CN114696918B - Communication device and communication method thereof - Google Patents
Communication device and communication method thereof Download PDFInfo
- Publication number
- CN114696918B CN114696918B CN202011596225.XA CN202011596225A CN114696918B CN 114696918 B CN114696918 B CN 114696918B CN 202011596225 A CN202011596225 A CN 202011596225A CN 114696918 B CN114696918 B CN 114696918B
- Authority
- CN
- China
- Prior art keywords
- signal
- laser
- optical
- hidden
- light
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- H04B10/85—Protection from unauthorised access, e.g. eavesdrop protection
-
- 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
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/505—Laser transmitters using external modulation
-
- 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
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/54—Intensity modulation
Landscapes
- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
Abstract
The present disclosure provides a communication apparatus including: an arbitrary waveform generator for generating a concealment signal and transmitting the concealment signal to a laser; the laser is used for generating laser and tuning the laser by utilizing the hiding signal to generate first laser; a pattern generator for generating a host signal; a modulator for receiving the first laser light and the host signal, modulating the host signal onto the first laser light, and generating a second laser light; the optical coupler is connected with the modulator through a single-mode fiber and is used for receiving the second laser and dividing the second laser into a first optical signal and a second optical signal; a first photodetector for detecting a host signal contained in the first optical signal; the optical filter is used for receiving the second optical signal, filtering the second optical signal and generating a third optical signal; and the second light detector is used for detecting the hidden signal contained in the third optical signal. The present disclosure also provides a communication method.
Description
Technical Field
The present disclosure relates to the field of secure communications, and in particular, to a communication device and a communication method thereof.
Background
Fiber optic communication technology has been widely used at various levels of network transmission. With the gradual trend of network and information security, the important consideration factors of personal privacy, business confidentiality and national strategic security are maintained, and the improvement of the security guarantee of optical fiber communication is also an important research subject.
In the prior art, encrypting transmission signals for optical fiber communication is the most common method for maintaining information security. By coding and encrypting the original transmission information, a certain security guarantee is provided at the data layer. Encryption technology does not have stable security, however, and an attacker can fully crack the encrypted data if the powerful processing functions of the computer are used.
Disclosure of Invention
In view of this, to overcome at least one aspect of the above-described problems, the present disclosure provides a communication apparatus including: an arbitrary waveform generator, a laser, a code pattern generator, a modulator, a single-mode fiber, an optical coupler, an optical filter, a first optical detector and a second optical detector;
the arbitrary waveform generator is used for generating a hidden signal and sending the hidden signal to the laser, and the hidden signal is used for tuning the wavelength of laser;
the laser is used for generating laser and tuning the laser by utilizing the hiding signal to generate first laser;
the code pattern generator is used for generating a host signal;
the modulator is used for receiving the first laser and the host signal, modulating the host signal onto the first laser and generating a second laser;
the optical coupler is connected with the modulator through the single-mode optical fiber and is used for receiving the second laser and dividing the second laser into a first optical signal and a second optical signal;
the first light detector is used for receiving and detecting host signals contained in the first light signals;
the optical filter is used for receiving the second optical signal, filtering the second optical signal and generating a third optical signal;
the second photodetector is configured to receive and detect a hidden signal included in the third optical signal.
Optionally, the second photodetector is configured to restore the hidden signal from the third optical signal.
Optionally, the laser is a distributed bragg reflection laser, and includes a gain region, a phase region, and a grating region, where the phase region is a passive waveguide.
Optionally, a phase region of the laser is connected to the arbitrary waveform generator, and is used for tuning a wavelength of the laser by using the hiding signal to generate the first laser.
Optionally, the hidden signal is an electrical signal whose voltage or current changes according to a preset rule.
Optionally, the optical filter is configured to filter out an optical signal having a wavelength that does not meet a preset value.
Optionally, the optical filter is a notch filter, or a bandpass filter.
Optionally, the first photodetector is configured to restore the host signal from the second optical signal.
