CN107911171B - Transmitting end, receiving end, system and method based on coherent laser frequency hopping communication - Google Patents
Transmitting end, receiving end, system and method based on coherent laser frequency hopping communication Download PDFInfo
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- CN107911171B CN107911171B CN201711094947.3A CN201711094947A CN107911171B CN 107911171 B CN107911171 B CN 107911171B CN 201711094947 A CN201711094947 A CN 201711094947A CN 107911171 B CN107911171 B CN 107911171B
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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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- 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
- H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
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Abstract
The invention provides a transmitting end, a receiving end, a system and a method based on coherent laser frequency hopping communication, wherein at least two tunable lasers are arranged at the transmitting end and the receiving end and can work alternately, so that different wavelength information and keys can be obtained in each frequency hopping period, the data interception difficulty is greatly increased, and the communication safety is improved. In addition, the invention also encrypts and modulates the input signal of the current period according to the key and the wavelength information of the previous period, and a third party is difficult to acquire and distinguish the information of different periods, so that the modulation signal is difficult to demodulate and decrypt, and the safety of information transmission is ensured.
Description
Technical Field
The invention relates to the technical field of optical fiber communication, in particular to a transmitting end, a receiving end, a system and a method based on coherent laser frequency hopping communication.
Background
The optical fiber laser communication technology has become one of the most important components of the communication system in the modern society due to the advantages of high communication bandwidth, good stability, low cost and the like. According to statistics, the optical fiber communication network bears more than 90% of telecommunication services worldwide, and has irreplaceable important roles in national defense construction, economic development and people's life of various countries in the modern society. In the early development stage of the optical fiber communication technology, the optical fiber communication has better safety because the development of optoelectronic devices is immature. However, as optoelectronic devices and fiber optic eavesdropping techniques have grown mature, security of fiber optic communications, particularly undersea fiber optic cable communications, is facing significant challenges. The conventional optical fiber communication system transmits data continuously through a single channel, the transmission means is easy to eavesdrop, once the communication optical fiber is eavesdropped, all communication contents in a link are leaked, and great threat is brought to the safety of an optical fiber communication network.
Disclosure of Invention
Technical problem to be solved
The present invention is directed to a transmitting end, a receiving end, a system and a method based on coherent laser frequency hopping communication, so as to solve at least one of the above technical problems.
(II) technical scheme
In one aspect of the present invention, a transmitting end based on coherent laser frequency hopping communication is provided, including:
the transmitting signal processing module is used for receiving an input signal input from the outside in each frequency hopping period and generating a key of the current frequency hopping period and wavelength information of the current frequency hopping period; encrypting the input signal according to a secret key of an Nth period before the current frequency hopping period to determine encrypted information, wherein N is a positive integer; and
and the electro-optical modulation module comprises at least two tunable lasers for generating laser, and is used for loading the encrypted information on the laser output by the idle tunable laser and determining and outputting a modulation signal, wherein the idle tunable laser refers to the tunable laser which is adjusted according to the wavelength information of the Nth period before the current frequency hopping period.
In some embodiments of the invention, the electro-optic modulation module further comprises:
the first optical switch is connected with the tunable laser and used for selectively outputting the laser of the idle tunable laser; and a coherent modulator, connected to the first optical switch, for loading the encrypted information onto the laser of the idle tunable laser; or
At least two coherent modulators, connected to the tunable laser one by one, for loading the encrypted information on the laser; and the first optical switch is connected with the coherent modulator and used for selectively outputting the modulation signal of the idle tunable laser.
In some embodiments of the present invention, the transmission signal processing module is further configured to divide the input signal into a plurality of segment signals, and the segment signals are processed in each frequency hopping period to obtain a modulated signal.
In some embodiments of the invention, the transmit signal processing module is a field programmable gate array chip.
