CN113411136A - Quadrature modulation secret optical communication device and method - Google Patents
Quadrature modulation secret optical communication device and method Download PDFInfo
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- CN113411136A CN113411136A CN202110667732.6A CN202110667732A CN113411136A CN 113411136 A CN113411136 A CN 113411136A CN 202110667732 A CN202110667732 A CN 202110667732A CN 113411136 A CN113411136 A CN 113411136A
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- H04B10/50—Transmitters
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- H04B10/541—Digital intensity or amplitude modulation
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- 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
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- 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
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/548—Phase or frequency modulation
- H04B10/556—Digital modulation, e.g. differential phase shift keying [DPSK] or frequency shift keying [FSK]
- H04B10/5561—Digital phase modulation
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Abstract
The invention provides an orthogonal modulation secret optical communication device and a method, wherein the device comprises a pulse light source generator, a signal modulation module, a time domain phase coding module, a transmission optical fiber, a time domain phase decoding module, a demodulation module and an arithmetic unit, wherein: the output end of the pulse light source generator is connected with the input end of the signal modulation module, the signal modulation module simultaneously performs phase and intensity modulation on an optical signal sent by the pulse light source generator, the output end of the signal modulation module is connected with the input end of the time domain phase coding module, the time domain phase coding module codes the modulated optical signal, the output end of the time domain phase coding module is connected with the input end of the transmission optical fiber, the output end of the transmission optical fiber is connected with the input end of the time domain phase decoding module, the output end of the time domain phase decoding module is respectively connected with the input end of the demodulation module and the input end of the arithmetic unit, the output end of the demodulation module outputs a demodulation signal, and the output end of the arithmetic unit outputs original signal intensity information.
Description
Technical Field
The invention relates to the technical field of secure optical secret communication, in particular to a quadrature modulation secret optical communication device and method.
Background
With the rapid development of modern communication technology, how to improve the security transmission performance of the physical layer of the communication system has received much attention. The purpose of the secure communication of the physical layer is to reduce the risk of eavesdropping on the information, and the process of the secure communication mainly includes encryption, transmission, reception and decryption. And the sender encrypts and transmits the information to be transmitted, and the transmitted encrypted information is received and decrypted at the receiver, so that the original information is finally recovered. Information is inevitably stolen, attacked and forged by an illegal eavesdropper in the transmission process. It is very disadvantageous for the legal receiver, so how to effectively improve the system security performance is a problem that both communication parties must consider.
Optical Code Division Multiple Access (OCDMA) is a solution for broadband optical access network, and the coherent Optical Code Division Multiple Access (OCDMA) technology adopting ultrashort pulses has the advantages of low multiple access interference, strong anti-interference capability, good confidentiality, large capacity and the like, and becomes an alternative technology for confidential optical communication. In coherent OCDMA systems, coherent optical coding and decoding is performed based on the phase and amplitude of the optical field. In a typical OCDMA system, optical pulses are encoded into a noise-like signal according to a unique optical code assigned to different users by an optical encoder on a transmitter, and multiple users may share the same transmission medium, such as time and frequency spectrum. In order to improve the safety performance of an optical coding and decoding system, a large number of technical methods are concentrated on a time domain or a frequency domain to process the optical phase of a coherent broadband optical signal, and the proposed coder/decoder comprises: superstructure fiber Bragg grating, planar lightwave circuit, micro-ring resonant cavity, etc. These conventional optical encoder/decoder codewords are typically fixed and have limited code lengths, while not providing the ability to be quickly reconfigured to accommodate the needs of secure communications. In addition, the conventional optical encoding and decoding secure communication system only uses basic modulation formats such as amplitude keying, frequency shift keying, phase shift keying and the like to perform data modulation, the spectral efficiency of the system is low, and the security performance of the system is closely related to the modulation format. For a single modulation format, the safety performance of the system cannot be guaranteed by optical coding through a traditional optical coding and decoding device.
