CN112436806A - Millimeter wave noise signal generating device and generating method - Google Patents
Millimeter wave noise signal generating device and generating method Download PDFInfo
- Publication number
- CN112436806A CN112436806A CN202011080094.XA CN202011080094A CN112436806A CN 112436806 A CN112436806 A CN 112436806A CN 202011080094 A CN202011080094 A CN 202011080094A CN 112436806 A CN112436806 A CN 112436806A
- Authority
- CN
- China
- Prior art keywords
- chaotic
- optical
- signal
- noise signal
- wave noise
- 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.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B29/00—Generation of noise currents and voltages
Landscapes
- Optical Communication System (AREA)
Abstract
The invention discloses a millimeter wave noise signal generating device and a generating method, wherein the device comprises: the device comprises a chaotic signal generator, a chaotic spectrum stretcher and a balanced heterodyne detector; the chaotic signal generator and the chaotic spectrum stretcher respectively comprise a plurality of chaotic signal generators, and each chaotic signal generator corresponds to one chaotic spectrum stretcher; the output end of the chaotic signal generator is connected with the input end of the chaotic spectrum stretcher; the output ends of the different chaotic spectrum stretchers are respectively connected with different input ends of the balanced heterodyne detector; and the output end of the balanced heterodyne detector outputs a millimeter wave noise signal. The invention overcomes the problems of low noise signal power and small noise signal bandwidth generated based on an optical method.
Description
Technical Field
The invention relates to the field of noise signal generators, in particular to a millimeter wave noise signal generating device and a millimeter wave noise signal generating method.
Background
Because of the appearance of the laser technology, the frequency band of coherent light obtained by the nonlinear optical effect is extremely wide, so that hundreds of thousands of paths of coherent light are transmitted simultaneously by the original microwave cable in the communication technology, millions of paths of telephones or tens of thousands of sets of television programs can be transmitted simultaneously by the existing optical cable for laser communication, and the problems of small capacity and excessively crowded frequency band of radio communication are solved.
The millimeter wave is an electromagnetic wave between microwave and light wave, is used as a high-frequency-band electromagnetic wave, has short single-hop communication distance, is transmitted in the atmosphere in a direct wave mode, and has narrow wave beam and very good directivity. Meanwhile, the millimeter wave has strong anti-interference capability. Therefore, the method is a communication technology with stable and reliable propagation. With the increasing demand of people on high-speed wireless communication systems and the continuous progress of process technologies, the millimeter wave technology is rapidly developed, and the requirement on millimeter wave hardware is higher and higher.
The millimeter wave noise generation method based on the electronics technology mainly comprises the following steps: resistance noise is used as a noise source, a diode and a field effect transistor are used as a signal source, however, millimeter wave noise generated by the method has the problems of small output power, difficult coupling, poor flatness of output noise power and the like, and the noise sources are difficult to meet the actual requirements due to the requirements of practical application.
Chaos is a seemingly irregular motion, i.e., disorganized and ordered in nature. For example, the climate change can generate chaos, and chaos phenomena exists in mathematics, biology, economy, sociology and the like. Because the chaotic signal has the unique characteristic of aperiodic continuous broadband spectrum, the broadband chaotic laser source is used as a signal source for generating millimeter wave noise, and the broadband of the millimeter wave noise can be effectively improved.
Disclosure of Invention
The invention provides a millimeter wave noise signal generating device and a millimeter wave noise signal generating method for overcoming the defects of low noise signal power and narrow noise signal bandwidth generated by a noise generator based on mathematics and physical mechanisms in the prior art.
The device comprises: the device comprises a chaotic signal generator, a chaotic spectrum stretcher and a balanced heterodyne detector;
the chaotic signal generator and the chaotic spectrum stretcher respectively comprise a plurality of chaotic signal generators, and each chaotic signal generator corresponds to one chaotic spectrum stretcher;
the output end of the chaotic signal generator is connected with the input end of the chaotic spectrum stretcher; the output ends of the different chaotic spectrum stretchers are respectively connected with different input ends of the balanced heterodyne detector; and the output end of the balanced heterodyne detector outputs a millimeter wave noise signal.
