Uniform frequency modulation responses in narrow linewidth (>or=200 kHz) compact hybrid lasers

摘要

Uniform frequency modulation (FM) response and narrow linewidth (>or=200 kHz) are obtained simultaneously from a compact hybrid single frequency semiconductor laser. The hybrid laser consists of a two-electrode gain section, responsible for the uniform FM response, and a narrow band resonant optical reflector (ROR), responsible for the narrow linewidth. Uniform red shifted FM (DC to 200 MHz) is obtained when the section of lower injection current is modulated. The uniform FM response is attributable to inhomogeneous linewidth enhancement in the two laser sections created by nonuniform carrier injection.