Patent ID: 6618411
Filing Date: 2003-09-09
Classification: H01S

Abstract:
A ridge waveguide semiconductor laser comprising:a first conductivity type InP substrate; and successively disposed on said InP substrate, a first conductivity type cladding layer of AlxGayIn1âˆ’xâˆ’yAs (0an active layer of Alx1Gay1In1âˆ’x1âˆ’y1As (01, 01, x1+y1<1), a second conductivity type cladding layer of Alx2Gay2In1âˆ’x2âˆ’y2As (02, 02, x2+y2<1), a first InP cladding layer of the second conductivity type, an etching stopping layer of InaGa1âˆ’aAsbP1âˆ’b (0a second InP cladding layer of the second conductivity type, said second InP cladding layer having a ridge shape with respective opposed sides, each side including a first portion substantially perpendicular to said InP substrate and a second portion, between the first portion and said InP substrate, oblique to said InP substrate, so that said ridge has a first portion of uniform width and a second portion that becomes wider in a direction extending from the first portion toward said InP substrate.