18- and 100-port fibre-optic coupler systems are driven by 10 emitter laser arrays capable of CW output powers in excess of 500 mW/facet. This source has advantages over both LEDs and conventional laser diodes, including insensitivity to feedback, no modal noise, ease of coupling and a very high launched power per output fibre.
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Scifres et al. (1982) studied this question.
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