Optionally, the optical coupler has a split ratio of 1:9.
the disclosure also provides a communication method, based on the communication device of any one of the above, the method includes:
the arbitrary waveform generator generates a hidden signal and sends the hidden signal to the laser, wherein the hidden signal is used for tuning the wavelength of laser;
the laser generates laser light, and tunes the laser light by utilizing the hiding signal to generate first laser light;
the pattern generator generates a host signal;
the modulator receives the first laser and the host signal, modulates the host signal onto the first laser, generates second laser, and transmits the second laser to the optical coupler through a single-mode fiber;
an optical coupler receives the second laser, separates the second laser into a first optical signal and a second optical signal, transmits the first optical signal to a first optical detector, and transmits the second optical signal to an optical filter;
the first light detector receives and detects a host signal contained in the first light signal;
the optical filter receives the second optical signal, filters the second optical signal to obtain a third optical signal, and transmits the third optical signal to a second optical detector;
the second light detector receives and detects a hidden signal contained in the third light signal.
Compared with the prior art, the method has the following beneficial effects:
1. the hidden signal only changes the wavelength of the laser, and the optical power of the laser is not changed, so that normal communication and hidden communication can be synchronously carried out, and the two paths of signals are not mutually interfered.
2. The hidden signal containing the secret information is hidden in the host signal, the modulated optical signal is directly detected by the optical detector, the existence of the hidden signal cannot be identified, and the safety performance of the hidden information is enhanced.
3. Compared with a common optical fiber communication device, the device only needs to be added with the generating device and the optical filter for generating the hidden signal, has simple structure, is easy to build and has good integrality.
Drawings
For a more complete understanding of the present disclosure and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which:
fig. 1 schematically illustrates a schematic diagram of a communication device of an embodiment of the present disclosure;
fig. 2 schematically illustrates a structural schematic of a laser of an embodiment of the present disclosure;
FIG. 3 schematically illustrates a voltage plot of a hidden signal of an embodiment of the present disclosure;
FIG. 4 schematically illustrates a wavelength time domain plot of a first laser of an embodiment of the present disclosure;
FIG. 5 schematically illustrates an electrical signal plot of a second detector output of an embodiment of the present disclosure;
fig. 6 schematically illustrates a flow chart of a communication method of an embodiment of the present disclosure.
Detailed Description
In order to more clearly illustrate the embodiments of the present disclosure or the prior art, the drawings that are required for use in the embodiments or prior art description will be briefly described below, it being apparent that these descriptions are merely exemplary and are not intended to limit the scope of the present disclosure. Other figures can be obtained from these figures without inventive effort for the person skilled in the art. 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 present disclosure. Unless defined otherwise, technical or scientific terms used in this disclosure should be given the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs.
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/or 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.
Fig. 1 schematically illustrates a schematic diagram of a communication device according to an embodiment of the present disclosure. As shown in fig. 1, the present disclosure provides a communication apparatus 100 including: an arbitrary waveform generator 1, a laser 2, a code pattern generator 3, a modulator 4, a single mode fiber 5, an optical coupler 6, a first optical detector 7, an optical filter 8 and a second optical detector 9;
the arbitrary waveform generator 1 is configured to generate a concealment signal and send the concealment signal to the laser 2, where the concealment signal is used to tune the wavelength of laser light;
the laser 2 is used for generating laser light, and tuning the laser light by utilizing the hiding signal to generate first laser light;
the pattern generator 3 is used for generating a host signal;
the modulator 4 is configured to receive the first laser light and the host signal, modulate the host signal onto the first laser light, and generate a second laser light;
the optical coupler 6 is connected with the modulator 4 through the single-mode optical fiber 5 and is used for receiving the second laser and dividing the second laser into a first optical signal and a second optical signal;
the first photodetector 7 is configured to receive and detect a host signal contained in the first optical signal;
the optical filter 8 is configured to receive the second optical signal, filter the second optical signal, and generate a third optical signal;
the second photodetector 9 is configured to receive and detect a hidden signal included in the third optical signal.