Preferably, the signal transmitter includes: the device comprises a distributed feedback semiconductor laser, a polarization controller, a first optical coupler, an optical attenuator and a feedback device;
the output end of the distributed feedback semiconductor laser is connected with the input end of the polarization controller, and the output end of the polarization controller is connected with the input end of the first optical coupler;
the output end of the optical coupler is respectively connected with the input end of the chaotic spectrum stretcher and the input end of the optical attenuator;
the output end of the optical attenuator is connected with the feedback device.
Preferably, the feedback device is a fiber optic mirror.
Preferably, the chaotic spectral stretcher includes: optical amplifiers, single mode optical fibers;
the input end of the optical amplifier is connected with the output end of the first optical coupler;
the output end of the optical amplifier is connected with one end of the single-mode optical fiber, and the other end of the single-mode optical fiber is connected with the input end of the balanced heterodyne detector.
Preferably, the balanced heterodyne detector includes: the second optical coupler, the first photoelectric detector, the second photoelectric detector and the subtracter are arranged;
the input end of the second optical coupler is respectively connected with the output ends of the first chaotic spectrum stretcher and the second chaotic spectrum stretcher;
two output ends of the second optical coupler are respectively connected with the input end of the first photoelectric detector and the input end of the second photoelectric detector;
the output end of the first photoelectric detector and the output end of the second photoelectric detector are respectively connected with two input ends of the subtracter; the output end of the subtracter outputs the millimeter wave noise signal.
Preferably, the number of the chaotic signal generators is 2, and the number of the chaotic spectrum stretchers is 2.
Preferably, the center wavelengths of the laser signals emitted by the distributed feedback semiconductor lasers in different chaotic signal generators are different.
Preferably, the chaotic signal generators of different chaotic signals are distributed feedback semiconductor lasers, and the spectral widths of the chaotic laser signals generated at the same time are different.
The wavelength interval of the two broadband chaotic laser signals determines the frequency of the millimeter wave noise signal, and the spectral width of the two broadband chaotic laser signals determines the bandwidth of the generated millimeter wave noise signal.
The millimeter wave noise signal generation method comprises the following steps: the output signal of the chaotic signal generator is input to the chaotic spectrum stretcher, the chaotic laser signal of the chaotic spectrum stretcher outputting the broadband and the chaotic laser signal of the chaotic spectrum stretcher outputting the broadband are sent to the optical coupler, the chaotic laser signal after the spectral stretching is input to a balance detector composed of a first photoelectric detector, a second photoelectric detector and a subtracter for optical heterodyne detection, and finally millimeter wave electric noise with controllable bandwidth and frequency band is output.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
the invention provides an optical feedback method to generate a chaotic laser source, a chaotic stretcher is formed by an optical amplifier and a single mode fiber, the optical amplifier is used for amplifying optical power, and simultaneously, nonlinear effects (self-phase modulation and group velocity dispersion) of the single mode fiber are combined to output a noise signal with broadened spectral line width, broadened power spectrum and flatter noise spectrum. Two chaotic laser signals with different wavelengths are subjected to balanced heterodyne detection to generate broadband high-frequency millimeter wave noise signals, and the problems of low noise signal power and small noise signal bandwidth generated by a noise generator based on an optical method in the prior art are effectively solved.
Drawings
Fig. 1 is a schematic diagram of a millimeter wave noise signal generation apparatus according to embodiment 1.
In the figure: 1-a first chaotic signal generator, 2-a second chaotic signal generator, 3-a first chaotic spectrum stretcher, 4-a second chaotic spectrum stretcher, 5-a second optical coupler, 6-a first photoelectric detector, 7-a second photoelectric detector, 8-a subtracter, 101-a distributed feedback semiconductor laser, 102-a polarization controller, 103-a first optical coupler, 104-an optical attenuator, 105-a feedback device, 201-a distributed feedback semiconductor laser, 202-a polarization controller, 203-a first optical coupler, 204-an optical attenuator, 205-a feedback device, 301-an optical amplifier, 302-a single mode fiber, 401-an optical amplifier, 402-a single mode fiber.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent;
for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product;
it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
Example 1:
the present embodiment provides a millimeter wave noise signal generation apparatus, as shown in fig. 1, the apparatus including: the device comprises a first chaotic signal generator 1, a second chaotic signal generator 2, a first chaotic spectrum stretcher 3, a second chaotic spectrum stretcher 4 and a balanced heterodyne detector.
