffraction light beam into a parallel light beam, which is correspondingly coupled into N optical fibers through an optical fiber collimator.

Description

Technical Field

[0001] This invention relates to the field of optical communication and acousto-optic modulation technology, specifically to a 1×N optical switch and fiber array coupling structure based on Bragg acousto-optic modulation. Background Technology

[0002] Optical switches are core components in optical communication networks and optical signal processing systems. Currently, mainstream optical switches include mechanical optical switches, MEMS optical switches, magneto-optical switches, and acousto-optical switches. Among them, acousto-optical switches are widely used as high-speed optical shutters due to their advantages such as microsecond-level high-speed response, no mechanical wear, and strong stability. However, their application in the rapid switching of 1×N optical signal transmission channels still has several limitations.

[0003] Existing acousto-optic 1×N optical switches all employ traditional rectangular or near-rectangular acousto-optic materials, paired with single or multiple piezoelectric transducers. By changing the radio frequency drive frequency, the ultrasonic wavelength is adjusted, thereby altering the Bragg diffraction angle and enabling the selection of different optical channels. This technology suffers from several drawbacks: First, it requires multi-frequency radio frequency sources or frequency sweep drives, resulting in complex circuit control systems and high costs. Second, different channels correspond to different drive frequencies, leading to poor diffraction efficiency, poor spot uniformity, and insufficient signal transmission stability. Third, the incident light must be obliquely incident to satisfy the Bragg condition, making optical path alignment cumbersome and resulting in significant end-face reflection loss. Fourth, frequency modulation of a single transducer easily generates multi-frequency crosstalk, limiting the isolation of optical channels. Fifth, the acousto-optic interaction matching of the incident light is limited, making spatial separation difficult. These disadvantages restrict the application of acousto-optic switches as core optical switching devices in optical communication networks and optical signal processing systems. Summary of the Invention

[0004] To address the shortcomings of the existing technologies, the technical problem to be solved by this invention is: how to provide a 1×N optical switch based on Bragg acousto-optic modulation that enables fixed-frequency driving, high-speed crosstalk-free optical channel selection, simplifies the system structure, and improves channel consistency and transmission stability.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A 1×N optical switch based on Bragg acousto-optic modulation includes an acousto-optic material body and a radio frequency switch module. The cross-section of the acousto-optic material body in the light transmission direction is a regular polygon. The acousto-optic material body has M side surfaces, of which N side surfaces are working surfaces, where M≥3, N≥2, and M≥N. The acousto-optic material body is configured such that incident light is incident along the central axis of the acousto-optic material body. The angle between each working surface and the direction of the incident light is the Bragg angle, so that the incident light can undergo Bragg diffraction at each working surface.

[0007] Each working surface is equipped with a piezoelectric transducer. Each piezoelectric transducer is used to excite ultrasonic waves in different directions within the acousto-optic material to form an acousto-optic refractive index grating in the corresponding direction. The input terminal of the radio frequency switch module is configured to receive a single fixed-frequency radio frequency signal. The output terminal of the radio frequency switch module is electrically connected to each piezoelectric transducer and is configured to output a signal to only one piezoelectric transducer at any given time.

[0008] In this invention, the regular polygonal structure ensures that the angles of each working surface relative to the central axis are naturally consistent. Therefore, all channels can satisfy the Bragg diffraction condition by being driven by the same fixed frequency, completely eliminating the need for complex frequency conversion or sweep frequency control systems in existing technologies, greatly simplifying the circuit structure and reducing costs. The incident light is perpendicular to the central axis, eliminating the need to adjust the optical path angle for each channel individually, significantly reducing end-face reflection loss and making optical path alignment extremely convenient. A single radio frequency signal, combined with a radio frequency switch, switches the sound field orientation, fundamentally eliminating the crosstalk problem caused by the simultaneous existence of multiple frequency sound fields, and greatly improving the isolation of the optical channels. At the same time, the diffraction efficiency, spot quality, and loss characteristics of each channel are naturally consistent, effectively ensuring the stability of signal transmission.

[0009] A 1×N optical switch based on Bragg acousto-optic modulation includes an acousto-optic material body and a radio frequency switch module. The acousto-optic material body is cut from a blank with a regular polygonal cross-section in the light transmission direction. The blank has 2K side surfaces, where K≥3. After cutting, K consecutive complete side surfaces and 1 partially cut residual side surface are retained. The K complete side surfaces are the working surfaces. The acousto-optic material body is configured such that incident light is incident along the central axis of the blank. The angle between each working surface and the direction of the incident light is the Bragg angle, so that the incident light can undergo Bragg diffraction at each working surface.

