CN213072669U - Remote high-frequency microwave oscillation source system based on dispersion gradually-decreasing optical fiber - Google Patents

Abstract

The utility model discloses a long-range high-frequency microwave oscillation source system based on a dispersion-decreasing optical fiber; the same DFB laser light source is used to generate a high-speed optical millimeter wave and a long-range high-frequency microwave oscillation source, which can effectively suppress phase noise; The laser has the characteristics of narrow line width and high side mode suppression ratio, which can effectively suppress the intensity noise; the generation scheme of the remote high-frequency microwave oscillation source proposed by the utility model is novel, simple and feasible, and can effectively suppress the noise. The patented method and system can be used as an important reference for the exploration and research of high-bit-rate optical millimeter-wave systems, and provide important support for in-depth research in the fields of microwave photonics, nonlinear optics, optical fiber communication, optical information processing, and new-generation information technology. .

Description

Remote high-frequency microwave oscillation source system based on dispersion gradually-decreasing optical fiber

Technical Field

The utility model relates to a long-range high frequency microwave oscillation source system based on dispersion subtracts optic fibre gradually can be applied to for fields such as microwave photonics, nonlinear optics, fiber communication, optical information processing and new generation information technology.

Background

In recent years, various services such as big data, broadband streaming media, 4G/5G traffic, etc. have been increasing, and the demand for high-speed and large-capacity wireless communication has been increasing. In order to realize wireless broadband communication, Radio-over-fiber (RoF) technology, which combines optical fiber communication technology and high-frequency wireless access, is used as a Radio-over-fiber (RoF) technology. At present, optical millimeter wave generation, transmission and reception technology as an emerging and developed communication technology has become one of the research hotspots for realizing ultra-wideband access.

The generation, transmission and reception technology of optical millimeter waves is an important technology for realizing high-performance communication. However, the requirements of the optical millimeter wave system on device performance parameters, optical fiber parameters and the like are strict; an expensive electric high-frequency local oscillation source (such as 40GHz, 60 GHz and the like) has to be introduced into an optical millimeter wave uplink subsystem, and if effective measures can be taken to replace the electric high-frequency local oscillation source, the system is a great progress. The breadth of our country is large, the population is large, the information communication demand is rapidly increased, and the communication demand of high-speed optical millimeter waves is increasingly urgent. In general, two different lasers can be used to generate light waves with different wavelengths for beat frequency generation to generate an electrical high-frequency local oscillation source, however, in this case, a large phase noise exists; therefore, the key point of the research of the optical millimeter wave is to innovatively solve the substitution problem of the electrical high-frequency local vibration source and realize the high speed.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

Under the increasing urgent situation of light millimeter wave high-speed demand, to the problem in the above-mentioned light millimeter wave research, take 43.2 GHz, 10.8 Gbit/s high-speed light millimeter wave system as an example, the utility model provides a long-range high frequency microwave oscillation source system based on dispersion subtracts optic fibre gradually to replace the electric high frequency local oscillation source in the high-speed light millimeter wave upward system, provide important support for the deep research in fields such as microwave photonics, nonlinear optics, fiber communication, optical information processing and new generation information technology.