The balanced heterodyne detector includes: a second optical coupler 5, a first photoelectric detector 6, a second photoelectric detector 7 and a subtracter 8.
The output end of the first chaotic signal generator 1 is connected with the input end of the first chaotic spectrum stretcher 3, the output end of the second chaotic signal generator 2 is connected with the input end of the second chaotic spectrum stretcher 4, and the output end of the first chaotic spectrum stretcher 3 and the output end of the second chaotic spectrum stretcher 4 are respectively connected with different input ends of the balanced heterodyne detector; and the output end of the balanced heterodyne detector outputs a millimeter wave noise signal.
More specifically, the first chaotic signal generator 1 includes: the distributed feedback semiconductor laser 101, the polarization controller 102, the first optical coupler 103, the optical attenuator 104 and the feedback device 105 have the following specific connection relations: the output end of the distributed semiconductor laser 101 is connected to the input end of a polarization controller 102, the output end of the polarization controller 102 is connected to the input end of a first optical coupler 103, the output end of the optical coupler 103 is respectively connected to the input end of an optical attenuator 104 and the input end of a spectrum stretcher 3, and the output end of the optical attenuator 104 is connected to a feedback device 105. Wherein, the external cavity feedback composed of the distributed semiconductor laser 101 and the feedback device 105 is used for generating the chaotic laser signal. The generated chaotic laser signal is input to the chaotic spectrum stretcher 3.
The second chaotic signal generator 2 includes: the distributed feedback semiconductor laser 201, the polarization controller 202, the first optical coupler 203, the optical attenuator 204 and the feedback device 205 have the following specific connection relations: the output end of the distributed semiconductor laser 201 is connected to the input end of the polarization controller 202, the output end of the polarization controller 202 is connected to the input end of the optical coupler 203, the output end of the optical coupler 203 is respectively connected to the input end of the optical attenuator 204 and the input end of the spectral stretcher 4, and the output end of the optical attenuator 204 is connected to the feedback device 205. Wherein, the external cavity feedback composed of the distributed semiconductor laser 201 and the feedback device 205 is used for generating the chaotic laser signal. The generated chaotic laser signal is input to the chaotic spectrum stretcher 4.
The feedback devices 105, 205 for generating the optical feedback chaotic laser signal in this embodiment are fiber mirrors.
Note that the center wavelengths of the distributed feedback semiconductor laser 101 and the distributed feedback semiconductor laser 201 are different. The wavelength interval of the two broadband chaotic laser signals determines the frequency of the millimeter wave noise signal, and the spectral width of the two broadband chaotic laser signals determines the bandwidth of the generated millimeter wave noise signal.
In this embodiment, the first chaotic spectrum stretcher 3 includes: the optical amplifier 301 and the single mode fiber 302 are connected in such a way that the output end of the chaotic signal generator 1 is connected to the input end of the optical amplifier 301, the output end of the optical amplifier 301 is connected to one end of the single mode fiber 302, and the other end of the single mode fiber 302 is connected to one input end of the optical coupler 5.
The chaotic spectral stretcher 4 includes: the optical amplifier 401 and the single mode fiber 402 are connected in a specific relationship that the output end of the chaotic signal generator 2 is connected to the input end of the optical amplifier 401, the output end of the optical amplifier 401 is connected to one end of the single mode fiber 402, and the other end of the single mode fiber 402 is connected to the other input end of the optical coupler 5.
It should be noted that, after the chaotic laser signal generated by the first chaotic signal generator 1 is input into the first chaotic spectrum stretcher 3, the chaotic laser signal is power amplified by the optical amplifier 301, and then the chaotic laser signal enters the single-mode fiber 302 of several tens of kilometers for transmission. The input chaotic laser signal subjected to optical power amplification undergoes the combined action of group velocity dispersion and self-phase modulation fiber nonlinear effect on the single-mode fiber 302, so that the spectrum of the input chaotic laser signal is greatly expanded in a frequency domain and is represented as a chaotic random signal without a time delay characteristic in a time domain.
