基于半导体光放大器的高速全光信号处理技术的研究
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摘要
对于目前的通信网络,其传输与交换能力严重失衡,这已成为通信界的共识,而基于光-光相互作用的高速全光信号处理技术是解决这一难题有效、直接的途径。由于具有体积小、功耗低、可集成的优点,以半导体光放大器(SOA)为核心的全光信号处理技术近年来得到广泛的研究。本文以SOA为核心,在全光信号处理技术领域进行了相关的理论及实验研究工作,并取得了以下研究成果:
     利用SOA中交叉增益调制(XGM)、交叉相位调制(XPM)效应,提出了一种基于一个SOA的全光组播及串-并转换的实现方案;针对该方案,设计、完成了窄脉冲光源,以及波长数目可调的波-时分脉冲光源;在此基础上实现了10 Gbit/s?4×10 Gbit/s的全光组播、以及40 Gbit/s?4×10 Gbit/s的全光串-并转换的实验。实验结果表明,对于恶化的输入信号,该方案输出信号的光信噪比能够得到显著提升。
     首次提出了“两入两出波长变换”的概念,指出这种波长变换器对于全光波长变换技术的大规模应用具有巨大意义;利用SOA中四波混频(FWM)的特性设计了一种能够同时对两路独立编码信号进行波长变换的方案,该方案只需一个SOA,且无需外加探测光;利用铌酸锂马赫-曾得幅度调制器满足了该方案对输入信号的要求,并实验完成了10 Gbit/s的、基于一个SOA的“两入两出”波长变换系统。
     通过对SOA多种非线性效应(XGM、XPM、FWM)特性的掌握,提出了基于一个SOA、可重构的全光基础逻辑实现方案,实验实现了10 Gbit/s的、包括“非( A)”、“或非( A? B)”、“A? B( A? B)”、“与(A?B)”、以及“同或(A⊙B)”等多种基础逻辑。对实验得到的各种逻辑输出信号质量进行了分析,证明了该方案的可行性及可级联能力。
     首次提出了一种采用两个SOA、可重构的(半加器、半减器)全光组合逻辑的实现方案。分析了该方案的工作原理及特点,完成了10 Gbit/s的全光半加器、半减器系统实验,并研究了各级信号的输出脉冲质量。本方案中的组合逻辑是通过各种基础逻辑级联而实现的,因此它具有更大的升级潜力及更广的应用范围。
All-optical signal processing (AOSP) is an essential issue for high-speed next generation optical networks. In the last few years, many AOSP techniques have been proposed using nonlinear effects in semiconductor optical amplifiers (SOAs) because of small footprint, low power consumption and ease of optical integration. In this thesis, some of AOSP technologies, which are based on SOAs, have been researched and demonstrated.
     An optical multicast shceme and an optical serial-to-parallel scheme have been proposed which using the interaction of cross-gain modulation (XGM) and cross-phase modulation (XPM) in a SOA. To fulfill the proposed schemes, an optical short pulse source and a time- and wavelength-interleaved pulse source have been finished. Using the multi-wavelength pulse source, the optical multicast (10 Gbit/s?4×10 Gbit/s) has been realized experimentally. Using the time- and wavelength-interleaved pulse source, the optical serial-to-parallel operation (40 Gbit/s?4×10 Gbit/s) has been accomplished in experiment. Both of the experiments’results show that the output signals of the two proposed schemes have better OSNR than the degraded input signals.
     A novel wavelength conversion scheme, named“2-to-2 WC”is proposed at the first time. The scheme, which is based on four-wave micing (FWM) in a SOA and without using any external probes, can simultaneously convert 2 input signals into 2 ouput signals with diffirent wavelengths. We use a LiNbO3 M-Z amplitude modulator to obtain input signals suited for the scheme. In experiment, a SOA-based 10 Gbit/s“2-to-2”WC is accomplished.
     Based on various nonlinearities in single SOA, we propose a reconfigurable optical logic scheme. The scheme can performs NOT, NOR,“A? B”, AND, XNOR functions using a SOA and an optical bandpass filter. The extinction ratio and OSNR of the output signals in various logic gates have been experimentally investigated.
     Using two SOAs, we design a complex optical logic scheme which can realize both optical half-adder and optical half-subtracter. The operating principle of the proposed scheme has been discussed and the performances of the scheme have been investigated in 10 Gbit/s experiment.
引文
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