[0010] Each working surface is equipped with a piezoelectric transducer. Each piezoelectric transducer is used to excite ultrasonic waves in different directions within the acousto-optic material to form an acousto-optic refractive index grating in the corresponding direction. The input terminal of the radio frequency switch module is configured to receive a single fixed-frequency radio frequency signal. The output terminal of the radio frequency switch module is electrically connected to each piezoelectric transducer and is configured to output a signal to only one piezoelectric transducer at any given time.

[0011] In this invention, while retaining all the advantages of the overall acousto-optic material body (fixed frequency drive, vertical incidence, RF switch switching), half of the non-optical channel selection side of the regular polygonal blank is removed by a semi-circular cutting process, making the device more compact in physical structure and facilitating miniaturized integrated packaging. The cutting clearance surface formed after cutting also has a sound absorption function, which can effectively absorb stray sound waves generated by ultrasonic reflection inside the acousto-optic material, suppress standing wave noise and parasitic diffraction, further reduce crosstalk between channels and improve the signal-to-noise ratio. The cutting surface can also be directly used as the mounting reference surface of the device, simplifying the assembly and positioning of the device with the external structure and improving the stability and manufacturability of the overall structure.

[0012] As an optimization, the Bragg angle satisfy: , The wavelength of the incident light is given. The refractive index of the acousto-optic material body is given. The speed at which ultrasound propagates within the acousto-optic material is denoted as . The frequency of the single fixed-frequency radio frequency signal is defined. The functionally defined Bragg angle is transformed into a quantifiable physical parameter, enabling those skilled in the art to precisely design the tilt angle of each working surface based on the actual selected optical wavelength, acousto-optic material, and operating frequency. Once the material and operating frequency are determined, the Bragg angle is determined solely by the aforementioned fixed parameter, theoretically demonstrating that a single fixed-frequency drive can fully satisfy the Bragg conditions for all channels.

[0013] As an optimization, the acousto-optic interaction length between each of the working surfaces and the incident light is the same. The acousto-optic interaction length is a key geometric parameter that determines the Bragg diffraction efficiency. The fact that the interaction lengths of each working surface are completely consistent means that the acousto-optic energy exchange distance traversed by the diffracted light is equal regardless of which channel the RF switch is switched to.

[0014] As an optimization, the acousto-optic material body is made of isotropic acousto-optic glass material. The characteristic of isotropic materials is that their physical properties (including refractive index, sound velocity, acousto-optic coefficient, etc.) are exactly the same in all directions. This makes the acousto-optic diffraction parameters at each working surface of the regular polygon naturally consistent, eliminating the need for differential compensation of material properties for different directions, and further ensuring channel consistency.

[0015] As an optimization, when the RF switch module selects any one of the output terminals, the piezoelectric transducers corresponding to the other output terminals are in a silent state. This ensures, logically, that at any given time, only one direction of ultrasonic waves is excited within the acousto-optic material, and that only one set of acousto-optic refractive index gratings exists within the material, thus avoiding potential sound field interference and cross-diffraction that might occur when multiple ultrasonic waves exist simultaneously.

[0016] As an optimization, the number of sides of the acousto-optic material body is M≥6, and M=N.

[0017] As an optimization, the cross-section of the blank along the light transmission direction is a regular hexagon, a regular octagon, or a regular decagon. These three specifications cover the most common small-channel requirements of 1×N optical switches, providing a clear optimal implementation choice for different application scenarios.

[0018] A fiber optic lens array coupling structure for a 1×N optical switch includes a 1×N optical switch, a collimating lens, and a multi-fiber collimator. The 1×N optical switch is the optical switch described above. The collimating lens is disposed on the output end face of the 1×N optical switch and is used to convert the divergence angle diffracted beams emitted from each output end face into parallel beams. The multi-fiber collimator is disposed on the output path of the parallel beams and is used to couple the N parallel beams one-to-one into the N optical fibers.

[0019] By using collimating lenses to pre-convert diffracted beams with different divergence angles into parallel beams, coupling loss caused by beam divergence angles is fundamentally eliminated. This transforms subsequent coupling alignment from adjusting each diverging beam individually to aligning the parallel beam array all at once, significantly reducing alignment difficulty. The combination of parallel beams and multi-fiber collimators enables multi-channel synchronous coupling, significantly shortening the assembly cycle and improving production efficiency. The one-to-one correspondence between each collimating channel and each parallel beam in the multi-fiber collimator ensures the consistency of coupling loss across channels.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] (1) This invention overturns the traditional technical route of frequency conversion and angle adjustment of sound and light switch. By combining the body of regular polygonal sound and light material with fixed frequency radio frequency drive and radio frequency switch channel selection, a brand-new switching mechanism of fixed frequency commutation is realized. The complex sweep frequency / conversion control system is completely eliminated, the circuit structure is extremely simple, and the cost is greatly reduced.

