CN115499064B - Miniaturized multi-core transmitting-receiving laser communication device based on variable optical axis and design method - Google Patents
Miniaturized multi-core transmitting-receiving laser communication device based on variable optical axis and design method Download PDFInfo
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- CN115499064B CN115499064B CN202211389999.4A CN202211389999A CN115499064B CN 115499064 B CN115499064 B CN 115499064B CN 202211389999 A CN202211389999 A CN 202211389999A CN 115499064 B CN115499064 B CN 115499064B
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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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- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
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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
- H04B10/25—Arrangements specific to fibre transmission
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The invention discloses a miniaturized multi-core transceiving laser communication device based on a variable optical axis and a design method thereof. The invention simplifies the design of the space light path, reduces the volume and weight of the optical antenna and reduces the difficulty and cost of production and maintenance.
Description
Technical Field
The invention belongs to the technical field of optical equipment, and particularly relates to a miniaturized multi-core transmitting-receiving laser communication device based on a variable optical axis and a design method.
Background
Compared with the existing microwave communication technology, the satellite laser communication technology has the remarkable advantages of high data rate, good interference resistance and confidentiality and the like, and is an effective supplementary technical means for satellite communication in the future. At present, a plurality of satellite optical communication on-orbit tests are developed at home and abroad, and military and commercial aerospace applications are gradually developed.
Compared with a traditional microwave communication system, the laser communication system is superior to a laser communication system which adopts a light wave band as an information carrier (carrier 10 to 400THz), has extremely high communication bandwidth, and has the outstanding advantages of light weight, small volume and low power consumption.
The largest guarantee from the aspect of the shape and the microwave radio frequency antenna is that a highly integrated and complex optical antenna is needed, and generally comprises a signal light emitting optical path, a signal light receiving optical path, a beacon light emitting optical path, a beacon light receiving optical path and a corresponding beam expanding antenna. In general, a common laser communication terminal adopts a small-sized method such as a receiving-transmitting common optical antenna design and a beacon-free design in time, independent spatial optical paths such as a signal light emission rear optical path, a signal light reception rear optical path and a beacon light emission/reception rear optical path still need to exist, the optical paths require that a spatial lens is utilized to realize coaxial assembly with the coaxiality being better than 10 μ rad, the requirements of the spatial optical paths are better than the requirements of a multi-optical axis and a high-precision spatial optical path, the size and the weight of the laser communication terminal are difficult to further reduce, and a series of problems are brought to assembly and maintenance.
The conventional optical antenna is a spatial optical device, and as shown in fig. 1, the conventional optical antenna includes a beam expanding antenna 1, a first fast reflector 2, a dichroic mirror 3, a first beam splitter 4, a beacon receiving optical lens group 5, a beacon optical detector 6, a second fast reflector 7, a multi-core optical fiber coupler 8, a filter 9, a signal detector 10, a third fast reflector 11, a second beam splitter 12, a beacon transmitting optical lens group 13, a beacon laser 14, a signal transmitting optical lens group 15, and a signal laser 16.
However, the following problems exist in the current optical path mode after the terminal space light: 1) The device cost is high; 2) The processing and assembling difficulty is high, and the period is long; 3) Difficulty in fault maintenance and repair; 4) The volume and the weight are large; 5) It is not easy to mass-produce.
Disclosure of Invention
In order to solve the problems, the invention discloses a miniaturized multi-core transmitting-receiving laser communication device based on a variable optical axis and a design method thereof, which utilize devices such as a precise fast reflecting mirror, a multi-core optical fiber device, an optical fiber filter and the like to realize multiplexing of different receiving optical fiber receiving surfaces, realize time division receiving of coherent polarization maintaining, high-speed single mode and low-speed multi-mode, greatly reduce the requirement on the number of spatial optical paths, simplify the design of the spatial optical paths, reduce the volume and weight of an optical antenna, reduce the production and maintenance difficulty and cost, reduce the requirement of the optical antenna on environmental control, and adopt the optical fiber devices produced in batch to reduce the cost of system devices.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the utility model provides a miniaturized multicore receiving and dispatching laser communication device based on variable optical axis, includes signal light emission light path, beacon light emission light path, signal light receiving light path, beacon light receiving light path, wherein adopt multicore fiber coupler in the signal light receiving light path, couple to multicore fiber end face, multicore fiber coupler includes that a plurality of single mode fiber core and a plurality of multimode fiber core install in a unified optical fiber cladding, and wherein every single mode fiber core and every multimode fiber core all insert corresponding signal light detector through a respective corresponding fiber filter, form multichannel signal light receiving light path.
