A waveguide to waveguide coupled hybrid master oscillator power amplifier (MOPA) includes a wavelength locked laser master oscillator (MO) first chip including a semiconductor substrate, a waveguide region having a gain section, one side of the MO including an integrated wavelength selective feedback...http://www.google.se/patents/US7388894?utm_source=gb-gplus-sharePatent US7388894 - Hybrid MOPA having narrowband oscillator and amplifier with integrated optical coupling