[0022] (2) The incident light is perpendicular to the central axis and can meet the Bragg diffraction conditions on each working surface without angle adjustment, eliminating the drawbacks of cumbersome oblique incident alignment and large end face reflection loss; the symmetry and consistency of each working surface make the diffraction efficiency, insertion loss and spot quality of each channel naturally uniform, and the channel consistency is significantly better than that of traditional frequency-modulated acousto-optic switch.

[0023] (3) The radio frequency switch selects only one transducer at any given time, while the other transducers remain silent, thus eliminating multi-frequency crosstalk at the source. In the half-cut scheme, the cutting avoidance surface further absorbs stray sound waves and suppresses standing wave noise, significantly improving channel isolation and signal-to-noise ratio. Combining the acousto-optic modulation nanosecond-level response with the characteristics of high-speed radio frequency switches, ultra-high-speed optical channel switching is realized.

[0024] (4) The collimating lens at the output end converts the multi-path diffraction beams with different divergence angles into a parallel beam array. Combined with the multi-fiber collimator, it realizes multi-channel synchronous coupling alignment, completely eliminating the tedious process of debugging one path at a time. The assembly efficiency and channel coupling consistency are significantly improved. The device as a whole has excellent anti-interference ability and long-term transmission stability, and is suitable for high-speed integrated optical switching system applications. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the architecture of the 1×N optical switch in this invention;

[0026] Figure 2 This is a diffraction diagram of Embodiment 1 of the present invention;

[0027] Figure 3 This is a schematic diagram of the Bragg angle setting in Embodiment 1 of the present invention;

[0028] Figure 4 This is a schematic diagram of the cutting structure of a regular hexagonal blank according to Embodiment 3 of the present invention;

[0029] Figure 5 This is a schematic diagram of sound wave absorption within the acousto-optic material body after the cut surface in Embodiment 3 of the present invention;

[0030] Figure 6 This is a schematic diagram of the coupling structure in Embodiment 4 of the present invention;

[0031] Figure 7 This is a schematic diagram of the coupled optical path in Embodiment 4 of the present invention. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0033] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship commonly used when the product is in use. They are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. In addition, the terms "horizontal," "vertical," etc., do not indicate that the component is required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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 invention based on the specific circumstances.

[0034] Example 1

[0035] like Figures 1 to 3 As shown, the 1×N optical switch based on Bragg acousto-optic modulation in this embodiment is characterized by comprising an acousto-optic material body 1 and a radio frequency switch module.

[0036] The cross-section of the acousto-optic material body 1 in the light-transmitting direction is a regular polygon, such as a regular hexagon (M=6), a regular heptagon (M=7), or a regular octagon (M=8). The acousto-optic material body 1 has M side faces, of which N side faces are working surfaces, M≥3, N≥2, and M≥N. In this embodiment, a regular hexagon with M=N=6 is used as an example, that is, all 6 side faces of the regular hexagon are working surfaces, forming a 1×6 optical switch.

[0037] The acousto-optic material body 1 is made of isotropic acousto-optic glass material, preferably any one of fused silica, chalcogenide glass, heavy flint glass, or tellurite glass. The light transmission direction of the acousto-optic material body 1 is arranged along its geometric central axis.

[0038] The incident light is incident along the geometric central axis of the acousto-optic material body 1. The angle between each working surface and the direction of the incident light is the Bragg angle. This allows the incident light to undergo Bragg diffraction at each of the said working surfaces. The Bragg angle... satisfy: , The wavelength of the incident light is given. The refractive index of the acousto-optic material body is given. The speed at which ultrasound propagates within the acousto-optic material is denoted as . The frequency of the single fixed-frequency radio frequency signal.

[0039] Each working surface is equipped with a piezoelectric transducer 2, totaling 6 sets. Each piezoelectric transducer 2 is used to excite ultrasonic waves in different directions within the acousto-optic material body 1 to form an acousto-optic refractive index grating in the corresponding direction. The acousto-optic interaction length between each working surface and the incident light is exactly the same to ensure that the diffraction efficiency, optical signal loss, and light spot quality of each channel are highly consistent.