Further, miniaturized multicore send-receiver laser communication device based on variable optical axis includes beam expanding antenna, quick speculum one, dichroic mirror, spectroscope one, receives beacon light set, beacon light detector, quick speculum two, multicore fiber coupler, fiber optic filter, signal detector, quick speculum three, spectroscope two, launches beacon light set, beacon laser instrument, transmission signal light set, signal laser instrument, wherein:
signal light emission optical path: the signal light laser emits signal light, the signal light is shaped by the signal light emitting mirror group, then is combined with the beacon beam by the beam splitter II, is combined with the received light beam by the fast reflector III and the dichroic mirror, and enters the beam expanding antenna by the fast reflector I to form a signal light emitting optical path;
beacon light emission light path: the beacon light laser emits beacon light, the beacon light is shaped by the beacon light emitting mirror group, then is combined with the signal light by the spectroscope II, is combined with the received light beam by the quick reflector III and the color separation mirror, and enters the beam expanding antenna by the quick reflector I to form a beacon light emitting light path;
beacon receiving optical path: the beam expanding antenna enters a terminal, is shaped and compressed, then is reflected by a first quick reflector and a dichroic mirror to separate the reflected wavelength, is subjected to power or wavelength separation by a first spectroscope, and is focused on a focal plane of a beacon light detector by a beacon light receiving lens group to form a beacon light receiving light path;
signal light receiving optical path: the beam expanding antenna enters a terminal, after shaping and compression, reflected wavelength separation is carried out through a first quick reflector and a dichroic mirror, power or wavelength separation is carried out through a first spectroscope, a second quick reflector is entered, the angle of the second quick reflector is adjusted, so that incident signal light is coupled to the end face of a multi-core optical fiber through a multi-core optical fiber coupling optical fiber coupler, and is respectively connected into corresponding signal light detectors through respective optical fiber filters to form a multi-channel signal light receiving optical path.
The design method of the miniaturized multi-core transceiver laser communication device based on the variable optical axis comprises the following steps of:
(a) Selecting a multi-core optical fiber coupler according to design requirements, wherein the multi-core optical fiber coupler comprises a plurality of single-mode optical fiber cores and a plurality of multi-mode optical fiber cores which are arranged in a unified optical fiber cladding; in the multi-core fiber coupler, A is a polarization maintaining fiber, B is a single mode fiber, and K is a multi-mode fiber with respective radiusesr A、 r B、 r K The distances between AB, AK and BK are respectivelyd1、d2 andd3, in the design, the minimum value of numerical apertures NA of A, B and K fiber cores is taken as a design basis, and the design of the multi-core optical fiber coupler L needs to meet the following requirements:
wherein D is the beam diameter of the incident end of the multi-core fiber coupler;
(b) Selecting a second quick reflector according to the multi-core fiber coupler focal length obtained in the step (a), wherein the corresponding deflection range M needs to meet the following requirements:
(c) An optical fiber filter: selecting an optical fiber filter conforming to an ITU protocol according to the wavelength of the signal light, and performing narrow-band filtering on the signal light input by the photoelectric detector, wherein the smaller the filtering bandwidth is, the better the filtering bandwidth is under the same condition;
(d) A photoelectric detector: selecting different multi-core optical fibers according to the requirements of different communication systems, selecting a PM polarization maintaining optical fiber for a coherent communication terminal, selecting a single mode optical fiber for a high-speed incoherent communication terminal, and selecting a multi-mode optical fiber for a low-speed incoherent communication terminal;
(e) In use, calibration is needed to be carried out firstly, and the specific method of the calibration is as follows:
an angle reflection prism is inserted between the dichroic mirror and the first spectroscope, the signal light laser is respectively used for replacing the signal light detector and emitting light, and the light beam reflects the beacon light receiving light path after passing through the angle reflection prism and forms an image on the beacon light detector;
adjusting the second quick reflector to enable the spot coordinates output by the different signal light detectors on the focal plane of the beacon light detector to correspond to the communication central point of the communication terminal, and respectively recording the deflection values (X) of the second quick reflector when the different signal light detectors output Ai 、Y Ai ），（X Bi 、Y Bi ），（X Ki 、Y Ki ) Respectively corresponding to a polarization maintaining fiber A, a single mode fiber B and a multimode fiber K in the multi-core fiber coupler;
in the terminal work, according to the work required to be completed in the work, the second quick reflector is controlled to be respectively pre-biased (X) Ai 、Y Ai ）/（X Bi 、Y Bi ）/（X Ki 、Y Ki ) The switching of the signal light receiving beam can be completed.
