Reflection type array optical switch and optical switching method thereof

Abstract

The invention relates to the technical field of optical switches, in particular to a reflective array optical switch and an optical switching method thereof.A collimator array, a rotating mirror array and a first reflector which are coupled in sequence are arranged, a circulator is arranged at each optical fiber port of the collimator array, signal light is received through the input ends of the circulators, and the signal light is transmitted through the first reflector; the isolation end of the circulator transmits the signal light to the rotating mirror array, then the signal light can be reflected to the first reflecting mirror by adjusting the rotating angle of the corresponding rotating mirror unit in the rotating mirror array, and the first reflecting mirror reflects the signal light to any rotating mirror unit in the rotating mirror array. The rotating mirror unit reflects the signal light back to the isolation end of any circulator and outputs the signal light from the output end of the corresponding circulator; according to the invention, only one group of collimator array is matched with the rotating mirror array and the first reflecting mirror, so that the connection and switching of MxN optical paths of the same scale can be realized, the optical paths are greatly simplified, and the assembly efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of optical switches, and in particular to a reflective array optical switch and an optical switching method thereof. Background Art

[0002] The MxN array optical switch is the most important core of an optical circuit switch (OCS). It is mainly an array optical switch chip and device based on micro-electro-mechanical system (MEMS) technology, and is a large-capacity centralized optical switching technology. The MxN array optical switch can achieve arbitrary pairing connections between M input channels and N output channels. The MEMS micromirror array realized based on semiconductor processing technology is driven by an external circuit to control the spatial path of optical signals. Combined with a multi-dimensional optical switching optical system and the stable packaging of large-size optical devices, the channel switching of optical signals between two-dimensional input and output is realized. It has the advantages of low power consumption, low cost, small size, high speed, etc., and realizes the non-blocking routing and switching combination function of M optical inputs to N optical outputs. The switching is all based on the optical layer without wavelength switching or electrical switching, and is mainly applied to the interconnection between large data centers and within data centers, reconfigurable optical add-drop multiplexer (ROADM) optical switching, and cloud computing.

[0003] OCS usually has M inputs and N outputs. As Figure 1 shown, an MxN matrix switch is provided, and arbitrary connections between input and output channels can be realized through an internal MEMS deflecting mirror. The mainstream solution of the OCS optical path switch is composed of MEMS array optical switches, and the internal schematic diagram is as Figure 2 shown, which is composed of two groups of two-dimensional fiber collimator arrays for input / output (denoted by A in the figure) and two groups of MEMS array deflecting mirrors (denoted by B in the figure). The traditional MxN OCS needs to set two groups of N-way two-dimensional fiber collimator arrays and N-way MEMS array deflecting mirrors for input / output. Currently, the array optical switch usually needs to configure two corresponding collimator arrays and two groups of MEMS array deflecting mirrors at the input and output ends, with high component costs, complex optical paths during actual assembly, and great coupling difficulty. At the same time, the method for monitoring the working state of each channel is relatively complex, and the cost of components is high.

[0004] In view of this, overcoming the defects of the existing technology is an urgent problem to be solved in this technical field. Summary of the Invention

[0005] The technical problem to be solved by the present invention is how to solve the problems of high component cost, complex optical path matching, and large coupling difficulty in traditional MxN optical path switches.

[0006] The present invention adopts the following technical solutions:

[0007] In a first aspect, a reflective array optical switch is provided, including: a collimator array 1, a rotating mirror array 2, and a first reflector 3 that are sequentially coupled along an optical path; the collimator array 1 includes a plurality of optical fiber ports, and a circulator 10 is provided at each optical fiber port;

[0008] The input end of the circulator 10 is used to receive signal light, and the isolation end of the circulator 10 is used to transmit the signal light to the rotating mirror array 2;

[0009] The rotating mirror array 2 is used to reflect the signal light to the first reflector 3; wherein, by adjusting the rotation angle of the corresponding rotating mirror unit, channel switching is achieved;

[0010] The first reflector 3 is used to reflect the signal light to any one of the rotating mirror units in the rotating mirror array 2, and the corresponding rotating mirror unit reflects the signal light back to the isolation end of the corresponding circulator 10, and the signal light is output from the output end of the corresponding circulator 10.

[0011] Preferably, it further includes a second reflector 4, a monitoring light source assembly 5, and a camera assembly 6;

[0012] The second reflector 4 is coupled between the collimator array 1 and the rotating mirror array 2; the monitoring light source assembly 5 is coupled to the second reflector 4; the rotating mirror array 2, the first reflector 3, and the camera assembly 6 are sequentially coupled along the optical path;

[0013] The monitoring light source assembly 5 is used to emit monitoring light, and the monitoring light is incident on the second reflector 4;

[0014] The second reflector 4 is used to combine the signal light and the monitoring light into the same optical path to obtain coupled light, and transmit the coupled light to the rotating mirror array 2;

[0015] The rotating mirror array 2 is used to reflect the coupled light to the first reflector 3;

[0016] The first reflector 3 is used to transmit the monitoring light in the coupled light to the camera assembly 6, and reflect the signal light in the coupled light to the rotating mirror array 2, and the camera assembly 6 monitors the spot position of the monitoring light to feedback whether the rotation angle of the corresponding rotating mirror unit meets the channel switching requirement.

[0017] Preferably, the imaging component 6 and the rotating mirror array 2 are in relative mirror image positions with respect to the reflecting surface of the first mirror 3.

[0018] Preferably, the collimator array 1 and the monitoring light source component 5 are in relative mirror image positions with respect to the reflecting surface of the second mirror 4.

[0019] Preferably, the monitoring light source component 5 includes an infrared light source 50, a shaping lens 51, a collimating lens 52, and a mask plate 53 that are sequentially coupled along the optical path;

[0020] The infrared light source 50 is used to emit infrared light, the shaping lens 51 is used to expand and correct the infrared light, the collimating lens 52 is used to collimate the expanded and corrected infrared light, and the mask plate 53 is used to convert the collimated infrared light into multi-channel parallel monitoring light and transmit the monitoring light to the reflecting surface of the second mirror 4.

[0021] Preferably, the aperture diameter of each through hole in the mask plate 53 is smaller than the diameter of each rotating mirror unit in the rotating mirror array 2, and the distance between each through hole in the mask plate 53 matches the distance between each channel in the collimator array 1.