In another aspect of the present invention, a receiving end based on coherent laser frequency hopping communication is further provided, which includes a coherent demodulator, a local oscillator light source module, and a received signal processing module, wherein,
the coherent demodulator is used for converting external modulation signals input from the outside in each frequency hopping period into electric signals; demodulating the electric signal according to local oscillator laser generated by an idle local oscillator laser to determine a demodulated signal;
a received signal processing module, configured to receive the electrical signal, generate a key of a current frequency hopping period and wavelength information of the current frequency hopping period, and perform decryption processing on the demodulated signal according to a key of an nth period before the current frequency hopping period, to determine decrypted information, where N is a positive integer;
the local oscillator light source module comprises at least two local oscillator lasers for generating local oscillator lasers, and is used for selecting an idle local oscillator laser, wherein the idle local oscillator laser refers to the local oscillator laser which is adjusted according to the wavelength information of the Nth period before the current frequency hopping period;
in some embodiments of the present invention, the local oscillator light source module further includes:
and the second optical switch is used for selecting an idle local oscillator laser.
In some embodiments of the invention, the coherent demodulator comprises a coupler, a balanced detector, a low pass filter and an analog to digital converter.
In another aspect of the present invention, a system based on coherent laser frequency hopping communication is further provided, including:
a transmitting end comprising:
the transmitting signal processing module is used for receiving an input signal input from the outside in each frequency hopping period and generating a key of the current frequency hopping period and wavelength information of the current frequency hopping period; encrypting the input signal according to a secret key of an Nth period before the current frequency hopping period to determine encrypted information, wherein N is a positive integer;
the electro-optical modulation module comprises at least two tunable lasers for generating laser, and the electro-optical modulation module is used for loading the encrypted information on the laser output by an idle tunable laser and determining and outputting a modulation signal, wherein the idle tunable laser refers to the tunable laser which is adjusted according to the wavelength information of the Nth period before the current frequency hopping period;
the receiving end comprises a coherent demodulator, a local oscillation light source module and a received signal processing module, wherein,
the coherent demodulator is used for converting external modulation signals input from the outside in each frequency hopping period into electric signals; demodulating the electric signal according to local oscillator laser generated by an idle local oscillator laser to determine a demodulated signal;
a received signal processing module, configured to decrypt the demodulated signal according to a secret key of an nth cycle before a current frequency hopping cycle, determine decrypted information, and generate a secret key of the current frequency hopping cycle and wavelength information of the current frequency hopping cycle;
the local oscillator light source module comprises at least two local oscillator lasers used for generating local oscillator lasers, and is used for selecting an idle local oscillator laser, wherein the idle local oscillator laser refers to the local oscillator laser which is adjusted according to the wavelength information of the Nth period before the current frequency hopping period.
In another aspect of the present invention, a method for coherent laser frequency hopping based communication is further provided, where the system includes:
receiving an input signal input from the outside in each frequency hopping period, and generating a key of the current frequency hopping period and wavelength information of the current frequency hopping period; encrypting the input signal according to a secret key of an Nth period before the current frequency hopping period to determine encrypted information, wherein N is a positive integer;
loading the encrypted information on laser output by an idle tunable laser, and determining and outputting a modulation signal, wherein the idle tunable laser refers to a tunable laser which is adjusted according to the wavelength information of the Nth period before the current frequency hopping period;
converting an external modulation signal input from the outside in each frequency hopping period into an electric signal; demodulating the electrical signal according to local oscillator laser generated by an idle local oscillator laser to determine demodulated information, wherein the idle local oscillator laser refers to the local oscillator laser which is adjusted according to the wavelength information of the Nth period before the current frequency hopping period; and
and receiving the electric signal, decrypting the demodulated signal according to the secret key of the Nth period before the current frequency hopping period, determining decrypted information, and generating the secret key of the current frequency hopping period and the wavelength information of the current frequency hopping period.
(III) advantageous effects
Compared with the prior art, the transmitting end, the receiving end, the system and the method based on coherent laser frequency hopping communication at least have the following advantages:
1. the transmitting end and the receiving end are provided with at least two tunable lasers which can work alternately, so that different wavelength information and keys can be obtained in each frequency hopping period, the data interception difficulty is greatly increased, and the communication safety is improved.
2. According to the key and the wavelength information of the previous period, the input signal of the current period is encrypted and modulated, and a third party is difficult to acquire and distinguish information of different periods, so that the modulated signal is difficult to demodulate and decrypt, and the safety of information transmission is ensured.
