Title :
Effectively nonreciprocal evanescent-wave optical-fibre directional coupler
Author :
Whalen, M.S. ; Wood, T.H.
Author_Institution :
AT&T Bell Laboratories, Crawford Hill Laboratory, Holmdel, USA
Abstract :
An effectively nonreciprocal directional coupler has been demonstrated using evanescent coupling between a single-mode and a multimode optical fibre. At least 17 dB difference in coupling efficiency between transmit and receive branches has been measured. The near-field mode patterns show coupling between the single-mode fibre and a few high-order modes of the multimode fibre.
Keywords :
optical couplers; optical fibres; coupling efficiency; evanescent coupling; multimode optical fibre; near-field mode patterns; nonreciprocal directional coupler; single-mode fibre;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19850123
