CN112217566B - Remote high-frequency microwave oscillation source system based on single-stage nonlinear spectrum expansion - Google Patents
Remote high-frequency microwave oscillation source system based on single-stage nonlinear spectrum expansion Download PDFInfo
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- CN112217566B CN112217566B CN202011141620.9A CN202011141620A CN112217566B CN 112217566 B CN112217566 B CN 112217566B CN 202011141620 A CN202011141620 A CN 202011141620A CN 112217566 B CN112217566 B CN 112217566B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
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Abstract
The invention provides a remote high-frequency microwave oscillation source system based on single-stage nonlinear spectrum expansion; the same DFB laser light source is adopted to generate high-speed optical millimeter wave and a remote high-frequency microwave oscillation source, so that phase noise can be effectively restrained; the adopted DFB laser has the characteristics of narrow linewidth and high side mode rejection ratio, and can effectively reject intensity noise; the remote high-frequency microwave oscillation source provided by the invention has novel, simple and feasible generation scheme and can effectively inhibit noise. The method and the system can be used as important references for exploring and researching a high-bit-rate optical millimeter wave system, and can provide important support for deep research in the fields of microwave photonics, nonlinear optics, optical fiber communication, optical information processing, new generation information technology and the like.
Description
Technical Field
The invention relates to a remote high-frequency microwave oscillation source system based on single-stage nonlinear spectrum expansion, which can be applied to the fields of microwave photonics, nonlinear optics, optical fiber communication, optical information processing, new generation information technology and the like.
Background
In recent years, various services such as large data, broadband streaming media, 4G/5G traffic and the like are increasing, and the demand for high-speed and large-capacity wireless communication is increasing. In order to realize wireless broadband communication, an optical millimeter wave communication technology Radio-over-Fiber (RoF) that combines an optical Fiber communication technology and a high-frequency wireless access should be generated. Currently, optical Millimeter Wave generation, transmission and reception technology has become one of the emerging communication technologies developed as a research hotspot for realizing ultra-wideband access [ Zengyan Wu, changqing Cao, xiaoding Zeng, zhejun Feng, jingshi Shen, xu Yan, bo Wang, and Xiyuan Su, "Filter radio-Over-Fiber system based on polarization multiplexing to generate an 80 GHz Millimeter Wave," appl. Opt. 59, 7455-7461 (2020); yun Han, shuangjin Shi, rongang Jin, yunxiang Wang, and Qi Qiau, "Integrated waveguide true time delay beamforming system based on an SOI platform for GHz mil-Wave communication," appl. Opt 59, 7770-7778 (2020); C.Tsai, C.Li, C.Chen, C.Cheng, S. Chi, and G.Lin. 9660-GHz Wave-optical-92-35, and "Lin 60-Milter-V-optical-35-92, lin. 35-35, lin. 35.
The generation, transmission and reception technologies of optical millimeter waves are important technologies for realizing high-performance communication. However, the optical millimeter wave system has strict requirements on device performance parameters, optical fiber parameters and the like; an expensive electric high-frequency local oscillation source (such as 40GHz, 60 GHz and the like) is usually introduced into an optical millimeter wave uplink subsystem, and the system is greatly improved if effective measures can be taken to replace the electric high-frequency local oscillation source. The Chinese operators are wide and numerous in population, the information communication demand is rapidly increased, and the communication demand of high-speed optical millimeter waves is becoming urgent. In general, two different lasers may be employed
The optical device generates light waves with different wavelengths to perform beat frequency to generate an electric high-frequency local oscillation source, however, the situation has larger phase noise; therefore, the method is a key point of optical millimeter wave research, and the method creatively solves the replacement problem of the electric high-frequency local vibration source and realizes high speed.
Disclosure of Invention
(one) solving the technical problems
Under the conditions that the requirements of optical millimeter wave high-speed are increasingly urgent and under the support of special construction engineering of national natural science foundation (numbers 61671227 and 61431009), shandong province natural science foundation (ZR 2011FM 015) and Taishan scholars, a 43.2 GHz and 10.8 Gbit/s high-speed optical millimeter wave system is taken as an example for aiming at the problems in the optical millimeter wave research, the invention provides a remote high-frequency microwave oscillation source system based on single-stage nonlinear spectrum expansion, which replaces an electric high-frequency local oscillation source in a high-speed optical millimeter wave uplink system and provides important support for deep research in the fields of microwave photonics, nonlinear optics, optical fiber communication, optical information processing, new generation information technology and the like.
