CN111399122A - Free space light beam receiving and transmitting telescopic system - Google Patents
Free space light beam receiving and transmitting telescopic system Download PDFInfo
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- CN111399122A CN111399122A CN202010491898.2A CN202010491898A CN111399122A CN 111399122 A CN111399122 A CN 111399122A CN 202010491898 A CN202010491898 A CN 202010491898A CN 111399122 A CN111399122 A CN 111399122A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/262—Optical details of coupling light into, or out of, or between fibre ends, e.g. special fibre end shapes or associated optical elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/264—Optical coupling means with optical elements between opposed fibre ends which perform a function other than beam splitting
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/40—Transceivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/70—Photonic quantum communication
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Abstract
The application provides a free space light beam receiving and transmitting telescopic system, which relates to the technical field of quantum communication, and comprises a receiver and a transmitter; the receiver comprises a beam-shrinking module and a receiver optical fiber coupler, and the transmitter comprises a beam-expanding module and a transmitter optical fiber collimator; the beam-shrinking module comprises a first-stage shrinking unit and a second-stage shrinking unit, and the shrinking multiple of the first-stage shrinking unit is greater than that of the second-stage shrinking unit; the beam expanding module comprises a first-stage beam expanding unit and a second-stage beam expanding unit, and the beam expanding multiple of the first-stage beam expanding unit is smaller than that of the second-stage beam expanding unit. The technical scheme provided by the application can realize the direct coupling connection of the light beam receiving and transmitting telescopic system and the existing optical fiber system.
Description
Technical Field
The application relates to the technical field of quantum communication, in particular to a free space light beam receiving and transmitting telescopic system.
Background
Quantum communication technologies are classified into optical fiber quantum communication and free space quantum communication due to differences in transmission channels. The precondition for building the optical fiber quantum communication system at present is that an optical fiber link needs to be built, global development of the quantum communication system is limited, communication requirements of mobile end users cannot be met, the building of the communication link cannot be completed quickly, the quantum communication system based on the optical fiber faces a development bottleneck, and advantages of flexibility and changeability of free space quantum communication, dynamic networking and the like are considered to be a better choice for realizing a global quantum communication network.
The design of a light beam receiving and transmitting telescoping system is one of key designs for realizing free space quantum communication, in the prior art, an Avalanche Photodiode (APD) is directly connected behind the light beam receiving and transmitting telescoping system to detect optical signals, and decoding and modulation of the optical signals are concentrated in the light beam receiving and transmitting telescoping system, so that the light beam receiving and transmitting telescoping system has a complex structure and a low system code rate; if the optical fiber system can be directly connected after the light beam receiving and transmitting telescopic system is connected, and the existing mature optical fiber Quantum Key Distribution (QKD) equipment is connected in a single-mode optical fiber coupling mode, the functions of quantum decoding, modulation and the like can be concentrated in the optical fiber system, the existing light beam receiving and transmitting telescopic system is simplified, the working stability of the system is improved, and the code forming rate of free space quantum key distribution can be greatly improved.
In addition, the existing beam receiving and transmitting telescoping system is basically a primary telescoping system, namely a primary beam expanding and beam contracting system, and the system has strict limitation on system element parameters when the same beam expanding and beam contracting multiple is completed, the structural design is relatively complex, and the tolerance performance of the system is low.
Disclosure of Invention
The application provides a free space light beam receiving and transmitting telescopic system to solve the problem that the light beam receiving and transmitting telescopic system is directly connected and coupled with an existing optical fiber system.
