CN114710207A - Wavelength self-adaptive matching terminal, system and method applied to multi-wavelength free matching laser communication - Google Patents
Wavelength self-adaptive matching terminal, system and method applied to multi-wavelength free matching laser communication Download PDFInfo
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Abstract
A wavelength self-adaptive matching terminal, a system and a method applied to multi-wavelength free matching laser communication belong to the technical field of laser communication. The invention solves the problem that the wavelength in the laser communication terminal of the existing multi-wavelength matching communication network system can not be freely matched. The terminal comprises a multi-wavelength transmitting module and a multi-wavelength receiving module, wherein the multi-wavelength transmitting module can transmit laser signals with at least two wavelengths, the multi-wavelength receiving module can receive the laser signals with any wavelength transmitted by the multi-wavelength transmitting module, the multi-wavelength receiving module can acquire wavelength data of the multi-wavelength receiving module according to the received laser signals and transmit the wavelength data to the multi-wavelength transmitting module, and the multi-wavelength transmitting module can transmit the laser signals with corresponding wavelengths according to the received wavelength data.
Description
Technical Field
The invention relates to the technical field of laser communication, in particular to a wavelength self-adaptive matching terminal, system and method applied to multi-wavelength free matching laser communication.
Background
The space laser communication has the characteristics of high communication speed and strong anti-interference capability, but because the communication laser beam divergence angle is small, in order to ensure the isolation degree of the receiving and transmitting of the system during duplex communication, the receiving and transmitting laser of the laser communication system mostly adopts a configuration mode of different wavelengths in the same wave band, and the receiving and transmitting isolation of the system is realized by combining a narrow-band optical filter with the corresponding wavelength, which requires that the laser wavelengths received and transmitted by two communication parties are strictly corresponding, so that two communication terminals have a strict wavelength matching relationship. Therefore, in practical applications, many scenarios require duplex communication capability between two or more laser communication terminals, so that one point can communicate with different nodes.
Therefore, the existing multi-wavelength matching communication network system has the following defects: wavelength matching between any communication network systems cannot be realized, namely free pairing communication cannot be completed.
In summary, although the conventional multi-wavelength matching communication network system can achieve the purpose of laser communication, it still cannot complete free pairing communication.
Therefore, in the prior art, free pairing cannot be completed for the wavelengths in the laser communication terminal of the existing multi-wavelength matching communication network system, such as: patent document CN112543059A discloses a "common receiving optical path wireless laser communication networking antenna", in which multiple tracking and aiming units and communication and detection units are connected by a common optical unit, and the tracking and aiming units and the communication and detection units are flexibly matched according to the spatial position and communication wavelength of a communication target, so as to realize simultaneous communication with multiple targets. The technical solution described in this patent document can only solve the problem of matching the tracking and aiming unit and the communication and detection unit, and does not explicitly provide a technical solution that the laser communication cannot complete the free pairing communication. Patent document CN113839714A discloses "a space laser communication terminal integrating communication light transmission and reception", which uses communication light instead of beacon light to realize a common light path for transmission and reception, thereby greatly simplifying the structure of the light path for transmission and reception. The patent document can greatly simplify the structure of a transmitting and receiving optical path, and the technical scheme of the patent document can not provide a solution for the problem that free pairing cannot be completed in laser communication.
In the prior art, von et al published a thesis "routing and path-finding of multi-wavelength all-optical ring network and wavelength allocation algorithm" in 2001, 08, a multi-wavelength correlation technique is proposed for a wired optical communication system, and the related technique is mainly to obtain transmitted and received laser wavelengths through a matching algorithm on the premise of known optical signal wavelengths, and then to realize communication by controlling a receiving end and a transmitting end to be simultaneously switched to matched wavelengths through a control method. However, this method needs to first obtain the wavelength of light for communication, then obtain the wavelengths of the transmitting and receiving ends through a matching algorithm, and finally synchronously control the wavelengths of the two. First, the method is applicable only to wired optical communication systems, not to wireless communication systems; secondly, the method needs to know the wavelength for communication first; finally, this method requires complex algorithms to obtain the wavelengths of the transmitting and receiving ends.
