CN114337731B - Optical frequency hopping communication system and method - Google Patents
Optical frequency hopping communication system and method Download PDFInfo
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- CN114337731B CN114337731B CN202111445449.5A CN202111445449A CN114337731B CN 114337731 B CN114337731 B CN 114337731B CN 202111445449 A CN202111445449 A CN 202111445449A CN 114337731 B CN114337731 B CN 114337731B
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Abstract
The present disclosure provides an optical frequency hopping communication system, including: a transmitter (100) configured to modulate two paths of user data on a first carrier signal and a second carrier signal, respectively, to generate a first data signal and a second data signal, and couple the first data signal and the second data signal to transmit a transmission signal, where frequencies of the first carrier signal and the second carrier signal hop on two frequencies based on opposite hopping sequences, respectively, and wavelengths of the first carrier signal and the second carrier signal at the same time are complementary to each other; a receiver (200) for receiving the transmission signal, separating into a first frequency signal and a second frequency signal based on frequency, recovering the first data signal and the second data signal based on the same frequency hopping sequence as the transmitter (100), and demodulating to obtain two paths of user data. According to the method and the device, the user data are loaded on the carrier signals with randomly hopping frequencies, so that the data are effectively hidden, and illegal third party eavesdropping is prevented.
Description
Technical Field
The present disclosure relates to the field of optical communications, and in particular, to an optical frequency hopping communication system and method.
Background
The development of optical fiber communication technology has been rapid in recent years, and the social progress and economic development are greatly promoted. However, with the frequent occurrence of user information leakage events around the world in recent years, the risk that user data is stolen by an illegal third party in transmission is increasing, and the optical communication security technology is receiving increasing attention.
Among existing secure communication mechanisms, encryption of user data using an algorithm at a software layer is the most common method. However, with the tremendous increase in computing power, the security of this approach is beginning to be compromised. Therefore, more and more researchers are focusing on physical layer security technologies. The physical layer security technology is to enhance the security of communication by appropriately encoding and processing signals by using the physical characteristics of a communication channel. Optical frequency hopping is one of physical layer security technologies, and data hiding is mainly realized by hopping digital signals among different channels. User data is first divided into segments in the time domain, and then the segments are transmitted over different physical channels. By the scheme, the random hopping of the user data among channels corresponding to different wavelengths can be realized, and information leakage and illegal eavesdropping are effectively prevented.
Disclosure of Invention
In view of the above, the present disclosure provides an optical frequency hopping communication system, including: the transmitter is used for modulating two paths of user data on a first carrier signal and a second carrier signal respectively to generate a first data signal and a second data signal, and coupling the first data signal and the second data signal into a transmitting signal for transmission, wherein the frequencies of the first carrier signal and the second carrier signal are hopped on two frequencies based on opposite hopping sequences respectively, and the wavelengths of the first carrier signal and the second carrier signal at the same moment are complementary; and the receiver is used for receiving the transmitting signal, separating the transmitting signal into a first frequency signal and a second frequency signal based on frequency, recovering the first data signal and the second data signal based on the same frequency hopping sequence as the transmitter, and demodulating to obtain two paths of user data.
Optionally, the transmitter comprises: the phase modulation module is used for generating a waveform signal, a first radio frequency signal and a second radio frequency signal, wherein the phase difference between the waveform signal and the first radio frequency signal jumps along with a frequency hopping sequence, and the phase difference between the waveform signal and the second radio frequency signal jumps along with an opposite frequency hopping sequence; the frequency modulation module is used for generating a laser signal, modulating the laser signal based on the waveform signal and the first radio frequency signal to generate a first carrier signal, and modulating the laser signal based on the waveform signal and the second radio frequency signal to generate a second carrier signal; the data modulation module is used for modulating the two paths of user data on a first carrier signal and a second carrier signal respectively to generate a first data signal and a second data signal; and the transmitting signal forming module is used for coupling the first data signal and the second data signal into a transmitting signal.