A free space light beam receiving and transmitting telescopic system comprises a receiver and a transmitter; the receiver comprises a beam-shrinking module and a receiver optical fiber coupler, and the transmitter comprises a beam-expanding module and a transmitter optical fiber collimator; the beam shrinking module comprises a first-stage shrinking unit and a second-stage shrinking unit, a first quadric surface plano-convex reflector, a first quadric surface plano-concave reflector and a first eyepiece group are sequentially arranged and coaxially arranged at the center to form the first-stage shrinking unit, a first plano-convex lens and a first biconcave lens are sequentially arranged and coaxially arranged at the center to form the second-stage shrinking unit, the shrinking multiple of the first-stage shrinking unit is greater than that of the second-stage shrinking unit, the first-stage shrinking unit, the second-stage shrinking unit and the receiver optical fiber coupler are sequentially arranged on the same optical path, and the receiver optical fiber coupler is connected with a single-mode optical fiber; the light beam expanding module comprises a first-stage beam expanding unit and a second-stage beam expanding unit, wherein a second biconcave lens and a second biconcave lens are sequentially arranged and coaxially arranged at the center to form the first-stage beam expanding unit, a second eyepiece group, a second quadric plano-concave reflector and a second quadric plano-convex reflector are sequentially arranged and coaxially arranged at the center to form the second-stage beam expanding unit, the beam expanding multiple of the first-stage beam expanding unit is smaller than that of the second-stage beam expanding unit, the transmitter optical fiber collimator, the first-stage beam expanding unit and the second-stage beam expanding unit are sequentially arranged on the same optical path, and the transmitter optical fiber collimator is connected with a single-mode optical fiber.
Preferably, the beam contracting module further comprises a first deflecting reflector, a first plane reflection vibration mirror, a first dichroic beam splitter and a narrow-band optical filter, which are sequentially arranged, wherein the first deflecting reflector is arranged at the rear end of the first-stage beam contracting unit, and the narrow-band optical filter is arranged at the front end of the second-stage beam contracting unit.
Preferably, the light beam expanding module further includes a second dichroic beam splitter, a second plane mirror, and a second turning mirror, which are sequentially disposed, the second dichroic beam splitter is disposed at the rear end of the first stage beam expanding unit, and the second turning mirror is disposed at the front end of the second stage beam expanding unit.
Preferably, a first hole is formed in the central axis of the first quadric plano-concave reflecting mirror in a penetrating manner, the first eyepiece group is disposed in the first hole and comprises a first single lens and a first double lens, the first single lens is a plano-concave lens, and the first double lens is a double cemented lens.
Preferably, the receiver fiber coupler is disposed behind the first biconcave lens, the first plano-convex lens, the first biconcave lens, and the receiver fiber coupler are arranged in sequence, and the communication light transmitted through the first biconcave lens enters the receiver fiber coupler.
Preferably, the first quadric plano-concave mirror comprises a plane and a concave surface which are opposite, the first quadric plano-convex mirror comprises a plane and a convex surface which are opposite, the concave surface of the first quadric plano-concave mirror faces the convex surface of the first quadric plano-convex mirror, and the convex surface of the first quadric plano-convex mirror faces the first single lens.
Preferably, a second hole is formed in the central axis of the second quadric plano-concave reflecting mirror in a penetrating manner, the second eyepiece group is disposed in the second hole and comprises a second single lens and a second double lens, the second single lens is a plano-concave lens, and the second double lens is a double cemented lens.
Preferably, the transmitter optical fiber collimator is disposed in front of the second double concave lens, the transmitter optical fiber collimator, the second double concave lens, and the second plano-convex lens are sequentially arranged, and communication light enters the second double concave lens after passing through the transmitter optical fiber collimator.
Preferably, the second quadric plano-convex reflector comprises opposite flat surfaces and convex surfaces, the second quadric plano-concave reflector comprises opposite flat surfaces and concave surfaces, the convex surface of the second quadric plano-convex reflector faces the concave surface of the second quadric plano-concave reflector, and the convex surface of the second quadric plano-convex reflector faces the second single lens.
Preferably, the first plano-convex lens comprises opposing flat and convex surfaces, the convex surface of the first plano-convex lens facing the narrow band filter.