[0022] Preferably, the imaging component 6 includes a light homogenizing plate 60, a lens 61, and an infrared camera 62;

[0023] The reflective array optical switch further includes a control unit; the control unit is connected to the signal terminal of the infrared camera 62 and the control terminal of the rotating mirror array 2;

[0024] The lens 61 and the infrared camera 62 are used to obtain a dot matrix image formed by the monitoring light on the light homogenizing plate 60;

[0025] The control unit is used to determine the abnormal points that are offset on the light homogenizing plate 60 according to the dot matrix image, and adjust the rotation angle of the rotating mirror unit corresponding to the abnormal points.

[0026] In a second aspect, a light switching method for a reflective array optical switch is provided. The light switching method is implemented in the reflective array optical switch as described in the first aspect, and includes:

[0027] The input end of the circulator 10 receives the signal light, and the isolation end of the circulator 10 transmits the signal light to the rotating mirror array 2;

[0028] The rotating mirror array 2 receives a channel switching signal, determines the rotating mirror units that need to be adjusted in rotation angle according to the channel switching signal, and adjusts the rotation angle of the corresponding rotating mirror units to reflect the signal light to the first mirror 3;

[0029] The first mirror 3 reflects the signal light to any one of the mirror units in the mirror array 2, and the corresponding mirror unit reflects the signal light back to the isolation end of the corresponding circulator 10, and the signal light is output from the output end of the corresponding circulator 10.

[0030] Preferably, the method further includes:

[0031] The monitoring light source assembly 5 emits monitoring light, and the second mirror 4 multiplexes the signal light and the monitoring light into the same optical path to obtain coupled light, and transmits the coupled light to the mirror array 2;

[0032] The mirror array 2 transmits the coupled light to the first mirror 3;

[0033] The first mirror 3 transmits the monitoring light in the coupled light to the imaging component 6, and reflects the signal light in the coupled light to the mirror array 2;

[0034] The imaging component 6 monitors the spot position of the monitoring light, and adjusts the rotation angle of the corresponding mirror unit according to the spot position until the channel switching requirement is met.

[0035] Preferably, the channel switching signal is: the first signal light emitted by the first channel is switched to be received by the second channel, and the second signal light emitted by the second channel is switched to be received by the first channel; wherein, the first channel corresponds to the first mirror unit, and the second channel corresponds to the second mirror unit;

[0036] The imaging component 6 monitors the spot position of the monitoring light, and adjusting the rotation angle of the corresponding mirror unit according to the spot position until the channel switching requirement is met includes:

[0037] Obtain a reference dot matrix image of the monitoring light of all channels in the initial channel state on the light homogenizing plate 60, wherein the reference dot matrix image is composed of converging spots distributed in an array, and one converging spot and one mirror unit are in a relative mirror image with respect to the reflecting surface of the first mirror 3;

[0038] The imaging component 6 monitors the first spot position of the first monitoring light on the light homogenizing plate 60, and monitors the second spot position of the second monitoring light on the light homogenizing plate 60, wherein the first monitoring light is the monitoring light corresponding to the first signal light, and the second monitoring light is the monitoring light corresponding to the second signal light;

[0039] Taking the reference dot matrix image as a reference, when it is detected that the first spot position coincides with the converging spot corresponding to the second mirror unit, and the second spot position coincides with the converging spot corresponding to the first mirror unit, the rotation angles of the second mirror unit and the first mirror unit both meet the channel switching requirements.

[0040] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0041] In the present invention, a collimator array 1, a rotating mirror array 2 and a first reflector 3 are sequentially coupled, and a circulator 10 is arranged at each optical fiber port of the collimator array 1. The signal light is received through the input end of the circulator 10, and the signal light is transmitted to the rotating mirror array 2 through the isolation end of the circulator 10. Then, by adjusting the rotation angle of the corresponding rotating mirror unit in the rotating mirror array 2, the signal light can be reflected onto the first reflector 3. The first reflector 3 reflects the signal light back to any rotating mirror unit in the rotating mirror array 2, and then the rotating mirror unit reflects the signal light back to the isolation end of any circulator 10 and outputs it from the output end of the corresponding circulator 10. By using only a set of collimator array 1 in cooperation with the rotating mirror array 2 and the first reflector 3, the connection and switching of the MxN optical path of the same scale can be realized, greatly simplifying the optical path and improving the assembly efficiency.

[0042] At the same time, the circulator 10 in the collimator array 1 realizes the directional transmission and isolation of the signal light, reducing the mutual interference between different optical paths. The coupling method between the rotating mirror array 2, the collimator array 1 and the first reflector 3 is based on the principle of light reflection. Compared with the complex optical path coupling method in the traditional optical path switch, this reflection-based coupling method is easier to implement and control, reducing the coupling difficulty. Description of the Drawings

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0044] Figure 1 is a schematic structural diagram of an MxN matrix switch provided by an embodiment of the present invention;

[0045] Figure 2 is a schematic internal principle structural diagram of an MxN matrix switch provided by an embodiment of the present invention;

[0046] Figure 3 is a schematic structural diagram of a reflective array optical switch provided by an embodiment of the present invention;

[0047] Figure 4 is a schematic structural diagram of a circulator provided by an embodiment of the present invention;

[0048] Figure 5It is a schematic diagram of the internal principle structure of a reflective array optical switch provided by an embodiment of the present invention;

[0049] Figure 6 It is a schematic diagram of the packaging structure of a reflective array optical switch provided by an embodiment of the present invention;

[0050] Figure 7 It is a schematic diagram of the structure of a monitoring light source component provided by an embodiment of the present invention;

[0051] Figure 8 It is a schematic diagram of the structure of a camera component provided by an embodiment of the present invention;

[0052] Figure 9 It is a schematic flowchart of an optical switching method of a reflective array optical switch provided by an embodiment of the present invention;

[0053] Figure 10 It is a schematic diagram of a dot matrix image on a light homogenizing plate in an initial state provided by an embodiment of the present invention;

[0054] Figure 11 It is a schematic diagram of the structure of a reflective array optical switch during optical path switching provided by an embodiment of the present invention;

[0055] Figure 12 It is a schematic diagram of the offset of the monitoring light on the light homogenizing plate during optical path switching provided by an embodiment of the present invention;

[0056] Figure 13 It is another schematic diagram of the offset of the monitoring light on the light homogenizing plate during optical path switching provided by an embodiment of the present invention;

[0057] Figure 14 It is a schematic diagram of a dot matrix image on a light homogenizing plate after optical path switching is completed provided by an embodiment of the present invention;

[0058] Figure 15 It is a schematic diagram of single-channel traversal calibration provided by an embodiment of the present invention;

[0059] Figure 16 It is another schematic diagram of single-channel traversal calibration provided by an embodiment of the present invention.