In this embodiment, the second optical coupler 5, the first photodetector 6, the second photodetector 7, and the subtractor 8 together form a balanced heterodyne detector,
the input end of the second optical coupler is respectively connected with the single-mode optical fibers 302 and 402;
two output ends of the second optical coupler 5 are respectively connected with an input end of the first photoelectric detector 6 and an input end of the second photoelectric detector 7;
the output end of the first photoelectric detector 6 and the output end of the second photoelectric detector 6 are respectively connected with two input ends of a subtracter 8; the output terminal of the subtractor 8 outputs a millimeter wave noise signal.
The broadband chaotic random signal output by one output end of the second optical coupler 5 is sent to the photoelectric detector 6 for photoelectric conversion, the broadband chaotic random signal output by the other output end of the optical coupler 5 is input to the second photoelectric detector 7 for photoelectric conversion, and after the photoelectric conversion, the electric signal output by the first photoelectric detector 6 and the electric signal output by the second photoelectric detector 7 are jointly input to the subtracter 8 to output a broadband millimeter wave noise signal.
Example 2:
this embodiment provides a millimeter wave noise signal generation method, which is applied to the millimeter wave noise signal generation apparatus described in embodiment 1, and the method includes the following steps:
the external cavity feedback composed of the distributed semiconductor laser 101 and the feedback device 103 is used for generating chaotic laser signals. The chaotic optical signal output by the chaotic signal generator is input to the chaotic spectrum stretcher 3, the chaotic laser signal passes through the optical amplifier 301, the optical power is greatly improved, then the chaotic laser signal with the improved optical power enters a single-mode optical fiber 302 of dozens of kilometers for transmission, and due to the combined action of group velocity dispersion and the nonlinear effect of the self-phase modulation optical fiber, the spectrum of the input chaotic laser signal is stretched in a frequency domain and is represented as a chaotic random signal without a time delay characteristic in a time domain.
The external cavity feedback composed of the distributed semiconductor laser 201 and the feedback device 203 is used for generating chaotic laser signals. The chaotic optical signal output by the chaotic signal generator is input to the chaotic spectrum stretcher 4, the chaotic laser signal passes through the optical amplifier 401, the optical power is greatly improved, then the chaotic laser signal with the improved optical power enters a single-mode optical fiber 402 of dozens of kilometers for transmission, and due to the combined action of group velocity dispersion and the nonlinear effect of the self-phase modulation optical fiber, the spectrum of the input chaotic laser signal is stretched in a frequency domain and is represented as a chaotic random signal without a time delay characteristic in a time domain.
The chaotic laser signal of the broadband output by the chaotic spectrum stretcher 3 and the chaotic laser signal of the broadband output by the chaotic spectrum stretcher 4 are sent to the optical coupler 5, the chaotic laser signal after spectrum stretching is input into a balance detector consisting of a first photoelectric detector, a second photoelectric detector and a subtracter for optical heterodyne detection, and finally millimeter wave electric noise with controllable bandwidth and frequency band is output.
The terms describing positional relationships in the drawings are for illustrative purposes only and are not to be construed as limiting the patent;
it should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A millimeter-wave noise signal generating apparatus, comprising: the device comprises a chaotic signal generator, a chaotic spectrum stretcher and a balanced heterodyne detector;
the chaotic signal generator and the chaotic spectrum stretcher respectively comprise a plurality of chaotic signal generators, and each chaotic signal generator corresponds to one chaotic spectrum stretcher;
the output end of the chaotic signal generator is connected with the input end of the chaotic spectrum stretcher; the output ends of the different chaotic spectrum stretchers are respectively connected with different input ends of the balanced heterodyne detector; and the output end of the balanced heterodyne detector outputs a millimeter wave noise signal.
2. The millimeter-wave noise signal generation device according to claim 1, wherein the signal transmitter includes: the device comprises a distributed feedback semiconductor laser, a polarization controller, a first optical coupler, an optical attenuator and a feedback device;
the output end of the distributed feedback semiconductor laser is connected with the input end of the polarization controller, and the output end of the polarization controller is connected with the input end of the first optical coupler;
the output end of the optical coupler is respectively connected with the input end of the chaotic spectrum stretcher and the input end of the optical attenuator;
the output end of the optical attenuator is connected with the feedback device.
3. The millimeter-wave noise signal generating apparatus according to claim 2, wherein the feedback device is a fiber mirror.