According to the technical scheme, the novel free space beam receiving and transmitting telescopic system is provided, and coupling of a large-aperture space beam to a single-mode fiber and transmission of the single-mode fiber to the large-aperture space beam can be achieved by arranging the beam contracting module of the receiver and the optical fiber coupler of the receiver, and the beam expanding module of the transmitter and the optical fiber collimator of the transmitter. The system adopts two-stage beam shrinkage and two-stage beam expansion, compared with a one-stage beam shrinkage and beam expansion system, the system can break through strict limitation on system element parameters to reduce the design difficulty of space optics, and simultaneously improves tolerance performance and system stability.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a free space beam receiving and transmitting telescopic system according to the present application;
FIG. 2 is a schematic diagram of a beam-shrinking module and a receiver fiber coupler according to the present application;
FIG. 3 is a schematic view of the first folding mirror and the first plane mirror with another view angle;
fig. 4 is a schematic diagram of a beam expanding module and a transmitter optical fiber collimator according to the present application.
Detailed Description
The technical solutions of the present invention will be described in detail with reference to the accompanying drawings and specific embodiments, it should be understood that these embodiments are merely illustrative of the present invention and are not intended to limit the scope of the present invention, and various equivalent modifications of the present invention by those skilled in the art after reading the present invention fall within the scope of the appended claims.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The invention provides a free space light beam receiving and transmitting telescopic system which can realize the coupling of a large-caliber space light beam to a single-mode optical fiber and the emission of the single-mode optical fiber to the large-caliber space light beam, namely, the problem that the light beam receiving and transmitting telescopic system is directly connected and coupled with the conventional optical fiber system is solved.
Referring to fig. 1, a free-space optical beam transceiver telescopic system provided in the present embodiment includes a receiver and a transmitter; the receiver comprises a beam-shrinking module and a receiver optical fiber coupler, wherein the beam-shrinking module and the receiver optical fiber coupler are sequentially arranged and aligned on an optical path, namely, an optical signal coming out of the beam-shrinking module enters the receiver optical fiber coupler, and the receiver optical fiber coupler can be connected with the existing receiver optical fiber system through an optical fiber; the transmitter comprises a beam expanding module and a transmitter optical fiber collimator, the beam expanding module and the transmitter optical fiber collimator are sequentially arranged and aligned on an optical path, namely, an optical signal coming out of the transmitter optical fiber collimator enters the beam expanding module, and the transmitter optical fiber collimator can be connected with an existing transmitter optical fiber system through optical fibers; the beam shrinking module comprises a first-stage shrinking unit and a second-stage shrinking unit, the first-stage shrinking unit, the second-stage shrinking unit and the receiver optical fiber coupler are sequentially arranged on the same optical path, the shrinking multiple of the first-stage shrinking unit is larger than that of the second-stage shrinking unit so as to simplify the structure of the second-stage shrinking unit, the shrinking multiple of the first-stage shrinking unit is 10-18 times, the shrinking multiple of the second-stage shrinking unit is 1-4 times, and the specific shrinking multiple can be adjusted according to adjustment of element parameters in the beam shrinking module; the beam expanding module comprises a first-stage beam expanding unit and a second-stage beam expanding unit, a transmitter optical collimator, the first-stage beam expanding unit, the second-stage beam expanding unit is sequentially arranged on the same optical path, the beam expanding multiple of the first-stage beam expanding unit is smaller than that of the second-stage beam expanding unit so as to simplify the structure of the first-stage beam expanding unit, the beam expanding multiple of the first-stage beam expanding unit is 1-4 times, the beam expanding multiple of the second-stage beam expanding unit is 6-14 times, and the specific beam expanding multiple can be adjusted according to the adjustment of element parameters in the beam expanding module.