[0060] In all the drawings, the same reference numerals represent the same structure, where:

[0061] Collimator array 1, circulator 10, rotating mirror array 2, first reflector 3, second reflector 4, monitoring light source component 5, infrared light source 50, shaping lens 51, collimating lens 52, mask 53, camera component 6, light homogenizing plate 60, lens 61, infrared camera 62. Detailed implementation manners

[0062] In order to make the objectives, technical solutions, and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0063] Unless the context requires otherwise, throughout the specification and claims, the term "comprising" is to be construed in an open, inclusive sense, i.e., "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "examples", "specific examples", or "some examples", etc., are intended to indicate that a specific feature, structure, material, or characteristic related to the embodiment or example is included in at least one embodiment or example of the present disclosure. The schematic representations of the above terms do not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials, or characteristics may be included in any one or more embodiments or examples in any appropriate manner, that is, although they may be carried in the embodiments or examples of the above terms due to reasons such as the order and position of appearance, they are not limited to being carried in a combined manner by one embodiment or example.

[0064] In the description of the present invention, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present disclosure, unless otherwise specified, the meaning of "a plurality" is two or more. In addition, for example, in the description, for the same type of nouns, the method of adding "A" and "B" at the end is used to describe them as two independent individuals. In this case, the features defined with "A" and "B" are only used for the purpose of distinguishing the same type of individuals and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features.

[0065] When describing some embodiments, expressions such as "coupled", "coupled to", and "connected" and their derivatives may be used. For example, when describing some embodiments, the term "connected" may be used to indicate that two or more components have direct physical contact or electrical contact with each other. Another example is that when describing some embodiments, the term "coupled" may be used to indicate that two or more components have direct physical contact or electrical contact. However, the term "connected" or "coupled" may also mean that two or more components do not have direct contact with each other but still cooperate or interact with each other, such as "optical path coupling", "wireless connection", etc. The embodiments disclosed herein are not necessarily limited to the content of the present invention.

[0066] In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0067] Embodiment 1:

[0068] To solve the problems of complex optical path matching and large coupling difficulty in traditional MxN optical path switches, this embodiment provides a reflective array optical switch, as Figure 3 and Figure 5 shown, a collimator array 1, a rotating mirror array 2, and a first reflector 3 that are sequentially coupled along the optical path; the collimator array 1 includes a plurality of fiber ports, and a circulator 10 is provided at each fiber port; the input end of the circulator 10 is used to receive the signal light, and the isolation end of the circulator 10 is used to transmit the signal light to the rotating mirror array 2; the rotating mirror array 2 is used to reflect the signal light to the first reflector 3; wherein, by adjusting the rotation angle of the corresponding rotating mirror unit, channel switching can be achieved; the first reflector 3 is used to reflect the signal light to any one of the rotating mirror units in the rotating mirror array 2, and the corresponding rotating mirror unit reflects the signal light back to the isolation end of the corresponding circulator 10, and the signal light is output from the output end of the corresponding circulator 10.

[0069] Among them, as Figure 4 shown, the circulator 10 can guide the transmission direction of the optical signal according to a specific port order. When the signal light enters the input end of the circulator 10, it will be output from its isolation end according to the characteristics of the circulator 10, and then the signal light is transmitted to the rotating mirror array 2.

[0070] The rotating mirror array 2 is composed of a plurality of rotating mirror units. By precisely adjusting the rotation angle of the corresponding rotating mirror unit in the rotating mirror array 2, the reflection direction of the signal light can be changed. The signal light is reflected by the rotating mirror unit to the first reflector 3, and then the first reflector 3 reflects the signal light back to any one of the rotating mirror units in the rotating mirror array 2, and the rotating mirror unit with the adjusted rotation angle reflects the received signal light back to the isolation end of any circulator 10.

[0071] It should be noted here that the rotation angle range of each rotating mirror unit can satisfy that any one of the rotating mirror units can receive the reflected signal light. As for which rotating mirror unit receives the reflected signal light, it specifically depends on the rotation angle of the rotating mirror unit. For example, after setting the rotation angle of the rotating mirror unit A to θ, based on the principle of light reflection, only a certain rotating mirror unit (such as the rotating mirror B) will receive the reflected signal light; after setting the rotation angle of the rotating mirror unit A to β, based on the principle of light reflection, only a certain rotating mirror unit (such as the rotating mirror C) will receive the reflected signal light.

[0072] The first mirror 3 is used to reflect the signal light to any one of the mirror units in the mirror array 2. The phrase "any one of the mirror units" mainly aims to reflect the flexibility of the optical path selection. By controlling the rotation angles of different mirror units, the signal light can be reflected by the first mirror 3 to any one of the mirror units, and then the signal light is continuously reflected by the mirror unit to the isolation end of the corresponding circulator 10, realizing the switching of any channel. Then, the signal light is output from the output end of the corresponding circulator 10, thus completing the entire optical path switching process.

[0073] In the present invention, a collimator array 1, a mirror array 2, and a first mirror 3 are sequentially coupled, and a circulator 10 is provided at each optical fiber port of the collimator array 1. The signal light is received through the input end of the circulator 10, and the isolation end of the circulator 10 transmits the signal light to the mirror array 2. Then, by adjusting the rotation angle of the corresponding mirror unit in the mirror array 2, the signal light can be reflected onto the first mirror 3, and the first mirror 3 reflects the signal light back to any one of the mirror units in the mirror array 2. Then, the mirror unit reflects the signal light back to the isolation end of any one circulator 10 and outputs it from the output end of the corresponding circulator 10. By only using a set of collimator array 1 in cooperation with the mirror array 2 and the first mirror 3, the connection and switching of MxN optical paths of the same scale can be realized, greatly simplifying the optical path and improving the assembly efficiency.