Chinese patent publication No. CN107046463A, 08 and 15 in 2017, discloses a chaotic secure communication system based on a micro-ring resonator, which includes a laser connected to a first port of a splitter in sequence via an optical filter, an isolator and a polarization controller, the splitter splits continuous waves into two paths, wherein the first path: the second port of the splitter is connected with the first port of the differential amplifier sequentially through the first micro-ring resonant cavity, the wave combiner, the first erbium-doped fiber amplifier and the first PD detector; weak information enters a wave combiner and is combined with a chaotic signal from the first micro-ring resonant cavity into one path; and a second path: the third port of the splitter is connected with the second port of the differential amplifier through a second micro-ring resonant cavity, a second erbium-doped fiber amplifier and a second PD detector in sequence; signals from the first PD detector and the second PD detector enter a differential amplifier, information is recovered after subtraction, a third port of the differential amplifier is connected with a first port of an electric filter, and the two paths of information recovered after subtraction enter the differential amplifier and are output from a second port of the electric filter. This patent also fails to provide the capability of being quickly reconfigurable and difficult to accommodate for the needs of secure communications.
Disclosure of Invention
The invention aims to provide an orthogonal modulation secret optical communication device, which solves the problems that a traditional optical encoder/decoder cannot be reconstructed quickly and the system security and the spectral efficiency are low, and improves the spectral efficiency of the system while ensuring the security.
It is a secondary object of the present invention to provide a method of quadrature modulated secure optical communication.
In order to solve the technical problems, the technical scheme of the invention is as follows:
the utility model provides an orthogonal modulation secret optical communication device, includes pulse light source generator, signal modulation module, time domain phase coding module, transmission fiber, time domain phase decoding module, demodulation module and arithmetic unit, wherein:
the output of pulse light source generator with the input of signal modulation module is connected, signal modulation module is right the light signal that pulse light source generator sent carries out phase place and intensity modulation simultaneously, the output of signal modulation module with the input of time domain phase coding module is connected, time domain phase coding module encodes the light signal after the modulation, time domain phase coding module's output and transmission fiber's input are connected, transmission fiber's output with the input of time domain phase decoding module is connected, time domain phase decoding module's output is connected with demodulation module's input and the input of arithmetic unit respectively, demodulation module's output demodulation signal, the output of arithmetic unit exports original signal intensity information.
Preferably, the signal modulation module includes a QPSK modulator and a CSK modulator, wherein an output of the pulsed light source generator is connected to an input of the QPSK modulator, the QPSK modulator QPSK modulates an optical signal emitted by the pulsed light source generator, an output of the QPSK modulator is connected to an input of the CSK modulator, the CSK modulator performs CSK modulation on the QPSK modulated optical signal, the CSK modulator has two outputs, the time-domain phase coding module has two inputs, and two outputs of the CSK modulator are connected to two inputs of the time-domain phase coding module.
Preferably, the demodulation module includes a QPSK demodulator, wherein an output of the time domain phase decoding module is connected to an input of the QPSK demodulator, the QPSK demodulator performs QPSK demodulation on the optical signal, and an output of the QPSK demodulator outputs the QPSK-demodulated optical signal.
Preferably, the time domain phase coding module comprises a first single mode fiber, a second single mode fiber, a third single mode fiber, a fourth single mode fiber, a first phase modulator, a second phase modulator, a first PRBS generator and a second PRBS generator, wherein:
an input end of the first single-mode fiber is connected with one output end of the CSK modulator, an output end of the first single-mode fiber is connected with one input end of the first phase modulator, another input end of the first phase modulator is connected with an output end of the first PRBS generator, the first PRBS generator generates a first driving signal to drive the first phase modulator to generate a random optical phase, an output end of the first phase modulator is connected with an input end of the second single-mode fiber, and an output end of the second single-mode fiber is connected with the transmission fiber;
the input end of the third single-mode fiber is connected with the other output end of the CSK modulator, the output end of the third single-mode fiber is connected with one input end of the second phase modulator, the other input end of the second phase modulator is connected with the output end of the second PRBS generator, the second PRBS generator generates a second driving signal to drive the second phase modulator to generate a random optical phase, the output end of the second phase modulator is connected with the input end of the fourth single-mode fiber, and the output end of the fourth single-mode fiber is connected with the transmission fiber.