(II) technical scheme

In order to achieve the above purpose, the utility model discloses a following technical scheme realizes: use 43.2 GHz, 10.8 Gbit/s high speed optical millimeter wave system as an example, the utility model provides a long-range high frequency microwave oscillation source system based on dispersion subtracts optic fibre gradually, the laser that narrow linewidth DFB laser instrument produced is through 60: after the 40 branching unit branches, 60% of laser enters a high-speed optical millimeter wave generation and transmission 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; an Agilent 43.2 Gbit/s error code instrument 81250 code type generating part E4868 outputs 10.8 Gbit/s high-speed data signals to generate high-speed optical millimeter waves, and simultaneously generates two mutually associated high-frequency clocks 21.6GHz and 10.8 GHz required by a remote high-frequency microwave oscillation source; the laser after polarization is adjusted by the polarization controller and is input into a first high-speed broadband modulator for modulation; the 21.6GHz clock is amplified by a first SHF803P electric amplifier and then modulated by a first high-speed broadband modulator to modulate the laser with the polarization adjusted by the polarization controller, so that a 21.6GHz modulation spectrum is generated; the spectrum of the modulation spectrum with the interval of 21.6GHz is expanded by a first nonlinear spectrum expanding module; the first nonlinear spectrum spreading module consists of an erbium-doped fiber amplifier KPS-EDFA and a short-distance dispersion flat fiber A; the spread spectrum enters a second high-speed broadband modulator after being adjusted in polarization by a second polarization controller; the 10.8 GHz clock enters a second high-speed broadband modulator to modulate a spread spectrum with an interval of 21.6GHz after being amplified by a second SHF806E electric amplifier, and further a modulation spectrum with an interval of 10.8 GHz is generated; the spectrum of the modulation spectrum with the interval of 10.8 GHz is spread again by a second nonlinear spectrum spreading module to form a secondary spread spectrum with the interval of 10.8 GHz; the second nonlinear spectrum spreading module consists of an EDFA1 and a short-distance dispersion flat fiber B; the secondary spread spectrum enters an optical filtering module to filter redundant spectrum, and a high-frequency microwave oscillation source spectrum with an interval of 43.2 GHz is formed; 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 can be transmitted by a long-distance dispersion decreasing optical fiber with low dispersion of 85km to obtain the spectrum of the remote high-frequency microwave oscillation source; the spectrum of the remote high-frequency microwave oscillation source is properly amplified by EDFA2 and enters a high-frequency broadband photoelectric detector to obtain a beat frequency electric signal; the beat frequency electric signal is amplified by an SHF806E electric amplifier 3 (18) to obtain an electric remote high-frequency microwave oscillation source required by the system; the electric remote high-frequency microwave oscillation source can measure the analysis performance by the spectrograph E4440A through the mixer 11970U; the spectral performance of the optical path link of the system can be measured by using a spectral analyzer AQ 6319.

The utility model has the advantages as follows:

taking a 43.2 GHz, 10.8 Gbit/s high-speed optical millimeter wave system as an example, the utility model provides a remote high-frequency microwave oscillation source system based on dispersion-decreasing optical fiber; the same DFB laser light source is adopted to generate high-speed optical millimeter waves and a remote high-frequency microwave oscillation source, so that phase noise can be effectively suppressed; the adopted DFB laser has the characteristics of narrow line width and high side mode suppression ratio, and can effectively suppress intensity noise; the utility model provides a long-range high frequency microwave oscillation source produces the scheme novel, simple feasible, can effectively suppress the noise. The method and the system can be used as important reference 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 a dispersion decreasing optical fiber.

Fig. 2 is a spread spectrum output by the second nonlinear spectrum spreading module (13).

Detailed Description

The invention will be further described with reference to the accompanying drawings and examples.

