The amount of reflected light fed back in the coupling of semiconductor lasers and tapered hemisphericalend (TH) fiber is estimated. Reflection from incident hemisphere is estimated to be below -50 dB, from the loss in the coupling between the laser and its virtual image. For multimode TH fiber reflection of backward-propagating light from connections can be reduced to below -50 dB by an ~10-µm lateral displacement parallel to the junction plane; there is a small penalty in forward-coupling efficiency. The reduction of reflection is confirmed by measuring relative intensity noise of coupled laser light.

© 1983 Optical Society of America

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