The invention has the beneficial effects that:
the invention utilizes devices such as a precise fast reflecting mirror, a multi-core optical fiber device, an optical fiber filter and the like to realize multiplexing of different receiving optical fiber receiving surfaces, realizes time division receiving of coherent polarization maintaining, high-speed single mode and low-speed multi-mode, greatly reduces the requirement on the number of spatial optical paths, simplifies the design of the spatial optical paths, reduces the volume and weight of the optical antenna, reduces the production and maintenance difficulty and cost, reduces the requirement of the optical antenna on environmental control, and can reduce the cost of system devices by adopting the optical fiber devices produced in batch. Specifically, compared with the traditional space optical path laser communication antenna, the system has the advantages that the signal light receiving optical path is only 2.2kg and is far less than the weight of the traditional laser antenna from 8 to 9kg, and the weight of the rotary table is reduced by more than 20kg along with the reduction of the load; because optical fiber connection is adopted, the period from the production of the developed device to the assembly of the whole machine is shortened from the original plan to 120 days and is finished in 35 days; due to the adoption of the technology, the development cost is reduced to 9 ten thousand yuan (without the charge of a CCD) from 25 ten thousand yuan of the traditional optical path.
Drawings
Fig. 1 is a prior art optical antenna diagram of a laser communication terminal according to the background art;
FIG. 2 is a multi-core transceiver laser communication device of the present invention;
FIG. 3 is a cross-sectional view of a multi-core fiber coupler of the present invention;
FIG. 4 is a cross-sectional view of a multi-core fiber coupler in an actual measurement case;
FIG. 5 is a calibration schematic of the present invention.
List of reference symbols:
1 beam expanding antenna, 2 fast reflector I, 3 dichroic mirror, 4 spectroscope I, 5 receipt beacon light group, 6 beacon light detector, 7 fast reflector II, 8 multicore fiber coupler, 9 fiber filter, 10 signal detector, 11 fast reflector III, 12 spectroscope II, 13 transmission beacon light group, 14, beacon laser, 15 transmission signal light group, 16 signal laser, 17 angle reflecting prism.
Detailed Description
The present invention will be further illustrated with reference to the accompanying drawings and specific embodiments, which are to be understood as merely illustrative of the invention and not as limiting the scope of the invention.
As shown in fig. 2, the miniaturized multi-core transceiving laser communication device based on the variable optical axis of the embodiment includes a signal light emitting optical path, a beacon light emitting optical path, a signal light receiving optical path, and a beacon light receiving optical path, wherein a multi-core optical fiber coupler 8 is adopted in the signal light receiving optical path and coupled to the end face of the multi-core optical fiber, the multi-core optical fiber coupler includes a plurality of single-mode optical fiber cores and a plurality of multi-mode optical fiber cores, and is installed in a unified optical fiber cladding, as shown in fig. 3, wherein each single-mode optical fiber core and each multi-mode optical fiber core are respectively connected to a corresponding signal light detector 9 through a corresponding optical fiber filter, and a multi-channel signal light receiving optical path is formed.