Fig. 1 is a block diagram of a remote high-frequency microwave oscillation source system based on a dispersion-decreasing optical fiber, taking a 43.2 GHz, 10.8 Gbit/s high-speed optical millimeter wave system as an example, a laser generated by a narrow-linewidth DFB laser 1 is processed by 60: after the branching of the 40 branching unit 2, 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; an Agilent 43.2 Gbit/s error code instrument 81250 code type generating part E4868 outputs 10.8 Gbit/s high-speed data signals to generate high-speed optical millimeter waves, and simultaneously generates two mutually associated high-frequency clocks 21.6GHz and 10.8 GHz required by a remote high-frequency microwave oscillation source; the laser after polarization is adjusted by the polarization controller 4 and is input into a first high-speed broadband modulator 7 for modulation; the 21.6GHz clock 5 is amplified by a first SHF803P electric amplifier 8, and then modulated by a first high-speed broadband modulator 7 to modulate the laser with the polarization adjusted by the polarization controller, so as to generate a 21.6GHz modulation spectrum; the spectrum of the modulated spectrum with the interval of 21.6GHz is spread by a first nonlinear spectrum spreading module 9; the first nonlinear spectrum spreading module 9 consists of an erbium-doped fiber amplifier KPS-EDFA and a short-distance dispersion flat fiber A; the spread spectrum enters a second high-speed broadband modulator 11 after being adjusted in polarization by a second polarization controller 10; the 10.8 GHz clock 6 is amplified by a second SHF806E electric amplifier 12 and then enters a second high-speed broadband modulator 11 to modulate a spread spectrum with an interval of 21.6GHz, and further a modulation spectrum with an interval of 10.8 GHz is generated; the spectrum of the modulation spectrum with the interval of 10.8 GHz is spread again by a second nonlinear spectrum spreading module 13 to form a secondary spread spectrum with the interval of 10.8 GHz; the second nonlinear spectrum spreading module 13 consists of an EDFA1 and a short-distance dispersion flat fiber B; the secondary light spectrum enters the light filtering module 14 to filter redundant spectrum, and a high-frequency microwave oscillation source spectrum with 43.2 GHz interval is formed; 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 can be transmitted through a long-distance dispersion decreasing optical fiber 15 with low dispersion of 85km to obtain the spectrum of the remote high-frequency microwave oscillation source; the spectrum of the remote high-frequency microwave oscillation source is properly amplified by the EDFA 216 and enters the high-frequency broadband photoelectric detector 17 to obtain a beat frequency electric signal; the beat frequency electric signal is amplified by a third SHF806E electric amplifier 18 to obtain an electric remote high-frequency microwave oscillation source required by the system; the electric remote high-frequency microwave oscillation source can measure the analysis performance by the spectrograph E4440A20 through the mixer 11970U 19; the spectral performance of the optical path link of the system can be measured by using a spectral analyzer AQ 6319.

Fig. 2 is a spread spectrum output by the second nonlinear spectrum spreading module 13. As can be seen, the spectrum is 11 spectral lines spaced at 10.8 GHz; the center wavelength of the spectrum is 1549.873 nm and can be adjusted by a DFB laser; the extinction ratios of the middle 5 spectral lines exceed 30 dB; the flatness of 5 spectral lines in the center of the spectrum is +/-0.5 dBm; the extinction ratio of all 11 spectral lines can be larger than 20dB, and any two spectral lines can be used as the spectral lines of a remote high-frequency microwave oscillation source for beating. The spectral lines are from the same DFB laser with high extinction ratio and narrow line width and from the same high-speed broadband modulator, and phase noise and intensity noise can be effectively suppressed. The larger the extinction ratio of the spectral line is, the better the performance of the remote high-frequency microwave oscillation source generated by beat frequency is. The application of the patent takes the optical filtering module to reserve the 4 th spectral line and the 8 th spectral line from the left as an example for explanation, the 4 th spectral line and the 8 th spectral line from the left are reserved, remote high-frequency microwave oscillation source spectrums with the interval of 43.2 GHz are formed, and the extinction ratios of the spectral lines exceed 30 dB; reserving two different spectral lines, and obtaining different spectrums or frequencies of the remote high-frequency microwave oscillation source; the clock frequency output by the Agilent 43.2 Gbit/s error code instrument 81250 can be adjusted to form remote high-frequency microwave oscillation source spectrums with different frequency intervals; if the clock frequency is adjusted to be 10 GHz, a remote high-frequency microwave oscillation source spectrum with the interval of 40GHz can be obtained; according to actual conditions, two proper spectral lines can be adjusted and selected as spectral lines for beat frequency of the remote high-frequency microwave oscillation source to form the required remote high-frequency microwave oscillation source with different frequencies so as to replace an electric high-frequency local oscillation source in the high-speed optical millimeter wave uplink system.

