4×10Gbit/s并行光模块串扰优化设计

Optimal design of crosstalk in 4×10Gbit/s parallel optical modules

为了对4×10Gbit/s并行光模块光串扰进行优化,采用了ABCD传输矩阵法,结合光纤耦合约束条件以及准直透镜、自聚焦透镜和光纤端面球透镜的理论,设计出两套优化方案。研究了垂直腔面发射激光器光束特性,利用MATLAB进行理论分析,模拟得出光斑半径与发散角的关系,并分析了串扰情况。在ZEMAX非序列模式下完成了光路建模,优化结构中透镜参量以及光纤端面设计,进行了理论分析和实验验证,取得了优化后耦合光斑半径与耦合效率。结果表明,间接耦合优化结构中,到达光纤端面的光斑为53.72μm,耦合效率达到72.59%;而直接耦合优化结构中,到达光纤端面的光斑为3.695μm,耦合效率高达到76.11%,有效地解决了并行光模块之间的光串扰问题。这一结果对光网络信号传输质量优化方面是有帮助的。

In order to realize crosstalk optimization of 4 × 10Gbit/s parallel optical modules,by using the ABCD transfer matrix method,combining with the optical fiber coupling constraint and the theory of collimating lens,focus lens and fiber end surface of the ball lens,two sets of optimization schemes were designed. Beam characteristics of vertical cavity surface emitting lasers( VCSEL) were studied,the relationship between the spot radius and divergence angle was simulated by using MATLAB,and crosstalk situation was analyzed. Optical modeling in ZEMAX non-sequential mode was founded,the parameters of lens structure and the design of fiber end face were optimized. After theoretical analysis and experimental verification,the optimized coupling beam radius and coupling efficiency were obtained. The results show that in indirect coupling optimization structure,light spot at the end of fiber is 53. 72μm,coupling efficiency is up to 72. 59%. In direct coupling optimization structure,light spot at the end of fiber is 3. 695μm,and coupling efficiency is up to 76. 11%. The design effectively solves the problem of optical crosstalk between parallel optical modules. The study is helpful for the optimization of transmission quality of optical network signal.