[0074] At the same time, the circulator 10 in the collimator array 1 realizes the directional transmission and isolation of the signal light, reducing the mutual interference between different optical paths; the coupling method between the mirror array 2, the collimator array 1, and the first mirror 3 is based on the principle of light reflection. Compared with the complex optical path coupling methods in traditional optical path switches, this reflection-based coupling method is easier to implement and control, reducing the coupling difficulty.

[0075] To solve the problem that the method for monitoring the working state of each optical channel in the prior art is relatively complex, in one embodiment, as Figure 5 and Figure 6 shown, the reflective array optical switch further includes a second mirror 4, a monitoring light source assembly 5, and an imaging assembly 6; the second mirror 4 is coupled between the collimator array 1 and the mirror array 2. The second mirror 4 forms a first preset angle with the transmission direction of the signal light. Wherein, the range of the first preset angle is 40° to 50°.

[0076] In Figure 5 , the incident light refers to the transmission optical path of the signal light, the reflected light refers to the optical path of the optical signal reflected back by the first mirror 3, and the monitoring light refers to the transmission optical path of the monitoring light.

[0077] The monitoring light source assembly 5 is coupled to the second reflector 4; the rotating mirror array 2, the first reflector 3, and the imaging assembly 6 are coupled along the optical path in sequence; the monitoring light source assembly 5 is configured to emit monitoring light, and the monitoring light is incident on the second reflector 4 at a second preset angle; in one embodiment, the range of the second preset angle is 85° to 90°.

[0078] The second reflector 4 is configured to multiplex the signal light and the monitoring light into the same optical path to obtain coupled light, and transmit the coupled light to the rotating mirror array 2; the rotating mirror array 2 is configured to reflect the coupled light to the first reflector 3; the first reflector 3 is configured to transmit the monitoring light in the coupled light to the imaging assembly 6, and reflect the signal light in the coupled light to the rotating mirror array 2, and the imaging assembly 6 monitors the spot position of the monitoring light to feedback whether the rotation angle of the corresponding rotating mirror unit meets the channel switching requirement.

[0079] Wherein, the coupled light refers to the signal light and the monitoring light with different wavelengths being in the same optical path, approximately being a beam of coupled light.

[0080] In one embodiment, in order for the imaging assembly 6 to receive the monitoring light and quickly determine the rotating mirror unit that reflects back the signal light according to the position of the monitoring light in the imaging assembly 6, the imaging assembly 6 and the rotating mirror array 2 are in relative mirror image positions with respect to the reflecting surface of the first reflector 3.

[0081] In one embodiment, in order to couple the signal light and the monitoring light, the collimator array 1 and the monitoring light source assembly 5 are in relative mirror image positions with respect to the reflecting surface of the second reflector 4.

[0082] Wherein, the second reflector 4 can transmit the signal light, and at the same time, when the monitoring light from the monitoring light source assembly 5 is incident on the reflecting surface of the second reflector 4 at the second preset angle, the monitoring light and the signal light are coupled into a beam of coupled light. In one embodiment, the wavelength range of the signal light is set to 1250 nm to 1650 nm, and the wavelength range of the monitoring light is set to 850 nm to 980 nm. In this way, there will be no band crosstalk during the coupling of the monitoring light and the signal light.

[0083] After the coupling light is reflected to the rotating mirror array 2, by controlling the rotation angle of the corresponding rotating mirror unit, the coupling light can be reflected to the reflection surface of the first reflector 3. Based on the optical characteristics of the first reflector 3, the monitoring light in the coupling light is transmitted to the camera assembly 6 by the first reflector 3, and the camera assembly 6 is used to determine whether there is an error in the optical path transmission of the current channel, which is used to analyze the working state of the current optical channel. Correspondingly, the first reflector 3 will also reflect the signal light in the coupling light back to the corresponding rotating mirror unit in the rotating mirror array 2, and by adjusting the rotation angle of the corresponding rotating mirror unit, the initial signal light is reflected back to the corresponding circulator 10 and output, thereby realizing the switching and conducting of the optical path and the monitoring function of the optical path at the same time.

[0084] In summary, this embodiment cleverly utilizes the monitoring light source assembly 5, the second reflector 4, the first reflector 3 and the camera assembly 6, respectively, through the optical characteristics of the two reflectors, so that the camera assembly 6 only receives the monitoring light to analyze the state of the corresponding optical channel, and will not affect the normal optical path switching. This embodiment integrates the monitoring process into the optical path system of the optical switch, without the need for additional complex detection equipment and cumbersome optical path connections, greatly simplifying the monitoring method for the working state of each optical channel.

[0085] In order to obtain the monitoring light, in one embodiment, Figure 7 As shown, the monitoring light source assembly 5 includes an infrared light source 50, a shaping lens 51, a collimating lens 52 and a mask 53 coupled in sequence along the optical path; the infrared light source 50 is used to emit infrared light, the shaping lens 51 is used to expand and correct the infrared light, the collimating lens 52 is used to collimate the expanded and corrected infrared light, and the mask 53 is used to convert the collimated infrared light into multi-channel mutually parallel monitoring light, and transmit the monitoring light to the reflecting surface of the second reflector 4.

[0086] Among them, in the monitoring light source assembly 5, the infrared light source 50 outputs monitoring light with a certain power, and the wavelength is usually 850 nm to 980 nm, so as not to generate crosstalk with the 1250 nm to 1650 nm band of the signal light in the collimator array 1. The monitoring light is expanded by the shaping lens 51 and the light spot is corrected to be close to a standard circular light spot, and then is converted into a large-area parallel light beam after passing through the collimating lens 52. In one embodiment, the mask 53 is a diaphragm with holes on its surface, and the mask 53 and the collimator array 1 are in a relative mirror image position with respect to the reflecting surface of the second mirror 4; the aperture of each through hole in the mask 53 is smaller than the diameter of each mirror unit in the rotating mirror array 2, and the distance between each through hole in the mask 53 matches the distance between each channel in the collimator array 1. Among them, the matching can be equal or basically equal, and the two are within the allowable error range of the distance error.

[0087] Among them, the fact that the distance between each through hole in the mask 53 matches the distance between each channel in the collimator array 1 means that the distance between each through hole in the mask 53 is equal to the distance between each channel in the collimator array 1. At this time, after the parallel light converted by the collimating lens 52 passes through the mask 53, monitoring light with N channels parallel to each other and a light spot size smaller than the diameter of a single mirror unit will be formed.

