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Helical-grating two-mode fiber spatial-mode coupler

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3 Author(s)
C. D. Poole ; AT&T Bell Lab., Homdel, NJ, USA ; C. D. Townsend ; K. T. Nelson

The authors investigate a helical-grating geometry for coupling the spatial modes in a two-mode fiber. The feasibility of making fiber grating filters based on this geometry is investigated. By adding mode strippers at the input and output of a helical-grating spatial-mode coupler, an optical notch filter is demonstrated with 0.3-dB waveguide loss, 24-dB extinction, and 24-nm spectral width. The effect of small ellipticity in the fiber core is also investigated, and it is shown that polarization-insensitive coupling can be achieved in a fiber with a sufficiently circular core

Published in:

Journal of Lightwave Technology  (Volume:9 ,  Issue: 5 )