Preferably, the optical fiber coupling device further comprises a first optical coupler and a first beam splitter, the output end of the second single-mode fiber and the output end of the fourth single-mode fiber are coupled and input to the transmission fiber through the first optical coupler, the time domain phase decoding module has two input ends, the output end of the transmission fiber is decomposed into two beams of optical signals through the first beam splitter, and the two beams of optical signals are respectively input to the two input ends of the time domain phase decoding module.
Preferably, the time domain phase decoding module includes a fifth single mode fiber, a sixth single mode fiber, a seventh single mode fiber, an eighth single mode fiber, a third phase modulator, a fourth phase modulator, a third PRBS generator, and a fourth PRBS generator, wherein:
the input end of the fifth single-mode fiber inputs a bundle of optical signals decomposed by the first beam splitter, the output end of the fifth single-mode fiber is connected with one input end of the third phase modulator, the other input end of the third phase modulator is connected with the output end of the third PRBS generator, the third PRBS generator generates a third driving signal to drive the third phase modulator to generate a random optical phase, the output end of the third phase modulator is connected with the input end of the sixth single-mode fiber, and the output end of the sixth single-mode fiber is respectively connected with the input end of the demodulation module and the input end of the arithmetic unit;
the input end of the seventh single-mode fiber inputs another optical signal decomposed by the first beam splitter, the output end of the seventh single-mode fiber is connected with one input end of the fourth phase modulator, the other input end of the fourth phase modulator is connected with the output end of the fourth PRBS generator, the fourth PRBS generator generates a fourth driving signal to drive the fourth phase modulator to generate a random optical phase, the output end of the fourth phase modulator is connected with the input end of the eighth single-mode fiber, and the output end of the eighth single-mode fiber is connected with the input end of the demodulation module and the input end of the arithmetic unit respectively.
Preferably, the optical coupler further comprises a second beam splitter, a third beam splitter, a second optical coupler, a first photodetector and a second photodetector, the output end of the sixth single mode fiber is divided into two optical signals by the second beam splitter, the output end of the eighth single mode fiber is divided into two optical signals by the third beam splitter, one of the optical signals output by the second beam splitter and one of the optical signals output by the eighth single-mode fiber are input to the demodulation module through the second optical coupler, the input end of the first photodetector inputs another beam of optical signal decomposed by the second beam splitter, the output end of the first photoelectric detector is connected with the non-inverting input end of the arithmetic unit, the input end of the second photoelectric detector inputs another beam of optical signal decomposed by the third beam splitter, and the output end of the second photoelectric detector is connected with the inverting input end of the arithmetic unit.
Preferably, the first single-mode fiber, the third single-mode fiber, the fifth single-mode fiber and the seventh single-mode fiber are positive dispersion single-mode fibers, and the second single-mode fiber, the fourth single-mode fiber, the sixth single-mode fiber and the eighth single-mode fiber are reverse dispersion single-mode fibers.
Preferably, the optical fiber transmission device further comprises an optical amplifier, wherein the optical amplifier is arranged in the transmission path of the transmission optical fiber and is used for amplifying the optical signal in the transmission optical fiber.
A quadrature modulation secure optical communication method applied to the above-mentioned quadrature modulation secure optical communication apparatus, comprising the steps of:
the optical pulse generated by the pulse light source generator 101 is input to a QPSK modulator 201 to generate an orthogonal phase shift keying optical signal, the optical signal is input to a CSK modulator 301 to load intensity information, two outputs of the CSK modulator 301 are respectively connected to two input ends of a time domain phase coding module 4, then the signal encrypted by phase coding is coupled into a transmission optical fiber through a first optical coupler 501, the transmission optical fiber uses an optical amplifier 601 to amplify the attenuated optical signal, then the signal enters a time domain phase decoding module 8 through a first beam splitter 701 to remove a random optical phase, the output of the time domain phase decoding module 8 respectively passes through two beam splitters, one output of each beam splitter is used for demodulating a QPSK signal, and the other output of each beam splitter is detected by a balance detector and operated by an operator to obtain original intensity information.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
the invention utilizes the modulation module to simultaneously carry out phase and intensity modulation on the optical information, and compared with a single modulation dimension, the invention increases a modulation dimension and improves the transmission capability of the system. By applying the time domain phase coding module, spectrum phase coding is realized by applying different phase offsets to different spectrum components of the ultrashort light pulse, and the modulated signal is encrypted, so that the safety performance of the system and the information transmission rate capable of being carried are effectively improved.
