Patent ID: 9601906
Date: 2017-03-21
CPC Classifications: G02B,H01S

Claim:
1. A wavelength-tunable light source, comprising: an optical coupling circuit that has an input portion connected to an output end of at least one input waveguide, has output portions connected to input ends of two output waveguides, and outputs light input from said at least one input waveguide to said two output waveguides; a semiconductor laser connected to an input end of said at least one input waveguide; a first optical amplifier and a second optical amplifier connected to corresponding output ends of said two output waveguides; and a first output portion and a second output portion respectively outputting the light passing through said first optical amplifier and said second optical amplifier, wherein a first arm portion and a second arm portion have an arrangement distance therebetween greater than a distance between said input ends of said two output waveguides and greater than a distance between an output end of said first output portion and an output end of said second output portion, said first arm portion forming a traveling path of light from one of said two output waveguides to said first output portion through said first optical amplifier, said second arm portion forming a traveling path of light from the other one of said two output waveguides to said second output portion through said second optical amplifier, and said first optical amplifier and said second optical amplifier have curved portions in which said first output portion and said second output portion are curved in a direction toward each other, and said first optical amplifier and said second optical amplifier respectively output light from said output end of said first output portion and said output end of said second output portion.