基于半导体光放大器差分平衡控制的全光相位调制研究

All-Optical Phase Modulation Based on Semiconductor Optical Amplifier Differential Balance Control Optical Signal

不经过光电转换的全光相位调制是实现无电中继的相干通信的关键技术之一。半导体光放大器(Semiconductor Optical Amplifier,SOA)由于具有非线性系数高、体积小等优点成为全光相位调制系统的关键器件。但因SOA中交叉相位调制与交叉增益调制同时存在,使目前基于SOA的相位调制信号不可避免地产生功率起伏,影响了信号质量。为此,提出了一种利用差动平衡信号控制级联SOA的全光相位调制方案,分析了方案原理,并实验实现了全光相位调制,消除了相位调制过程中因SOA交叉增益调制效应产生的波形起伏,完成了原理验证。该调制方案对实现高阶编码格式的全光波长变换,提升网络的灵活性和扩展性具有重要意义。

All-optical phase modulation is an important part of all-optical signal processing,which is of great significance to the realization of all-optical networks.Semiconductor optical amplifier(SOA)is a key component of all optical phase modulation system because of its high nonlinear coefficient and small size.However,due to the concurrence of cross phase modulation and cross gain modulation in SOA,the power fluctuation of current SOA-based phase modulation signals is inevitable,which affects the signal quality.Therefore,an all-optical phase modulation scheme of cascading SOA controlled by differential balance signal is proposed,and the principle of the scheme is analyzed.Then,the all-optical phase modulation is realized through experiments,and the waveform fluctuation caused by SOA cross gain modulation is eliminated during the phase modulation process,and the principle is verified.This modulation scheme is of great significance to realize all-optical wavelength conversion for high-order coding formats and improve the flexibility and expansibility of the network.