Optionally, the receiver comprises: the second filtering module is used for separating the transmitting signals and generating a first frequency signal and a second frequency signal which have different frequencies; a modulated carrier recovery module for alternately outputting segments of the first frequency signal and the second frequency signal based on the same frequency hopping sequence as the transmitter to recover the first data signal and the second data signal; and the signal demodulation module is used for demodulating the first data signal and the second data signal to obtain each path of user data.
Optionally, the phase modulation module comprises: a first hopping sequence generator for generating a hopping sequence; and the phase modulation unit comprises a first phase-adjustable instrument and a second phase-adjustable instrument, the first phase-adjustable instrument generates a first radio-frequency signal based on the phase of the frequency hopping sequence modulation waveform signal, and the second phase-adjustable instrument generates a second radio-frequency signal based on the phase of the opposite frequency hopping sequence modulation waveform signal.
Optionally, the frequency modulation module comprises: the continuous wave laser is connected with the frequency hopping modulation unit and used for generating laser signals; the frequency hopping modulation unit comprises a first dual-drive Mach-Zehnder modulator and a second dual-drive Mach-Zehnder modulator, wherein the first dual-drive Mach-Zehnder modulator is used for modulating a waveform signal and a first radio-frequency signal on a laser signal to generate a first carrier signal, and the second dual-drive Mach-Zehnder modulator is used for modulating the waveform signal and a second radio-frequency signal on the laser signal to generate a second carrier signal; a first filtering unit comprising a first optical notch filter and a second optical notch filter for filtering the center frequencies of the first carrier signal and the second carrier signal, respectively.
Optionally, the transmitter further comprises: and the preprocessing encryption module is connected with the signal modulation module and is used for encrypting each path of user data.
Optionally, the modulated carrier recovery module further includes: a second hopping sequence generator for generating a hopping sequence identical to the transmitter; and the voltage control end of the 2 multiplied by 2 optical switch is connected with the second frequency hopping sequence generator and is used for controlling the communication state between the input end and the output end of the optical switch based on the frequency hopping sequence so as to realize that the segments of the first frequency signal and the second frequency signal are alternately output based on the frequency hopping sequence to form a first data signal and a second data signal.
Optionally, the receiver further comprises: and the decryption module is used for decrypting each path of user data based on the encryption mode of the preprocessing module.
Optionally, the frequency hopping sequence is one of an M-sequence, a Gold sequence, and an RS sequence.
The present disclosure also provides an optical frequency hopping communication method, including: modulating two paths of user data on a first carrier signal and a second carrier signal respectively to generate a first data signal and a second data signal, and coupling the first data signal and the second data signal into a transmitting signal for transmitting, wherein the frequencies of the first carrier signal and the second carrier signal hop on two frequencies based on opposite frequency hopping sequences respectively, and the wavelengths of the first carrier signal and the second carrier signal at the same moment are complementary; and receiving a transmitting signal, separating the transmitting signal into a first frequency signal and a second frequency signal based on frequency, recovering the first data signal and the second data signal based on a frequency hopping sequence which is the same as that of the transmitter, and demodulating to obtain two paths of user data.
The transmitter of the optical frequency hopping communication system realizes the frequency hopping of carrier signals under the control of a frequency hopping sequence, and realizes the division of user data into segments by loading the user data on the carrier signals with randomly hopped frequencies, and then transmits the user data by different physical channels, so that the data can be effectively hidden, the interception by an illegal third party is prevented, and the safety of data transmission is further improved.
