Light source circuit and light source device equipped with same

摘要

A light source circuit transmits light incident from a semiconductor laser source to a plurality of optical devices. At least one optical branch section is formed to branch one input-side optical waveguide at least into a first output-side optical waveguide terminal and a second output-side optical waveguide terminal. A light path length (L1) between the optical branch section and a next-stage optical branch section or the optical device is connected to the first output-side optical waveguide extending from the optical branch section and a light path length (L2) between the optical branch section and the next-stage optical branch section selected such that the absolute value of a difference between (L1) and (L2) is (¼+i/2) times (i is zero or a positive integer) the wavelength of the light transmitted through the light source circuit.

主权项

1. A light source circuit in which at least one optical branch section for branching one input side optical waveguide into at least a first output side optical waveguide and a second output side optical waveguide is formed on a substrate, and light incident from a semiconductor laser light source is transmitted to a plurality of optical devices, comprising:
a phase control structure for controlling a light path length in which a light path length L1 of an optical waveguide between the optical branch section and a next-stage optical branch section or an optical device which is connected to the first output side optical waveguide extending from the optical branch section, and a light path length L2 of an optical waveguide between the optical branch section and a next-stage optical branch section or an optical device which is connected to the second output side optical waveguide are controlled such that an absolute value of a difference between the light path length L1 and the light path length L2 is (¼+i/2) times (i is 0 or a positive integer) a wavelength of the light propagated through the light source circuit.