In a wireless laser communication system of a free network, in order to ensure that any two terminals can carry out laser communication at any time, the terminals are required to be provided with at least two laser receiving and transmitting wavelength combinations, the laser communication and the laser receiving adopt different wavelengths, and the respective laser receiving and transmitting wavelength combination is selected by the two terminals to ensure that the receiving and transmitting wavelengths between the two terminals are consistent, thereby realizing full-duplex communication and simultaneously ensuring the communication receiving and transmitting isolation of the terminals. Since there are no other auxiliary communication links except the laser link between the two laser communication terminals, before the laser communication link is established, the two communication terminals cannot transmit information, and cannot know the wavelength combination state of the other party, and cannot determine the wavelength combination of the laser receiving and transmitting of the other party, which causes that the laser link cannot be established between the two terminals, and communication cannot be performed. Therefore, in a free-form networking laser communication system with a plurality of wavelength combinations, how to realize the wavelength adaptive matching of the system under the condition of no auxiliary communication becomes a key problem of establishing a communication link of the system, and is a precondition for whether the system can realize laser communication.
Disclosure of Invention
The invention solves the problem that the wavelength in the laser communication terminal of the existing multi-wavelength matching communication network system can not finish free pairing.
The terminal comprises a multi-wavelength transmitting module and a multi-wavelength receiving module, wherein the multi-wavelength transmitting module can transmit laser signals with at least two wavelengths, the multi-wavelength receiving module can receive the laser signals with any wavelength transmitted by the multi-wavelength transmitting module, the multi-wavelength receiving module can acquire wavelength data of the multi-wavelength receiving module according to the received laser signals and transmit the wavelength data to the multi-wavelength transmitting module, and the multi-wavelength transmitting module can transmit the laser signals with corresponding wavelengths according to the received wavelength data.
Further, in an embodiment of the present invention, the multi-wavelength emission module includes a multi-wavelength laser signal emission part capable of emitting laser signals of at least two wavelengths, and an optical switch for selecting an input laser signal emission output of a corresponding wavelength according to received wavelength data.
Further, in an embodiment of the present invention, the multi-wavelength laser signal transmitting part includes at least two laser transmitters, each for transmitting a laser signal of one wavelength.
Further, in an embodiment of the present invention, the multi-wavelength receiving module includes a receiving lens, a filtering rotation structure and a receiving detector, the filtering rotation structure can filter laser signals with different wavelengths by rotation, the laser signals received by the receiving lens are transmitted to the filtering rotation structure, filtered by the filtering rotation structure and output to the receiving detector, and the receiving detector outputs wavelength data to the multi-wavelength transmitting module.
Further, in an embodiment of the present invention, the multi-wavelength receiving module further includes a filtering rotation structure control component, the filtering rotation structure control component is configured to control the filtering rotation structure to rotate at a constant speed, and further configured to control the filtering rotation structure to rotate to a position where the laser signal capable of transmitting the wavelength data can be transmitted and stop when receiving the wavelength data, and the receiving detector further transmits the wavelength data to the filtering rotation structure control component.
Further, in an embodiment of the present invention, the filtering rotation structure includes a narrowband filter rotation disc and a plurality of narrowband filters, a plurality of through holes are uniformly distributed on the narrowband filter rotation disc along a circumference, the number of the through holes is 1 more than that of the narrowband filters, one narrowband filter is embedded and fixed in each through hole, and the through holes in which the narrowband filters are not embedded are neutral positions.
Further, in an embodiment of the present invention, the filtering rotation structure includes a narrowband filter rotation disc and a plurality of narrowband filters, a plurality of through holes are uniformly distributed on the narrowband filter rotation disc along a circumference, the number of the through holes is twice of the number of the narrowband filters, the plurality of narrowband filters are uniformly distributed and fixed in the through holes, and a through hole is left between two adjacent narrowband filters as a neutral position.
The invention relates to a multi-wavelength free matching laser communication system, which comprises two terminals, namely a terminal A and a terminal B, wherein the terminal is any one of the wavelength self-adaptive matching terminals in the method.
