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Femtosecond laser fabrication of phase-shifted Bragg grating waveguides in fused silica

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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)×105 is inferred from the polarization-induced spectral shifting of the PSBGW narrowband filters.

©2012 Optical Society of America

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