In the system provided by the embodiment of the application, coupling from a large-caliber space beam to a single-mode fiber and emission from the single-mode fiber to the large-caliber space beam can be realized by setting the beam shrinking module of the receiver and the optical fiber coupler of the receiver, and setting the beam expanding module of the transmitter and the optical fiber collimator of the transmitter. The first-stage beam-reducing unit and the second-stage beam-reducing unit are used for realizing graded beam-reducing, the complex beam-reducing process is decomposed into two-stage beam-reducing, the beam-reducing effect is ensured through the multiple relation between the two-stage beam-reducing, optical devices required by beam-reducing are simplified, the strict limitation on the system element parameters is broken through to reduce the design difficulty and cost of space optics, and meanwhile, the tolerance performance and the system stability are improved, so that the beam-reducing of the space light is realized simply and cheaply with high performance, and then the existing receiver optical fiber system can be connected through the receiver optical fiber coupler; realize expanding the beam in grades through first order beam expanding unit and second level beam expanding unit, expand the beam process decomposition into the two-stage with the complicacy and expand the beam, when expanding the effect through the multiple relation assurance between the two-stage beam expanding, the required optical device of beam has been simplified, break through the design degree of difficulty and the cost in order to reduce space optics to the strict restriction of system component parameter, improve tolerance performance and system stability simultaneously, thereby high performance, it is simple, realize expanding of space light with low costs, then can connect current transmitter fiber system through transmitter fiber collimator.
Referring to fig. 2, the beam-condensing module includes a first quadric plane convex-concave reflecting mirror 2, a first quadric plane concave-convex reflecting mirror 1, a first eyepiece group 3, a first turning reflecting mirror 4, a first plane reflecting galvanometer 5, a first dichroic beam splitter 6, a narrow-band filter 7, a first plano-convex lens 8, and a first biconcave lens 9. The first quadric plane convex reflector 2, the first quadric plane concave reflector 1 and the first ocular group 3 are sequentially arranged and the centers of the first quadric plane convex reflector, the first quadric plane concave reflector and the first ocular group are coaxial to form a first-stage beam shrinking unit. The first plano-convex lens 8 and the first biconcave lens 9 are sequentially arranged and the centers of the first plano-convex lens and the first biconcave lens are coaxial to form a second-stage beam shrinking unit; the combined beam light composed of the beacon light and the communication light is reflected by a first quadric plane concave reflector 1, a first quadric plane convex reflector 2 and a first eyepiece group 3 in sequence to carry out first-stage beam reduction; the combined beam light transmitted by the first eyepiece group 3 is reflected by the first deflecting reflector 4, reflected by the first plane reflection galvanometer 5 and split by the first dichroic beam splitter 6 in sequence, the communication light split by the first dichroic beam splitter 6 is filtered by the narrow-band filter 7, and the filtered communication light is subjected to second-stage beam shrinkage by the first plano-convex lens 8 and the first biconcave lens 9 in sequence.
Referring to fig. 2, specifically, a concave surface of the first quadric flat concave reflecting mirror 1 is opposite to a convex surface of the first quadric flat convex reflecting mirror 2, the concave surface of the first quadric flat concave reflecting mirror 1 is used for reflecting the combined beam, the combined beam is reflected to the convex surface of the first quadric flat convex reflecting mirror 2 through the concave surface of the first quadric flat concave reflecting mirror 1, and the combined beam can be totally reflected to the convex surface of the first quadric flat convex reflecting mirror 2 through the concave surface of the first quadric flat concave reflecting mirror 1 by setting parameters such as the curvature radius of the concave surface of the first quadric flat concave reflecting mirror 1, the diameter and the thickness of the first quadric flat concave reflecting mirror 1, the distance between the first quadric flat concave reflecting mirror 1 and the first quadric flat convex reflecting mirror 2, and the like; the combined beam reflected by the convex surface of the first quadric plano-convex reflector 2 is reflected to the first ocular group 3, the combined beam can be totally reflected to the first ocular group 3 by setting the curvature radius of the convex surface of the first quadric plano-convex reflector 2 and the parameters of the diameter, the thickness and the like of the first quadric plano-convex reflector 2, the first ocular group 3 is arranged at the central axis of the first quadric plano-concave reflector 1, specifically, the central axis of the first quadric plano-concave reflector 1 is penetrated and provided with a first hole, the first ocular group 3 is arranged in the first hole, the first ocular group 3 comprises a first single lens 31 and a first doublet 32, the first single lens 31 is a plano-concave lens, the first doublet 32 is a doublet lens, the first single lens 31 and the first doublet 32 are sequentially arranged and coaxially arranged at the center to form the first ocular group 3, the convex surface of the first quadric plano-convex reflector 2 faces to the plane of the first single lens 31, the concave surface of the first single lens 31 faces the first double lens 32, and the combined beam is transmitted through the first single lens 31 and then through the first double lens 32. The first-stage beam reduction can be carried out on the combined beam, and the beam reduction multiple of the beam can be adjusted according to the setting of the parameters such as the diameter, the thickness, the curvature radius and the like of the first quadric surface planoconvex reflector 2, the first quadric surface planoconcave reflector 1 and the first eyepiece group 3.
