Longitudinal spatial characterisation of optical fibre erbium distributed feedback laser under the motion of steady magnetic field

Yuan Yao; Gordon M. H. Flockhart

doi:10.1117/12.2059679

2 June 2014 Longitudinal spatial characterisation of optical fibre erbium distributed feedback laser under the motion of steady magnetic field

Yuan Yao, Gordon M. H. Flockhart

Author Affiliations +

Proceedings Volume 9157, 23rd International Conference on Optical Fibre Sensors; 91571T (2014) https://doi.org/10.1117/12.2059679
Event: OFS2014 23rd International Conference on Optical Fiber Sensors, 2014, Santander, Spain

Abstract

The spatial sensitivity of an erbium doped optical fibre distributed feedback (DFB) laser to an external magnetic field is reported. Intrinsic birefringence of the laser cavity allows lasing in two orthogonal modes. The polarisation beat frequency between these modes is sensitive to magnetic fields aligned along the axis of the optical fibre due to the Faraday effect. The interaction of magnetic field, generated by a permanent magnet, with the spatial mode profile of the laser is investigated. Experimental measurements show a 3.82 MHz change in the beat frequency when a permanent magnet is scanned along the fibre laser.

Citation Download Citation

Yuan Yao and Gordon M. H. Flockhart "Longitudinal spatial characterisation of optical fibre erbium distributed feedback laser under the motion of steady magnetic field", Proc. SPIE 9157, 23rd International Conference on Optical Fibre Sensors, 91571T (2 June 2014); https://doi.org/10.1117/12.2059679

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