Strain measurement and estimation of photoelastic effects and strain-induced optical gain change in ridge waveguide lasers

Measurement of the strain in the plane of the active region for 1.3 μm InGaAsP ridge waveguide lasers is presented. A strain model is examined and compared with experimental results. The changes in the refractive index and the optical gain owing to the measured strain are estimated. These results are important information for device simulation, modelling, and interpretation of experimental results.