Referring to fig. 2 and 3, the first quadric planoconcave mirror 1 is sequentially followed by the first turning mirror 4, that is, the combined beam transmitted from the first eyepiece group 3 is sequentially reflected by the first turning mirror 4, specifically, the combined beam transmitted from the first eyepiece group 3 is incident on the mirror surface of the first turning mirror 4 at an incident angle of 45 degrees and is reflected at a reflecting angle of 45 degrees. The first turning mirror 4 is a fixed turning mirror for changing the direction of the light path to reduce the volume of the system. The combined beam reflected from the first folding mirror 4 then hits the mirror surface of the first plane mirror 5 at an incident angle of 45 degrees and reflects off the mirror surface at a reflecting angle of 45 degrees, and the first plane mirror 5 can be jogged to compensate the optical axis shake of the equipment platform and can change the optical path direction to reduce the system volume. The combined beam reflected from the first plane mirror 5 is then incident on the mirror surface of the first dichroic beamsplitter 6 at an incident angle of 45 degrees to split the combined beam, i.e., the beacon light is reflected at the first dichroic beamsplitter 6 and the communication light is transmitted, specifically, the beacon light is reflected at the reflected angle of 45 degrees, and the communication light is transmitted out of the mirror surface of the first dichroic beamsplitter 6 in a direction parallel to the combined beam. The communication light transmitted through the first dichroic beamsplitter 6 is then filtered through a narrow band filter 7, the narrow band filter 7 serving to filter out spatial stray light as well as unwanted beacon light. The communication light filtered by the narrow-band filter 7 is subjected to second-stage beam reduction, specifically, the narrow-band filter 7, a first plano-convex lens 8 and a first biconcave lens 9 are sequentially arranged and have coaxial centers, and the convex surface of the first plano-convex lens 8 faces to the narrow-band filter 7; the beam reduction factor of the light beam can be adjusted according to the setting of the diameter, the thickness, the curvature radius and other parameters of the first plano-convex lens 8 and the first biconcave lens 9, and in the embodiment, the beam reduction factor of the second stage beam reduction unit is 1-4 times.
Referring to fig. 2, a receiver fiber coupler 10 is sequentially disposed behind the first biconcave lens 9, the first plano-convex lens 8, the first biconcave lens 9, and the receiver fiber coupler 10 are sequentially arranged, the communication light transmitted through the first biconcave lens 9 enters the receiver fiber coupler 10, and the receiver fiber coupler 10 is connected to a single-mode fiber for connecting to an existing fiber system for decoding and detecting.
Through the mode, two-stage beam shrinkage is realized, and compared with a one-stage beam shrinkage system, the two-stage beam shrinkage can break through strict limitation on system element parameters so as to reduce the design difficulty of space optics and improve tolerance performance and system stability; in addition, by adopting two-stage beam-shrinking, the plane reflection galvanometer can be placed in the middle light path of the two-stage beam-shrinking, and the high cost caused by the large-caliber plane reflection galvanometer can be avoided while the alignment disturbance of the relative vibration of the light beam receiving and transmitting telescopic system platform to the signal light is compensated.
