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In-line optical-fibre filter for wavelength multiplexing

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2 Author(s)
Whalen, M.S. ; AT&T Bell Laboratories, Crawford Hill Laboratory, Holmdel, USA ; Walker, K.L.

An optical-fibre wavelength-selective directional coupler has been fabricated using evanescent-wave coupling between fibres of dissimilar core radii and refractive-index profiles. This device has a nonperiodic filter response with a bandpass of 90 nm FWHM centred around 1.22 ¿m, and has a peak coupling efficiency of 60% with an excess loss of 0.2 dB.

Published in:

Electronics Letters  (Volume:21 ,  Issue: 17 )