Patent ID: 6205163
Filing Date: 2001-03-20
Classification: G02B,H01S

Abstract:
A semiconductor laser device for outputting a laser beam in a single transverse mode, comprising an optical waveguide structure including a 1.times.N (N=2, 3, . . . ) multi-mode interference type optical waveguide section which is optically active, said device having one port at a front facet and N ports at a rear facet,wherein said optical waveguide structure comprises a single-mode optical waveguide section connected to one end of said multi-mode interference type optical waveguide section, andwherein a width of said multi-mode interference type optical waveguide is larger than a width of said single-mode optical waveguide, and the width of said multi-mode interference type optical waveguide relative to that of said single-mode optical waveguide section is increased in accordance with N.