[0040] The input terminal of the RF switch module is used to receive a single fixed-frequency RF signal. The RF switch module has N output terminals, each of which is electrically connected to each group of piezoelectric transducers 2. At any given time, the RF switch module selects only one output terminal, that is, it outputs an RF signal to only one piezoelectric transducer 2, while the piezoelectric transducers 2 corresponding to the other output terminals remain in a silent state.

[0041] When a piezoelectric transducer 2 in a certain channel is selected, the incident light undergoes Bragg diffraction under the action of the corresponding acousto-optic grating, generating first-order diffracted light in a single direction, thus enabling the selection of that optical channel. By switching the RF switch channel, the diffraction direction can be quickly switched to complete the selection of different optical output channels, realizing the 1×N optical switch function.

[0042] Example 2

[0043] In another embodiment, when M>N (for example, a regular pentagon has 5 sides, 3 of which are working surfaces), the remaining MN sides can be used as idle surfaces or auxiliary surfaces that do not participate in the acoustic-optical interaction, and the 1×N optical switch function can still be realized.

[0044] Example 3

[0045] like Figure 4 and Figure 5 As shown, another 1×N optical switch based on Bragg acousto-optic modulation in this embodiment includes an acousto-optic material body 1 and a radio frequency switch module.

[0046] The acousto-optic material body 1 is cut from a blank with a regular polygonal cross-section in the light transmission direction. The blank has 2K side faces, where K≥3. In this embodiment, a regular hexagonal blank (2K=6, K=3) is used as an example for illustration.

[0047] During cutting, K consecutive complete side faces are retained as working surfaces, while the remaining K consecutive side faces are removed, resulting in one partially cut residual side face. Taking a regular hexagon as an example, its side faces are numbered 1 to 6 clockwise. Side faces numbered 1, 2, and 3 are selected as working surfaces, and sides numbered 4, 5, and 6 are selected as the areas to be removed. The cutting line starts from the edge between sides numbered 1 and 6, cutting along a non-diagonal direction to the surface of side face number 4, completely removing sides numbered 5 and 6, and partially removing side face number 4. After cutting, three consecutive complete side faces (numbered 1, 2, and 3) and one partially cut residual side face (partial residual side face number 4) are retained. The residual side face number 4 does not have a piezoelectric transducer 2 installed and is not used as a working surface. The cut surface formed after cutting is used to absorb stray ultrasonic waves and provide a mounting reference surface.

[0048] The incident light is incident along the geometric central axis of the billet, and the angle between each working surface and the direction of the incident light is the Bragg angle. This is to ensure that the incident light undergoes Bragg diffraction at each of the said working surfaces. The Bragg angle... It satisfies the same formula as in Example 1.

[0049] Each of the working surfaces is respectively provided with a piezoelectric transducer 2. Each of the piezoelectric transducers 2 is used to excite ultrasonic waves in different directions within the acousto-optic material body 1 to form an acousto-optic refractive index grating in the corresponding direction.

[0050] The input terminal of the radio frequency switch module is used to receive a single fixed-frequency radio frequency signal. The output terminal of the radio frequency switch module is electrically connected to each of the piezoelectric transducers 2 and is configured to output a radio frequency signal to only one of the piezoelectric transducers 2 at any given time.

[0051] In this embodiment, the cross-section of the blank along the light transmission direction is preferably a regular hexagon (corresponding to K=3, realizing a 1×3 light switch), a regular octagon (corresponding to K=4, realizing a 1×4 light switch), or a regular decagon (corresponding to K=5, realizing a 1×5 light switch).

[0052] Example 4

[0053] like Figure 6 and Figure 7 As shown, this embodiment provides a fiber optic lens array coupling structure for a 1×N optical switch, including a 1×N optical switch, a collimating lens 3, and a multi-fiber collimator 4.

[0054] The 1×N optical switch is the 1×N optical switch based on Bragg acousto-optic modulation described in Embodiment 1 or Embodiment 3.

[0055] The collimating lens 3 is disposed on each exit face of the 1×N optical switch. Specifically, a miniature collimating lens 3 is installed on each exit face of the 1×N optical switch by means of adhesive dispensing and curing, so that the divergent beam emitted from each exit face is converted into a parallel beam after passing through the collimating lens 3.

[0056] The multi-fiber collimator 4 is positioned along the exit path of the parallel beam. The multi-fiber collimator 4 has N collimation channels, each corresponding to a specific parallel beam. The N parallel beams are coupled one-to-one into N optical fibers via the multi-fiber collimator 4.

