Coupling characteristics of photo-induced Bragg gratings in depressed- and matched-cladding fibre |
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Authors: | S. J. Hewlett J. D. Love G. Meltz T. J. Bailey W. W. Morey |
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Affiliation: | (1) Department of Physics, Trinity College, University of Dublin, Dublin 2, Ireland;(2) Optical Sciences Centre, Institute of Advanced Studies, The Australian National University, 0200 Canberra, ACT, Australia;(3) OFT Associates, 77 Daventry Hill Road, 06001 Avon, CT, USA;(4) United Technologies Research Center, 411 Silver Lane, 06108 East Hartford, CT, USA;(5) 3M Bragg Grating Technologies, 206 West Newberry Road, 06002 Bloomfield, CT, USA |
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Abstract: | Experimental transmission spectra of ultraviolet (u.v.)-written Bragg gratings in depressed- and matched-cladding fibre are characterized and compared. In particular, we discuss how the location and strength of the spectral features vary with the degree of blazing, or angular tilt of the grating. The fine-structure detail on the short-wavelength side of the fundamental Bragg line is attributed to power coupling between the forwardpropagating fundamental (LP01) mode and discrete, backward-propagating cladding modes. Resonances corresponding to backward-propagating LP0n and LP1n modes are identified, and their relative strengths are compared with theoretical overlap calculations. Physical arguments are presented that explain the pronounced ghost-grating notch that appears in the transmission spectra of blazed, fibre Bragg gratings in depressed-cladding fibre. |
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