4. The millimeter wave noise signal generation device according to claim 2 or 3, wherein the chaotic spectrum stretcher includes: optical amplifiers, single mode optical fibers;
the input end of the optical amplifier is connected with the output end of the first optical coupler;
the output end of the optical amplifier is connected with one end of the single-mode optical fiber, and the other end of the single-mode optical fiber is connected with the input end of the balanced heterodyne detector.
5. The millimeter-wave noise signal generating apparatus according to claim 4, wherein the balanced heterodyne detector comprises: the second optical coupler, the first photoelectric detector, the second photoelectric detector and the subtracter are arranged;
the input end of the second optical coupler is respectively connected with the output ends of the first chaotic spectrum stretcher and the second chaotic spectrum stretcher;
two output ends of the second optical coupler are respectively connected with the input end of the first photoelectric detector and the input end of the second photoelectric detector;
the output end of the first photoelectric detector and the output end of the second photoelectric detector are respectively connected with two input ends of the subtracter; the output end of the subtracter outputs the millimeter wave noise signal.
6. The millimeter wave noise signal generation device according to claim 5, wherein the number of the chaotic signal generators is 2.
7. The millimeter wave noise signal generation device of claim 6, wherein the number of chaotic spectrum stretchers is 2.
8. The millimeter-wave noise signal generating device according to claim 7, wherein the center wavelengths of the laser signals emitted from the distributed feedback semiconductor lasers in different chaotic signal generators are different.
9. The millimeter wave noise signal generating device according to claim 8, wherein the chaotic signal generators of different chaotic signals have distributed feedback semiconductor lasers, and the chaotic laser signals generated at the same time have different spectral widths.
10. A millimeter wave noise signal generation method, comprising: the method comprises the following steps: the output signal of the chaotic signal generator is input to the chaotic spectrum stretcher, the chaotic laser signal of the chaotic spectrum stretcher outputting the broadband and the chaotic laser signal of the chaotic spectrum stretcher outputting the broadband are sent to the optical coupler, the chaotic laser signal after the spectral stretching is input to a balance detector composed of a first photoelectric detector, a second photoelectric detector and a subtracter for optical heterodyne detection, and finally millimeter wave electric noise with controllable bandwidth and frequency band is output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011080094.XA CN112436806A (en) | 2020-10-10 | 2020-10-10 | Millimeter wave noise signal generating device and generating method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011080094.XA CN112436806A (en) | 2020-10-10 | 2020-10-10 | Millimeter wave noise signal generating device and generating method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112436806A true CN112436806A (en) | 2021-03-02 |
Family
ID=74690404
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011080094.XA Pending CN112436806A (en) | 2020-10-10 | 2020-10-10 | Millimeter wave noise signal generating device and generating method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112436806A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2822684C1 (en) * | 2023-12-29 | 2024-07-11 | Российская Федерации, от имени которой выступает Государственная корпорация по атомной энергии "Росатом" (Госкорпорация "Росатом") | Device for generation of narrow-band electromagnetic radiation of superhigh frequencies |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100034541A1 (en) * | 2008-08-05 | 2010-02-11 | Lucent Technologies Inc. | Pmdc feedback signal for alternate polarization dpsk system |
| US20110309269A1 (en) * | 2010-06-17 | 2011-12-22 | National Taiwan University | Photonic Generator of Ultra-Wide Band Millimeter Wave |
| CN103368653A (en) * | 2013-07-22 | 2013-10-23 | 太原理工大学 | Method and device for generating broadband chaotic signal similar to white noise |
| CN108712212A (en) * | 2018-05-09 | 2018-10-26 | 太原理工大学 | A kind of chaotic signal producing method and device based on uncertainty quantum noise |
| CN110971193A (en) * | 2019-12-05 | 2020-04-07 | 广东工业大学 | Millimeter wave noise signal generator based on FP chaotic laser |
| CN111064526A (en) * | 2019-12-09 | 2020-04-24 | 广东工业大学 | Broadband photon millimeter wave noise signal generation device and method |
