Polarization-independent optical isolator in a Sagnac-type configuration

We propose a polarization-independent optical isolator that does not use walk-off between the two orthogonal polarizations. The design is based on two Faraday rotators in combination with two half-wave plates in a closed, Sagnac-interferometer-like configuration. An experimental prototype is tested...

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Bibliographic Details
Published in:Applied optics (2004) 2021-05, Vol.60 (14), p.4230-4234
Main Authors: Al-Mahmoud, Mouhamad, Dimova, Emiliya, Hristova, Hristina, Coda, Virginie, Rangelov, Andon A, Montemezzani, Germano
Format: Article
Language:English
Subjects:
Configurations
Optics
Physics
Polarization
Wave plates
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Summary:We propose a polarization-independent optical isolator that does not use walk-off between the two orthogonal polarizations. The design is based on two Faraday rotators in combination with two half-wave plates in a closed, Sagnac-interferometer-like configuration. An experimental prototype is tested successfully under variation of the input light polarization state with isolation level between 43 dB and 50 dB for all input polarizations (linear, circular, or elliptical).
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.423730