Drawings
FIG. 1 is a schematic view of the apparatus of the present invention.
In the figure, 101 is a pulse light source generator, 201 is a QPSK modulator, 301 is a CSK modulator, 4 is a time-domain phase encoding module, 401 is a first single-mode fiber, 402 is a third single-mode fiber, 403 is a first phase modulator, 404 is a second phase modulator, 405 is a second single-mode fiber, 406 is a fourth single-mode fiber, 407 is a first PRBS generator, 408 is a second PRBS generator, 501 is a first optical coupler, 601 is an optical amplifier, 701 is a first beam splitter, 8 is a time-domain phase decoding module, 801 is a fifth single-mode fiber, 802 is a seventh single-mode fiber, 803 is a third phase modulator, 804 is a fourth phase modulator, 805 is a sixth single-mode fiber, 806 is an eighth single-mode fiber, 807 is a third PRBS generator, 808 is a fourth PRBS, 901 is a second beam splitter, 1101 is a third beam splitter, 1001 is a second optical coupler, 1201 is a QPSK demodulator, and 1301 is a first photodetector, 1401 is a second photodetector and 1501 is an operator.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent;
for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product;
it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
Example 1
The present embodiment provides an orthogonal modulation secure optical communication device, as shown in fig. 1, including a pulse light source generator 101, a signal modulation module, a time domain phase encoding module 4, a transmission fiber, a time domain phase decoding module 8, a demodulation module, and an operator 1501, where:
the output of pulse light source generator 101 with the input of signal modulation module is connected, signal modulation module is right the light signal that pulse light source generator 101 sent carries out phase place and intensity modulation simultaneously, the output of signal modulation module with time domain phase code module 4's input is connected, time domain phase code module 4 encodes the light signal after the modulation, time domain phase code module 4's output and transmission fiber's input are connected, transmission fiber's output with time domain phase decode module 8's input is connected, time domain phase decode module 8's output is connected with demodulation module's input and arithmetic unit 1501's input respectively, demodulation module's output demodulation signal, arithmetic unit 1501's output original signal intensity information.
The signal modulation module includes a QPSK modulator 201 and a CSK modulator 301, wherein an output end of the pulsed light source generator 101 is connected to an input end of the QPSK modulator 201, the QPSK modulator 201 performs QPSK modulation on an optical signal emitted by the pulsed light source generator 101, an output end of the QPSK modulator 201 is connected to an input end of the CSK modulator 301, the CSK modulator 301 performs CSK modulation on the QPSK-modulated optical signal, the CSK modulator 301 has two output ends, the time domain phase encoding module 4 has two input ends, and two output ends of the CSK modulator 301 are connected to two input ends of the time domain phase encoding module 4.
The demodulation module includes a QPSK demodulator 1201, wherein an output terminal of the time domain phase decoding module 8 is connected to an input terminal of the QPSK demodulator 1201, the QPSK demodulator 1201 performs QPSK demodulation on the optical signal, and an output terminal of the QPSK demodulator 1201 outputs the QPSK-demodulated optical signal.
The time domain phase encoding module 4 comprises a first single mode fiber 401, a second single mode fiber 405, a third single mode fiber 402, a fourth single mode fiber 406, a first phase modulator 403, a second phase modulator 404, a first PRBS generator 407 and a second PRBS generator 408, wherein:
an input end of the first single-mode fiber 401 is connected to an output end of the CSK modulator 301, an output end of the first single-mode fiber 401 is connected to an input end of the first phase modulator 403, another input end of the first phase modulator 403 is connected to an output end of the first PRBS generator 407, the first PRBS generator 407 generates a first driving signal to drive the first phase modulator 403 to generate a random optical phase, an output end of the first phase modulator 403 is connected to an input end of the second single-mode fiber 405, and an output end of the second single-mode fiber 405 is connected to the transmission fiber;
an input end of the third single-mode fiber 402 is connected to another output end of the CSK modulator 301, an output end of the third single-mode fiber 402 is connected to one input end of the second phase modulator 404, another input end of the second phase modulator 404 is connected to an output end of the second PRBS generator 408, the second PRBS generator 408 generates a second driving signal to drive the second phase modulator 404 to generate a random optical phase, an output end of the second phase modulator 404 is connected to an input end of the fourth single-mode fiber 406, and an output end of the fourth single-mode fiber 406 is connected to the transmission fiber.