[0057] During the coupling alignment process, the multi-fiber collimator 4 is first coarsely aligned with the 1×N optical switch, using the positioning reference of the 1×N optical switch as a reference. Then, the optical power values ​​of each channel are monitored in real time, and the position and attitude of the multi-fiber collimator 4 (including translation, pitch, and yaw angle adjustments) are finely adjusted to optimize the optical power of each channel. After the alignment is achieved, the multi-fiber collimator 4 and the 1×N optical switch are integrally cured and locked together using UV-curable adhesive or mechanical clamping blocks, completing the integrated coupling and encapsulation.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described with reference to preferred embodiments, those skilled in the art should understand that various changes in form and detail can be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A 1×N optical switch based on Bragg acousto-optic modulation, characterized in that: The acousto-optic material body and the radio frequency switch module are included. The cross-section of the acousto-optic material body in the light transmission direction is a regular polygon. The acousto-optic material body has M side surfaces, of which N side surfaces are working surfaces, where M≥3, N≥2, and M≥N. The acousto-optic material body is configured such that the incident light is incident along the central axis of the acousto-optic material body. The angle between each working surface and the direction of the incident light is the Bragg angle, so that the incident light can undergo Bragg diffraction at each working surface. Each working surface is equipped with a piezoelectric transducer. Each piezoelectric transducer is used to excite ultrasonic waves in different directions within the acousto-optic material to form an acousto-optic refractive index grating in the corresponding direction. The input terminal of the radio frequency switch module is configured to receive a single fixed-frequency radio frequency signal. The output terminal of the radio frequency switch module is electrically connected to each piezoelectric transducer and is configured to output a signal to only one piezoelectric transducer at any given time.

2. A 1×N optical switch based on Bragg acousto-optic modulation, characterized in that: The acousto-optic material body and the radio frequency switch module are included. The acousto-optic material body is cut from a blank with a regular polygonal cross-section in the light transmission direction. The blank has 2K side surfaces, K≥3. After cutting, K consecutive complete side surfaces and 1 partially cut residual side surface are retained. Among them, the K complete side surfaces are the working surfaces. The acousto-optic material body is configured such that the incident light is incident along the central axis of the blank. The angle between each working surface and the direction of the incident light is the Bragg angle, so that the incident light can undergo Bragg diffraction at each working surface. Each working surface is equipped with a piezoelectric transducer. Each piezoelectric transducer is used to excite ultrasonic waves in different directions within the acousto-optic material to form an acousto-optic refractive index grating in the corresponding direction. The input terminal of the radio frequency switch module is configured to receive a single fixed-frequency radio frequency signal. The output terminal of the radio frequency switch module is electrically connected to each piezoelectric transducer and is configured to output a signal to only one piezoelectric transducer at any given time.

3. The 1×N optical switch based on Bragg acousto-optic modulation according to claim 1 or 2, characterized in that: The Prague Corner satisfy: , The wavelength of the incident light is given. The refractive index of the acousto-optic material body is given. The speed at which ultrasound propagates within the acousto-optic material is denoted as . The frequency of the single fixed-frequency radio frequency signal.

4. The 1×N optical switch based on Bragg acousto-optic modulation according to claim 1 or 2, characterized in that: The acousto-optic interaction length between each of the working surfaces and the incident light is the same.

5. The 1×N optical switch based on Bragg acousto-optic modulation according to claim 1 or 2, characterized in that: The acousto-optic material body is made of isotropic acousto-optic glass material.

6. The 1×N optical switch based on Bragg acousto-optic modulation according to claim 1 or 2, characterized in that: When the radio frequency switch module selects any one of the output terminals, the piezoelectric transducers corresponding to the other output terminals are in a silent state.

7. The 1×N optical switch based on Bragg acousto-optic modulation according to claim 1, characterized in that: The number of sides of the acousto-optic material body is M≥6, and M=N.

8. The 1×N optical switch based on Bragg acousto-optic modulation according to claim 1, characterized in that: The cross-section of the blank along the light transmission direction is a regular hexagon, a regular octagon, or a regular decagon.

9. A fiber optic lens array coupling structure for a 1×N optical switch, characterized in that: It includes a 1×N optical switch, a collimating lens, and a multi-fiber collimator. The 1×N optical switch is the optical switch as described in any one of claims 1 or 2. The collimating lens is disposed on the emission end face of the 1×N optical switch and is used to convert the divergence angle diffracted beams emitted from each emission end face into parallel beams. The multi-fiber collimator is disposed on the emission path of the parallel beams and is used to couple the N parallel beams one-to-one into the N optical fibers.

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