Laser diodes monolithically integrated with spot-size converters operating at 1.3 µm and having an almost circular far-field pattern and a –1.3 dB butt-coupling-loss-to-fibre with wide alignment tolerance have been successfully fabricated on 2 inch substrates. The overall device length is as short as 450 µm.
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Wada et al. (1995) studied this question.