The invention discloses a multi-wavelength free matching communication method applied to a multi-wavelength free matching laser communication system, which comprises the following steps:
the filtering rotating structures in the terminal A and the terminal B rotate to a neutral position, so that the laser signals received by the receiving lens can be directly transmitted to an optical signal receiving end of the receiving detector;
carrying out initial alignment on the terminal A and the terminal B;
the terminal A selects a laser signal with one wavelength to emit and output through an optical switch in the terminal A;
after receiving the laser signal, the terminal B controls the internal filtering rotating structure to rotate, and controls the filtering rotating structure to stop at a specified position according to the change of the optical signal received by the receiving detector, so that an optical filter in the filtering rotating structure, which is adaptive to the wavelength of the received laser signal, is positioned between the receiving lens and the receiving detector, and the optical filter selection of the terminal B is completed;
the terminal B controls a fling-cut switch inside the terminal B to select the laser signal with the corresponding wavelength to be transmitted according to the wavelength of the received laser signal;
after receiving the laser signal, the terminal A controls the internal filtering rotating structure to rotate, and controls the filtering rotating structure to stop at a specified position according to the change of the optical signal received by the receiving detector, so that an optical filter in the filtering rotating structure, which is adaptive to the wavelength of the received laser signal, is positioned between the receiving lens and the receiving detector, and the optical filter selection of the terminal A is completed; and realizing the establishment of the communication link between the terminal A and the terminal B.
Further, in an embodiment of the present invention, the method for performing initial alignment between the terminal a and the terminal B includes: and adjusting a receiving lens of the terminal A to enable a receiving detector in the terminal A to receive the laser signal sent by the terminal B, and then adjusting the receiving lens of the terminal B to enable the terminal B to receive the laser signal sent by the terminal A to complete primary alignment.
The invention solves the problem that the wavelength in the laser communication terminal of the existing multi-wavelength matching communication network system can not finish free pairing. The method has the following specific beneficial effects:
the wavelength self-adaptive matching terminal applied to multi-wavelength free matching laser communication has the advantages that:
1. the multi-wavelength transmitting module and the multi-wavelength receiving module can respectively realize the transmission and the reception of multi-wavelength laser signals, and the multi-wavelength receiving module can automatically identify the wavelength of the received laser signals and then adjust the multi-wavelength transmitting module to transmit the laser signals with corresponding wavelengths, so that the automatic wavelength adjustment is realized.
2. The multi-wavelength receiving module in the terminal adopts a filtering rotary structure to realize the function of automatically identifying the wavelength of the received laser signal, and has simple structure and accurate identification. And the narrow-band filter can automatically identify the wave band of the received communication laser signal and then match the wave band of the corresponding laser signal according to the wave band of the received communication laser signal.
3. The multi-wavelength transmitting module in the terminal adopts the optical switch to realize the selection of the wavelength of the transmitted laser signal, thereby automatically realizing the automatic matching of the wavelength of the transmitted laser signal.
Two narrow-band filters are mounted on the narrow-band filter rotating disc of the terminal and are mounted at intervals, and a neutral position is designed in the middle of the narrow-band filter rotating disc, so that laser can directly pass through the narrow-band filter rotating disc, and the filters of the device can achieve laser receiving and transmitting isolation.
The invention provides a wavelength self-adaptive matching terminal applied to multi-wavelength free matching laser communication, a laser emitting device adopts an optical switch to switch wavelength, the volume and weight of a switching structure can be reduced, the switching speed is high, the reliability is realized, and no mechanical structure is involved, so that the laser emitting efficiency and the consistency of an optical axis after switching can be ensured.
In the invention, the terminal for receiving signals can automatically identify the wavelength of the received laser signal and adjust the laser signal with the corresponding wavelength emitted by the terminal, and the terminal can work autonomously without personnel participation in the process, can be installed for communication, and effectively solves the problem of low working efficiency when two terminals are in communication.
The invention provides a wavelength self-adaptive matching terminal applied to multi-wavelength free matching laser communication, and the number of laser transmitters and narrow-band filters of the terminal is not increased by additionally increasing hardware structures, and the complexity of a system is not increased.
The invention is suitable for the technical field of space laser communication and solves the technical problem of multi-wavelength receiving free matching in space laser communication free networking.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a system applied to multi-wavelength free matching laser communication according to a first embodiment.
FIG. 2 is a terminal group diagram according to a third embodiment; the device comprises a multi-wavelength transmitting module 1, a multi-wavelength receiving module 2, a first laser device 3, a second laser device 4, an optical switch 5, a transmitting lens 6, a receiving lens 7, a narrow-band optical filter rotating disk 8 and a receiving detector 11.