Drawings
The foregoing and other objects, features and advantages of the disclosure will be apparent from the following description of embodiments of the disclosure, taken in conjunction with the accompanying drawings of which:
fig. 1 schematically illustrates a block diagram of an optical frequency hopping communication system according to an embodiment of the present disclosure;
FIG. 2 schematically illustrates a device diagram of an optical frequency hopping communication system, in accordance with an embodiment of the present disclosure;
fig. 3 schematically illustrates a schematic diagram of the operation of a phase modulation module 110 according to an embodiment of the disclosure;
FIG. 4 schematically illustrates a schematic diagram of the operating principle of a dual drive Mach-Zehnder modulator according to an embodiment of the present disclosure;
FIG. 5 schematically illustrates a schematic diagram of a user data encryption principle according to an embodiment of the disclosure;
FIG. 6 is a schematic diagram illustrating an optical frequency hopping communication method according to an embodiment of the present disclosure;
fig. 7 schematically illustrates a two-way carrier signal based on a frequency modulation sequence according to an embodiment of the present disclosure;
FIG. 8 schematically illustrates two frequency signal diagrams after frequency separation of a transmit signal, in accordance with an embodiment of the disclosure; and
fig. 9 schematically illustrates a distribution of user data on a frequency signal, in accordance with an embodiment of the disclosure.
Detailed Description
Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. It should be understood that these descriptions are illustrative only and are not intended to limit the scope of the present disclosure. In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the disclosure. It may be evident, however, that one or more embodiments may be practiced without these specific details. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The terms "comprises," "comprising," and the like, as used herein, specify the presence of stated features, steps, operations, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, or components.
All terms, including technical and scientific terms, used herein have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. It is noted that the terms used herein should be interpreted as having a meaning that is consistent with the context of this specification and should not be interpreted in an idealized or overly formal sense.
Where a convention analogous to "at least one of A, B and C, etc." is used, in general such a construction should be interpreted in the sense one having ordinary skill in the art would understand the convention to include, for example, "a system having at least one of A, B and C" would include but not be limited to systems having a alone, B alone, C alone, a and B, a and C, B and C, and/or A, B, C, etc.
Fig. 1 schematically illustrates an optical frequency hopping communication system according to an embodiment of the present disclosure.
According to the embodiment of the present disclosure, the transmitter 100 is configured to modulate two paths of user data on a first carrier signal and a second carrier signal respectively to generate a first data signal and a second data signal, and couple the first data signal and the second data signal to transmit a transmission signal, where frequencies of the first carrier signal and the second carrier signal hop on two frequencies based on opposite frequency hopping sequences, and wavelengths of the first carrier signal and the second carrier signal at the same time are complementary; the receiver 200 is configured to receive the transmission signal, separate the transmission signal into a first frequency signal and a second frequency signal based on frequency, recover the first data signal and the second data signal based on the same frequency hopping sequence as that of the transmitter 100, and demodulate the first data signal and the second data signal to obtain two paths of user data.
According to the embodiment of the present disclosure, as shown in fig. 1, the optical frequency hopping communication system transmitter 100 includes a phase modulation module 110, a frequency modulation module 120, a data modulation module 130, and a transmission signal forming module 140. The optical frequency hopping communication system receiver 200 includes a second filtering module 210, a modulated carrier recovery module 220, and a signal demodulation module 230.
The phase modulation module 110 is configured to generate a waveform signal, a first radio frequency signal, and a second radio frequency signal, where a phase difference between the waveform signal and the first radio frequency signal hops with a frequency hopping sequence, and a phase difference between the waveform signal and the second radio frequency signal hops with an opposite frequency hopping sequence. As shown in fig. 2, the phase modulation module 110 includes a waveform generator 111, a power amplifier 112, a first hopping sequence generator 113, a phase modulation unit 114, and an inverter 115. The phase modulation unit 114 further includes a first phase-tunable instrument 114A and a second phase-tunable instrument 114B.
The arbitrary waveform generator 111 can provide an arbitrary waveform such as a sine wave, a sawtooth wave, a square wave, or the like. According to an embodiment of the present disclosure, the arbitrary waveform generator 111 is used to generate the frequency ω f Is a waveform signal. The waveform generator 111 is connected to a power amplifier 112, and the power amplifier 112 amplifies the waveform signal.
