Optical waveguide and the method for making the same, in which a semiconductor laser diode and an optical isolator are formed on one substrate in a monolithic manner. At the moment, a semiconductor laser diode is made by a III-V compound semiconductor crystal, such as GaAs, InP, etc., and an optical...http://www.google.es/patents/US4691983?utm_source=gb-gplus-sharePatente US4691983 - Optical waveguide and method for making the same