Further, the miniaturized multi-core transceiver laser communication device based on the variable optical axis comprises a beam expanding antenna 1, a first quick reflector 2, a dichroic mirror 3, a first beam splitter 4, a first beacon receiving optical lens group 5, a beacon optical detector 6, a second quick reflector 7, a multi-core optical fiber coupler 8, an optical fiber filter 9, a signal detector 10, a third quick reflector 11, a second beam splitter 12, a second beacon transmitting optical lens group 13, a beacon laser 14, a signal transmitting optical lens group 15 and a signal laser 16, wherein:
signal light emission optical path: the signal light laser 16 emits signal light, the signal light is shaped by the signal light emitting mirror group 15, then is combined with the beacon beam by the beam splitter two 12, is combined with the received light beam by the fast reflector three 11, the dichroic mirror 3 and enters the beam expanding antenna 1 by the fast reflector one 2 to form a signal light emitting light path;
beacon light emission optical path: the beacon light laser 14 emits beacon light, is shaped by the beacon light emitting lens group 13, then is combined with the signal beam by the beam splitter two 12, is combined with the received beam by the fast reflector three 11 and the dichroic mirror 3, and enters the beam expanding antenna 1 by the fast reflector one 2 to form a beacon light emitting light path;
beacon receiving optical path: the beam expanding antenna 1 enters a terminal, after shaping and compression, reflected wavelength separation is carried out by a fast reflector I2 and a dichroic mirror 3, power or wavelength separation is carried out by a dichroic mirror I4, and then the reflected wavelength separation is focused on a focal plane of a beacon light detector 6 by a beacon light receiving optical lens group 5 to form a beacon light receiving optical path;
signal light receiving optical path: the beam expanding antenna 1 enters a terminal, reflected wavelength separation is carried out through a first quick reflector 2 and a dichroic mirror 3 after shaping and compression, power or wavelength separation is carried out through a first spectroscope 4, incident quick reflector 7 is made to enter a second quick reflector 7, and incident signal light is coupled to the end face of a multi-core optical fiber through a multi-core optical fiber coupling optical fiber coupler 8 by adjusting the angle of the second quick reflector 7, passes through respective optical fiber filters 9 and is respectively connected into corresponding signal light detectors 10 to form a multi-channel signal light receiving optical path.
The design method of the miniaturized multi-core transceiver laser communication device based on the variable optical axis comprises the following steps of:
(a) Selecting a multi-core optical fiber coupler according to design requirements, wherein the multi-core optical fiber coupler comprises a plurality of single-mode optical fiber cores and a plurality of multi-mode optical fiber cores which are arranged in a unified optical fiber cladding; in the multi-core fiber coupler, A is a polarization maintaining fiber, B is a single mode fiber, and K is a multi-mode fiber with respective radiusesr A、 r B、 r K The distances between AB, AK and BK are respectivelyd1、d2 andd3, in the design, the minimum value of numerical apertures NA of A, B and K fiber cores is taken as a design basis, and the design of the multi-core optical fiber coupler L needs to meet the following requirements:
d is the beam diameter of the incident end of the multi-core fiber coupler;
(b) Selecting a second quick reflector according to the multi-core fiber coupler focal length obtained in the step (a), wherein the corresponding deflection range M needs to meet the following requirements:
(c) An optical fiber filter: selecting an optical fiber filter conforming to an ITU protocol according to the wavelength of the signal light, and performing narrow-band filtering on the signal light input by the photoelectric detector, wherein the smaller the filtering bandwidth is, the better the filtering bandwidth is under the same condition;
(d) A photoelectric detector: selecting different multi-core optical fibers according to the requirements of different communication systems, selecting a PM polarization maintaining optical fiber for a coherent communication terminal, selecting a single mode optical fiber for a high-speed incoherent communication terminal, and selecting a multi-mode optical fiber for a low-speed incoherent communication terminal;
(e) During use, calibration is needed to be carried out firstly, and the specific method for calibration is as follows:
an angle reflecting prism 17 is inserted between the dichroic mirror and the first spectroscope, the signal light laser is respectively used for replacing the signal light detector 10 and emitting light, and the light beam reflects a beacon light receiving light path after passing through the angle reflecting prism and forms an image on the beacon light detector;
adjusting the second quick reflector to enable the spot coordinates output by the different signal light detectors on the focal plane of the beacon light detector to correspond to the communication central point of the communication terminal, and respectively recording the deflection values (X) of the second quick reflector when the different signal light detectors output Ai 、Y Ai ），（X Bi 、Y Bi ），（X Ki 、Y Ki ) Respectively corresponding to a polarization maintaining fiber A, a single mode fiber B and a multimode fiber K in the multi-core fiber coupler;
in the terminal work, according to the work needed to be completed in the work, the second quick reflector is controlled to be respectively pre-biased (X) Ai 、Y Ai ）/（X Bi 、Y Bi ）/（X Ki 、Y Ki ) The switching of the signal light receiving beam can be completed.