Fig. 3 is a structure diagram of a narrowband filter rotating disk according to the sixth embodiment, and fig. 9 is a narrowband filter.
Detailed Description
Various embodiments of the present invention will now be described more fully hereinafter with reference to the accompanying drawings. The embodiments described by referring to the drawings are exemplary for the purpose of illustrating the invention and are not to be construed as limiting the invention.
The terminal comprises a multi-wavelength transmitting module 1 and a multi-wavelength receiving module 2, wherein the multi-wavelength transmitting module 1 can transmit laser signals with at least two wavelengths, the multi-wavelength receiving module 2 can receive the laser signals with any one wavelength transmitted by the multi-wavelength transmitting module 1, the multi-wavelength receiving module 2 can acquire wavelength data of the received laser signals and transmit the wavelength data to the multi-wavelength transmitting module 1, and the multi-wavelength transmitting module 1 can transmit the laser signals with corresponding wavelengths according to the received wavelength data.
In this embodiment, as shown in fig. 1, the adaptive matching terminal is composed of a multi-wavelength transmitting module 1 and a multi-wavelength receiving module 2, the multi-wavelength receiving module 2 can receive a laser signal with any wavelength transmitted by the multi-wavelength transmitting module 1, the multi-wavelength receiving module 2 can obtain wavelength data of the laser signal according to the received laser signal and transmit the wavelength data to the multi-wavelength transmitting module 1, and the multi-wavelength transmitting module 1 can transmit a laser signal with a corresponding wavelength according to the received wavelength data, thereby implementing adaptive adjustment of the wavelength of the transmitted laser signal according to the wavelength of the received laser signal.
In the second embodiment, the multi-wavelength emission module 1 includes a multi-wavelength laser signal emission unit capable of emitting laser signals of at least two wavelengths, and an optical switch 5, the multi-wavelength laser signal emission unit emits the laser signals to the optical switch 5, and the optical switch 5 is configured to select an input laser signal emission output of a corresponding wavelength according to received wavelength data.
In this embodiment, the multi-wavelength laser signal emitting component of the multi-wavelength emitting module 1 can emit laser signals of at least two wavelengths, and then the selection of the wavelength of the emitted laser signal is realized through the optical switch 5, the terminal can reduce the volume and weight of the switching structure by using the optical switch 5, the switching speed is high, the reliability is high, and no mechanical structure is involved, which is beneficial to ensuring the laser emission efficiency and the consistency of the optical axis after switching.
In a third embodiment, the multi-wavelength laser signal transmitting component includes at least two laser transmitters, and each laser transmitter is configured to transmit a laser signal of one wavelength.
The multi-wavelength laser signal transmitting component in the present embodiment is implemented by using a plurality of laser transmitters, as shown in fig. 2, the multi-wavelength laser signal transmitting component includes two laser transmitters 3 and 4, the two laser transmitters 3 and 4 are respectively used for transmitting laser signals of different wave bands, the transmitted laser signals are selected by an optical switch 5 and then output laser signals of one wavelength, and the laser signals are output by an emitting lens 6, so that adaptive communication adjustment of the laser signals of two wavelengths is implemented.
In a fourth embodiment, the multi-wavelength receiving module 2 includes a receiving lens 7, a filter rotation structure and a receiving detector 11, the filter rotation structure is capable of filtering laser signals with different wavelengths by rotation, the laser signals received by the receiving lens 7 are transmitted to the filter rotation structure, the laser signals are filtered by the filter rotation structure and then output to the receiving detector 11, and the receiving detector 11 outputs wavelength data to the multi-wavelength transmitting module 1.
In the present embodiment, as shown in fig. 2, a filter rotating structure is attached to the rear end of the receiving lens 7, and a receiving probe 11 is attached to the rear end of the filter rotating structure.
When the multi-wavelength receiving module 2 receives a laser signal, the laser signal is transmitted to the filtering rotating structure, and the identification of the wavelength of the laser signal is realized through the filtering rotating structure and the receiving detector 11 behind the filtering rotating structure, specifically, the laser rotating structure can respectively transmit the laser signals with different wavelengths in the rotating process, when the wavelength which can be transmitted is the same as the wavelength of the received laser signal, the laser signal is transmitted and received by the receiving detector 11, so that the wavelength of the received laser signal is determined, and finally, the self-adaptive adjustment of the wavelength of the laser signal transmitted by the multi-wavelength transmitting module 1 is realized.