Referring to fig. 4, the beam expanding module includes a second biconcave lens 14, a second plano-convex lens 15, a second dichroic beam splitter 16, a second plane mirror 17, a second turning mirror 18, a second ocular set 19, a second quadric plano-concave mirror 21, and a second quadric plano-convex mirror 20. The second biconcave lens 14 and the second plano-convex lens 15 are sequentially arranged and the centers of the biconcave lens and the second plano-convex lens are coaxial to form a first-stage beam expanding unit; the second eyepiece group 19, the second quadric plane concave reflector 21 and the second quadric plane convex reflector 20 are sequentially arranged and the centers of the second quadric plane convex reflector and the second quadric plane concave reflector are coaxial to form a second stage beam expanding unit; the communication light sequentially passes through a second biconcave lens 14 and a second plano-convex lens 15 to carry out primary beam expansion, the communication light transmitted by the second plano-convex lens 15 and the beacon light are combined into combined light at a second dichroic beam splitter 16, the combined light formed by combining the communication light and the beacon light at the second dichroic beam splitter 16 is sequentially reflected by a second plane reflection galvanometer 17 and a second turning reflector 18, and the combined light reflected by the second turning reflector 18 is sequentially transmitted by a second ocular group 19, reflected by a second secondary curved plano-convex reflector 20 and reflected by a second secondary curved plano-concave reflector 21 to carry out secondary beam expansion.
Referring to fig. 4, specifically, the second biconcave lens 14 and the second biconcave lens 15 are sequentially arranged and coaxially arranged at the center to form a first-stage beam expansion unit, the plane of the second biconcave lens 15 faces one concave surface of the second biconcave lens 14, the convex surface of the second biconcave lens 15 faces the second dichroic beam splitter 16, and the beam expansion multiple of the communication light beam emitted by the transmitter fiber collimator 13 can be adjusted according to the setting of parameters such as the diameter, the thickness, and the radius of curvature of the second biconcave lens 14 and the second biconcave lens 15, and in this embodiment, the beam expansion multiple of the first-stage beam expansion unit is 2 times.
Referring to fig. 4, a transmitter optical fiber collimator 13 is disposed in front of the second double concave lens 14, the transmitter optical fiber collimator 13, the second double concave lens 14, and the second plano-convex lens 15 are sequentially arranged, the communication light enters the second double concave lens 14 after passing through the transmitter optical fiber collimator 13, and the transmitter optical fiber collimator 13 is connected to a single-mode optical fiber and connected to an existing optical fiber system through the single-mode optical fiber.
Referring to fig. 4, the communication light transmitted through the second plano-convex lens 15 then strikes the mirror surface of the second dichroic beam splitter 16 to combine the communication light with the beacon light, i.e., the beacon light is reflected on the second dichroic beam splitter 16 and the communication light is transmitted, and the transmitted communication light and the reflected beacon light form combined light. The combined beam light combined by the second dichroic beam splitter 16 is incident on the mirror surface of the second plane reflection galvanometer 17 at an incident angle of 45 degrees and is reflected out of the mirror surface at a reflection angle of 45 degrees, and the second plane reflection galvanometer 17 is arranged to slightly move so as to compensate the optical axis shake of the equipment platform and change the direction of the optical path so as to reduce the volume of the system. The combined beam reflected by the second plane mirror 17 strikes the mirror surface of the second turning mirror 18 at an incident angle of 45 degrees and leaves the mirror surface of the second turning mirror 18 at a reflecting angle of 45 degrees, and the second turning mirror 18 can change the direction of the light path to reduce the volume of the system. The combined beam reflected by the second turning reflector 18 enters a second ocular group 19, the second ocular group 19 is disposed at a central axis of a second quadric planoconcave reflector 21, specifically, a second hole is formed through the central axis of the second quadric planoconcave reflector 21, the second ocular group 19 is disposed in the second hole, the second ocular group 19 includes a second single lens 191 and a second double lens 192, the second single lens 191 is a planoconcave lens, the second double lens 192 is a double cemented lens, the second single lens 191 and the second double lens 192 are sequentially arranged and coaxially centered to form the second ocular group 19, a concave surface of the second single lens 191 faces the second double lens 192, and the combined beam is transmitted through the second single lens 191 after being transmitted through the second double lens 192.