3. The input information is segmented, and the segment signals can be transmitted in a segmented manner, so that a third party can be prevented from easily acquiring the complete content of the input information at one time.
4. The coherent demodulator and the local oscillator laser are independently arranged, the local oscillator laser built in the conventional coherent demodulator is independent, and the condition that the tuning rate of the local oscillator laser built in the conventional coherent demodulator is too low is prevented.
Drawings
Fig. 1 is a schematic structural diagram of a transmitting end based on coherent laser frequency hopping communication according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a receiving end based on coherent laser frequency hopping communication according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a system based on coherent laser frequency hopping communication according to an embodiment of the present invention.
Fig. 4 is a schematic step diagram of a coherent laser frequency hopping communication method according to an embodiment of the present invention.
Detailed Description
Based on the poor confidentiality of the optical fiber communication network in the prior art, the invention provides a transmitting end, a receiving end, a system and a method based on coherent laser frequency hopping communication. In addition, the invention also encrypts and modulates the input signal of the current period according to the key and the wavelength information of the previous period, and a third party is difficult to acquire and distinguish the information of different periods, so that the modulation signal is difficult to demodulate and decrypt, and the safety of information transmission is ensured.
For the purpose of promoting a better understanding of the objects, aspects and advantages of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
Fig. 1 is a schematic structural diagram of a transmitting end based on coherent laser frequency hopping communication according to an embodiment of the present invention, and as shown in fig. 1, the transmitting end 1 includes: a transmitting signal processing module 11 and an electro-optical modulation module 12.
The transmission signal processing module 11 is configured to receive an input signal input from the outside in each frequency hopping period, and generate a key of a current frequency hopping period and wavelength information of the current frequency hopping period; and encrypting the input signal according to a secret key of an Nth period before the current frequency hopping period to determine encrypted information, wherein N is a positive integer.
Since a field programmable gate array chip (FPGA) has an advantage of being programmable, the transmission information processing module may be an FPGA. Thus, the input signal and the modulated signal are both digital signals and the encryption algorithm may be the AES (advanced encryption standard) algorithm or any other digital encryption algorithm. The input signal may be a data signal transmitted by an optical fiber, and a digital microwave signal is obtained by SFP (small-form-factor pluggable) module conversion; can be an analog microwave signal, and is converted into a digital microwave signal through an analog-to-digital converter; or may be a direct digital microwave signal.
It can be understood that the key and the channel wavelength in different frequency hopping periods are different, and the frequency hopping period can reach 100us at least, so that the third party is difficult to intercept the information in the frequency hopping period, and the communication security and safety of the transmitting terminal 1 are improved.
The electro-optical modulation module 12 includes at least two tunable lasers for generating laser light, where the tunable lasers may be Distributed Bragg Reflector (DBR) lasers or Distributed Feedback (DFB) lasers, and the electro-optical modulation module 12 is configured to load the encrypted information on laser light output by an idle tunable laser, and determine and output a modulation signal, where the idle tunable laser refers to a tunable laser that is adjusted according to wavelength information of an nth period before a current frequency hopping period. Meanwhile, in the subsequent demodulation process of the modulation signal, local oscillator laser with the same frequency (homodyne detection) or similar frequency (heterodyne detection) participates, and an eavesdropper cannot quickly obtain frequency information in a frequency hopping period, so that data cannot be demodulated, and the communication safety is improved.
At least two tunable lasers are adopted, because the tuning rate of the tunable lasers is low, when the output of the lasers is adjusted to a new wavelength, 60-100us of time is usually needed to enable the output wavelength to be stable, so that the at least two tunable lasers can be adopted to realize the alternate working of the lasers and eliminate the influence of the wavelength stabilizing time on a link. For the same reason, the local oscillator light source module 23 at the receiving end also employs at least two local oscillator lasers.
In addition, the electro-optical modulation module 12 further includes: a coherent modulator and a first optical switch. The number of the first optical switches is one, and the number of the coherent modulators can be one or the same as the number of the tunable lasers, and can be selected according to the actual needs of users. And when the number of the coherent modulators is one, the first optical switch is connected with at least two tunable lasers and used for selectively outputting the laser light of the idle tunable laser, and the coherent modulator is connected with the first optical switch and used for loading the encrypted information on the laser light of the idle tunable laser. When the number of the coherent modulators is the same as that of the tunable lasers, the coherent modulators are connected with the tunable lasers one by one and used for loading the encrypted information on the lasers, and the first optical switch is used for selectively outputting modulation signals of the idle tunable lasers.