The first laser emitter 3 and the second laser emitter 4 at the transmitting end of the multi-wavelength receiving module 2 are designed to be different laser wavelengths, and the transmitting laser wavelengths can be selected adaptively. Although the structural composition of the transmitting ends of the multi-wavelength transmitting module 1 and the multi-wavelength receiving module 2 is consistent, in the device, the multi-wavelength transmitting module 1 is used as the transmitting end to input the waveband of a laser signal to the receiving end of the multi-wavelength receiving module 2, the filtering rotating structure of the receiving end can be self-adaptive and judge the laser signal of the waveband, and the transmitting end of the multi-wavelength receiving module 2 outputs the laser signal of the other waveband matched with the laser signal of the waveband according to the judged waveband laser signal.
In a fifth embodiment, the multi-wavelength receiving module 2 further includes a filter rotating structure control unit configured to control the filter rotating structure 8 to rotate at a constant speed, and further configured to control the filter rotating structure to rotate to a position where the laser signal of the wavelength data can be transmitted and stop when the wavelength data is received, and the receiving detector 11 further transmits the wavelength data to the filter rotating structure control unit.
Sixth embodiment, the present embodiment is further limited to the fourth embodiment in that the filter rotating structure includes a narrowband filter rotating disk and a plurality of narrowband filters 9, the narrowband filter rotating disk is provided with a plurality of through holes uniformly distributed along a circumference, the number of the through holes is 1 more than at least the number of the narrowband filters 9, one narrowband filter 9 is embedded and fixed in each through hole, and the through hole in which the narrowband filter 9 is not embedded is a neutral position.
In practical application, the number of the through holes may be designed to be twice the number of the narrowband filters 9, and then the plurality of narrowband filters 9 are uniformly distributed and fixed in the plurality of through holes, that is: a through hole is left between two adjacent narrow-band filters 9, for example: 4 through holes and 2 narrow-band filters 9 are designed, as shown in fig. 3, a through hole is reserved between the two narrow-band filters 9 and is a neutral position, so that direct transmission of laser signals is realized, and the through hole between the two narrow-band filters 9 can realize the isolation of laser receiving and transmitting. The structure is provided with the two narrow-band filters 9, so that the identification of laser signals with two wavelengths can be realized, and the effect of personnel participation is not needed.
And the narrow-band filter can automatically identify the wave band of the received communication laser signal and then match the wave band of the corresponding laser signal according to the wave band of the received communication laser signal.
In a seventh embodiment, the multi-wavelength free matching laser communication system according to the first to sixth embodiments includes two terminals, namely a terminal a and a terminal B, and the terminals are any one of the wavelength adaptive matching terminals according to the first to sixth embodiments.
In this embodiment, after the terminal a transmits a laser signal with a certain wavelength, the receiving module of the terminal B performs automatic wavelength identification on the received laser signal, then adjusts the transmitting module of the terminal B to transmit the laser signal with a corresponding wavelength for feedback, and finally, the receiving module of the terminal a receives and identifies the transmitting module of the terminal B to transmit the corresponding wavelength, thereby completing the adaptive adjustment of the laser signal of the communication system.
An eighth embodiment is a multi-wavelength free matching communication method applied to the multi-wavelength free matching laser communication system according to the seventh embodiment, and the multi-wavelength free matching communication method includes:
the filtering rotating structures in the terminal A and the terminal B rotate to a neutral position, so that the laser signals received by the receiving lens can be directly transmitted to an optical signal receiving end of the receiving detector;
carrying out initial alignment on the terminal A and the terminal B;
the terminal A selects a laser signal with one wavelength to emit and output through an optical switch in the terminal A;
after receiving the laser signal, the terminal B controls the internal filtering rotating structure to rotate, and controls the filtering rotating structure to stop at a specified position according to the change of the optical signal received by the receiving detector, so that an optical filter in the filtering rotating structure, which is adaptive to the wavelength of the received laser signal, is positioned between the receiving lens and the receiving detector, and the optical filter selection of the terminal B is completed;
the terminal B controls a fling-cut switch inside the terminal B to select the laser signal with the corresponding wavelength to be transmitted according to the wavelength of the received laser signal;
after receiving the laser signal, the terminal A controls the internal filtering rotating structure to rotate, and controls the filtering rotating structure to stop at a specified position according to the change of the optical signal received by the receiving detector, so that an optical filter in the filtering rotating structure, which is adaptive to the wavelength of the received laser signal, is positioned between the receiving lens and the receiving detector, and the optical filter selection of the terminal A is completed; and establishing a communication link between the terminal A and the terminal B.
