Patent ID: 8306375
Filing Date: 2012-11-06
Classification: B82Y,G02F,H01S

Abstract:
1. A wavelength-tunable optical transmitter comprising: a semiconductor substrate; a wavelength-tunable light source that is formed on the semiconductor substrate and comprises at least a first reflector of a wavelength-tunable type, a second reflector, a gain region formed between the first and second reflectors, and a first semiconductor optical waveguide smoothly connected to the gain region and leading to the second reflector; a semiconductor optical modulator that is formed on the semiconductor substrate; a second semiconductor optical waveguide that is formed on the semiconductor substrate and smoothly connected to the semiconductor optical modulator; and a waveguide coupling region in which the first and second semiconductor optical waveguides are collinearly coupled to each other with a length L wherein the second reflector is formed at an end of the waveguide coupling region.