An Investigation of Mode Partitioning in VCSELS

Coe, Paul

HP Development Company

关键词: mode partitioning;    VCSEL;   

RP-ID  :  HPL-96-143

学科分类：计算机科学（综合）

美国|英语

来源: HP Labs

【 摘 要 】

Mode partitioning, quantified in terms of a normalised mode partitioning parameter k, was investigated in laser diodes operating under CW and PRBS modulation @ 1.0625 Gbit/s. A comparison was made between VCSELs and Fabry-Perot edge emitters. Individual laser modes, (or in the case of VCSELs, groups of modes), were preselected using an optical spectrum analyser and monitored using a sensitive APD. By monitoring the statistical distribution of the APD signal, the modal fluctuations were recorded and used to calculated k. The value of k was found to be higher, indicating stronger mode partitioning, when the bias current was closer to threshold for CW operation and when the laser was switched rapidly under modulation.