(II) technical scheme
Taking a 43.2 GHz and 10.8 Gbit/s high-speed optical millimeter wave system as an example, the invention provides a remote high-frequency microwave oscillation source system based on single-stage nonlinear spectrum expansion, and laser generated by a narrow linewidth DFB laser passes through 60: after the 40 branching units branch, 60% of laser enters a high-speed optical millimeter wave generating and transmitting system; 40% of laser enters a novel remote high-frequency microwave oscillation source system through a polarization controller; the remote high-frequency microwave oscillation source system and the optical millimeter wave system share the same narrow linewidth DFB laser; the Agilent 43.2 Gbit/s error code meter 81250 outputs 10.8 Gbit/s high-rate data signals to generate high-rate optical millimeter waves, and simultaneously generates a 10.8 GHz electric clock required by a remote high-frequency microwave oscillation source; 10.8 The GHz electric clock is amplified by the SHF806E first electric amplifier and then enters a high-speed broadband modulator to modulate the laser output by the polarization controller, so as to form a modulation spectrum with 10.8 GHz interval; 10.8 The modulation spectrum with GHz interval is spread by a nonlinear spectrum spreading module, and then enters an optical filtering module to filter redundant spectrum, so as to form a high-frequency microwave oscillation source spectrum with 43.2 GHz interval; the frequency interval of the spectrum of the high-frequency microwave oscillation source can be adjusted and selected according to actual conditions; the spectrum expansion module consists of an erbium-doped fiber amplifier KPS-EDFA and a short-distance dispersion flat fiber; the spectrum of the high-frequency microwave oscillation source generally has a wider spectrum, and can be transmitted through a dispersion flat optical fiber with 76.2km low dispersion to obtain a remote high-frequency microwave oscillation source spectrum; the spectrum of the remote high-frequency microwave oscillation source is properly amplified by an EDFA and enters a high-frequency photoelectric detector to obtain a beat frequency electric signal; the beat frequency electric signal is amplified by a SHF803P second electric amplifier to obtain an electric remote high-frequency microwave oscillation source required by the system; the performance of the electric remote high-frequency microwave oscillation source can be measured and analyzed by an electric spectrometer E4440A through a mixer 11970U; the spectral performance of the system optical path link can be measured using a spectral analyzer AQ 6319.
The invention has the following beneficial effects:
taking a 43.2 GHz and 10.8 Gbit/s high-speed optical millimeter wave system as an example, the invention provides a remote high-frequency microwave oscillation source system based on single-stage nonlinear spectrum expansion; the same DFB laser light source is adopted to generate high-speed optical millimeter wave and a remote high-frequency microwave oscillation source, so that phase noise can be effectively restrained; the adopted DFB laser has the characteristics of narrow linewidth and high side mode rejection ratio, and can effectively reject intensity noise; the remote high-frequency microwave oscillation source provided by the invention has novel, simple and feasible generation scheme and can effectively inhibit noise. The method and the system can be used as important references for exploring and researching a high-bit-rate optical millimeter wave system, and can provide important support for deep research in the fields of microwave photonics, nonlinear optics, optical fiber communication, optical information processing, new generation information technology and the like.
Drawings
FIG. 1 is a block diagram of a remote high frequency microwave oscillation source system based on single stage nonlinear spectral expansion;
fig. 2 is a spread spectrum output from the spectrum spreading module (8).
Detailed Description
The invention is further described below with reference to the drawings and the implementations.