| CN111416577A (en) * | 2020-03-04 | 2020-07-14 | 广东工业大学 | Millimeter wave noise signal generating device and method based on optical fiber nonlinear effect |
-
2020
- 2020-10-10 CN CN202011080094.XA patent/CN112436806A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100034541A1 (en) * | 2008-08-05 | 2010-02-11 | Lucent Technologies Inc. | Pmdc feedback signal for alternate polarization dpsk system |
| US20110309269A1 (en) * | 2010-06-17 | 2011-12-22 | National Taiwan University | Photonic Generator of Ultra-Wide Band Millimeter Wave |
| CN103368653A (en) * | 2013-07-22 | 2013-10-23 | 太原理工大学 | Method and device for generating broadband chaotic signal similar to white noise |
| CN108712212A (en) * | 2018-05-09 | 2018-10-26 | 太原理工大学 | A kind of chaotic signal producing method and device based on uncertainty quantum noise |
| CN110971193A (en) * | 2019-12-05 | 2020-04-07 | 广东工业大学 | Millimeter wave noise signal generator based on FP chaotic laser |
| CN111064526A (en) * | 2019-12-09 | 2020-04-24 | 广东工业大学 | Broadband photon millimeter wave noise signal generation device and method |
| CN111416577A (en) * | 2020-03-04 | 2020-07-14 | 广东工业大学 | Millimeter wave noise signal generating device and method based on optical fiber nonlinear effect |
Non-Patent Citations (1)
| Title |
|---|
| 王安帮: "宽带混沌产生与混沌光时域反射测量", 《中国博士学位论文全文数据库 基础科学辑》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2822684C1 (en) * | 2023-12-29 | 2024-07-11 | Российская Федерации, от имени которой выступает Государственная корпорация по атомной энергии "Росатом" (Госкорпорация "Росатом") | Device for generation of narrow-band electromagnetic radiation of superhigh frequencies |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Jia et al. | A full-duplex radio-over-fiber system based on optical carrier suppression and reuse | |
| US20140355998A1 (en) | Method and device for synchronizing entanglement sources for a quantum communication network | |
| CN104067540B (en) | Communication device with frequency discriminator and wavelength division multiplexing for generating intermediate frequency signal and related method | |
| Ahmad et al. | Carriers generated by mode-locked laser to increase serviceable channels in radio over free space optical systems | |
| Tatsumi et al. | 1.3 μm, 56-Gbit/s EML Module target to 400GbE | |
| Tran et al. | Improvements on the performance of subcarrier multiplexing/wavelength division multiplexing based radio over fiber system | |
| Le Guennec et al. | Low-cost transparent radio-over-fiber system for in-building distribution of UWB signals | |
| CN112436806A (en) | Millimeter wave noise signal generating device and generating method | |
| US20130064546A1 (en) | Photonic communications device with an fm/pm discriminator and related methods | |
| CN106506087B (en) | A kind of light-carried wireless broadband system | |
| Darusalam et al. | Hybrid optical communications for supporting the Palapa Ring network | |
| CN111416577B (en) | A device and method for generating millimeter-wave noise signals based on optical fiber nonlinear effects | |
| Karthika et al. | Performance enhancement of hybrid SCM/WDM system using ANN-trained Raman amplifier | |
| CN117270108B (en) | A multi-channel broadband random signal generator based on microring resonator | |
| CN213072669U (en) | Remote high-frequency microwave oscillation source system based on dispersion gradually-decreasing optical fiber | |
| Kavitha et al. | Mixed fiber optical parametric amplifiers for broadband optical communication systems with reduced nonlinear effects | |
| JPH04304432A (en) | Optical soliton transmission method | |
| JP2024119565A (en) | Optical repeater and optical repeater method | |
| Pan et al. | Recent advances in millimeter-wave photonic wireless links for very high data rate communication | |
| Cao et al. | Demonstration of automatically phase-locked self-homodyne detection with a low-power pilot tone based on Brillouin amplification and optical frequency combs | |
| Bian et al. | High-Rate Local-Local-Oscillator Continuous-Variable Quantum Key Distribution Using Chip-Based Silicon Photonic Receiver | |
| Cho et al. | Demonstrations of THz-band indoor network based on photonics technology | |
| Anderson et al. | Comparative study of EDFA and SOA in WDM optical network placed at different position | |
| Sangeeta | Performance Enhancement in Wireless Network by Considering Attenuation Factors | |
| CN207867189U (en) | One kind being based on the full light Raman multi-wavelength converter of asymmetric double core photonic crystal fiber |
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 | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210302 |
|
| RJ01 | Rejection of invention patent application after publication |