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High butt-coupling efficiency to single mode fibers using a 1.55 /spl mu/m InGaAsP laser integrated with a tapered ridge mode transformer

By: Johnson, F.G.; Dagenais, M.; Agrawala, S.; Whaley, R.; Stone, D.; Saini, S.S.; Bartolo, R.E.; Vusirikala, V.;

1997 / IEEE / 0-7803-3895-2

Description

This item was taken from the IEEE Conference ' High butt-coupling efficiency to single mode fibers using a 1.55 /spl mu/m InGaAsP laser integrated with a tapered ridge mode transformer ' The 1.55 /spl mu/m wavelength window is important for future WDM systems, and hence there has been considerable interest in realizing mode expanded lasers at this wavelength. Here, we present a mode expanded laser based on a tapered ridge design, which was grown in a single epitaxial step, and required only conventional lithography and etching techniques. This device showed reduced far-field divergence angles and high coupling efficiencies to a standard cleaved single mode fiber (3.7 dB loss). To our knowledge, this is the lowest loss demonstrated in longer wavelength devices fabricated without using regrowth.