The power amplifier 112 is connected to the first phase-adjustable instrument 114A and the second phase-adjustable instrument 114B, and amplifies the waveform signals and inputs the amplified waveform signals to the first phase-adjustable instrument 114A and the second phase-adjustable instrument 114B, respectively.
A first hopping sequence generator 113 for generating a hopping sequence. According to the embodiment of the present disclosure, the hopping sequence may be a hopping sequence code based on a pseudo random sequence, such as an M-sequence, an M-sequence Gold sequence, etc., or may be a hopping sequence code based on number theory, such as an RS code.
The phase modulation unit 114 includes a first phase-adjustable instrument 114A and a second phase-adjustable instrument 114B, the first frequency hopping sequence generator 113 is connected to the first phase-adjustable instrument 114A, and the first frequency hopping sequence generator 113 is connected to the inverter 115 and then connected to the second phase-adjustable instrument 114B. . First phase-tunable instrument 114A modulates the phase of the waveform signal based on the frequency hopping sequence to generate a first radio frequency signal, and second phase-tunable instrument 114B modulates the phase of the waveform signal based on the opposite frequency hopping sequence to generate a second radio frequency signal. According to the embodiment of the present disclosure, a specific adjustment manner may be as shown in fig. 3, assuming that the waveform signal is Sin (wt), when the symbol of the frequency hopping sequence at a certain moment is 0, the first phase-tunable instrument 114A shifts the phase of the waveform signal by + pi/2, and then obtains the first radio frequency signal Sin (wt + pi/2). The symbol 0 of the frequency hopping sequence becomes 1 after passing through the inverter 115, and the second phase-adjustable instrument 114B shifts the phase of the waveform signal by-pi/2, thereby obtaining a second radio frequency signal Sin (wt-pi/2). When the symbol of the frequency hopping sequence at a certain moment is 1, the first phase-tunable instrument 114A shifts the phase of the waveform signal by-pi/2, and then a first radio frequency signal Sin (wt-pi/2) is obtained. The symbol 1 of the frequency hopping sequence becomes 0 after passing through the inverter 115, and the second phase-adjustable instrument 114B shifts the phase of the waveform signal by + pi/2, thereby obtaining a second radio frequency signal Sin (wt + pi/2). It can be seen that the phase modulation unit 114 makes the phase of the waveform signal jump between ± pi/2 based on the series of hopping sequences generated by the hopping sequence generator 113, and makes the phase jump laws of the first radio frequency signal and the second radio frequency signal opposite based on the opposite hopping sequences.
According to the embodiment of the present disclosure, the frequency modulation module 120 is configured to generate a laser signal, modulate the laser signal based on the waveform signal and the first radio frequency signal, generate a first carrier signal, modulate the laser signal based on the waveform signal and the second radio frequency signal, and generate a second carrier signal. The frequency modulation module 120 includes a continuous laser 121, a first coupler 122, a frequency hopping modulation unit 123, and a first filtering unit 124. Frequency hopping modulating section 123 includes a first dual-drive mach-zehnder modulator 123A and a second dual-drive mach-zehnder modulator 123B, and first filtering section 124 includes a first optical notch filter 124A and a second optical notch filter 124B.
A continuous wave laser 111 connected to the first coupler 112 for generating a frequency ω c The laser signal of (1);
a first coupler 112 connected to the first dual-drive mach-zehnder modulator 123A and the second dual-drive mach-zehnder modulator 123B, respectively, for inputting a laser signal into the first dual-drive mach-zehnder modulator 123A and the second dual-drive mach-zehnder modulator 123B;
according to the embodiment of the present disclosure, the frequency hopping modulation unit 123 includes a first dual-drive mach-zehnder modulator 123A and a second dual-drive mach-zehnder modulator 123B, the first dual-drive mach-zehnder modulator 123A is configured to modulate a waveform signal and a first radio frequency signal onto a laser signal to generate a first carrier signal, and the second dual-drive mach-zehnder modulator 123B is configured to modulate the waveform signal and a second radio frequency signal onto the laser signal to generate a second carrier signal.
