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High-efficiency two lens laser diode to single-mode fiber coupler with a silicon plano convex lens

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2 Author(s)
Karstensen, H. ; Siemens AG, Munich, West Germany ; Frankenberger, R.

A theory for the calculation of the spherical aberration loss of silicon planoconvex lenses is presented. The aberration losses are calculated as a function of the lens parameters. Furthermore, a theory for the coupling efficiency of a laser diode to single-mode fiber for a coupling arrangement consisting of a silicon planoconvex lens and a glass ball lens is given. The theoretical predictions are in good agreement with measurements. Experimentally, a coupling efficiency of 72% (1.4-dB coupling loss) was achieved for a laser diode with farfield angles of 20 degrees *33 degrees FWHM and a not yet fully optimized silicon planoconvex lens.<>

Published in:

Lightwave Technology, Journal of  (Volume:7 ,  Issue: 2 )

Date of Publication:

Feb. 1989

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