In the disclosed embodiment, the hidden signal containing the secret information wavelength tunes the laser light generated by the laser 3, but does not change the power level of the laser light, i.e. does not change the intensity of the laser light. In the modulator 3, the host signal is modulated on the first laser beam, and the intensity of the first laser beam is changed to generate the second laser beam. Meanwhile, since the first detector 7 and the second detector 9 can only detect the intensity of the laser light, the first detector 7 can detect the known host signal contained in the laser light, and restore the host signal from the second optical signal, but cannot detect the unknown hidden signal contained in the laser light. For the second detector 9, the optical filter 8 may filter out the laser light with the center wavelength outside the passband of the filter and the known host signal according to the preset filtering condition, so that the optical signal detected by the second detector 9 only includes the hidden signal, and the hidden signal may be recovered from the third optical signal, thereby obtaining the secret information in the hidden signal.
By implementing the method, the information needing to be kept secret is hidden in the host signal as the hidden signal, and the hidden signal is transmitted together in the optical fiber through the laser, so that a third party does not know the existence of the kept secret information except a sending end and a target receiving end, and the safety performance of the hidden information is enhanced. Meanwhile, the original laser strength is not changed in the process of tuning the laser, so that the normal communication of host signals is not affected in the transmission process, the host signals and the hidden signals are not interfered with each other, the hiding effect is good, the information safety is improved, the communication device is simple in structure, easy to build and good in integrality.
As an alternative embodiment, the arbitrary waveform generator 1 generates a hidden signal, which is an electrical signal in which the voltage or current changes with a preset rule. In particular, the concealment signal is a square wave electrical signal whose level varies with time. The square wave electrical signal whose voltage varies with time can tune the wavelength of the laser light generated by the laser 2 without changing the power level of the laser light.
As an alternative embodiment, the laser 2 is a distributed bragg reflector (distributed Bragg reflector, DBR) laser. Fig. 2 schematically shows a schematic structural diagram of a laser of an embodiment of the present disclosure. As shown in fig. 2, the DBR laser 2 includes a gain region 10, a phase region 11, and a grating region 12, wherein the phase region 11 is a passive waveguide. The arbitrary waveform generator 1 is connected with the phase region 11 of the laser 2 through a cable, and the hidden signal generated by the arbitrary waveform generator 1 tunes the wavelength of the laser through the phase region 11 without changing the power of the laser.
Fig. 3 schematically illustrates a voltage plot of a concealment signal of an embodiment of the present disclosure, and fig. 4 schematically illustrates a wavelength time domain plot of a first laser of an embodiment of the present disclosure. As shown in fig. 3, the hidden signal outputted from the arbitrary waveform generator 1 is a square wave signal with a frequency of 1MHz, and has a high level of 600mV and a low level of 300mV. The arbitrary waveform generator 1 is connected to the phase region 11 of the DBR laser 2. The wavelength of the laser light output from the DBR laser 2 changes with time under the modulation of the hidden signal. As shown in fig. 4, the wavelength of the first laser light output from the DBR laser is at λ 1 (1549.6 nm) and lambda 2 And (1549.9 nm) switching at a frequency of 1MHz, wherein the wavelength switching rule of the first laser is the same as the switching rule of the high level and the low level in the hidden signal, and the first laser comprises the switching information of the square wave. Only the wavelength of the first laser changes with time and the power is unchanged. Those skilled in the art may select an electrical signal having a different variation rule of current or voltage as the hidden signal according to actual requirements, and the disclosure herein does not limit the voltage variation property of the hidden signal. Meanwhile, the kind of the laser and the type of laser generated by the laser are not limited herein.
The pattern generator 3 is connected to the modulator 4 by a cable, and transmits a host signal to the modulator 4. The host signal is modulated onto the first laser light by the modulator 4 to generate a second laser light. The power of the second laser is changed relative to the power of the first laser after intensity modulation, but the wavelength of the laser is not changed.
