Laser with unbalanced Michelson interferometer optical cavity

摘要

A laser has an optical laser cavity one end of which is formed in optical waveguide by an unbalanced Michelson interferometer comprising an optical waveguide splitter/combiner 23 and two optical waveguide Bragg grating reflectors, 24a, 24b. The unbalance may be achieved by using an unbalanced (non-3dB) splitter combiner, by locating the Bragg grating reflectors 24a, 24b at different distances from the splitter/combiner 23 or by using chirped gratings of different rates of chirp but the same bandwidth.