Single-transverse-mode 1 x n multi-mode interferometer type semiconductor laser device

摘要

In a semiconductor laser device, a first section (S2) including a single-mode waveguide and a second section (S3) including N (N= 2, 3...) single-mode waveguides are provided. A third section (S1) including a 1×N multi-mode interference type waveguide is provided and has an end connected to the first section and has another end connected to the second section.