High efficiency, long working distance laser diode to singlemode fibre coupling arrangement

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High efficiency, long working distance laser diode to singlemode fibre coupling arrangement

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The authors describe a technique for coupling laser diode (LD) light into a singlemode fibre (SMF) which yields an efficiency as high as 85%, for uncoated micro-optics, with a working distance of 40 µm. The 1 dB excess loss alignment tolerances are ±0.9 and ±4 µm on transverse and optical axes, respectively. This is, to our knowledge, the best optimisation ever reported of the triplet ‘coupling efficiency, working distance, and alignment tolerances’ for an uncoated fibre micro-optics arrangement.

Inspec keywords: gradient index optics; optical couplers; optical fibres; reflectivity; lenses; semiconductor lasers

Other keywords: 85 percent; coupling efficiency; laser diode; long working distance; optical axes; singlemode fibre coupling; laser diode light; alignment tolerances; optimisation; working distance; transverse axes; high efficiency; uncoated micro-optics; 40 mum; excess loss alignment tolerance

Subjects: Semiconductor lasers; Lasing action in semiconductors; Fibre optics; Fibre couplers and connectors; Gradient-index (GRIN) fibre devices and techniques

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