Referring to fig. 4, the combined beam of light transmitted from the second eyepiece group 19 all strikes the convex surface of the second quadric flat-convex mirror 20, specifically, the convex surface of the second quadric flat-convex mirror 20 faces the second single lens 191 in the second eyepiece group 19, and the combined beam of light can all strike the convex surface of the second quadric flat-convex mirror 20 by setting the radius of curvature of the second quadric flat-convex mirror 20 and the parameters of the diameter, thickness, etc. of the second quadric flat-convex mirror 20; the convex surface of the second quadric surface plano-convex reflector 20 is opposite to the concave surface of the second quadric surface plano-concave reflector 21, the combined beam is reflected to the concave surface of the second quadric surface plano-concave reflector 21 through the convex surface of the second quadric surface plano-convex reflector 20, and the combined beam can be totally reflected to the concave surface of the second quadric surface plano-concave reflector 21 through the parameters such as the curvature radius of the concave surface of the second quadric surface plano-concave reflector 21, the diameter and the thickness of the second quadric surface plano-concave reflector 21, the distance between the second quadric surface plano-concave reflector 21 and the second quadric surface plano-convex reflector 20 and the like; the combined beam reflected by the concave surface of the second quadric plane-concave reflecting mirror 21 is projected to a receiver in the free space beam receiving and transmitting telescopic system.
Through the mode, two-stage beam expansion is realized, and compared with a one-stage beam expansion system, the two-stage beam expansion can break through strict limitation on system element parameters so as to reduce the design difficulty of space optics and improve tolerance performance and system stability; in addition, two-stage beam expansion is adopted, the plane reflection galvanometer can be placed in a middle light path of the two-stage beam expansion, and high cost caused by the large-diameter plane reflection galvanometer can be avoided while the relative vibration of a light beam receiving and transmitting telescopic system platform is compensated to the alignment disturbance of signal light.
It should be noted that, in the description of the present application, the terms "first", "second", and the like are used for descriptive purposes only and for distinguishing similar objects, and no precedence between the two is intended or should be construed to indicate or imply relative importance. In addition, in the description of the present application, "a plurality" means two or more unless otherwise specified.
The present application has been described in detail with reference to specific embodiments and illustrative examples, but the description is not intended to limit the application. Those skilled in the art will appreciate that various equivalent substitutions, modifications or improvements may be made to the presently disclosed embodiments and implementations thereof without departing from the spirit and scope of the present disclosure, and these fall within the scope of the present disclosure. The protection scope of this application is subject to the appended claims.