The coherent modulator may be an in-phase quadrature modulator (IQ) and the format of the coherent modulation may be phase shift keying modulation (PSK) or Quadrature Amplitude Modulation (QAM), which may enhance privacy.
If the coherent modulator is an in-phase quadrature modulator (IQ), when the output wavelength of the tunable laser is adjusted, the bias voltage of the IQ modulator needs to be adjusted to reach a half-wave voltage corresponding to the output wavelength of the laser, and the emission control module also needs to control the first optical switch to select an output channel of the modulator. When the wavelength hopping range is below 10nm, the variation amplitude of the half-wave voltage of the electro-optic crystal of the IQ modulator is small, and the bias voltage of the IQ modulator can be adjusted without; when the wavelength hopping range is above 50nm, the half-wave voltage variation caused by the wavelength variation is not negligible, and the IQ modulator bias voltage must follow the wavelength variation.
The first optical switch, which may be a 1 × 2 optical switch, is of a type including, but not limited to, an electro-optic crystal optical switch and a directional coupling type optical switch, for selectively outputting the modulation signal of the idle tunable laser.
In some embodiments of the present invention, the transmission signal processing module 11 may be further configured to divide the input signal into a plurality of segment signals, the segment signals are processed in each frequency hopping period to obtain a modulation signal, so as to divide the input signal into a plurality of segment signals (fragment signals), and the segment signals are encrypted and modulated in each frequency hopping period to obtain a modulation signal.
In another aspect of the present invention, a receiving end based on coherent laser frequency hopping communication is further provided, and fig. 2 is a receiving end based on coherent laser frequency hopping communication according to an embodiment of the present invention, as shown in fig. 2, the receiving end 2 includes a coherent demodulator 21, a local oscillator light source module 23, and a received signal processing module 22.
The coherent demodulator 21 is configured to convert an external modulation signal input from the outside in each frequency hopping period into an electrical signal; and demodulating the electric signal according to local oscillator laser generated by an idle local oscillator laser to determine demodulated information. And the coherent demodulator 21 comprises a coupler, a balanced detector, a low-pass filter and an analog-to-digital converter, wherein the detector functions to convert the external modulation signal transmitted from the optical fiber in each frequency hopping period into an electrical signal for subsequent processing.
A received signal processing module 22, configured to receive the electrical signal, generate a key of a current frequency hopping period and wavelength information of the current frequency hopping period, and perform decryption processing on the demodulated signal according to a key of an nth period before the current frequency hopping period, where N is a positive integer, and determine decrypted information;
the local oscillator light source module 23 includes at least two local oscillator lasers (also tunable lasers) for generating local oscillator lasers, and the local oscillator light source module 23 is configured to select an idle local oscillator laser, where the idle local oscillator laser refers to a local oscillator laser that is adjusted according to wavelength information of an nth period before a current frequency hopping period. The invention separates the local oscillator laser built in the conventional coherent demodulator, and prevents the tuning rate of the local oscillator laser built in the conventional coherent demodulator from being too low to meet the requirement of the invention.
It is understood that the local oscillator light source module 23 may further include a second optical switch for selectively outputting the demodulated signal of the idle local oscillator laser, which may be a micro-electromechanical system (MEMS) optical switch, an electro-optical crystal optical switch, or a directional coupling type optical switch.
In another aspect of the embodiment of the present invention, a system based on coherent laser frequency hopping communication is further provided, and fig. 3 is a schematic structural diagram of the system based on coherent laser frequency hopping communication according to the embodiment of the present invention, as shown in fig. 3, the system 3 includes the foregoing transmitting end 1 and receiving end 2.
Wherein, transmitting terminal 1 includes: a transmitting signal processing module 11 and an electro-optical modulation module 12.