The actual measurement cases are as follows:
multi-core fiber: in the actual measurement case, the ground station adopts a three-core optical fiber (PM 155 polarization maintaining optical fiber, SFM28 single mode optical fiber, 62.5 multimode optical fiber) as a signal receiving end; adjacent fibers are 40 μm apart from each other; as shown in fig. 4, the multi-core coupler: 10.5 μm for A fiber, 0.14 for NA, 10.5 μm for B fiber, 0.14 for NA, 62.5 μm for K fiber, 0.22 for NA, 9mm for spot diameter, and 20.45mm for L minimum, and 27mm is actually selected.
And (3) selecting a second quick reflector: the maximum deflection distance is (31.25 +40+ 5.25) μm, and the maximum deflection angle is: 2mrad.
An optical fiber filter: according to the wavelength of the signal light, the A core and the B core select a C46 channel filter, the filter bandwidth is 0.8nm, and the bandwidth of the K core select filter is 1.6nm.
A photoelectric detector: the A core is connected with a polarization-preserving amplification EDFA, the B core is connected with a non-polarization-preserving amplification EDFA, and the K core is directly connected with the multimode detector for direct demodulation.
During use, calibration is needed to be performed firstly, as shown in fig. 5, an angle reflecting prism 17 is inserted between the dichroic mirror 3 and the first dichroic mirror 4, the signal light laser replaces the signal light detectors respectively and emits light, and after light beams pass through the angle reflecting prism 17, a beacon light receiving light path is reflected and images are formed on the beacon light detector 6; adjusting the second quick reflector 7 to enable the spot coordinates of different laser outputs for replacing the signal light detector on the focal plane of the beacon light detector 6 to correspond to the communication central point of the communication terminal, and respectively recording the deflection values (220, 100), (1552, 117), (884 and 2170) of the second quick reflector 7 in different light beams, wherein the deflection values correspond to a fiber core A, B, K in the graph of fig. 4; in the terminal work, according to the work required to be completed in the work, the 7 fast-reflection mirrors are controlled to be respectively pre-biased (220, 100)/(1552, 117)/(884, 2170), and then the switching of the signal light receiving speed can be completed.
Compared with a traditional space optical path laser communication antenna, the system has the advantages that the signal light receiving optical path is only 2.2kg and is far smaller than the traditional laser antenna in weight of 8-9kg, and the weight of the rotary table is reduced by more than 20kg along with the reduction of the load;
because optical fiber connection is adopted, the period from the production of a developed device to the assembly of the whole machine is shortened from the original plan to 120 days to 35 days;
due to the adoption of the technology, the development cost is reduced to 9 ten thousand yuan (without the charge of a CCD) from 25 ten thousand yuan of the traditional optical path;
it should be noted that the above-mentioned contents only illustrate the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and it is obvious to those skilled in the art that several modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations fall within the protection scope of the claims of the present invention.