As an alternative embodiment, the optical coupler 6 is connected to the modulator 4 through the single-mode optical fiber 5, receives the second laser light sent by the modulator 4, and divides the second laser light into a first optical signal and a second optical signal. The length of the single-mode fiber 5 is 25km, the spectral ratio of the optical coupler 6 is 1:9, the power of the first optical signal received by the first optical detector 7 is 90% of the power of the second laser, and the power of the second optical signal received by the optical filter 8 is 10% of the power of the second laser. The length of the single-mode fiber 5 and the spectral ratio of the optical coupler 6 can be set by those skilled in the art according to actual requirements, and the present disclosure is not limited herein to the length of the single-mode fiber 5 and the spectral ratio of the optical coupler 6.
As an alternative embodiment, the optical filter 8 is configured to filter out optical signals having wavelengths that do not meet a preset value. The optical filter 8 may specifically be a notch filter, or a band-pass filter. Since the photodetector can only detect the intensity of the optical signal and cannot detect the wavelength change of the optical signal, the photodetector cannot directly detect the wavelength switching information contained in the optical signal. The optical signal with a specific wavelength is filtered out by the optical filter 8, i.e. when the optical signal is switched to this specific wavelength, the intensity of the optical signal at this time is almost 0, while when the optical signal is switched to another wavelength, the optical signal still maintains its original intensity. When the second photodetector 9 detects the intensity of the second optical signal, the intensity switching law of the second optical signal can be detected, so that the intensity of the modulated optical signal is realized by filtering out the optical signal with a specific wavelength. Specifically, the optical filter 8 may be configured to filter out wavelengths λ 2 (1549.9 nm) laser light of wavelength lambda only 1 (1549.6 nm) laser light.
When the wavelength of the second optical signal is 1549.6nm, the optical power entering the second optical detector 9 is not zero, and when the wavelength of the second optical signal is 1549.9nm, the second optical signal is filtered by the optical filter 8, and the optical power entering the second optical detector 9 is zero. Specifically, as shown in fig. 5, the electrical signals output from the second photodetector 9 are "0" and "1" signals having a frequency of 1 MHz. The switching rule of the electric signal is consistent with the switching rule of the high and low levels of the hidden signal. The electrical signal output by the second photodetector 9 is the hidden signal transmitted in the hidden communication.
Meanwhile, the first optical detector 7 detects the optical signal of the first optical signal subjected to intensity modulation by the modulator 4, and the optical detector only detects the intensity of the optical signal, so that the wavelength change of the light cannot be detected, and the intensity of the optical signal does not change during wavelength switching, so that the first optical detector 7 cannot detect the wavelength switching rule. The electrical signal output by the first photodetector 7 is determined by the output host signal of the pattern generator 3. For example, the pattern generator 3 outputs an NRZ signal of 25Gb/s as a host signal, and the electrical signal output by the first photodetector 7 is an NRZ signal of 25Gb/s corresponding thereto. The signal is the transmission host electric signal in normal communication.
The present disclosure provides a detailed communication method, which is suitable for the communication device described above, and fig. 6 is a schematic flowchart of a communication method according to an embodiment of the present disclosure.
As shown in fig. 6, the optical fiber communication method at least includes the following steps:
s1, generating a hidden signal by an arbitrary waveform generator and sending the hidden signal to the laser, wherein the hidden signal is used for tuning the wavelength of laser;
s2, the laser generates laser light, and the hidden signal is utilized to tune the laser light to generate first laser light;
s3, generating a host signal by a code pattern generator;
s4, the modulator receives the first laser and the host signal, modulates the host signal onto the first laser, generates second laser, and transmits the second laser to the optical coupler through a single-mode fiber;
s5, an optical coupler receives the second laser, divides the second laser into a first optical signal and a second optical signal, transmits the first optical signal to a first optical detector, and transmits the second optical signal to an optical filter;
s6, the first light detector receives and detects host signals contained in the first light signals;
s7, the optical filter receives the second optical signal, filters the second optical signal to obtain a third optical signal, and transmits the third optical signal to a second optical detector;
s8, the second light detector receives and detects the hidden signal contained in the third light signal.