The optical fiber transmission device further comprises a first optical coupler 501 and a first beam splitter 701, the output end of the second single-mode fiber 405 and the output end of the fourth single-mode fiber 406 are coupled and input to the transmission fiber through the first optical coupler 501, the time domain phase decoding module 8 has two input ends, the output end of the transmission fiber is decomposed into two beams of optical signals through the first beam splitter 701, and the two beams of optical signals are respectively input to the two input ends of the time domain phase decoding module 8.
The time domain phase decoding module 8 includes a fifth single mode fiber 801, a sixth single mode fiber 805, a seventh single mode fiber 802, an eighth single mode fiber 806, a third phase modulator 803, a fourth phase modulator 804, a third PRBS generator 807, and a fourth PRBS generator 808, wherein:
an input end of the fifth single-mode fiber 801 inputs a bundle of optical signals decomposed by the first beam splitter 701, an output end of the fifth single-mode fiber 801 is connected with one input end of the third phase modulator 803, another input end of the third phase modulator 803 is connected with an output end of the third PRBS generator 807, the third PRBS generator 807 generates a third driving signal to drive the third phase modulator 803 to generate a random optical phase, an output end of the third phase modulator 803 is connected with an input end of the sixth single-mode fiber 805, and output ends of the sixth single-mode fiber 805 are respectively connected with an input end of the demodulation module and an input end of the operator 1501;
the input end of the seventh single-mode fiber 802 inputs another optical signal decomposed by the first beam splitter 701, the output end of the seventh single-mode fiber 802 is connected to one input end of the fourth phase modulator 804, the other input end of the fourth phase modulator 804 is connected to the output end of the fourth PRBS generator 808, the fourth PRBS generator 808 generates a fourth driving signal to drive the fourth phase modulator 804 to generate a random optical phase, the output end of the fourth phase modulator 804 is connected to the input end of the eighth single-mode fiber 806, and the output end of the eighth single-mode fiber 806 is connected to the input end of the demodulation module and the input end of the operator 1501 respectively.
The optical fiber demodulation device further comprises a second beam splitter 901, a third beam splitter 1001, a second optical coupler 1101, a first photodetector 1301 and a second photodetector 1401, wherein the output end of the sixth single-mode fiber 805 is split into two optical signals by the second beam splitter 901, the output end of the eighth single-mode fiber 806 is split into two optical signals by the third beam splitter 1001, one optical signal output by the second beam splitter 901 and one optical signal output by the eighth single-mode fiber 806 are input to the demodulation module through the second optical coupler 1101, the input end of the first photodetector 1301 inputs the other optical signal split by the second beam splitter 901, the output end of the first photodetector 1301 is connected with the non-inverting input end of the arithmetic unit 1501, the input end of the second photodetector 1401 inputs the other optical signal split by the third beam splitter 1001, the output terminal of the second photodetector 1401 is connected to the inverting input terminal of the operator 1501.
The first single-mode fiber 401, the third single-mode fiber 402, the fifth single-mode fiber 801 and the seventh single-mode fiber 802 are positive dispersion single-mode fibers, the positive dispersion single-mode fibers are used for broadening pulses in a time domain, different spectral components of input pulses are expanded to different time positions within one bit duration, the second single-mode fiber 405, the fourth single-mode fiber 406, the sixth single-mode fiber 805 and the eighth single-mode fiber 806 are reverse dispersion single-mode fibers, and the reverse dispersion single-mode fibers perform time domain compression on the broadened pulses, so that the purpose of phase coding encryption is finally achieved.
