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Research Of All Optical Wavelength Conversion Based On Four Wave Mixing Effect

Posted on:2017-05-04Degree:MasterType:Thesis
Country:ChinaCandidate:X L YanFull Text:PDF
GTID:2308330488482485Subject:Signal and Information Processing
Abstract/Summary:PDF Full Text Request
All-optical wavelength conversion technology(AOWC: All-Optical Wavelength Converter) is the key technology in WDM(WDM: Wavelength Division Multiplexing) optical network. Through wavelength conversion, it can convert the signal from one wavelength to another wavelength, thereby achieving dynamic allocation wavelength interconnection of heterogeneous networks, effectively solve network congestion problems wavelength channels, improve the flexibility and reliability of the network. Currently, four-wave mixing(FWM: Four-Wave Mixing) is the only effect can be achieved strictly transparent bit rate and modulation format modulation, and can be set to a plurality of signals WDM optical network wavelength conversion technology at the same time and can achieve high bit rate transmission. Therefore, the research and its application, has aroused widespread concern, based on the semiconductor optical amplifier(SOA: Semiconductor Optical Amplifier) wavelength conversion technology has become a hot research topic. Now mainly used research methods based on simulation and modeling of SOA-FWM all-optical wavelength conversion technology, specifically as follows:At first, we discuss the importance and research purposes of all-optical wavelength conversion technology, describes the current research and comprehensive analysis of the AOWC technology and carries on the classification, according to the principles of different wavelength conversion technology and analyze its strengths and weaknesses, It focuses on the SOA-FWM all-optical wavelength conversion technology.Secondly, this paper is focused on the dynamic characteristics of SOA, and through transport equation and carrier rate equation is derived to study its nonlinear effect. The ultrafast nonlinear effects in SOA operating in the counter-propagating modes were numerically simulated and analyzed on aspects of gain, phase and chirp ultrafast dynamic properties. It discusses the SOA intraband effects of carrier heating(CH: Carrier Heating) and spectral hole burning(SHB: Spectral Hole Burning), as well as interband effects carrier depletion(CD: Carrier Depletion) impact on the SOA output gain, phase and chirp, respectively. And also analyzed the impact of SOA active region length on the gain dynamic properties. The results show that the ultrafast recovery process of SOA dynamic properties in the counter-propagating scheme, the contribution of CH to gain saturation is larger, and the contribution of SHB is smaller. The CH effect can produce about 0.85 rad of the phase shift, while the SHB effect is very small and negligible. In addition, using short active region length of SOA is more conducive to high-speed all-optical wavelength conversion in the counter-propagating scheme. Theoretical analysis results can provide theoretical guidance for ultrafast all-optical signal processing based on semiconductor optical amplifiers.Then, when the bit rate is 40Gbit/s, the performance of all optical wavelength conversion based on SOA four wave mixing effect were studied. The wavelength conversion of four wave mixing effect in SOA by using continuous wave source. Focus on the wavelength conversion efficiency, extinction ratio, Q factor, signal to noise ratio, bit error rate and converted signal power, and other aspects are analyzed. This paper studies the wavelength down-conversion and wavelength up-conversion, wavelength conversion efficiency and the converted signal power has fallen sharply when the wavelength conversion interval was more than 6nm, but the wavelength down-conversion effect is better than the wavelength up-conversion, wavelength conversion interval is more than 25 nm. It was found that four-wave mixing(FWM) wavelength converter had a low conversion efficiency,-0.7d B, Extinction ratio is 10.2d B, Q-factors is 10.5577, Signal to noise ratio is 28.8d B, and the minimum Bit error rate is1.68794×10-26。Finally, this dissertation presents a new all-optical wavelength conversion scheme based on FWM in SOA power and polarization characteristics, is use of a single SOA achieve two beams of light signal input, transformation of two beams of light output of all-optical wavelength conversion scheme. The scheme is mainly using two beams of extinction ratio(ER:Extinction Ratio) deterioration in the return to zero code(RZ:Return-Zero) as the input signal light, using SOA four wave mixing effect, the two beams of independent of the input signal light to carry information transmission were copied to the wavelength conversion of different frequencies of the idle frequency light, so that the new generation of idle frequency light carries the information of the original signal light, and thus a SOA implementation two beams of signal light input transformation of two beams of light output of all-optical wavelength conversion technology. The initial input signal light extinction ratio is 4.8, wavelength conversion after the transformation of light extinction ratio is more than 10, in this process, extinction ratio has been significantly improved and in bit rate for 10Gbit/s return to zero code signal simulation to verify the feasibility of the scheme. According to the characteristics of SOA-FWM is known, due to the FWM effect has the potential for high bit rate transmission. Therefore, the case can be carried out at the rate of 40Gbit/s, and this is our following a main research work.
Keywords/Search Tags:All-optical wavelength conversion, Four-wave mixing, Semiconductor optical amplifier, conversion efficiency
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