[0088] In one embodiment, referring to Figure 5 , the collimator array 1 receives and transmits the signal light, and usually enters the rotating mirror array 2 at a certain incident angle. The range of the incident angle is usually 15° to 30°. The transmission direction of the signal light and the transmission direction of the monitoring light emitted from the mask 53 are set to form an angle of 90° (the second preset angle). A second mirror 4 that forms an angle of 45° (the first preset angle) with the signal light is placed at its center position, and the signal light and the monitoring light can be multiplexed into the same optical path.

[0089] In order to be able to monitor the insertion loss of the corresponding optical channel, in one embodiment, as Figure 8 shown, the camera assembly 6 includes a light homogenizing sheet 60, a lens 61 and an infrared camera 62; the reflective array optical switch further includes a control unit (not shown in the figure); the control unit is connected to the signal terminal of the infrared camera 62 and the control terminal of the rotating mirror array 2; the lens 61 and the infrared camera 62 are used to obtain the dot matrix image formed by the monitoring light on the light homogenizing sheet 60; the control unit is used to determine the abnormal points that are offset on the light homogenizing sheet 60 according to the dot matrix image, and adjust the rotation angle of the mirror unit corresponding to the abnormal points.

[0090] Among them, the camera assembly 6 further includes a protective housing 63, and the lens 61 and the infrared camera 62 are both disposed in the protective housing 63.

[0091] In one embodiment, in order to enable the monitoring light transmitted by the first mirror 3 to be transmitted to the light homogenizing plate 60, in one embodiment, the light homogenizing plate 60 and the rotating mirror array 2 are in a relative mirror image position with respect to the reflecting surface of the first mirror 3.

[0092] In one embodiment, converging light spots distributed in an array may further be provided on the light homogenizing plate 60. The distribution pattern of the converging light spots matches the distribution pattern of the rotating mirror units on the rotating mirror array 2, so that one converging light spot and one rotating mirror unit are in a relative mirror image with respect to the reflecting surface of the first mirror 3. By detecting the spot position of the monitoring light, the rotating mirror unit that receives the reflected signal light can be quickly determined, achieving the purpose of channel monitoring.

[0093] It should be noted that, for the sake of convenience of description, in one embodiment, the converging light spot on the light homogenizing plate 60 is the incident position of one light spot, that is, after the monitoring light passes through the first mirror 3 and is incident on the corresponding converging light spot, a light spot will be formed at the corresponding position on the light homogenizing plate 60 (i.e., the aforementioned corresponding converging light spot). After all the monitoring lights corresponding to all channels are incident on the corresponding converging light spots, a dot matrix image is formed on the light homogenizing plate 60, and then the lens 61 and the infrared camera 62 collect and analyze the corresponding dot matrix image. The lens 61 is responsible for clearly focusing the dot matrix image on the light homogenizing plate 60 onto the photosensitive element of the infrared camera 62, and the infrared camera 62 converts the optical signal into an electrical signal, realizing the capture and recording of the imaging of the monitoring light for subsequent analysis and processing. For the control unit, on the one hand, it obtains the dot matrix image on the light homogenizing plate 60 from the infrared camera 62; on the other hand, according to the received dot matrix image, it sends an instruction to the control end of the rotating mirror array 2, thereby adjusting the rotation angle of the corresponding rotating mirror unit.

[0094] The control unit can identify whether there are abnormal points on the light homogenizing plate 60 and the positions and characteristics of the abnormal points. Here, the abnormal points usually refer to the situation where when the optical path is switched, the monitoring light is offset and not in the ideal position corresponding to the current channel. Once the control unit determines the rotating mirror unit corresponding to the abnormal point, it will adjust the rotation angle of the corresponding rotating mirror unit according to the specific situation, so as to restore the optical path to the ideal state, thereby reducing the insertion loss of the optical path. Insertion loss refers to the energy loss of the optical signal during the optical path transmission process. By adjusting the rotation angle of the rotating mirror unit, the optical path can be optimized, reducing the optical energy loss caused by reasons such as optical path deviation, and improving the transmission quality of the optical signal.

[0095] Embodiment 2:

[0096] To further illustrate the reflective array optical switch proposed in Embodiment 1, in this embodiment, an optical switching method for a reflective array optical switch is proposed, as Figure 9 shown, including:

[0097] Step 101: The input end of the circulator 10 receives the signal light, and the isolation end of the circulator 10 transmits the signal light to the rotating mirror array 2.

[0098] Among them, the circulator 10 can guide the transmission direction of the optical signal according to a specific port order. When the signal light enters the input end of the circulator 10, it will output from its isolation end according to the characteristics of the circulator 10, and then transmit the signal light to the rotating mirror array 2.

[0099] Step 102: The rotating mirror array 2 receives the channel switching signal, determines the rotating mirror unit that needs to adjust the rotation angle according to the channel switching signal, and adjusts the rotation angle of the corresponding rotating mirror unit to reflect the signal light to the first reflecting mirror 3.

[0100] The rotating mirror array 2 is composed of multiple rotating mirror units. By precisely adjusting the rotation angle of the corresponding rotating mirror unit in the rotating mirror array 2, the reflection direction of the signal light can be changed. The signal light is reflected by the rotating mirror unit to the first reflecting mirror 3.

[0101] Step 103: The first reflecting mirror 3 reflects the signal light to any one of the rotating mirror units in the rotating mirror array 2, and the corresponding rotating mirror unit reflects the signal light back to the isolation end of the corresponding circulator 10, and outputs the signal light from the output end of the corresponding circulator 10.

[0102] Among them, the first reflecting mirror 3 reflects the signal light back to any one of the rotating mirror units in the rotating mirror array 2, and the rotating mirror unit with the adjusted rotation angle reflects the received signal light back to the isolation end of any circulator 10. The "any" here reflects the flexibility of the optical path selection. By controlling the rotation angles of different rotating mirror units, the signal light can be reflected to the isolation ends of different circulators 10. Then, the signal light is output from the output end of the corresponding circulator 10, thus completing the entire optical path switching process.