The optical fiber transmission device further comprises an optical amplifier 601, wherein the optical amplifier 601 is arranged in the transmission path of the transmission fiber and is used for amplifying the optical signal in the transmission fiber.
Example 2
The present embodiment provides a quadrature modulation security optical communication method, which is applied to the quadrature modulation security optical communication apparatus described in embodiment 1, and includes the following steps:
the optical pulse generated by the pulse light source generator 101 is input to a QPSK modulator 201 to generate an orthogonal phase shift keying optical signal, the optical signal is input to a CSK modulator 301 to load intensity information, two outputs of the CSK modulator 301 are respectively connected to two input ends of a time domain phase coding module 4, then the signal encrypted by phase coding is coupled into a transmission optical fiber through a first optical coupler 501, the transmission optical fiber uses an optical amplifier 601 to amplify the attenuated optical signal, then the signal enters a time domain phase decoding module 8 through a first beam splitter 701 to remove a random optical phase, the output of the time domain phase decoding module 8 respectively passes through two beam splitters, one output of each beam splitter is used for demodulating a QPSK signal, and the other output of each beam splitter is detected by a balance detector and operated by an operator to obtain original intensity information.
The same or similar reference numerals correspond to the same or similar parts;
the terms describing positional relationships in the drawings are for illustrative purposes only and are not to be construed as limiting the patent;
it should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. The utility model provides an orthogonal modulation secret optical communication device which characterized in that, includes pulsed light source generator, signal modulation module, time domain phase code module, transmission fiber, time domain phase decoding module, demodulation module and arithmetic unit, wherein:
the output of pulse light source generator with the input of signal modulation module is connected, signal modulation module is right the light signal that pulse light source generator sent carries out phase place and intensity modulation simultaneously, the output of signal modulation module with the input of time domain phase coding module is connected, time domain phase coding module encodes the light signal after the modulation, time domain phase coding module's output and transmission fiber's input are connected, transmission fiber's output with the input of time domain phase decoding module is connected, time domain phase decoding module's output is connected with demodulation module's input and the input of arithmetic unit respectively, demodulation module's output demodulation signal, the output of arithmetic unit exports original signal intensity information.
2. The quadrature modulation privacy optical communication device of claim 1, wherein the signal modulation module comprises a QPSK modulator and a CSK modulator, wherein an output of the pulsed light source generator is connected to an input of the QPSK modulator, the QPSK modulator QPSK modulates the optical signal emitted by the pulsed light source generator, an output of the QPSK modulator is connected to an input of the CSK modulator, the CSK modulator CSK modulates the QPSK modulated optical signal, the CSK modulator has two outputs, the time domain phase coding module has two inputs, and two outputs of the CSK modulator are connected to two inputs of the time domain phase coding module.
3. The quadrature modulation privacy optical communication device of claim 2, wherein the demodulation module comprises a QPSK demodulator, wherein an output of the time domain phase decoding module is connected to an input of the QPSK demodulator, the QPSK demodulator QPSK demodulates the optical signal, and an output of the QPSK demodulator outputs the QPSK demodulated optical signal.
4. The quadrature modulated secure optical communication device of claim 1, wherein the time domain phase encoding module comprises a first single mode fiber, a second single mode fiber, a third single mode fiber, a fourth single mode fiber, a first phase modulator, a second phase modulator, a first PRBS generator, and a second PRBS generator, wherein:
an input end of the first single-mode fiber is connected with one output end of the CSK modulator, an output end of the first single-mode fiber is connected with one input end of the first phase modulator, another input end of the first phase modulator is connected with an output end of the first PRBS generator, the first PRBS generator generates a first driving signal to drive the first phase modulator to generate a random optical phase, an output end of the first phase modulator is connected with an input end of the second single-mode fiber, and an output end of the second single-mode fiber is connected with the transmission fiber;
the input end of the third single-mode fiber is connected with the other output end of the CSK modulator, the output end of the third single-mode fiber is connected with one input end of the second phase modulator, the other input end of the second phase modulator is connected with the output end of the second PRBS generator, the second PRBS generator generates a second driving signal to drive the second phase modulator to generate a random optical phase, the output end of the second phase modulator is connected with the input end of the fourth single-mode fiber, and the output end of the fourth single-mode fiber is connected with the transmission fiber.