Fig. 1 is a block diagram of a remote high frequency microwave oscillation source system based on single stage nonlinear spectral expansion. As shown in fig. 1, the present invention proposes a remote high-frequency microwave oscillation source system based on single-stage nonlinear spectrum expansion, and laser generated by a narrow-linewidth DFB laser 1 passes through 60: after the 40 splitter 2 splits, 60% of laser enters the high-speed optical millimeter wave generating and transmitting system 3;40% of laser enters a novel remote high-frequency microwave oscillation source system through a polarization controller 4; the remote high-frequency microwave oscillation source system and the optical millimeter wave system share the same narrow linewidth DFB laser 1; the Agilent 43.2 Gbit/s error code meter 81250 outputs 10.8 Gbit/s high-rate data signals to generate high-rate optical millimeter waves, and simultaneously generates a 10.8 GHz electric clock 5 required by a remote high-frequency microwave oscillation source; 10.8 The GHz electric clock 5 enters a high-speed broadband modulator 7 to modulate the laser output by the polarization controller 4 after being amplified by the SHF806E first electric amplifier 6, so as to form a modulation spectrum with 10.8 GHz interval; 10.8 The modulation spectrum with GHz interval enters an optical filtering module 9 to filter redundant spectrum after spectrum expansion by a nonlinear spectrum expansion module 8, so as to form a high-frequency microwave oscillation source spectrum with 43.2 GHz interval; the frequency interval of the spectrum of the high-frequency microwave oscillation source can be adjusted and selected according to actual conditions; the spectrum expansion module 8 consists of an erbium-doped fiber amplifier KPS-EDFA and a short-distance dispersion flat fiber; the spectrum of the high-frequency microwave oscillation source generally has a wider spectrum, and can be transmitted through a 76.2km low-dispersion flat optical fiber 10 to obtain a remote high-frequency microwave oscillation source spectrum; the spectrum of the remote high-frequency microwave oscillation source is properly amplified by the EDFA11 and enters the high-frequency photoelectric detector 12 to obtain a beat frequency electric signal; the beat frequency electric signal is amplified by a SHF803P second electric amplifier 13 to obtain an electric remote high-frequency microwave oscillation source required by the system; the performance of the electric remote high-frequency microwave oscillation source can be measured and analyzed by an electric spectrometer E4440A through a mixer 11970U; the spectral performance of the system optical path link can be measured using a spectral analyzer AQ 6319.
Fig. 2 is a spread spectrum output from the spectrum spreading module 8. As can be seen, the spectrum is 16 spectral lines spaced 10.8 GHz apart; the spectral center wavelength 1549.874 nm, which is tunable by a DFB laser; the spectral center extinction ratio is maximum and exceeds 35dB; the extinction ratio of the 7 spectral lines at the left side of the spectral center and the 8 spectral lines at the right side of the spectral center can be more than 20dB, and any two of the 7 spectral lines can be used as spectral lines for beating frequency of a remote high-frequency microwave oscillation source. The spectral lines are derived from the same DFB laser with high extinction ratio and narrow linewidth, and derived from the same high-speed broadband modulator, so that phase noise and intensity noise can be effectively suppressed. The larger the extinction ratio of the spectral line is, the better the remote high-frequency microwave oscillation source performance generated by beat frequency is. The patent application takes the reserved spectrum center and the 4 th spectrum line on the right side of the spectrum center of the optical filtering module as an example, and the reserved spectrum center and the 4 th spectrum line on the right side of the spectrum center form a remote high-frequency microwave oscillation source spectrum with an interval of 43.2 GHz; the clock frequency output by the Agilent 43.2 Gbit/s error code meter 81250 can be adjusted to form remote high-frequency microwave oscillation source spectrums with different frequency intervals; if the clock frequency is regulated to be 10 GHz, a remote high-frequency microwave oscillation source spectrum with an interval of 40GHz can be obtained; according to the practical situation, two proper spectral lines can be regulated and selected as the spectral lines of the remote high-frequency microwave oscillation source for beat frequency, so that the remote high-frequency microwave oscillation source with different frequencies is formed to replace the electric high-frequency local oscillation source in the high-speed optical millimeter wave uplink system.
In a word, take 43.2 GHz, 10.8 Gbit/s high-speed optical millimeter wave system as an example, the invention has proposed a long-range high-frequency microwave oscillation source system based on single-stage nonlinear spectrum expansion; the frequency of the remote high-frequency microwave oscillation source system can be adjusted and selected according to actual conditions; the remote high-frequency microwave oscillation source system based on single-stage nonlinear spectrum expansion provides important support for deep research in the fields of microwave photonics, optical fiber communication, wireless optical fiber access, optical fiber optics, optical information processing, new generation information technology and the like.