[0103] In one embodiment, the optical switching method of the reflective array optical switch further includes: monitoring the monitoring light emitted by the light source component 5, and the second mirror 4 multiplexes the signal light and the monitoring light into the same optical path to obtain coupled light, and transmits the coupled light to the rotating mirror array 2; the rotating mirror array 2 transmits the coupled light to the first mirror 3; the first mirror 3 transmits the monitoring light in the coupled light to the imaging component 6, and reflects the signal light in the coupled light to the rotating mirror array 2; the imaging component 6 monitors the spot position of the monitoring light, and adjusts the rotation angle of the corresponding rotating mirror unit according to the spot position until the channel switching requirement is met.

[0104] Wherein, the second mirror 4 can transmit the signal light. At the same time, when the monitoring light from the monitoring light source component 5 is incident on the reflecting surface of the second mirror 4 at the second preset angle, the monitoring light and the signal light are coupled into a beam of coupled light. In one embodiment, the wavelength range of the signal light is set to 1250 nm to 1650 nm, and the wavelength range of the monitoring light is set to 850 nm to 980 nm. In this way, there will be no band crosstalk during the coupling of the monitoring light and the signal light.

[0105] After the coupled light is reflected to the rotating mirror array 2, by controlling the rotation angle of the corresponding rotating mirror unit, the coupled light can be reflected to the reflecting surface of the first mirror 3. Based on the optical characteristics of the first mirror 3, the monitoring light in the coupled light is transmitted by the first mirror 3 to the imaging component 6, and the imaging component 6 determines whether there is an error in the optical path transmission of the current channel, which is used to analyze the working state of the current optical channel. Correspondingly, the first mirror 3 will also reflect the signal light in the coupled light back to the rotating mirror unit in the corresponding rotating mirror array 2, and by adjusting the rotation angle of the corresponding rotating mirror unit, the initial signal light is reflected back to the corresponding circulator 10 and output, so as to simultaneously realize the switching and conduction of the optical path and the monitoring function of the optical path.

[0106] In one embodiment, the optical switching method of the reflective array optical switch further includes: the lens 61 and the infrared camera 62 acquire the dot matrix image formed by the monitoring light on the light homogenizing plate 60; the control unit determines the abnormal points that are offset according to the dot matrix image on the light homogenizing plate 60, and adjusts the rotation angle of the rotating mirror unit corresponding to the abnormal points to reduce the insertion loss of the optical path.

[0107] In one embodiment, the channel switching signal is: the first signal light emitted by the first channel is switched to be received by the second channel, and the second signal light emitted by the second channel is switched to be received by the first channel; wherein, the first channel corresponds to the first rotating mirror unit, and the second channel corresponds to the second rotating mirror unit. Wherein, as Figure 10 andFigure 11 As shown, when the first channel refers to channels 1, 1', and the second channel refers to channels x, x', the first mirror unit is the No. 1 mirror unit on the mirror array 2, and the second mirror unit is the No. x mirror unit on the mirror array 2.

[0108] The imaging component 6 monitors the spot position of the monitoring light, and adjusts the rotation angle of the corresponding mirror unit according to the spot position until the channel switching requirement is met, including: obtaining a reference dot matrix image of the monitoring light of all channels in the initial channel state on the light homogenizing plate 60 (as Figure 10 shown), where the reference dot matrix image is composed of converging light spots distributed in an array, and one converging light spot and one mirror unit are in relative mirror image with respect to the reflecting surface of the first reflector 3; the imaging component 6 monitors the first spot position of the first monitoring light on the light homogenizing plate 60, and monitors the second spot position of the second monitoring light on the light homogenizing plate 60, where the first monitoring light is the monitoring light corresponding to the first signal light, and the second monitoring light is the monitoring light corresponding to the second signal light; taking the reference dot matrix image as a reference, when it is detected that the first spot position coincides with the converging light spot corresponding to the second mirror unit, and the second spot position coincides with the converging light spot corresponding to the first mirror unit, the rotation angles of the second mirror unit and the first mirror unit both meet the channel switching requirements.

[0109] In other embodiments, converging light spots can also be arranged in an array on the light homogenizing plate 60, and the distribution mode of the converging light spots matches the distribution mode of the mirror units on the mirror array 2, so that one converging light spot and one mirror unit are in relative mirror image with respect to the reflecting surface of the first reflector 3. By detecting the spot position of the monitoring light, the mirror unit that receives the signal light reflected back can be quickly determined, and the purpose of channel monitoring can be achieved. In one embodiment, the imaging component 6 monitors the first spot position of the first monitoring light on the light homogenizing plate 60 (such as *1 on the light homogenizing plate 60, that is, the aforementioned converging light spot), and monitors the second spot position of the second monitoring light on the light homogenizing plate 60 (such as *x on the light homogenizing plate 60, that is, the aforementioned converging light spot), where the first monitoring light is the monitoring light corresponding to the first signal light, and the second monitoring light is the monitoring light corresponding to the second signal light; where, referring to Figure 10 and Figure 11 , the light homogenizing plate 60 is provided with converging light spots distributed in an array, and one converging light spot and one mirror unit are in relative mirror image with respect to the reflecting surface of the first reflector 3; when it is detected that the first spot position coincides with the converging light spot corresponding to the second mirror unit, and the second spot position coincides with the converging light spot corresponding to the first mirror unit, the rotation angles of the second mirror unit and the first mirror unit both meet the channel switching requirements.

[0110] The following will take the first channel as channel 1, 1' and the second channel as channel x, x' as an example for illustration. Figure 5 and Figure 11 For the real-time monitoring of optical channels, in one embodiment, referring to

[0111] , for example, channel 1, 1' is self-reflectively connected (where 1 corresponds to the input end of the circulator, and 1' corresponds to the output end of the circulator, that is, the signal light is input from channel 1 and output from channel 1'). After the signal light is reflected by the mirror array 2 and then reflected by the first mirror 3, it is reflected to the No. 1 mirror unit in the mirror array 2, and then re-reflected back to channel 1, 1'. The input and output are isolated and distinguished by the circulator 10. At the same time, the monitoring light corresponding to channel 1, 1' is reflected by the mirror array 2 and then transmitted through the first mirror 3, and forms an image at point *1 on the light homogenizing plate 60. As Figure 5 shown, when all channels are working, the dot matrix images formed by the monitoring lights corresponding to all channels on the light homogenizing plate 60 can be collected through the lens 61 and the infrared camera 62. Figure 10 When optical channel switching is required, as in the working state shown in

