High-selectivity spectral multiplexers-demultiplexers usable in optical telecommunications obtained from multidielectric coatings at the end of optical fibers

Robert Richier; Claude Amra

doi:10.1117/12.46985

1 September 1991 High-selectivity spectral multiplexers-demultiplexers usable in optical telecommunications obtained from multidielectric coatings at the end of optical fibers

Robert Richier, Claude Amra

Author Affiliations +

Proceedings Volume 1504, Fiber-Optic Metrology and Standards; (1991) https://doi.org/10.1117/12.46985
Event: ECO4 (The Hague '91), 1991, The Hague, Netherlands

Abstract

Economical and high-performance two-wavelength multiplexers-demultiplexers can be made from correctly cut optical fibers coated at their ends with multidielectric filters and then put together. The authors modelized the filters' performances by assimilating the inhomogeneous guided wave to an open beam whose characteristics depend upon the sort of optical fibers used in the connection and, for this purpose, introduced the notion of equivalent aperture for the guided beam. The validity of the prevision given by this model has been checked for a dichroic filter when the coating separates 850 nm and 1300 nm. Nowadays, the development of telecommunication through optical fibers induces conceivers to consider the use of closer and closer wavelengths. This implies the use of multicavity Fabry-Perot filters. The authors have made multiplexers-demultiplexers for wavelengths as close as 750 nm and 900 nm, set on optical fibers 85/125 with slight insert losses, and an optical crosstalk better than 30 dB. It is also shown that this type of coating can be used to devise multiplexers-demultiplexers working on 1.3 micrometers and 1.5 micrometers wavelengths. The experimental results prove the validity of the model used, and show that this research work can be generalized to different types of optical fibers.

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Robert Richier and Claude Amra "High-selectivity spectral multiplexers-demultiplexers usable in optical telecommunications obtained from multidielectric coatings at the end of optical fibers", Proc. SPIE 1504, Fiber-Optic Metrology and Standards, (1 September 1991); https://doi.org/10.1117/12.46985

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