| CPC H01S 5/1014 (2013.01) [H01S 5/101 (2013.01); H01S 5/4093 (2013.01)] | 19 Claims |
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1. A light emitting device comprising:
a plurality of laser diodes aligned along a predetermined direction, the plurality of laser diodes including
a first laser diode configured to oscillate at a first peak wavelength to emit first light, and
a second laser diode configured to oscillate at a second peak wavelength to emit second light, the second peak wavelength being longer than the first peak wavelength;
a planar lightwave circuit including
a first optical waveguide configured to receive the first light at a first light-incident end, to guide the first light, and to emit the first light from a first light-exiting end with the first light being refracted at the first light-exiting end to exit in a first direction which is inclined with respect to a normal direction of the first light-exiting end, and
a second optical waveguide configured to receive the second light at a second light-incident end, to guide the second light, and to emit the second light from a second light-exiting end with the second light being refracted at the second light-exiting end to exit in a second direction which is inclined with respect to a normal direction of the second light-exiting end,
a center-to-center distance between the first light-exiting end and the second light-exiting end being shorter than a center-to-center distance between the first light-incident end and the second light-incident end; and
a lens to which the first light exiting from the first light-exiting end and the second light exiting from the second light-exiting end are incident, the lens being arranged with respect to the planar lightwave circuit so that a first distance from the first light-exiting end to a surface of the lens along the first direction is shorter than a second distance from the second light-exiting end to the surface of the lens along the second direction,
wherein,
in a plan view, a waveguiding direction of the first optical waveguide intersects the normal direction of the first light-exiting end at a first angle, and a waveguiding direction of the second optical waveguide intersects the normal direction of the second light-exiting end at a second angle, the first angle being smaller than the second angle.
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