[0112] , for example, when channel 1, 1' needs to establish a connection with channel x, x', by respectively adjusting the corresponding No. 1 mirror unit and No. x mirror unit in the mirror array 2, the monitoring light corresponding to channel 1, 1' is transmitted to point *x, and the monitoring light corresponding to channel x, x' is transmitted to point *1. Figure 11 At this time, the signal light of channel 1, 1' is reflected by the first mirror 3 to the corresponding No. x mirror unit in the mirror array 2. At this time, the signal light of channel x, x' is reflected by the first mirror 3 to the corresponding No. 1 mirror unit in the mirror array 2, thereby establishing the optical path connection between channel 1, 1' and channel x, x'. After all channels are working, the dot matrix images formed by the corresponding monitoring lights on the light homogenizing plate 60 can be collected through the lens 61 and the infrared camera 62, and the rotation angle of the mirror unit corresponding to the abnormal point offset in the dot matrix image is adjusted to reduce the insertion loss of the optical path.

[0113] In one embodiment, as shown in

[0114] , still taking the example that channel 1, 1' needs to establish a connection with channel x, x' as an example, referring to Figure 11 , Figure 10, first record the dot matrix image of the spot corresponding to the monitoring light on the homogenizing sheet 60 in the initial state of the entire system. Through centroid calculation, determine the coordinate origin corresponding to all channel positions, where there are 8X8 channels. When channel switching connection is required, for example, if the spot position of the monitoring light corresponding to channels 1, 1' is A1, and the spot position of the monitoring light corresponding to channels x, x' is B3, then a channel switch of A1 - B3 needs to be established.

[0115] By adjusting the rotation angles of the 1st mirror unit corresponding to channels 1, 1' in the mirror array 2 respectively, and the rotation angle of the xth mirror unit corresponding to channels x, x'. As Figure 12 shown, the spot corresponding to the original A1 point position will move towards the B3 point, and the spot at the original B3 position will move towards the A1 point.

[0116] As Figure 13 shown, if the centroids of the spots corresponding to the two moved points do not coincide with the original centroid position of the target point, then continue to finely adjust the rotation angle of the corresponding mirror unit until the centroid coordinates are in place. As Figure 14 shown, when the centroid position completely coincides with the original position (i.e., at this time, the point on coordinate A1 is the spot of the monitoring light corresponding to channels x, x', and the point on coordinate B3 is the spot of the monitoring light corresponding to channels 1, 1'), after the centroids of all the spots of the monitoring light coincide with the initial coordinates, it can be confirmed that all connection channels are in the minimum insertion loss state.

[0117] In one embodiment, when the reflective array optical switch performs multi-channel optical path switching, adjusting the mirror unit only according to the spot position on the homogenizing sheet 60 may cause confusion. To solve the above problem, in one embodiment, as Figure 15 and Figure 16 shown, during the initial calibration of the device, it is necessary to traverse the rotation angle of each channel. For example, referring to Figure 15 and Figure 16 , when traversing the A1 channel, by adjusting the mirror unit corresponding to the A1 channel, successively calibrate the rotation angle θ X &θ Y when the spot is successively irradiated on the origin of units A1 to H8, and generate a corresponding channel rotation angle coefficient table as Figure 16 shown.

[0118] When channel switching connection is required, for example, to establish an A1 - B3 channel, by adjusting the rotation angle of the corresponding mirror unit in the mirror array 2, the mirror unit corresponding to the A1 channel rotates by θ X(A1-B3) &θY (A1-B3) , and the mirror unit corresponding to the B3 channel rotates by θ X(B3-A1) &θ Y(B3-A1) , at this time, as Figure 12 , Figure 13 and Figure 14As shown in the figure, the light spot corresponding to the original A1 position will move to B3, and the light spot at the original B3 position will move to A1. If the centroid of the light spot after movement does not coincide with the original centroid position of the target point, the rotating mirror array will be continuously fine-tuned until the centroid coordinates are in place. When the centroid positions completely coincide, and when the centroids of all monitored light spots coincide with the initial coordinates, it can be confirmed that all connection channels are in the state of minimum insertion loss.

[0119] By calibrating all channels to obtain a preset angle, and controlling the corresponding rotating mirror unit to rotate by the corresponding preset angle when switching the optical path, it is possible to avoid the problem that when the reflective array optical switch performs multi-channel switching, the light spots of each channel are confused, resulting in the optical path not being switched in time or being switched to the wrong channel.

[0120] The present invention is provided with a collimator array 1, a rotating mirror array 2, and a first reflector 3 that are coupled in sequence. A circulator 10 is provided at each optical fiber port of the collimator array 1. The signal light is received through the input end of the circulator 10, and the isolation end of the circulator 10 transmits the signal light to the rotating mirror array 2. Then, by adjusting the rotation angle of the corresponding rotating mirror unit in the rotating mirror array 2, the signal light can be reflected onto the first reflector 3. The first reflector 3 reflects the signal light back to any rotating mirror unit in the rotating mirror array 2, and then the rotating mirror unit reflects the signal light back to the isolation end of any circulator 10 and outputs it from the output end of the corresponding circulator 10. By only using a set of collimator array 1 in cooperation with the rotating mirror array 2 and the first reflector 3, the connection and switching of the MxN optical path of the same scale can be realized, greatly simplifying the optical path and improving the assembly efficiency.

[0121] At the same time, the circulator 10 in the collimator array 1 realizes the directional transmission and isolation of the signal light, reducing the mutual interference between different optical paths; the coupling method between the rotating mirror array 2, the collimator array 1, and the first reflector 3 is based on the principle of light reflection. Compared with the complex optical path coupling methods in traditional optical path switches, this reflection-based coupling method is easier to implement and control, reducing the coupling difficulty.

[0122] Regarding the structure of the reflective array optical switch, refer to Embodiment 1, which will not be elaborated in this embodiment.

