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Marked low-loss coupling between a laser diode and a single-mode fibre has been realised, utilising a planoconvex, high-numerical-aperture graded-index rod lens with greatly improved small wavefront aberration.
A connector is described in which two lenses make a 1-1 image of the emitting fibre end upon the receiving end. This type of connector is not sensitive to surface contamination, radial offset and separation. It contains no high-precision components and the prealignment procedure is very simple. Average losses of 1.0 dB were obtained, which can be improved to 0.65 dB if antireflection coatings are...
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