The transmission signal processing module 11 is configured to receive an input signal input from the outside in each frequency hopping period, and generate a key of a current frequency hopping period and wavelength information of the current frequency hopping period; and encrypting the input signal according to a secret key of an Nth period before the current frequency hopping period to determine encrypted information, wherein N is a positive integer, and is preferably 1-10.
And the electro-optical modulation module 12 includes at least two tunable lasers for generating laser light, and is configured to load the encrypted information on the laser light output by an idle tunable laser, and determine and output a modulation signal, where the idle tunable laser refers to a tunable laser that is adjusted according to the wavelength information of an nth period before a current frequency hopping period.
The receiving end 2 includes: coherent demodulator 21, received signal processing module 22 and local oscillator light source module 23.
A coherent demodulator 21, configured to convert an external modulation signal input from the outside in each frequency hopping period into an electrical signal, a secret key, and wavelength information; demodulating the electric signal according to local oscillator laser generated by an idle local oscillator laser to determine demodulated information;
a received signal processing module 22, configured to receive the electrical signal, generate a key of a current frequency hopping period and wavelength information of the current frequency hopping period, and perform decryption processing on the demodulated signal according to a key of an nth period before the current frequency hopping period to determine decrypted information;
the local oscillator light source module 23 includes at least two local oscillator lasers for generating local oscillator laser, and the local oscillator light source module 23 is configured to select an idle local oscillator laser, where the idle local oscillator laser refers to a local oscillator laser that has been adjusted according to wavelength information of an nth period before a current frequency hopping period.
The frequency hopping frequency range of the system does not exceed 10000Hz and is determined by two optical switch rates and two tunable laser tuning rates, the output wavelength of the optical switch is stabilized within 50-100us, and the frequency hopping range can be properly improved by adopting 2 or more tunable lasers at the transmitting end and the receiving end, but the complexity of the system can be increased. Meanwhile, the communication rate is rapidly reduced due to the increase of the frequency hopping frequency, and the communication rate can be ensured while the frequency hopping frequency is increased only by adopting the optical switch with higher rate.
The electro-optical modulation module and the received signal processing module of the two systems which are communicated with each other can adopt communication optical fibers as communication media, so that the system is simple and convenient.
In another aspect of the present invention, a method for coherent laser frequency hopping based communication is further provided, where the system for coherent laser frequency hopping based communication is adopted, and fig. 4 is a schematic diagram of steps of the method for coherent laser frequency hopping based communication according to the embodiment of the present invention, as shown in fig. 4, the method includes the following steps:
s1, receiving an input signal input from the outside in each frequency hopping period, and generating a key of the current frequency hopping period and wavelength information of the current frequency hopping period; encrypting the input signal according to a secret key of an Nth period before the current frequency hopping period to determine encrypted information, wherein N is a positive integer;
s2, loading the encrypted information on laser output by an idle tunable laser, and determining and outputting a modulation signal, wherein the idle tunable laser refers to a tunable laser which is adjusted according to the wavelength information of the Nth period before the current frequency hopping period;
s3, converting the external modulation signal input from the outside in each frequency hopping period into an electric signal, a key and wavelength information; demodulating the electrical signal according to local oscillator laser generated by an idle local oscillator laser to determine demodulated information, wherein the idle local oscillator laser refers to the local oscillator laser which is adjusted according to the wavelength information of the Nth period before the current frequency hopping period; and
s4, receiving the electric signal, generating the key of the current frequency hopping period and the wavelength information of the current frequency hopping period, and decrypting the demodulated signal according to the key of the Nth period before the current frequency hopping period to determine the decrypted information.
In the following, taking N as 1 as an example, that is, at the beginning of each hop period, the transmission information processing module randomly generates the key and the wavelength information in the last 1 hop period within a predetermined range, and outputs the key and the wavelength information to the receiving end. The wavelength information and encryption method used for encryption and modulation in the current period are generated from the previous period of the hopping period. At the receiving end, the received information processing module decrypts and demodulates the encrypted information received in the current period according to the key and the wavelength information generated in the previous period.