It should be noted that, in the embodiments of the present disclosure, the communication method corresponds to the communication device portion in the embodiments of the present disclosure, and the description of the communication method specifically refers to the communication device portion and is not described herein again.
It should also be noted that, in the embodiments of the present disclosure, the features of the embodiments and the embodiments of the present disclosure may be combined with each other to obtain new embodiments without conflict.
Finally, it should be noted that the above embodiments are merely for illustrating the technical solutions of the present disclosure and not for limiting, and although the present disclosure has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the technical solutions of the present disclosure without departing from the spirit and scope of the technical solutions of the present disclosure.
Claims (10)
1. A communication device, comprising:
an arbitrary waveform generator, a laser, a code pattern generator, a modulator, a single-mode fiber, an optical coupler, an optical filter, a first optical detector and a second optical detector;
the arbitrary waveform generator is used for generating a hidden signal and sending the hidden signal to the laser, and the hidden signal is used for tuning the wavelength of laser;
the laser is used for generating laser and tuning the laser by utilizing the hiding signal to generate first laser;
the code pattern generator is used for generating a host signal;
the modulator is used for receiving the first laser and the host signal, modulating the host signal onto the first laser and generating a second laser;
the optical coupler is connected with the modulator through the single-mode optical fiber and is used for receiving the second laser and dividing the second laser into a first optical signal and a second optical signal;
the first light detector is used for receiving and detecting host signals contained in the first light signals;
the optical filter is used for receiving the second optical signal, filtering the second optical signal and generating a third optical signal;
the second photodetector is configured to receive and detect a hidden signal included in the third optical signal.
2. The apparatus of claim 1, wherein the second light detector is configured to recover the hidden signal from the third light signal.
3. The apparatus of claim 1, wherein the laser is a distributed bragg reflector laser comprising a gain region, a phase region, and a grating region, the phase region being a passive waveguide.
4. The apparatus of claim 3 wherein a phase region of the laser is coupled to the arbitrary waveform generator for tuning a wavelength of the laser light with the hidden signal to generate the first laser light.
5. The device of claim 1, wherein the hidden signal is an electrical signal whose voltage or current varies with a predetermined law.
6. The apparatus of claim 1, wherein the optical filter is configured to filter out optical signals having wavelengths that do not meet a predetermined value.
7. The apparatus of claim 1, wherein the optical filter is a notch filter, or a bandpass filter.
8. The apparatus of claim 1, wherein the first light detector is configured to recover the host signal from the second light signal.
9. The apparatus of claim 1, wherein the optical coupler has a split ratio of 1:9.
10. a communication method, characterized in that it is based on a communication device according to any of claims 1-9, the method comprising:
the arbitrary waveform generator generates a hidden signal and sends the hidden signal to the laser, wherein the hidden signal is used for tuning the wavelength of laser;
the laser generates laser light, and tunes the laser light by utilizing the hiding signal to generate first laser light;
the pattern generator generates a host signal;
the modulator receives the first laser and the host signal, modulates the host signal onto the first laser, generates second laser, and transmits the second laser to the optical coupler through a single-mode fiber;
an optical coupler receives the second laser, separates the second laser into a first optical signal and a second optical signal, transmits the first optical signal to a first optical detector, and transmits the second optical signal to an optical filter;
the first light detector receives and detects a host signal contained in the first light signal;
the optical filter receives the second optical signal, filters the second optical signal to obtain a third optical signal, and transmits the third optical signal to a second optical detector;
