级联OPC的MZI再生芯片相位保持性能研究  

Research on Phase⁃Preserving Performance of OPC⁃Cascaded MZI Regeneration Chips

作　　者：王娅欣 武保剑 郭飚 严伟 汤宇 文峰 邱昆 Wang Yaxin;Wu Baojian;Guo Biao;Yan Wei;Tang Yu;Wen Feng;Qiu Kun(Key Laboratory of Optical Fiber Sensing and Communications,Ministry of Education,School of Information and Communication Engineering,University of Electronic Science and Technology of China,Chengdu 611731,Sichuan,China)

机构地区：[1]电子科技大学信息与通信工程学院光纤传感与通信教育部重点实验室,四川成都611731

出　　处：《中国激光》2023年第19期134-142,共9页Chinese Journal of Lasers

基　　金：国家自然科学基金(62171078)。

摘　　要：许多幅度再生方案可用马赫‐曾德尔干涉仪(MZI)结构进行建模。研究级联光学相位共轭器(OPC)的MZI(OPC‐MZI)再生方案,以实现近乎理想的相位保持再生。通过分析整个级联系统的功率和相位转移特性,优化设计了满足需求的硅基MZI再生芯片单元。采用正交相移键控(QPSK)调制信号仿真验证了OPC‐MZI再生方案的可行性。仿真结果表明:当输入信噪比为16 dB时,与单级MZI再生芯片相比,OPC‐MZI再生方案的噪声抑制比(NRR)可提高1 dB,相位扰动也由5.7°降至0.07°。Objective With the rapid development of modern communication networks,high-order modulation formats such as quadrature phase shift keying(QPSK)and quadrature amplitude modulation(QAM)have been utilized widely for large capacity and high-speed data transmission.However,signals in such modulation formats are easily degraded by channel crosstalk and amplified spontaneous emission(ASE)noise relative to binary signals.In this case,all-optical regeneration technology is helpful to improving optical signalto-noise ratio(OSNR)directly in the optical domain.All-optical amplitude or phase regeneration can be usually achieved by some optical configurations with nonlinear effects,such as Mach-Zehnder interferometer(MZI),nonlinear optical loop mirror(NOLM),phase sensitive amplifier(PSA)and semiconductor optical amplifier(SOA).In the process of all-optical amplitude regeneration,the conversion of amplitude noise to phase disturbance is always introduced to certain extent.For this reason,phase-preserving amplitude regeneration(PPAR)schemes for QPSK or QAM signals are put forward.Unfortunately,there still exists phase disturbance(larger than 3.8°).The objective of our work is to present a perfect PPAR scheme with very low phase disturbance(close to 0°),especially by silicon-based MZI regeneration chips.Methods Most of amplitude regeneration schemes are able to be modeled by a MZI configuration.In this paper,we propose a phase-preserving regeneration scheme of MZI cascading optical phase conjugator(OPC-MZI)to preserve the optical phase of input signals with very low phase disturbance.By analyzing the transmission characteristics of the input signals in the whole cascade system,the silicon-based MZI regeneration chip is designed and optimized as a regeneration unit.Then,the power and phase transfer characteristics of three different regeneration schemes based on the same designed silicon-based MZI regeneration chip are compared.Further,the feasibility of OPC-MZI phase-preserving regeneration scheme is verified by simulation on t

关 键 词：光通信 全光再生 光学相位共轭器 马赫‐曾德尔干涉仪 多级调制信号 

分 类 号：O437.4[机械工程—光学工程]