Each double drive MachThe operating principle of the delta modulator is shown in fig. 4. Setting laser signal E input to each dual-drive Mach-Zehnder modulator in Comprises the following steps:
E c for inputting an electric field E in The amplitude of (d). j is the imaginary part of the complex number, ω c For the laser signal E in T is time.
Setting the signals loaded on the two arms of the dual-drive Mach-Zehnder modulator as v RF_a ，v RF_b And the DC offset signal is v bias To obtain the output optical field E of the dual-drive Mach-Zehnder modulator out ：
Wherein the modulation index
Phi is controlled by DC bias and determined by the phase difference of the signals applied to the two arms, J n (β) refers to a Bessel function of order n.
Get
Only the zero-order, plus-minus first-order sidebands k =0 are considered for small signals, when:
1.
2.
obviously, the DC bias is controlled to make the phase difference between the two arms
And simultaneously, the radio frequency signals loaded by the upper arm and the lower arm are controlled to randomly switch the phase difference phi between +/-pi/2, so that the single-sideband modulation under the control of the pseudorandom sequence can be realized.
As shown in fig. 2, the first double-drive mach-zehnder modulator 123A loads the waveform signal and the first radio frequency signal on the laser signal to generate a first carrier signal; the second double-drive mach-zehnder modulator 123B loads the waveform signal and the second radio-frequency signal on the laser signal, generating a second carrier signal. When the frequency of the laser signal is omega c Frequency of waveform signal is ω f The frequencies of the first carrier signal and the second carrier signal generated by the first dual-drive mach-zehnder modulator 123A and the second dual-drive mach-zehnder modulator 123B each include ω c -ω f ，ω c ，ω c +ω f These three frequencies.
A first filtering unit 240 for including a first optical notch filter 124A and a second optical notch filter 124B for filtering the center frequencies of the first carrier signal and the second carrier signal, respectively. As shown in fig. 2, the first filtering unit 240 includes a first optical notch filter 124A and a second optical notch filter 124B. The first optical notch filter 124A and the second optical notch filter 124B are both at a carrier frequency ω c The single-peak optical notch filter of (1). It can be understood that all types of optical notch filters mentioned in the present disclosure are not limited, the filter bandwidth is about 0.8nm, and the out-of-band rejection ratio is 20dB, and the optical notch filters may be filters based on the fiber bragg grating FBG principle, or filters based on the fabry-perot resonator FP principle.
The first optical notch filter 124A and the second optical notch filter 124B combine the first carrier signal and the second carrier signalCenter frequency omega in two-carrier signal c After filtering, the result is shown in fig. 7, and the frequencies of the first carrier signal and the second carrier signal only include ω c -ω f ，ω c +ω f And the first carrier signal and the second carrier signal are frequency shift keyed signals of complementary wavelengths.
According to the embodiment of the present disclosure, the data modulation module 130 is configured to modulate two paths of user data on a first carrier signal and a second carrier signal, respectively, to generate a first data signal and a second data signal. As shown in fig. 2, the DATA modulation module 130 includes a first PAM4 signal modulation module 131 and a second PAM4 signal modulation module 132 for modulating the user DATA1 and the user DATA2 on a first carrier signal and a second carrier signal, respectively, to generate a first DATA signal and a second DATA signal.
