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Opt Express. 2013 Feb 25;21(4):4493-502. doi: 10.1364/OE.21.004493.

Femtosecond laser writing of optical edge filters in fused silica optical waveguides.

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1
Institute for Optical Sciences, and the Department of Electrical and Computer Engineering, University of Toronto, 10 Kings College Rd., Toronto, Ontario, M5S 3G4, Canada. j.grenier@utoronto.ca

Abstract

The positional alignment of femtosecond laser written Bragg grating waveguides within standard and coreless optical fiber has been exploited to vary symmetry and open strong optical coupling to a high density of asymmetric cladding modes. This coupling was further intensified with tight focusing of the laser pulses through an oil-immersion lens to control mode size against an asymmetric refractive index profile. By extending this Bragg grating waveguide writing into bulk fused silica glass, strong coupling to a continuum of radiation-like modes facilitated a significant broadening to over hundreds of nanometers bandwidth that blended into the narrow Bragg resonance to form into a strongly isolating (43 dB) optical edge filter. This Bragg resonance defined exceptionally steep edge slopes of 136 dB/nm and 185 dB/nm for unpolarized and linearly polarized light, respectively, that were tunable through the 1450 nm to 1550 nm telecommunication band.

PMID:
23481982
[Indexed for MEDLINE]
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