Proceedings PaperOptimisation Of The Coupling Efficiency Between A Semiconductor Laser And A Monomode Optical Fibre
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The coupling efficiency between semiconductor lasers and single mode fibres can be greatly increased if a microlens of appropriate focal length is fabricated at the end of the fibre, the reason being that the lens can effectively improve the mode matching of the laser and fibre fields. Using simple techniques we have fabricated hemispherical microlenses at the end of fibres. Coupling efficiencies of about 50% have been achieved. The thoery used to predict the lens parameters for maximum coupling regards the lens as a 'thick lens' and shows that spherical aberration contributes to coupling loss.