In the embodiment, the received communication laser wavelength is identified by adopting optical filter switching, and then the communication transmitting laser wavelength matched with the optical filter switching is adopted according to a preset wavelength matching scheme, so that the communication receiving and transmitting wavelengths of the two terminals are automatically and independently matched. In a communication network system, two terminal receiving ends are respectively provided with two narrow-band filters, because each narrow-band filter can only allow laser of one wave band to pass through for laser of different wave bands, different narrow-band filters are required to be selected when the laser of different wave bands is received.
The number of the laser transmitters and the narrow-band filters is not increased by additional hardware structures, and too many devices not only increase the complexity of the system, but also increase the volume.
Ninth, the present embodiment is to further limit the multi-wavelength free matching communication method applied to the multi-wavelength free matching laser communication system according to the eighth embodiment, and in the present embodiment, the method of performing the initial alignment of the terminal a and the terminal B is: and adjusting a receiving lens of the terminal A to enable a receiving detector in the terminal A to receive the laser signal sent by the terminal B, and then adjusting the receiving lens of the terminal B to enable the terminal B to receive the laser signal sent by the terminal A to complete primary alignment.
An eighth embodiment is a multi-wavelength free matching communication method applied to a multi-wavelength free matching laser communication system, according to the eighth embodiment, wherein the method of controlling the filter rotating structure to stop at a predetermined position according to a change in an optical signal received by the receiving detector includes:
before the filtering rotating structure rotates, a receiving detector can receive a laser signal;
and after the filtering rotary structure rotates, detecting the laser signal received by the receiving detector in real time, and when the filtering rotary structure receives the laser signal again, controlling the filtering rotary structure to stop rotating.
The eleventh embodiment provides an actual embodiment based on the wavelength adaptive matching method applied to multi-wavelength free matching laser communication according to the present invention, in combination with a specific object: a wavelength self-adaptation matching method applied to multi-wavelength free matching laser communication is characterized in that a 1550nm waveband is selected for communication laser, the wavelength is designed to be 1530nm and 1550nm which can be communicated, free matching communication between any two terminals can be achieved through wavelength switching, and laser communication among a plurality of nodes is facilitated; the wavelength of the first laser emitter 3 at the emitting end of the terminal A is designed to be 1530nm, the wavelength of the second laser emitter 4 at the emitting end of the terminal B is designed to be 1550nm, the cut-off frequency of the narrow-band filter 9 of the terminal A is 1530 +/-5 nm, and the cut-off frequency of the narrow-band filter 9 of the terminal B is 1550 +/-5 nm.
A wavelength self-adaptive matching method applied to multi-wavelength free matching laser communication comprises the following steps:
step S1: rotating the narrowband filter rotating disk 8 of the terminal A and the narrowband filter rotating disk 8 of the terminal B to a neutral position to ensure that the laser received by the receiving lens 7 of the first terminal 1 can directly irradiate the receiving detector 11 and the laser received by the receiving lens 7 of the terminal B can directly irradiate the receiving detector 11;
step S2: after the terminal A and the terminal B finish the initial alignment, the terminal A opens the first laser transmitter 3 to transmit laser with the wavelength of 1530nm, and the terminal A switches the optical selector switch 5 to enable the laser with the wavelength of 1530nm to be transmitted out through the transmitting lens 6;
step S3: after a receiving detector 11 of the terminal B receives the laser, rotating the narrow-band optical filter rotating disc 8 to switch the narrow-band optical filter, and monitoring the change of a receiving signal of the receiving detector 11;
step S4: when the terminal B is switched to the narrow-band filter 9, the receiving detector 11 can still receive the laser signal, the narrow-band filter rotating disc 8 stops rotating, and the terminal B judges that the wavelength of the laser emitted by the terminal A is 1530 nm;
step S5: the terminal B opens the first laser emitter 3 matched with the wavelength of the laser emitted by the terminal A, switches the light to the light 5, and enables the laser with the wavelength of 1550nm of the first laser emitter 3 to be emitted through the emission lens 6;
step S6: after a receiving lens 7 of the terminal A receives laser emitted by the terminal B, the laser passes through a neutral position of a narrowband optical filter rotating disc 8 of the terminal A and is received by a receiving detector 11;
step S7: and the terminal A rotates the narrow-band filter rotating disc 8 to switch the narrow-band filter, simultaneously monitors the change of the signal received by the receiving detector 11, and when the narrow-band filter 9 is switched, the receiving detector 11 can still receive the signal, so that the two terminals finish the matching between the transmitting laser and the receiving narrow-band filter, and the link establishment is realized.