The system adopts a full-duplex working mode, the transmitted data is stored in a buffer area, and the data is deleted after the receiving end of the other side confirms to receive the data. If the error code occurs due to accidental factors during the communication process, when the demodulation error occurs at the receiving end in a certain frequency hopping period, the key and wavelength information contained in the period cannot be acquired, the next period and all the following periods cannot receive and demodulate signals, and the previous communication can be continued only by establishing a new link according to the wavelength and password information of the key bank again. At this moment, the receiving end of the opposite party transmits the electric signal obtained by the coherent demodulator to the transmitting end of the opposite party, and the transmitting end of the opposite party resets a transmitting channel and a secret key according to secret key library information agreed by the two parties and recovers communication, wherein the secret key libraries have various secret key information with different priorities, and the secret key libraries of the two parties are automatically updated when the channel is idle, so that the randomness of the secret key libraries is ensured.
When the tunable laser is a DBR laser, the transmitting information processing module randomly generates wavelength information and a key of the next frequency hopping period, and the transmitting information processing module adjusts the DBR laser raster voltage (and thus the wavelength of the laser) in the electric light modulation module and the half-wave voltage of the modulator corresponding to the wavelength. After the voltage changes, the DBR laser needs 60-100us of time to reach stable output, which can be reached before the next frequency hopping period starts. At the beginning of the next cycle, the input signal is shifted to the laser wavelength of the tunable laser (idle tunable laser) that has been adjusted according to the wavelength information of the previous frequency hopping cycle, the input signal is encrypted, modulated and output, and the other tunable laser performs wavelength adjustment (non-idle tunable laser). To increase the system frequency hopping frequency, more tunable lasers may be employed.
Similarly, the receiving end local oscillation light source module works in a similar principle, after a certain frequency hopping period starts, the information processing module generates the transmission wavelength of the next frequency hopping period, and the receiving control module immediately adjusts the grating voltage of a local oscillation laser in the local oscillation light source module, so that the output wavelength of the local oscillation laser reaches a stable value before the next period starts, and the local oscillation laser can be used as an idle local oscillation laser for demodulation.
Because the communication system adopts a coherent communication technology, coherent demodulation must be adopted in the demodulation process, and local oscillator laser with corresponding communication wavelength is required to participate in demodulation. Since the wavelength information and the key are randomly generated, even if both communication parties cannot know in advance, the third party cannot steal the wavelength information and the key in advance at all, and the encrypted information cannot be decrypted and demodulated. In the communication process, a third party can demodulate the encrypted information in a certain frequency hopping period by using a fixed local oscillator light source, but the encrypted information cannot be decrypted by obtaining a random key, and before the next frequency hopping period comes, the decryption can be performed only within hundreds of microseconds, which cannot be realized at all in terms of the performance of the existing computer, once the time limit is exceeded, the third party cannot keep up with the frequency hopping frequency of the frequency hopping system, and the communication safety can be ensured. In a certain frequency hopping period, only a few fragment signals exist, and a third party can not obtain all input information even if the fragment signals take days to decipher.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A transmitting end based on coherent laser frequency hopping communication, comprising:
the transmitting signal processing module is used for receiving an input signal input from the outside in each frequency hopping period and generating a key of the current frequency hopping period and wavelength information of the current frequency hopping period; encrypting the input signal according to a secret key of an Nth period before the current frequency hopping period to determine encrypted information, wherein N is a positive integer; and
and the electro-optical modulation module comprises at least two tunable lasers for generating laser, and is used for loading the encrypted information on the laser output by the idle tunable laser and determining and outputting a modulation signal, wherein the idle tunable laser refers to the tunable laser which is adjusted according to the wavelength information of the Nth period before the current frequency hopping period.
2. The transmitting end of claim 1, wherein the electro-optic modulation module further comprises:
the first optical switch is connected with the tunable laser and used for selectively outputting the laser of the idle tunable laser; and a coherent modulator, connected to the first optical switch, for loading the encrypted information onto the laser of the idle tunable laser; or
At least two coherent modulators, connected to the tunable laser one by one, for loading the encrypted information on the laser; and the first optical switch is connected with the coherent modulator and used for selectively outputting the modulation signal of the idle tunable laser.
3. The transmitting terminal of claim 1, wherein the transmit signal processing module is further configured to divide the input signal into a plurality of segment signals, and the segment signals are processed in each hop period to obtain a modulated signal.
