Abstract
Phase-shifted Bragg grating waveguides (PSBGWs) were formed in bulk fused silica glass by femtosecond laser direct writing to produce narrowband filters at 1550 nm. Tunable 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 is inferred from the polarization-induced spectral shifting of the PSBGW narrowband filters.
©2012 Optical Society of America
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