It should be noted that the detailed description is merely a representative example of the invention, and it is obvious that the technical solution of the invention is not limited to the above-described example, but many variations are possible. Those of ordinary skill in the art, with the benefit of this disclosure and the written description of the invention, should be considered to be within the scope of what is claimed.
Claims (2)
1. A remote high-frequency microwave oscillation source system based on single-stage nonlinear spectrum expansion is characterized in that: laser light generated by the narrow linewidth DFB laser (1) passes through 60: after the 40 branching unit (2) branches, 60% of laser enters a high-speed optical millimeter wave generating and transmitting system (3); 40% of laser enters a novel remote high-frequency microwave oscillation source system through a polarization controller (4); the remote high-frequency microwave oscillation source system and the optical millimeter wave system share the same narrow linewidth DFB laser (1); the Agilent 43.2 Gbit/s error code meter 81250 outputs 10.8 Gbit/s high-speed data signals to generate high-speed optical millimeter waves, and simultaneously generates a 10.8 GHz electric clock (5) required by a remote high-frequency microwave oscillation source; 10.8 The GHz electric clock enters a high-speed broadband modulator (7) to modulate laser output by a polarization controller (4) after being amplified by a first electric amplifier (6) to form a modulation spectrum with 10.8 GHz interval; 10.8 The modulation spectrum with GHz interval enters an optical filtering module (9) to filter redundant spectrum after spectrum expansion by a spectrum expansion module (8) to form a high-frequency microwave oscillation source spectrum with 43.2 GHz interval; the frequency interval of the spectrum of the high-frequency microwave oscillation source can be adjusted and selected according to actual conditions; the spectrum of the high-frequency microwave oscillation source generally has a wider spectrum, and is transmitted through a 76.2km low-dispersion flat optical fiber (10) to obtain a remote high-frequency microwave oscillation source spectrum; the spectrum of the remote high-frequency microwave oscillation source is properly amplified by an EDFA (11) and enters a high-frequency photoelectric detector (12) to obtain a beat frequency electric signal; the beat frequency electric signal is amplified by a second electric amplifier (13) to obtain an electric remote high-frequency microwave oscillation source required by the system; the performance of the electric remote high-frequency microwave oscillation source can be measured and analyzed by an electric spectrometer E4440A through a mixer 11970U; the spectral performance of the system optical path link can be measured using a spectral analyzer AQ 6319.
2. A remote high frequency microwave oscillation source system based on single stage nonlinear spectral expansion as defined in claim 1, wherein: the spectrum expansion module (8) consists of an erbium-doped fiber amplifier KPS-EDFA and a short-distance dispersion flat fiber.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103684610A (en) * | 2013-09-22 | 2014-03-26 | 聊城大学 | Remote high-frequency microwave oscillating source in optical millimeter wave system |
| CN103840885A (en) * | 2014-02-27 | 2014-06-04 | 聊城大学 | High carrier frequency and high speed light millimeter wave generating and long-span transmission system |
| CN105391512A (en) * | 2015-10-30 | 2016-03-09 | 聊城大学 | Multicarrier generation system based on dispersion-flattened fiber single-stage modulation |
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- 2020-10-22 CN CN202011141620.9A patent/CN112217566B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103684610A (en) * | 2013-09-22 | 2014-03-26 | 聊城大学 | Remote high-frequency microwave oscillating source in optical millimeter wave system |
| CN103840885A (en) * | 2014-02-27 | 2014-06-04 | 聊城大学 | High carrier frequency and high speed light millimeter wave generating and long-span transmission system |
| CN105391512A (en) * | 2015-10-30 | 2016-03-09 | 聊城大学 | Multicarrier generation system based on dispersion-flattened fiber single-stage modulation |
Non-Patent Citations (1)
| Title |
|---|
| 无滤波24倍频光载毫米波发生器;薛壮壮;裴丽;解宇恒;郝丹;朱可;;光学学报(第10期);全文 * |
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