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Semiconductor lasers with short integrated mode expanders for efficient coupling to fiat-ended singlemode fibres are presented. Laser-to-fibre coupling efficiencies of –3 dB, an improvement of 7 dB compared with conventional laser diodes, have been achieved. Simultaneously, the lateral alignment tolerances, for a 1 dB reduction of the coupling efficiency have been relaxed to ±1.8 µm.
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Brenner et al. (1995) studied this question.
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