Claims (1)
1. A design method of a miniaturized multi-core transceiving laser communication device based on a variable optical axis aims at the following miniaturized multi-core transceiving laser communication device based on the variable optical axis, and comprises a signal light emitting optical path, a beacon light emitting optical path, a signal light receiving optical path and a beacon light receiving optical path, and is characterized in that a multi-core optical fiber coupler is adopted in the signal light receiving optical path and is coupled to the end face of a multi-core optical fiber, the multi-core optical fiber coupler comprises a plurality of single-mode optical fiber cores and a plurality of multi-mode optical fiber cores which are arranged in a unified optical fiber cladding, wherein each single-mode optical fiber core and each multi-mode optical fiber core are respectively connected into a corresponding signal light detector through a corresponding optical fiber filter to form a multi-channel signal light receiving optical path;
the miniaturized multicore receiving and dispatching laser communication device based on variable optical axis comprises a beam expanding antenna, a first quick reflector, a dichroic mirror, a first spectroscope, a receiving beacon optical lens group, a beacon optical detector, a second quick reflector, a multicore optical fiber coupler, an optical fiber filter, a signal detector, a third quick reflector, a second spectroscope, a transmitting beacon optical lens group, a beacon laser, a transmitting signal optical lens group and a signal laser, wherein:
signal light emission optical path: the signal light laser emits signal light, the signal light is shaped by the signal light emitting mirror group, then is combined with the beacon beam by the beam splitter II, is combined with the received light beam by the fast reflector III and the dichroic mirror, and enters the beam expanding antenna by the fast reflector I to form a signal light emitting optical path;
beacon light emission light path: the beacon light laser emits beacon light, the beacon light is shaped by the beacon light emitting mirror group, then is combined with the signal light by the spectroscope II, is combined with the received light beam by the quick reflector III and the color separation mirror, and enters the beam expanding antenna by the quick reflector I to form a beacon light emitting light path;
beacon receiving optical path: the beam expanding antenna enters a terminal, is shaped and compressed, then is reflected by a first quick reflector and a dichroic mirror to separate the reflected wavelength, is subjected to power or wavelength separation by a first spectroscope, and is focused on a focal plane of a beacon light detector by a beacon light receiving lens group to form a beacon light receiving light path;
signal light receiving optical path: the beam expanding antenna enters a terminal, is shaped and compressed, then is reflected by a first quick reflector and a dichroic mirror to separate the reflected wavelengths, and a first spectroscope is used for separating power or wavelength;
the method is characterized by comprising the following steps of but not limited to:
(a) Selecting a multi-core optical fiber coupler according to design requirements, wherein the multi-core optical fiber coupler comprises a plurality of single-mode optical fiber cores and a plurality of multi-mode optical fiber cores which are arranged in a unified optical fiber cladding; in the multi-core fiber coupler, A is a polarization maintaining fiber, B is a single mode fiber, and K is a multi-mode fiber with radius r A 、r B 、r K The distances among AB, AK and BK are d1, d2 and d3 respectively, the minimum value of numerical aperture NA of A, B and K fiber core is used as the design basis in the design, the multi-core fiber coupler L is designed, and the following requirements are met:
wherein D is the beam diameter of the incident end of the multi-core fiber coupler;
(b) Selecting a second quick reflector according to the multi-core fiber coupler focal length obtained in the step (a), wherein the corresponding deflection range M needs to meet the following requirements:
(c) An optical fiber filter: selecting an optical fiber filter conforming to an ITU protocol according to the wavelength of the signal light, and performing narrow-band filtering on the signal light input by the photoelectric detector, wherein the smaller the filtering bandwidth is, the better the filtering bandwidth is under the same condition;
(d) A photoelectric detector: selecting different multi-core fibers according to the requirements of different communication systems, selecting a PM polarization maintaining fiber for a coherent communication terminal, selecting a single-mode fiber for a high-speed incoherent communication terminal, and selecting a multi-mode fiber for a low-speed incoherent communication terminal;
(e) During use, calibration is needed to be carried out firstly, and the specific method for calibration is as follows:
a 17-angle reflecting prism is inserted between the dichroic mirror and the first spectroscope, the 10-u i signal light detector is replaced by the signal light laser respectively and emits light, and the light beam reflects the beacon light receiving light path after passing through the angle reflecting prism and forms an image on the beacon light detector;
adjusting the second quick reflector to enable the spot coordinates output by the different signal light detectors on the focal plane of the beacon light detector to correspond to the communication central point of the communication terminal, and respectively recording the deflection values (X) of the second quick reflector when the different signal light detectors output Ai 、Y Ai )，(X Bi 、Y Bi )，(X Ki 、Y Ki ) Respectively corresponding to a polarization maintaining fiber A, a single mode fiber B and a multimode fiber K in the multi-core fiber coupler;
in the terminal work, according to the work required to be completed in the work, the second quick reflector is controlled to be respectively pre-biased (X) Ai 、Y Ai )/(X Bi 、Y Bi )/(X Ki 、Y Ki ) The switching of the signal light receiving beam can be completed.
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