LAPAREX-An Automatic Parameter Extraction Program for Gain-and Index-Coupled Distributed Feedback Semiconductor Lasers, and Its Application to Observation of Changing Coupling Coefficients with Currents

摘要

A reliable and automatic parameter extraction technique for DFB lasers is developed. The parameter extrac- tion program which is named "LAPAREX" is able to determine many device parameters from a measured sub-threshold spectrum only, including gain-and index-coupling coefficients, and spatial phases of the grating at front and rear facets. Injection current dependence of coupling coefficients in a gain-coupled DFBlaser is observed, for the first time, by making use of it.