the second light detector receives and detects a hidden signal contained in the third light signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011596225.XA CN114696918B (en) | 2020-12-29 | 2020-12-29 | Communication device and communication method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011596225.XA CN114696918B (en) | 2020-12-29 | 2020-12-29 | Communication device and communication method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114696918A CN114696918A (en) | 2022-07-01 |
| CN114696918B true CN114696918B (en) | 2023-07-21 |
Family
ID=82131570
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011596225.XA Active CN114696918B (en) | 2020-12-29 | 2020-12-29 | Communication device and communication method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114696918B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115085819B (en) * | 2022-07-26 | 2022-11-15 | 陕西浩兴坤达新能源科技有限公司 | Information transmission method and system for natural electromagnetic pulse vector signal energy spectrum |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1988432A (en) * | 2006-12-27 | 2007-06-27 | 中国科学院上海光学精密机械研究所 | Full-digital space optical communication array signal diversity receiving system |
| CN103955028A (en) * | 2014-04-29 | 2014-07-30 | 中国科学院半导体研究所 | Broadband tunable single-passband microwave photon filter generating system |
| WO2020056756A1 (en) * | 2018-09-21 | 2020-03-26 | 南京牧镭激光科技有限公司 | Pulse coherent doppler anemometry laser radar and anemometry method |
-
2020
- 2020-12-29 CN CN202011596225.XA patent/CN114696918B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1988432A (en) * | 2006-12-27 | 2007-06-27 | 中国科学院上海光学精密机械研究所 | Full-digital space optical communication array signal diversity receiving system |
| CN103955028A (en) * | 2014-04-29 | 2014-07-30 | 中国科学院半导体研究所 | Broadband tunable single-passband microwave photon filter generating system |
| WO2020056756A1 (en) * | 2018-09-21 | 2020-03-26 | 南京牧镭激光科技有限公司 | Pulse coherent doppler anemometry laser radar and anemometry method |
Non-Patent Citations (1)
| Title |
|---|
| 时域相位光码分多址隐藏通信性能分析;孟楠等;光通信技术;36(02);51-53 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114696918A (en) | 2022-07-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH0787428B2 (en) | Digital information transmission method and apparatus | |
| JP2701608B2 (en) | Optical clock extraction circuit | |
| Gleĭm et al. | Sideband quantum communication at 1 Mbit/s on a metropolitan area network | |
| US10153617B2 (en) | Laser, laser modulation method and laser combination system | |
| US9967031B1 (en) | Electro-optic communications system with stimulated brillouin scattering (SBS) bandpass filter | |
| CN113179149B (en) | Secret optical communication system based on double-chaos phase encoding encryption | |
| Zhao et al. | Generation of synchronized wideband complex signals and its application in secure optical communication | |
| CN114696918B (en) | Communication device and communication method thereof | |
| CN113411136B (en) | Quadrature modulation secret optical communication device and method | |
| CN111147145A (en) | Large-key space chaotic optical communication transceiver | |
| CN103178951B (en) | Based on the chaos signal generator of tunable micro-ring resonator | |
| US20070104492A1 (en) | System for and method of single slideband modulation for analog optical link | |
| CN116192284B (en) | Device and method for traceless encryption in physical layer of optical communication system | |
| Li et al. | Photonic generation of microwave binary digital modulation signal with format agility and parameter tunability | |
| Liu et al. | Subnoise optical covert communication based on amplified spontaneous emission light | |
| CN114337731B (en) | Optical frequency hopping communication system and method | |
| CN112098951A (en) | Baseband noise-free double-frequency phase coding pulse optical generation method capable of inhibiting power periodic fading | |
| KR102211485B1 (en) | Receiver and method for coherent optical communication | |
| US7133621B1 (en) | Optical communication with phase encoding and phase shifting | |
| WO2003098297A1 (en) | Multiphase optical pulse generator | |
| CN107408793B (en) | device, equipment and method for generating same-frequency local oscillator light source | |
| KR101367407B1 (en) | Single side band optical transmitter | |
| JP2007096911A (en) | Data transmitting method, system, optical transmitter and optical receiver | |
| Wang et al. | Real-time stealth optical transmission via fast laser frequency dithering | |
| TWI569591B (en) | Radio-over-fiber transport systems with phase modulation to intensity modulation converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |