CN101217318B - A frequency multiplication millimeter wave generation and simplification device based on optics four-wave mixing effect - Google Patents
A frequency multiplication millimeter wave generation and simplification device based on optics four-wave mixing effect Download PDFInfo
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- CN101217318B CN101217318B CN2008100304529A CN200810030452A CN101217318B CN 101217318 B CN101217318 B CN 101217318B CN 2008100304529 A CN2008100304529 A CN 2008100304529A CN 200810030452 A CN200810030452 A CN 200810030452A CN 101217318 B CN101217318 B CN 101217318B
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Abstract
The invention discloses a simplified device for generating frequency-doubling millimeter wave which belongs to the field of millimeter wave generation in the radio-over-fiber (ROF) communication techniques and is based on the four-wave mixing effect in the optics. The invention uses the modulation inhibited by photo-carrier wave, the four-wave mixing (FWM) effect and the optical filter theory as well as a Mach-Zehnder modulator, and mixes a local oscillation (LO) signal and a baseband digital signal to be used for inhibited modulation of the optical signal carrier, and after the modulation signal is power amplified, the invention forms a new mixing sideband respectively at both sides of two first sidebands through a four-wave mixing (FWM) unit. The invention adopts an adjustable harmonic filter for filtering the original two first sidebands, and implements the beat frequency of the two new mixing sidebands at a photoelectric detection end, thus forming a millimeter wave signal with six octaves. The scheme can lower the frequency of the local oscillation signal source that is used and reduce the bandwidth requirements of the mixer and the optical modulator; therefore, the proposal of the invention saves system cost on the basis of increasing signal bandwidth and improving frequency spectrum utilization ratio.
Description
(1) technical field
The invention belongs to millimeter wave generation field in optical fiber-wireless (Radio-over-Fiber is abbreviated as ROF) communication system technology.
(2) background technology
Following wireless access system will extend to millimere-wave band undoubtedly, because millimeter-wave signal transmission range in air is short, and millimeter wave electronic device is comparatively expensive, and present wireless access way can not adapt to the requirement of millimetre-wave attenuator.Optical fiber-wireless communication system (Radio-Over-Fiber System abbreviates the ROF system as) will become the most promising technology of broadband wireless access that solves.The ROF system uploads to millimeter wave and data-signal on the light carrier in central station simultaneously, and transfers to the base station, only need carry out opto-electronic conversion and amplification in the base station, thereby the structurally variable of base station gets simply.The ROF system can satisfy the requirement of optical millimeter wave communication with minimum price.
The generation of optical millimeter wave is to reduce cost and improve one of key technology of ROF systematic function.Up to now, the method for the generation of the optical millimeter wave that has proposed has three classes: direct intensity modulated, external intensity modulation and long-range heterodyne.In millimeter wave generation scheme, the bandwidth and the availability of frequency spectrum are the problems that technical research is concerned about most.Producing high-frequency optical millimeter wave as simple photonic device how is the emphasis point of dealing with problems.Frequency-doubling millimeter wave generating technique based on four-wave mixing effect has also effectively solved this problem.【QingWang，“Millimeter-wave?frequency?tripling?based?on?four-wave?mixing?ina?Semiconductor?optical?amplifier”，IEEE?Photonics?Technology?LettersVol.18，No.23，2006：2460-2462，2006】，【Andreas Wiberg，“Microwave-photonic frequency multiplication?utilizing?opticalfour-wave?mixing?and?fiber?Bragg?gratings”，IEEE?Photonics?TechnologyLetters，Vol.24，No.1，2006：329-334，2006】。But currently used these optical millimeter wave generating techniques all are first modulated light signals forms millimeter-wave signal, and then carries out the modulation of base-band data signal.Two processes will adopt more photonic device, increase system cost.
In order to address the above problem, our scheme adopts a local oscillated signal (LO) and base-band data signal mixing, is used for direct modulated light signal.Regulate the bias voltage of MZ Mach-Zehnder (MZM), realize the carrier suppressed modulation of light signal, form the modulation signal that only contains two single order sidebands.Modulation signal passes through four wave mixing (FWM) unit again and forms a new mixing sideband respectively on two single order sideband both sides after erbium-doped fiber amplifier (EDFA) carries out power amplification.Adopt original two the single order sidebands of tunable optic filter filtering, two new mixing sidebands are carried out the millimeter-wave signal that beat frequency just can form six frequencys multiplication at the Photoelectric Detection end.Apparatus of the present invention produce new mixing sideband (wherein the four wave mixing unit can be made of highly nonlinear optical fiber or semiconductor optical amplifier) based on optical non-linear effect such as four wave mixing (FWM) unit.Can reduce the frequency in the local oscillation signal source of use like this, reduce the bandwidth requirement of frequency mixer, optical modulator, so the present invention program has also saved system cost in the increase signal bandwidth on the basis of the raising availability of frequency spectrum.
(3) summary of the invention
The present invention is directed to above-mentioned situation, what solved optical millimeter wave is created in bandwidth, the existing problem in availability of frequency spectrum aspect, with local oscillated signal (LO) and base-band data signal mixing, be used for direct modulation system modulated light signal with carrier suppressed, form a new mixing sideband through four wave mixing (FWM) unit respectively on two single order sideband both sides, through the original single order sideband of filter filtering, just will form the millimeter-wave signal of modulated base-band data signal behind the new mixing sideband beat frequency, system configuration is simple, and cost is low.The present invention is based on two kinds of different formation devices of four wave mixing in the system (FWM) unit, provide the millimeter wave of two kinds of frequencys multiplication to produce scheme.
In order to achieve the above object, the scheme of the optical millimeter wave of frequency multiplication of the present invention generation is as follows:
Utilize single-mode laser to produce a continuous light signal; Adopt a local oscillated signal (LO) and base-band data signal mixing, by the direct modulated light signal of MZ Mach-Zehnder (MZM); Regulate the bias voltage of MZ Mach-Zehnder (MZM), realize the carrier suppressed modulation of light signal, form the modulation signal that only contains two single order sidebands; This modulation signal has loaded base-band data signal; Modulation signal passes through four wave mixing (FWM) unit again and forms a new mixing sideband respectively on two single order sideband both sides after erbium-doped fiber amplifier (EDFA) carries out power amplification; Adopt original two the single order sidebands of tunable optic filter filtering two new mixing sidebands in photoelectric detector to carry out the millimeter-wave signal that beat frequency just can form the frequency multiplication of carrying base-band data signal.
The present invention directly is used for modulated light signal with base-band data signal and local oscillated signal (LO) mixing in modulated terminal, form millimeter-wave signal with first modulated light signal in the past, the scheme of modulating baseband data-signal is compared again, save the quantity of photonic device and reduced the bandwidth requirement of device, therefore reduced the cost of millimeter wave generating device.The present invention is based on the scheme of the optical millimeter wave signal of quadruple (FWM) effect generation frequency multiplication, increased signal bandwidth, improve the availability of frequency spectrum greatly.
(4) description of drawings
Fig. 1 is device implementation one structural representation of the present invention;
Fig. 2 is device implementation two structural representations of the present invention.
Among the figure:
1-single-mode laser (DFB)
11-single-mode laser (DFB)
2-Mach-Zehnder modulators (MZM)
22-Mach-Zehnder modulators (MZM)
3-erbium-doped fiber amplifier (EDFA)
33-erbium-doped fiber amplifier (EDFA)
The 4-adjustable light wave-filter
The 44-adjustable light wave-filter
5-highly nonlinear optical fiber (HNLF)
The 6-semiconductor optical amplifier (SOA)
7-four wave mixing (FWM) unit
77-four wave mixing (FWM) unit
The 8-base-band data signal
The 88-base-band data signal
9-local oscillated signal (LO)
99-local oscillated signal (LO)
10-electricity frequency mixer
11-is based on the frequency-doubling millimeter wave signal output of highly nonlinear optical fiber (HNLF)
The frequency-doubling millimeter wave signal output of 12-based semiconductor image intensifer (SOA)
(5) embodiment
Below in conjunction with concrete experimental example and accompanying drawing, the present invention is specified.By shown in Figure 1, each parts that the millimeter wave of frequency multiplication produces in the scheme one are respectively described below: single-mode laser 1 is used to produce the single longitudinal mode light carrier of specified wavelength;
Mach-Zehnder modulators 2 is used for the single longitudinal mode light carrier of specified wavelength is carried out the carrier suppressed modulation; Erbium-doped fiber amplifier 3 is used for the power amplification to modulation signal;
Highly nonlinear optical fiber 5 is used for forming a new mixing sideband respectively on two single order sideband both sides of modulation signal, and wherein the frequency interval of two new mixing sidebands is six times of local oscillators (LO) frequencies;
Adjustable light wave-filter 4 is used for two single order sidebands of filtering modulation signal;
Base-band data signal 8 refers to the data-signal of down link;
Local oscillated signal 9 is used for and the base-band data signal mixing, directly the modulated optical carrier signal;
Frequency mixer 10 is used for base-band data signal and local oscillated signal are carried out mixing;
It is as follows that the optical millimeter wave of frequency multiplication of the present invention produces scheme one work engineering:
Utilize single-mode laser 1 to produce a continuous light signal; Adopt a local oscillated signal 9 and base-band data signal 8 mixing, by MZ Mach-Zehnder 2 direct modulated light signals; Regulate the bias voltage of MZ Mach-Zehnder (MZM), realize the carrier suppressed modulation of light signal, form the modulation signal that only contains two single order sidebands; This modulation signal has loaded base-band data signal; Modulation signal forms a new mixing sideband through highly nonlinear optical fiber 5 respectively on two single order sideband both sides again after erbium-doped fiber amplifier 3 carries out power amplification; Wherein the frequency interval of two new mixing sidebands is six times of local oscillators (LO) frequencies; Adopt original two the single order sidebands of tunable optic filter 4 filterings; At the Photoelectric Detection end two remaining new mixing sidebands are carried out the millimeter-wave signal that beat frequency just can form six frequencys multiplication of carrying base-band data signal.
By shown in Figure 2, each parts that the millimeter wave of frequency multiplication produces in the scheme two are respectively described below:
Single-mode laser 11 is used to produce the single longitudinal mode light carrier of specified wavelength;
Mach-Zehnder modulators 22 is used for the single longitudinal mode light carrier of specified wavelength is carried out the carrier suppressed modulation;
Erbium-doped fiber amplifier 33 is used for the power amplification to modulation signal;
Semiconductor optical amplifier 6 is used for forming a new mixing sideband respectively on two single order sideband both sides of modulation signal, and wherein the frequency interval of two new mixing sidebands is six times of local oscillators (LO) frequencies;
Adjustable light wave-filter 44 is used for two single order sidebands of filtering modulation signal;
Base-band data signal 88 refers to the data-signal of down link;
Local oscillated signal 99 is used for and the base-band data signal mixing, directly the modulated optical carrier signal;
Frequency mixer 10 is used for base-band data signal and local oscillated signal are carried out mixing;
Utilize single-mode laser 11 to produce a continuous light signal; Adopt a local oscillated signal 99 and base-band data signal 88 mixing, by MZ Mach-Zehnder 22 direct modulated light signals; Regulate the bias voltage of MZ Mach-Zehnder (MZM), realize the carrier suppressed modulation of light signal, form the modulation signal that only contains two single order sidebands; This modulation signal has loaded base-band data signal; Modulation signal forms a new mixing sideband through semiconductor optical amplifier 6 respectively on two single order sideband both sides again after erbium-doped fiber amplifier 33 carries out power amplification; Wherein the frequency interval of two new mixing sidebands is six times of local oscillators (LO) frequencies; Adopt original two the single order sidebands of tunable optic filter filtering; At the Photoelectric Detection end two new mixing sidebands are carried out the millimeter-wave signal that beat frequency just can form six frequencys multiplication of carrying base-band data signal.
(6) major technique advantage
The present invention in modulated terminal directly with base-band data signal and local oscillated signal (LO) mixed modulated light signal, with in the past first modulated light signal form millimeter-wave signal again the modulating baseband data-signal compare, save photonic device, the cost of having saved millimeter wave generating device.Optical millimeter wave signal based on quadruple (FWM) effect frequency multiplication produces scheme, increases signal bandwidth, improves the availability of frequency spectrum greatly.
In a word, advantage of the present invention is the optical millimeter wave signal that can produce with lower cost the high-performance frequency multiplication, has reduced the quantity of employed components and parts as far as possible, and stable performance realizes easily.
Claims (4)
1. the frequency-doubling millimeter wave based on the optics four-wave mixing effect produces method for simplifying, it is characterized in that described method may further comprise the steps:
Use continuous-wave laser to produce the continuous light carrier wave;
Adopt a local oscillated signal and base-band data signal mixing;
Mixed frequency signal is used for by a Mach-Zehnder modulators (MZM) modulation continuous light carrier wave, regulate the bias voltage of modulator, realize the carrier suppressed modulation of light signal, form the modulation signal that only contains two single order sidebands, this modulation signal modulated base-band data signal;
Modulation signal carries out power amplification through erbium-doped fiber amplifier;
Signal passes through four wave mixing (FWM) unit again and forms a new mixing sideband respectively on two single order sideband both sides, and wherein the frequency interval of two new mixing sidebands is six times of local oscillators (LO) frequencies;
Adopt original two the single order sidebands of tunable optic filter filtering; At the Photoelectric Detection end two remaining new mixing sidebands are carried out the millimeter-wave signal that beat frequency just can form six frequencys multiplication of carrying base-band data signal.
2. method according to claim 1 is characterized in that: after modulation signal is carried out power amplification, utilize four wave mixing (FWM) to produce two new mixing sidebands on two single order sideband both sides of carrier suppressed modulation.
3. method according to claim 1 is characterized in that: the four wave mixing that is utilized (FWM) unit can adopt highly nonlinear optical fiber (HNLF).
4. method according to claim 1 is characterized in that: the four wave mixing that is utilized (FWM) unit can adopt semiconductor optical amplifier (SOA).
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| CN101339346B (en) * | 2008-08-14 | 2010-06-02 | 上海交通大学 | Device and method for full light generation for quadruple high speed millimeter wave signal |
| CN101388728B (en) * | 2008-10-29 | 2012-04-25 | 北京交通大学 | Apparatus generating millimeter wave based on stimulated Brillouin scattering and photon frequency doubling |
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| CN101982983B (en) * | 2010-10-18 | 2012-12-05 | 电子科技大学 | Method for generating millimetre waves by utilizing semiconductor optical amplifier (SOA) and method and device for applying millimetre waves in radio over fiber (ROF) communication system |
| CN102638310B (en) * | 2012-03-22 | 2014-06-11 | 电子科技大学 | OFDM-PON (orthogonal frequency division multiplexing-passive optical network) system without optical source and radio frequency source in optical network unit |
| TWI483560B (en) * | 2013-06-17 | 2015-05-01 | Univ Nat Taipei Technology | Multiband signal modulation module |
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| CN105007120B (en) * | 2015-07-08 | 2017-08-11 | 北京邮电大学 | The 8 times frequency optical millimeter waves production methods and system cascaded based on light polarization modulator |
| CN106532430B (en) * | 2016-11-24 | 2020-01-31 | 浙江大学 | frequency and wavelength dual tunable frequency modulation continuous wave optical carrier signal generation system |
| CN107733530B (en) * | 2017-10-24 | 2020-04-10 | 湖南师范大学 | Simplified device and method for generating polarization insensitive high-frequency-multiplication optical carrier millimeter wave |
| CN111769876A (en) * | 2020-06-16 | 2020-10-13 | 光创新电(苏州)信息科技有限公司 | Vector millimeter wave signal generation system based on optical carrier suppression without precoding |
| CN111769879A (en) * | 2020-06-16 | 2020-10-13 | 光创新电(苏州)信息科技有限公司 | System for generating vector signal based on optical carrier suppression and using method thereof |
| CN114221708B (en) * | 2021-12-14 | 2023-08-15 | 湖南师范大学 | Low-cost wide-tunable high-frequency millimeter wave/sub-millimeter wave optical carrier signal generating device and method based on phase modulation |
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| CN1479479A (en) * | 2003-07-29 | 2004-03-03 | 北京大学 | Wave division complex mm wave light source row and corresponding optical fiber transmission radio signal communiation sysem |
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