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We demonstrate low-loss optical mode-size tapers in InGaAsP/InP optical waveguides fabricated by selective organometallic chemical vapor deposition. The tapers increase the vertical mode size by ≊300%. Taper losses as low as 0.4 dB (on-chip, excluding coupling) were achieved, with 2.6 dB coupling loss to a flat-end, single-mode fiber at 1540 nm wavelength.
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Deri et al. (1992) studied this question.
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