4. The transmitting terminal of claim 1, wherein the transmission signal processing module is a field programmable gate array chip.
5. A receiving end based on coherent laser frequency hopping communication comprises a coherent demodulator, a local oscillator light source module and a received signal processing module, wherein,
the coherent demodulator is used for converting external modulation signals input from the outside in each frequency hopping period into electric signals; demodulating the electric signal according to local oscillator laser generated by an idle local oscillator laser to determine a demodulated signal;
a received signal processing module, configured to receive the electrical signal, generate a key of a current frequency hopping period and wavelength information of the current frequency hopping period, and perform decryption processing on the demodulated signal according to a key of an nth period before the current frequency hopping period, to determine decrypted information, where N is a positive integer;
the local oscillator light source module comprises at least two local oscillator lasers used for generating local oscillator lasers, and is used for selecting an idle local oscillator laser, wherein the idle local oscillator laser refers to the local oscillator laser which is adjusted according to the wavelength information of the Nth period before the current frequency hopping period.
6. The receiving end according to claim 5, wherein the local oscillator light source module further comprises:
and the second optical switch is used for selecting an idle local oscillator laser.
7. The receiving end of claim 5, wherein the coherent demodulator comprises a coupler, a balanced detector, a low pass filter, and an analog-to-digital converter.
8. A system based on coherent laser frequency hopping communication, comprising:
a transmitting end comprising:
the transmitting signal processing module is used for receiving an input signal input from the outside in each frequency hopping period and generating a key of the current frequency hopping period and wavelength information of the current frequency hopping period; encrypting the input signal according to a secret key of an Nth period before the current frequency hopping period to determine encrypted information, wherein N is a positive integer;
the electro-optical modulation module comprises at least two tunable lasers for generating laser, and the electro-optical modulation module is used for loading the encrypted information on the laser output by an idle tunable laser and determining and outputting a modulation signal, wherein the idle tunable laser refers to the tunable laser which is adjusted according to the wavelength information of the Nth period before the current frequency hopping period;
the receiving end comprises a coherent demodulator, a local oscillation light source module and a received signal processing module, wherein,
the coherent demodulator is used for converting external modulation signals input from the outside in each frequency hopping period into electric signals; demodulating the electric signal according to local oscillator laser generated by an idle local oscillator laser to determine a demodulated signal;
a received signal processing module, configured to receive the electrical signal, decrypt the demodulated signal according to a secret key of an nth cycle before a current frequency hopping cycle, determine decrypted information, and generate a secret key of the current frequency hopping cycle and wavelength information of the current frequency hopping cycle;
the local oscillator light source module comprises at least two local oscillator lasers used for generating local oscillator lasers, and is used for selecting an idle local oscillator laser, wherein the idle local oscillator laser refers to the local oscillator laser which is adjusted according to the wavelength information of the Nth period before the current frequency hopping period.
9. A method based on coherent laser frequency hopping communications, employing the system of claim 8, comprising:
receiving an input signal input from the outside in each frequency hopping period, and generating a key of the current frequency hopping period and wavelength information of the current frequency hopping period; encrypting the input signal according to a secret key of an Nth period before the current frequency hopping period to determine encrypted information, wherein N is a positive integer;
loading the encrypted information on laser output by an idle tunable laser, and determining and outputting a modulation signal, wherein the idle tunable laser refers to a tunable laser which is adjusted according to the wavelength information of the Nth period before the current frequency hopping period;
converting an external modulation signal input from the outside in each frequency hopping period into an electric signal; demodulating the electrical signal according to local oscillator laser generated by an idle local oscillator laser to determine a demodulated signal, wherein the idle local oscillator laser refers to the local oscillator laser which is adjusted according to the wavelength information of the Nth period before the current frequency hopping period; and
and receiving the electric signal, decrypting the demodulated signal according to the secret key of the Nth period before the current frequency hopping period, determining decrypted information, and generating the secret key of the current frequency hopping period and the wavelength information of the current frequency hopping period.
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| CN201711094947.3A CN107911171B (en) | 2017-11-08 | 2017-11-08 | Transmitting end, receiving end, system and method based on coherent laser frequency hopping communication |
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