[0123] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A reflective array optical switch, characterized in that: include: A collimator array (1), a rotating mirror array (2) and a first reflector (3) are sequentially coupled along an optical path; the collimator array (1) comprises a plurality of optical fiber ports, and a circulator (10) is provided at each optical fiber port; The input end of the circulator (10) is used to receive signal light, and the isolation end of the circulator (10) is used to transmit the signal light to the rotating mirror array (2); The rotating mirror array (2) is used to reflect the signal light to the first reflector (3); wherein the rotation angle of the corresponding rotating mirror unit is adjusted to achieve channel switching; The first reflector (3) is used to reflect the signal light to any one of the rotating mirror units in the rotating mirror array (2), and the corresponding rotating mirror unit reflects the signal light back to the isolation end of the corresponding circulator (10), and outputs the signal light from the output end of the corresponding circulator (10).

2. The reflective array optical switch according to claim 1, characterized in that: It also includes a second reflector (4), a monitoring light source assembly (5) and a camera assembly (6); The second reflector (4) is coupled between the collimator array (1) and the rotating mirror array (2); the monitoring light source assembly (5) is coupled to the second reflector (4); the rotating mirror array (2), the first reflector (3) and the camera assembly (6) are coupled in sequence along the optical path; The monitoring light source assembly (5) is used to emit monitoring light, and the monitoring light is incident on the second reflector (4); The second reflector (4) is used to combine the signal light and the monitoring light into the same optical path to obtain coupled light, and transmit the coupled light to the rotating mirror array (2); The rotating mirror array (2) is used to reflect the coupled light to the first reflector (3); The first reflector (3) is used to transmit the monitoring light in the coupled light to the camera assembly (6), and to reflect the signal light in the coupled light to the rotating mirror array (2), and the camera assembly (6) monitors the spot position of the monitoring light to provide feedback on whether the rotation angle of the corresponding rotating mirror unit meets the channel switching requirements.

3. The reflective array optical switch according to claim 2, characterized in that: The camera assembly (6) and the rotating mirror array (2) are located at relative mirror positions on the reflection surface of the first reflection mirror (3).

4. The reflective array optical switch according to claim 2, characterized in that: The collimator array (1) and the monitoring light source assembly (5) are located at relative mirror positions on the reflection surface of the second reflector (4).

5. The reflective array optical switch according to claim 2, characterized in that: The monitoring light source assembly (5) comprises an infrared light source (50), a shaping lens (51), a collimating lens (52) and a mask (53) which are sequentially coupled along an optical path; The infrared light source (50) is used to emit infrared light, the shaping lens (51) is used to expand and correct the infrared light, the collimating lens (52) is used to collimate the expanded and corrected infrared light, and the mask (53) is used to convert the collimated infrared light into multi-channel mutually parallel monitoring light, and transmit the monitoring light to the reflection surface of the second reflector (4).

6. The reflective array optical switch according to claim 5, characterized in that: The aperture of each through hole in the mask (53) is smaller than the diameter of each rotating mirror unit in the rotating mirror array (2), and the spacing between each through hole in the mask (53) matches the spacing between each channel in the collimator array (1).

7. The reflective array optical switch according to claim 2, wherein: The camera assembly (6) comprises a light homogenizer (60), a lens (61) and an infrared camera (62); The reflective array optical switch further comprises a control unit; the control unit is connected to a signal end of the infrared camera (62) and a control end of the rotating mirror array (2); The lens (61) and the infrared camera (62) are used to obtain a dot matrix image formed by the monitoring light on the light homogenizing sheet (60); The control unit is used to determine the abnormal point on the light homogenizing sheet (60) where the deviation occurs according to the dot matrix image, and to adjust the rotation angle of the rotating mirror unit corresponding to the abnormal point.

8. An optical switching method for a reflective array optical switch, characterized in that: The optical switching method is implemented in the reflective array optical switch according to any one of claims 1 to 7, comprising: The input end of the circulator (10) receives signal light, and the isolation end of the circulator (10) transmits the signal light to the rotating mirror array (2); The rotating mirror array (2) receives a channel switching signal, determines a rotating mirror unit that needs to be adjusted in angle according to the channel switching signal, and adjusts the angle of the corresponding rotating mirror unit to reflect the signal light to the first reflector (3); The first reflector (3) reflects the signal light to any one of the rotating mirror units in the rotating mirror array (2), and the corresponding rotating mirror unit reflects the signal light back to the isolation end of the corresponding circulator (10), and outputs the signal light from the output end of the corresponding circulator (10).

9. The optical switching method of the reflective array optical switch according to claim 8, characterized in that: The method further comprises: The monitoring light source assembly (5) emits monitoring light, and the second reflector (4) combines the signal light and the monitoring light into the same optical path to obtain coupled light, and transmits the coupled light to the rotating mirror array (2); The rotating mirror array (2) transmits the coupled light to the first reflecting mirror (3); The first reflector (3) transmits the monitoring light in the coupled light to the camera assembly (6), and reflects the signal light in the coupled light to the rotating mirror array (2); The camera assembly (6) monitors the spot position of the monitoring light, and adjusts the rotation angle of the corresponding rotating mirror unit according to the spot position until the channel switching requirement is met.

10. The optical switching method of the reflective array optical switch according to claim 9, characterized in that: The channel switching signal is: the first signal light emitted by the first channel is switched to be received by the second channel, and the second signal light emitted by the second channel is switched to be received by the first channel; wherein the first channel corresponds to the first rotating mirror unit, and the second channel corresponds to the second rotating mirror unit; The camera assembly (6) monitors the spot position of the monitoring light, and adjusts the rotation angle of the corresponding rotating mirror unit according to the spot position until the channel switching requirement is met, including: Acquiring a reference dot matrix image of monitoring light of all channels on the light homogenizer (60) in an initial channel state, wherein the reference dot matrix image is composed of convergent light spots distributed in an array, and a convergent light spot and a rotating mirror unit are mirror images relative to the reflection surface of the first reflector (3); The camera assembly (6) monitors a first light spot position of a first monitoring light on the light homogenizer (60), and monitors a second light spot position of a second monitoring light on the light homogenizer (60), wherein the first monitoring light is monitoring light corresponding to the first signal light, and the second monitoring light is monitoring light corresponding to the second signal light; Taking the reference dot matrix image as a reference, when it is detected that the first light spot position coincides with the convergent light spot corresponding to the second rotating mirror unit, and the second light spot position coincides with the convergent light spot corresponding to the first rotating mirror unit, the rotation angles of the second rotating mirror unit and the first rotating mirror unit have met the channel switching requirements.

Images