Title :
Novel optical isolator consisting of a YIG spherical lens and PANDA-fibre polarisers
Author :
Okamoto, K. ; Miyazawa, H. ; Noda, J. ; Saruwatari, M.
Author_Institution :
NTT Ibaraki Electrical Communication Laboratory, Tokai, Japan
Abstract :
A novel optical isolator consisting of an yttrium-iron-garnet (YIG) sphere and two PANDA-fibre polarisers is reported. The YIG sphere functions not only as a Faraday rotator but also as an efficient coupling lens. The extinction ratio of the PANDA-fibre polariser was 37 dB when the 3 m-long fibre was coiled by the diameter D = 21 cm. The isolation ratio was 34.7 dB at 1.3 ¿m wavelength with the insertion loss of 4.1 dB through the PANDA-fibre polariser to the analyser.
Keywords :
lenses; magneto-optical devices; optical fibres; optical isolators; optical polarisers; optical waveguide components; Faraday rotator; PANDA-fibre polarisers; YIG spherical lens; coupling lens; extinction ratio; insertion loss; isolation ratio; optical isolator;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19850028