Through the steps, the communication wavelengths of the two laser communication terminals do not need to be set in advance, the communication wavelengths can be matched in a free self-adaptive mode when a laser communication optical link is established, and high-isolation full-duplex laser communication of any two terminals is achieved.
In this embodiment, the laser signal of a wavelength band at the transmitting end of the terminal a is output, the laser signal of a wavelength band output by the transmitting end of the terminal a is input to the receiving end of the terminal B, the receiving lens 7 at the receiving end of the terminal B sends the input laser signal of a wavelength band to the input end of the filtering rotary structure, the input end of the filtering rotary structure can adapt to and determine the wavelength of the laser signal, and the information of the laser signal is sent to the input end of the receiving detector 11 from the output end of the filtering rotary structure, so that the receiving end of the terminal B receives the laser signal of a wavelength band output by the transmitting end of the terminal a.
The first laser emitter 3 and the second laser emitter 4 at the transmitting end of the terminal B are designed to be different laser wavelengths, and the transmitting laser wavelengths can be selected adaptively. Although the structural composition of the transmitting ends of the terminal A and the terminal B is consistent, in the device, the terminal A is used as the transmitting end to input the wave band of a laser signal into the receiving end of the terminal B, the filtering rotating structure of the receiving end can be self-adaptive and judge the laser signal of the wave band, and the transmitting end of the terminal B outputs the laser signal of the other wave band matched with the laser signal of the wave band according to the judged laser signal of the wave band.
The transmitting end of the terminal B outputs the laser signal of the other waveband matched with the input laser signal of the one waveband, and the laser signal is directly output by the output end of the transmitting lens 6.
The receiving end of the terminal a inputs the laser signal of the other waveband output by the transmitting end of the terminal B, and the laser signal of the other waveband is a laser signal matched with the laser signal of the one waveband output by the transmitting end of the terminal a, that is, because the laser signal of the one waveband output by the transmitting end of the terminal a and the laser signal of the one waveband input by the receiving end of the terminal B are laser signals of one waveband, the laser signal of the other waveband is a laser signal matched with the laser signal of the one waveband input by the receiving end of the terminal B. After the laser signal of another waveband input by the input end of the receiving end of the terminal a is adaptive through the input end of the filtering rotating structure, the matched laser signal of another waveband is sent to the input end of the receiving detector 11, so that the receiving end of the terminal a inputs the laser signal of another waveband output by the transmitting end of the terminal B.
Claims (10)
1. A wavelength self-adaptive matching terminal applied to multi-wavelength free matching laser communication is characterized in that the terminal comprises a multi-wavelength transmitting module (1) and a multi-wavelength receiving module (2), the multi-wavelength transmitting module (1) can transmit laser signals of at least two wavelengths, the multi-wavelength receiving module (2) can receive the laser signals of any one wavelength transmitted by the multi-wavelength transmitting module (1), the multi-wavelength receiving module (2) can acquire wavelength data of the multi-wavelength receiving module according to the received laser signals and transmit the wavelength data to the multi-wavelength transmitting module (1), and the multi-wavelength transmitting module (1) can transmit the laser signals of corresponding wavelengths according to the received wavelength data.
2. The wavelength adaptive matching terminal according to claim 1, wherein the multi-wavelength transmitting module (1) comprises a multi-wavelength laser signal transmitting part capable of transmitting laser signals of at least two wavelengths and an optical switch (5), the multi-wavelength laser signal transmitting part transmits the laser signals to the optical switch (5), and the optical switch (5) is configured to select an input laser signal transmission output of a corresponding wavelength according to the received wavelength data.
