Polarisation independent mode transformers were fabricated by core thickness tapering in uncladded InGaAsP/InP rib waveguides intended for integration into PICs. No epitaxial regrowth is needed. The coupling loss for flat-end fibres is reduced to (2.3 ± 0.2) dB at alignment tolerances of >±2.4 µm for 1 dB excess loss.
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Albrecht et al. (1996) studied this question.
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