Claims (10)
1. A free space light beam receiving and transmitting telescopic system is characterized by comprising a receiver and a transmitter; the receiver comprises a beam-shrinking module and a receiver optical fiber coupler, and the transmitter comprises a beam-expanding module and a transmitter optical fiber collimator;
the beam shrinking module comprises a first-stage shrinking unit and a second-stage shrinking unit, a first quadric surface plano-convex reflector, a first quadric surface plano-concave reflector and a first eyepiece group are sequentially arranged and coaxially arranged at the center to form the first-stage shrinking unit, a first plano-convex lens and a first biconcave lens are sequentially arranged and coaxially arranged at the center to form the second-stage shrinking unit, the shrinking multiple of the first-stage shrinking unit is greater than that of the second-stage shrinking unit, the first-stage shrinking unit, the second-stage shrinking unit and the receiver optical fiber coupler are sequentially arranged on the same optical path, and the receiver optical fiber coupler is connected with a single-mode optical fiber;
the light beam expanding module comprises a first-stage beam expanding unit and a second-stage beam expanding unit, wherein a second biconcave lens and a second biconcave lens are sequentially arranged and coaxially arranged at the center to form the first-stage beam expanding unit, a second eyepiece group, a second quadric plano-concave reflector and a second quadric plano-convex reflector are sequentially arranged and coaxially arranged at the center to form the second-stage beam expanding unit, the beam expanding multiple of the first-stage beam expanding unit is smaller than that of the second-stage beam expanding unit, the transmitter optical fiber collimator, the first-stage beam expanding unit and the second-stage beam expanding unit are sequentially arranged on the same optical path, and the transmitter optical fiber collimator is connected with a single-mode optical fiber.
2. The free-space beam transmitting and receiving telescopic system according to claim 1, wherein the beam-shrinking module further includes a first turning reflector, a first plane-reflecting polarizer, a first dichroic beam splitter, and a narrow-band optical filter, which are sequentially disposed, the first turning reflector is disposed at a rear end of the first-stage shrinking unit, and the narrow-band optical filter is disposed at a front end of the second-stage shrinking unit.
3. The free-space beam receiving and transmitting telescopic system according to claim 1, wherein the beam expanding module further comprises a second dichroic beam splitter, a second plane mirror, and a second turning mirror, which are sequentially disposed, the second dichroic beam splitter is disposed at a rear end of the first stage beam expanding unit, and the second turning mirror is disposed at a front end of the second stage beam expanding unit.
4. The free-space optical beam transceiving telescopic system according to claim 1, wherein a first hole is formed through a central axis of the first quadric plano-concave reflector, the first eyepiece group is disposed in the first hole, the first eyepiece group comprises a first single lens and a first double lens, the first single lens is a plano-concave lens, and the first double lens is a double cemented lens.
5. The free-space optical beam transceiver telescopic system according to claim 1, wherein the receiver fiber coupler is disposed behind the first biconcave lens, the first planoconvex lens, the first biconcave lens, and the receiver fiber coupler are arranged in sequence, and the communication light transmitted through the first biconcave lens enters the receiver fiber coupler.
6. The free-space optical beam transceiving telescopic system according to claim 4, wherein the first quadric plano-concave mirror comprises opposing flat surfaces and concave surfaces, the first quadric plano-convex mirror comprises opposing flat surfaces and convex surfaces, the concave surface of the first quadric plano-concave mirror faces the convex surface of the first quadric plano-convex mirror, and the convex surface of the first quadric plano-convex mirror faces the first single lens.
7. The free-space light beam transceiving telescopic system according to claim 1, wherein a second hole is formed through a central axis of the second quadric plano-concave reflector, the second eyepiece group is disposed in the second hole, the second eyepiece group includes a second single lens and a second double lens, the second single lens is a plano-concave lens, and the second double lens is a double cemented lens.
8. The free-space beam transceiver telescopic system of claim 1, wherein the transmitter fiber collimator is disposed in front of the second biconcave lens, the transmitter fiber collimator, the second biconcave lens, and the second plano-convex lens are arranged in sequence, and the communication light enters the second biconcave lens after passing through the transmitter fiber collimator.
9. The free-space optical beam transmit-receive telescopic system according to claim 7, wherein the second quadric plano-convex mirror includes opposite flat surfaces and convex surfaces, the second quadric plano-concave mirror includes opposite flat surfaces and concave surfaces, the convex surface of the second quadric plano-convex mirror faces the concave surface of the second quadric plano-concave mirror, and the convex surface of the second quadric plano-convex mirror faces the second single lens.
10. The free-space beam transceiver telescopic system of claim 2, wherein said first plano-convex lens comprises opposing flat and convex surfaces, the convex surface of said first plano-convex lens facing said narrow band filter.
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