5. The quadrature modulation privacy optical communication device of claim 4, further comprising a first optical coupler and a first beam splitter, wherein an output end of the second single-mode fiber and an output end of the fourth single-mode fiber are coupled and input to the transmission fiber through the first optical coupler, the time-domain phase decoding module has two input ends, and the output end of the transmission fiber is decomposed into two optical signals through the first beam splitter and respectively input to the two input ends of the time-domain phase decoding module.
6. The quadrature modulated secure optical communication device of claim 5, wherein the time domain phase decoding module comprises a fifth single mode fiber, a sixth single mode fiber, a seventh single mode fiber, an eighth single mode fiber, a third phase modulator, a fourth phase modulator, a third PRBS generator, and a fourth PRBS generator, wherein:
the input end of the fifth single-mode fiber inputs a bundle of optical signals decomposed by the first beam splitter, the output end of the fifth single-mode fiber is connected with one input end of the third phase modulator, the other input end of the third phase modulator is connected with the output end of the third PRBS generator, the third PRBS generator generates a third driving signal to drive the third phase modulator to generate a random optical phase, the output end of the third phase modulator is connected with the input end of the sixth single-mode fiber, and the output end of the sixth single-mode fiber is respectively connected with the input end of the demodulation module and the input end of the arithmetic unit;
the input end of the seventh single-mode fiber inputs another optical signal decomposed by the first beam splitter, the output end of the seventh single-mode fiber is connected with one input end of the fourth phase modulator, the other input end of the fourth phase modulator is connected with the output end of the fourth PRBS generator, the fourth PRBS generator generates a fourth driving signal to drive the fourth phase modulator to generate a random optical phase, the output end of the fourth phase modulator is connected with the input end of the eighth single-mode fiber, and the output end of the eighth single-mode fiber is connected with the input end of the demodulation module and the input end of the arithmetic unit respectively.
7. The quadrature modulation privacy optical communication device according to claim 6, further comprising a second beam splitter, a third beam splitter, a second optical coupler, a first photodetector and a second photodetector, wherein an output end of the sixth single mode fiber is split into two optical signals by the second beam splitter, an output end of the eighth single mode fiber is split into two optical signals by the third beam splitter, one optical signal output by the second beam splitter and one optical signal output by the eighth single mode fiber are input to the demodulation module by the second optical coupler, an input end of the first photodetector inputs the other optical signal split by the second beam splitter, an output end of the first photodetector is connected to an in-phase input end of the operator, and an input end of the second photodetector inputs the other optical signal split by the third beam splitter, and the output end of the second photoelectric detector is connected with the inverting input end of the arithmetic unit.
8. The quadrature modulation privacy optical communication device of claim 7, wherein the first, third, fifth and seventh single mode fibers are positive dispersion single mode fibers, and the second, fourth, sixth and eighth single mode fibers are reverse dispersion single mode fibers.
9. The quadrature modulated privacy optical communication device of claim 1, further comprising an optical amplifier disposed in the transmission path of the transmission fiber for amplifying the optical signal in the transmission fiber.
10. A quadrature modulation security optical communication method applied to the quadrature modulation security optical communication apparatus according to any one of claims 1 to 9, comprising the steps of:
the optical pulse generated by the pulse light source generator 101 is input to a QPSK modulator 201 to generate an orthogonal phase shift keying optical signal, the optical signal is input to a CSK modulator 301 to load intensity information, two outputs of the CSK modulator 301 are respectively connected to two input ends of a time domain phase coding module 4, then the signal encrypted by phase coding is coupled into a transmission optical fiber through a first optical coupler 501, the transmission optical fiber uses an optical amplifier 601 to amplify the attenuated optical signal, then the signal enters a time domain phase decoding module 8 through a first beam splitter 701 to remove a random optical phase, the output of the time domain phase decoding module 8 respectively passes through two beam splitters, one output of each beam splitter is used for demodulating a QPSK signal, and the other output of each beam splitter is detected by a balance detector and operated by an operator to obtain original intensity information.
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