According to the embodiment of the present disclosure, the transmitter 100 further includes a preprocessing encryption module 150 connected to the data modulation module 130, for encrypting each path of user data. The encryption method can be as shown in FIG. 5, where the data before encryption is set as A 0 A 1 The encryption mode is with S 0 S 1 XOR, the encrypted data is B 0 B 1 . Suppose S 0 S 1 Is 00, when A 0 A 1 When the number is 00, the encrypted data is B 0 B 1 Is 11; when A is 0 A 1 When 01, the encrypted data is B 0 B 1 Is 10; when A is 0 A 1 When it is 10, the encrypted data is B 0 B 1 Is 01; when A is 0 A 1 When it is 11, the encrypted data is B 0 B 1 Is 00. The security of the DATA can be further improved by the encryption of the user DATA1 and the user DATA 2.
According to the embodiment of the present disclosure, the transmission signal forming module 140 couples the first data signal and the second data signal into a transmission signal. As shown in fig. 2, the transmission signal forming module 140 includes a second coupler 141. The second coupler 141 couples the first data signal and the second data signal into a single transmission signal for transmission. Since the frequencies of the first DATA signal and the second DATA signal randomly hop at two frequencies, the user DATA1 and the user DATA2 are divided into different segments and randomly hop in two channels during the transmission of the transmitted signal.
According to the embodiment of the present disclosure, the second filtering module 210 is configured to separate the transmission signal and generate a first frequency signal and a second frequency signal with different frequencies. The second filtering module 210 includes a third coupler 211, a third optical notch filter 212A, and a fourth optical notch filter 212B. After the transmission signals received by the receiver 200, the third coupler 211 is used to transmit the transmission signals to the carrier frequencies ω c +ω f Third optical notch filter 212A and carrier frequency ω c -ω f Is a fourth optical notch filter 212B. FIG. 8 schematically shows the frequency division of the transmitted signal at a frequency ω c -ω f First frequency signal sum ω c +ω f A second frequency signal. The distribution of the user DATA1 and the user DATA2 on the first frequency signal and the second frequency signal is shown in fig. 9.
According to the embodiment of the present disclosure, the modulated carrier recovery module 220 is configured to output the segments of the first frequency signal and the second frequency signal alternately based on the same frequency hopping sequence as the transmitter 100 to recover the first data signal and the second data signal. The modulated carrier recovery module 220 includes a second hopping sequence generator 221 and a2 x 2 optical switch 222.
The second hopping sequence generator 221 is for generating the same hopping sequence as the transmitter 100. And a2 × 2 optical switch 222, a voltage control terminal of which is connected to the second frequency hopping sequence generator 221, for controlling a communication state between its own input terminal and output terminal based on the frequency hopping sequence, so as to alternately output segments of the first frequency signal and the second frequency signal based on the frequency hopping sequence, and form the first data signal and the second data signal.
The 2X 2 optical switch can change the connection state of the input end and the output end under the control of voltage, namely when the voltage is high voltage, the input end 1 is communicated with the output end 1, the input end 2 is communicated with the output end 2, and the output frequency of the output end 1 is omega c -ω f Signal of (2), output terminalOutput frequency of omega c +ω f The signal of (a); when the voltage is low, the input end 1 is communicated with the output end 2, the input end 2 is communicated with the output end 1, and the output frequency of the output end 1 is omega c +ω f Of which the output 2 outputs a signal of frequency omega c -ω f Of the signal of (a). The voltage of the 2 × 2 optical switch is controlled to change through the frequency hopping sequence, so as to control the frequency of the signals output by the output terminals 1 and 2 of the 2 × 2 optical switch to change continuously, thereby recovering the first data signal and the second data signal.
According to the embodiment of the present disclosure, the signal demodulating module 230 is configured to demodulate the first data signal and the second data signal to obtain each path of user data.
According to an embodiment of the present disclosure, the receiver 200 further includes: the decryption module 240 is configured to decrypt each path of user data based on the encryption manner of the preprocessing module 150.
