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Novel optical isolator consisting of a YIG spherical lens and PANDA-fibre polarisers

Novel optical isolator consisting of a YIG spherical lens and PANDA-fibre polarisers

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© The Institution of Electrical Engineers
Published

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 μm wavelength with the insertion loss of 4.1 dB through the PANDA-fibre polariser to the analyser.

Inspec keywords: optical fibres; optical waveguide components; optical polarisers; optical isolators; lenses; magneto-optical devices

Other keywords: optical isolator; YIG spherical lens; PANDA-fibre polarisers; extinction ratio; coupling lens; insertion loss; Faraday rotator; isolation ratio

Subjects: Magneto-optical devices; Fibre optics; Fibre optics and fibre waveguides; Performance and testing of optical systems

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