3. The wavelength adaptive matching terminal according to claim 2, wherein the multi-wavelength laser signal transmitting component comprises at least two laser transmitters, each for transmitting a laser signal of one wavelength.
4. The terminal according to claim 1, wherein the multi-wavelength receiving module (2) comprises a receiving lens (7), a filtering rotary structure and a receiving detector (11), the filtering rotary structure is capable of filtering laser signals with different wavelengths by rotation, the laser signals received by the receiving lens (7) are transmitted to the filtering rotary structure, the filtered laser signals are output to the receiving detector (11), and the receiving detector (11) outputs wavelength data to the multi-wavelength transmitting module (1).
5. The wavelength adaptive matching terminal according to claim 4, wherein the multi-wavelength receiving module (2) further comprises a filtering rotating structure control part for controlling the filtering rotating structure (8) to rotate at a constant speed and for controlling the filtering rotating structure to rotate to a position where the laser signal of the wavelength data can be transmitted and stop when the wavelength data is received, and the receiving detector (11) further transmits the wavelength data to the filtering rotating structure control part.
6. The wavelength adaptive matching terminal according to claim 4, wherein the filter rotating structure comprises a narrowband filter rotating disc and a plurality of narrowband filters (9), a plurality of through holes are uniformly distributed on the narrowband filter rotating disc along the circumference, the number of the through holes is 1 more than that of the narrowband filters (9), one narrowband filter (9) is embedded and fixed in each through hole, and the through holes without the narrowband filters (9) are in a neutral position.
7. The wavelength adaptive matching terminal according to claim 4, wherein the filter rotating structure comprises a narrowband filter rotating disk and a plurality of narrowband filters (9), the narrowband filter rotating disk is provided with a plurality of through holes uniformly distributed along a circumference, the number of the through holes is twice that of the narrowband filters (9), the plurality of narrowband filters (9) are uniformly distributed and fixed in the through holes, and a through hole is left between two adjacent narrowband filters (9) as a neutral position.
8. A multi-wavelength free matching laser communication system, wherein the communication system comprises two terminals, namely a terminal a and a terminal B, and the terminal is the wavelength adaptive matching terminal according to any one of claims 1 to 7.
9. The multi-wavelength free matching communication method applied to the multi-wavelength free matching laser communication system as claimed in claim 8, wherein the multi-wavelength free matching communication method comprises:
the filtering rotating structures in the terminal A and the terminal B rotate to a neutral position, so that the laser signals received by the receiving lens can be directly transmitted to an optical signal receiving end of the receiving detector;
carrying out initial alignment on the terminal A and the terminal B;
the terminal A selects a laser signal with one wavelength to emit and output through an optical switch in the terminal A;
after receiving the laser signal, the terminal B controls the internal filtering rotating structure to rotate, and controls the filtering rotating structure to stop at a specified position according to the change of the optical signal received by the receiving detector, so that an optical filter in the filtering rotating structure, which is adaptive to the wavelength of the received laser signal, is positioned between the receiving lens and the receiving detector, and the optical filter selection of the terminal B is completed;
the terminal B controls a fling-cut switch inside the terminal B to select the laser signal with the corresponding wavelength to be transmitted according to the wavelength of the received laser signal;
after receiving the laser signal, the terminal A controls the internal filtering rotating structure to rotate, and controls the filtering rotating structure to stop at a specified position according to the change of the optical signal received by the receiving detector, so that an optical filter in the filtering rotating structure, which is adaptive to the wavelength of the received laser signal, is positioned between the receiving lens and the receiving detector, and the optical filter selection of the terminal A is completed; and establishing a communication link between the terminal A and the terminal B.
10. The multi-wavelength free matching communication method applied to the multi-wavelength free matching laser communication system according to claim 9, wherein the method for performing the initial alignment between the terminal a and the terminal B comprises: and adjusting a receiving lens of the terminal A to enable a receiving detector in the terminal A to receive the laser signal sent by the terminal B, and then adjusting the receiving lens of the terminal B to enable the terminal B to receive the laser signal sent by the terminal A to complete primary alignment.
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