The present disclosure also provides an optical frequency hopping communication method, which is applied to the optical frequency hopping system as shown above. As shown in fig. 6, the method includes:
s601, respectively modulating two paths of user data on a first carrier signal and a second carrier signal to generate a first data signal and a second data signal, and coupling the first data signal and the second data signal into a transmitting signal for transmitting, wherein the frequencies of the first carrier signal and the second carrier signal are respectively hopped on two frequencies based on opposite hopping sequences, and the wavelengths of the first carrier signal and the second carrier signal at the same moment are complementary;
s602, receiving the transmission signal, separating into a first frequency signal and a second frequency signal based on frequency, recovering the first data signal and the second data signal based on the same frequency hopping sequence as the transmitter 100, and demodulating to obtain two paths of user data.
The present disclosure provides a system framework of an optical frequency hopping communication mechanism, which can be applied to the secure transmission of PAM4 signals. The transmitter 100 realizes the random hopping of the frequency of the carrier signal under the control of the frequency hopping sequence, and realizes that the user data is divided into segments and transmitted by different physical channels in the transmission process by loading the user data on the carrier signal with the random hopping of the frequency, so that the data can be effectively hidden, the interception by an illegal third party is prevented, and the safety of data transmission is further improved.
It will be appreciated by a person skilled in the art that various combinations or/and combinations of features recited in the various embodiments of the disclosure and/or in the claims may be made, even if such combinations or combinations are not explicitly recited in the disclosure. In particular, various combinations and/or combinations of the features recited in the various embodiments and/or claims of the present disclosure may be made without departing from the spirit or teaching of the present disclosure. All such combinations and/or associations are within the scope of the present disclosure.
The embodiments of the present disclosure have been described above. However, these examples are for illustrative purposes only and are not intended to limit the scope of the present disclosure. Although the embodiments are described separately above, this does not mean that the measures in the embodiments cannot be used in advantageous combination. The scope of the disclosure is defined by the appended claims and equivalents thereof. Various alternatives and modifications can be devised by those skilled in the art without departing from the scope of the present disclosure, and such alternatives and modifications are intended to be within the scope of the present disclosure.
Claims (10)
1. An optical frequency hopping communication system, comprising:
a transmitter (100) configured to modulate two paths of user data on a first carrier signal and a second carrier signal, respectively, generate a first data signal and a second data signal, and couple the first data signal and the second data signal to transmit a transmission signal, where frequencies of the first carrier signal and the second carrier signal hop on two frequencies based on opposite hopping sequences, respectively, and wavelengths of the first carrier signal and the second carrier signal at the same time are complementary to each other;
the transmitter (100) comprises:
a phase modulation module (110) for generating a waveform signal, a first radio frequency signal and a second radio frequency signal, wherein a phase difference between the waveform signal and the first radio frequency signal jumps with the frequency hopping sequence, a phase difference between the waveform signal and the second radio frequency signal jumps with the opposite frequency hopping sequence, and a phase of the waveform signal jumps within ± pi/2;
and the receiver (200) is used for receiving the transmitting signal, separating the transmitting signal into a first frequency signal and a second frequency signal based on frequency, recovering the first data signal and the second data signal based on the same frequency hopping sequence as the transmitter (100), and demodulating to obtain two paths of user data.
2. The optical frequency hopping communication system according to claim 1, wherein said transmitter (100) comprises:
a frequency modulation module (120) configured to generate a laser signal, modulate the laser signal based on the waveform signal and the first radio frequency signal, generate the first carrier signal, modulate the laser signal based on the waveform signal and the second radio frequency signal, and generate the second carrier signal;
a data modulation module (130) configured to modulate the two paths of user data on the first carrier signal and the second carrier signal, respectively, to generate the first data signal and the second data signal;
a transmit signal forming module (140) for coupling the first data signal and the second data signal as the transmit signal.
3. The optical frequency hopping communication system according to claim 1, wherein said receiver (200) comprises:
a second filtering module (210) for separating the transmission signal to generate the first frequency signal and the second frequency signal with different frequencies;
a modulated carrier recovery module (220) for alternately outputting segments of the first frequency signal and the second frequency signal based on the same hopping sequence as the transmitter (100) to recover the first data signal and the second data signal;
and a signal demodulation module (230) for demodulating the first data signal and the second data signal to obtain each path of the user data.