In a word, taking 43.2 GHz, 10.8 Gbit/s high-speed optical millimeter wave system as an example, the utility model provides a long-range high-frequency microwave oscillation source system based on dispersion gradually-decreasing optical fiber; the frequency of the remote high-frequency microwave oscillation source system can be adjusted and selected according to actual conditions; the utility model provides a long-range high frequency microwave oscillation source system based on dispersion subtracts optic fibre provides important support for the deep study in fields such as microwave photonics, fiber communication, wireless fiber access, fiber optics, optical information processing and new generation information technology. It should be noted that the specific embodiments are only representative examples of the present invention, and it is obvious that the technical solution of the present invention is not limited to the above-mentioned examples, and many variations are possible. Those skilled in the art, having the benefit of this disclosure, and being thus clearly disclosed or suggested by the written description, will be protected by this patent.

Claims (3)

1. A long-range high-frequency microwave oscillation source system based on a dispersion-reducing optical fiber, characterized in that: after the laser light generated by the narrow linewidth DFB laser (1) is split by a 60:40 splitter (2), 60% of the 40% of the laser light enters the high-rate optical millimeter wave generation and transmission system (3); 40% of the laser light enters the new remote high-frequency microwave oscillation source system through the polarization controller (4); the remote high-frequency microwave oscillation source system is shared with the optical millimeter-wave system The same narrow linewidth DFB laser; Agilent 43.2 Gbit/s BER 81250 code generation unit E4868 outputs 10.8 Gbit/s high-rate data signals to generate high-rate optical millimeter waves, and at the same time generates the mutual The associated two high-frequency clocks are 21.6 GHz and 10.8 GHz; the laser after polarization is adjusted by the polarization controller (4), and then input to the first high-speed broadband modulator (7) for modulation; the 21.6 GHz clock (5) is powered by the first SHF803P After being amplified by the amplifier (8), the first high-speed broadband modulator (7) is used to modulate the laser light whose polarization is adjusted by the polarization controller (4), thereby generating a modulation spectrum with an interval of 21.6 GHz; the modulation spectrum with an interval of 21.6 GHz is modulated by the first nonlinear The spectrum spreading module (9) spreads the spectrum; the spread spectrum is then adjusted by the second polarization controller (10) and then enters the second high-speed broadband modulator (11); the 10.8 GHz clock (6) is used by the second SHF806E electric amplifier (12) After amplification, it enters the second high-speed broadband modulator (11) to modulate the broadened spectrum with an interval of 21.6 GHz, thereby generating a modulation spectrum with an interval of 10.8 GHz; the modulated spectrum with an interval of 10.8 GHz is re-expanded by the second nonlinear spectrum spreading module (13), A second-order spread spectrum with an interval of 10.8 GHz is formed; the second-order spread spectrum enters the optical filter module (14) to filter out excess spectrum to form a high-frequency microwave oscillation source spectrum with an interval of 43.2 GHz; the high-frequency microwave oscillation source spectrum generally has a wider spectrum , can be transmitted through 85km low dispersion long-distance dispersion-reducing optical fiber (15) to obtain the spectrum of the remote high-frequency microwave oscillation source; the spectrum of the remote high-frequency microwave oscillation source is appropriately amplified by EDFA2 (16) and enters the high-frequency broadband photodetector (17). ) to obtain a beat-frequency electrical signal; the beat-frequency electrical signal is amplified by the third SHF806E electrical amplifier (18) to obtain an electrical remote high-frequency microwave oscillation source required by the system. 2. A long-range high-frequency microwave oscillation source system based on a dispersion-reducing fiber as claimed in claim 1, characterized in that: the first nonlinear spectrum spreading module (9) is composed of an erbium-doped fiber amplifier KPS-EDFA and a short-distance Dispersion flattened fiber A is composed. 3 . The long-range high-frequency microwave oscillation source system based on the dispersion-decreasing fiber according to claim 1 , wherein the second nonlinear spectrum spreading module ( 13 ) is composed of EDFA1 and short-distance dispersion-flattened fiber B. 4 .

Images