Femtosecond laser fabrication of phase-shifted Bragg grating waveguides in fused silica |
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| Authors: | Grenier Jason R Fernandes Luís A Aitchison J Stewart Marques Paulo V S Herman Peter R |
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| Affiliation: | Institute for Optical Sciences and the Department of Electrical and Computer Engineering, University of Toronto, 10 King’s College Road, Toronto, Ontario M5S 3G4, Canada. j.grenier@utoronto.ca |
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| Abstract: | Phase-shifted Bragg grating waveguides (PSBGWs) were formed in bulk fused silica glass by femtosecond laser direct writing to produce narrowband (22±3) pm filters at 1550 nm. Tunable π and other phase shifts generated narrow passbands in controlled positions of the Bragg stopband, while the accurate placement of multiple cascaded phase-shift regions yielded a rectangular-shaped bandpass filter. A waveguide birefringence of (7.5±0.3)×10(-5) is inferred from the polarization-induced spectral shifting of the PSBGW narrowband filters. |
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