Patent ID: 6459829
Filing Date: 2002-10-01
Classification: G02B,H01S,H04B,H04J

Abstract:
An excitation light source comprising:2n lasers, wherein n is an integer greater than 1; n polarization-preserving optical couplers connected to said lasers; an optical multiplexing device which multiplexes lights output from said n polarization-preserving optical couplers; and a reflecting element which is inserted into a neighboring output terminal of said optical multiplexing device and has the function of reflecting, at a low reflection coefficient, multiplexed light output from said optical multiplexing device, wherein said 2n lasers comprise a plurality of groups of lasers, each group of lasers comprising a laser for outputting X polarized wave light and a laser for outputting Y polarized wave light which emit lights of the same wavelength, and the wavelengths of the lights emitted from each group mutually differ from each other.