4. The optical frequency hopping communication system of claim 2, wherein the phase modulation module (110) comprises:
a first hopping sequence generator (113) for generating the hopping sequence;
a phase modulation unit (114) comprising a first phase-tunable instrument 114A and a second phase-tunable instrument 114B, wherein the first phase-tunable instrument 114A modulates the phase of the waveform signal based on the frequency hopping sequence to generate the first radio frequency signal, and the second phase-tunable instrument 114B modulates the phase of the waveform signal based on the opposite frequency hopping sequence to generate the second radio frequency signal.
5. The optical frequency hopping communication system according to claim 2, wherein the frequency modulation module (120) comprises:
the continuous wave laser (121) is connected with the frequency hopping modulation unit (123) and is used for generating the laser signal;
a frequency hopping modulation unit (123) including a first dual-drive Mach-Zehnder modulator (123A) and a second dual-drive Mach-Zehnder modulator (123B), the first dual-drive Mach-Zehnder modulator (123A) configured to modulate the waveform signal and the first radio-frequency signal on the laser signal to generate the first carrier signal, and the second dual-drive Mach-Zehnder modulator (123B) configured to modulate the waveform signal and the second radio-frequency signal on the laser signal to generate the second carrier signal;
a first filtering unit (124) comprising a first optical notch filter (124A) and a second optical notch filter (124B) for filtering the center frequencies of the first carrier signal and the second carrier signal, respectively.
6. The optical frequency hopping communication system according to claim 2, wherein said transmitter (100) further comprises:
and the preprocessing encryption module (150) is connected with the signal modulation module (130) and is used for encrypting each path of user data.
7. The optical frequency hopping communication system of claim 3, wherein the modulated carrier recovery module (220) further comprises:
a second hopping sequence generator (221) for generating the same hopping sequence as the transmitter (100);
and the voltage control end of the 2 x 2 optical switch (222) is connected with the second frequency hopping sequence generator (221) and is used for controlling the communication state between the input end and the output end of the optical switch based on the frequency hopping sequence so as to realize that the segments of the first frequency signal and the second frequency signal are alternately output based on the frequency hopping sequence to form the first data signal and the second data signal.
8. The optical frequency hopping communication system according to claim 6, wherein said receiver (200) further comprises:
and the decryption module (240) is used for decrypting each path of user data based on the encryption mode of the preprocessing module (150).
9. Optical frequency hopping communication system according to claim 1, wherein said hopping sequences are one of M-sequences, gold sequences, RS sequences.
10. An optical frequency hopping communication method, comprising:
modulating two paths of user data on a first carrier signal and a second carrier signal respectively to generate a first data signal and a second data signal, and coupling the first data signal and the second data signal into a transmitting signal for transmitting, wherein the frequencies of the first carrier signal and the second carrier signal hop on two frequencies based on opposite frequency hopping sequences respectively, and the wavelengths of the first carrier signal and the second carrier signal at the same moment are complementary;
generating a waveform signal, a first radio frequency signal and a second radio frequency signal, wherein the phase difference of the waveform signal and the first radio frequency signal jumps along with the frequency hopping sequence, the phase difference of the waveform signal and the second radio frequency signal jumps along with the opposite frequency hopping sequence, and the phase of the waveform signal jumps within +/-pi/2;
receiving the transmission signal, separating into a first frequency signal and a second frequency signal based on frequency, recovering the first data signal and the second data signal based on the same frequency hopping sequence as the transmitter (100), and demodulating to obtain two paths of user data.
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| CN110212989A (en) * | 2019-06-11 | 2019-09-06 | 南京航空航天大学 | RF hopping signal generating method and device based on circulating frequency shift |
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