Abstract

A fiber-grating external-cavity-laser (FG- ECL) is very promising as a stable singlemode light source in optical fiber communication systems.^1-3 One of the inherent advantages of the FG-ECL is temperature stability of an emission wavelength. With respect to high-temperature operation 155 Mbit/s data transmission at 40°C² and 1 mW output at an injection current of 110 mA at 65°C¹ were reported. The temperature dependence of the FG-ECL still needs improving to operate without temperature control. We have investigated temperature dependence of 1.3-µm FG-ECLs with various detunings between the Bragg wavelength of FGs (λ_FG) and the gain peak wavelength of semiconductor optical amplifiers (λ_SOA), of which an active region is MQW structure. We have obtained both good side-mode suppression ratio (SMSR) and low operation current over a wide temperature range, when a detuning at 25°C is zero.

© 1996 Optical Society of America