Patent ID: 7206122
Filing Date: 2007-04-17
Classification: G02F

Abstract:
1. A wavelength converter that is used in an optical communication system utilizing wavelength multiplexing, this wavelength converter for use in optical communications being characterized by the fact that the converter has a quasi-phase matched quartz crystal that has a second-order nonlinear effect, and a light coupling device that mixes the signal light and control light and inputs this mixed light into the quasi-phase matched quartz crystal, wherein the wavelength converter further comprises quartz type optical fibers between the light coupling device and the quasi-phase matched quartz crystal as well as after the quasi-phase matched quartz crystal, the quasi-phase matched quartz crystal comprises an optical waveguide with a periodically inverted sign of the nonlinear optical constant d the mode diameter of the quartz type optical fibers is substantially the same as the mode diameter of the optical waveguide.