Abstract
This paper reports a hybrid integrated light source fabricated on a Si platform using a spot-size
converter (SSC) with a trident Si waveguide. Low-loss coupling for 1.55 μm and 1.3 μm wavelengths was
achieved with merely the simple planar form of a Si waveguide with no use of complicated structures such as vertical
tapers or an extra dielectric core overlaid on the waveguide. The coupling loss tolerance up to a 1 dB loss
increase was larger than the accuracy of our passive alignment technology. The coupling efficiency was quite robust
against manufacturing variations in the waveguide width compared with that of a conventional SSC with an inverse taper
waveguide. A multi-channel light source with highly uniform output power and a high-temperature light source were
fabricated with a 1.55 μm quantum well laser and a 1.3 μm quantum dot laser, respectively. The
integration scheme we report can be used to fabricate light sources for high-density, multi-channel Si optical
interposers.
© 2014 IEEE
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