Abstract

A new type of tunable narrowband filter is proposed. This filter is a combination of a Fabry–Perot etalon, which permits the selection of a comb of discrete narrow bands, and a high-efficiency rotating volume Bragg grating recorded in photo-thermo-refractive glass, which permits tuning between the Fabry–Perot resonances. A tunable filter for fixed wavelengths in the region of 1.5μm with a spectral width of 220pm (FWHM), separation between channels of 800pm, and throughput of 95% (losses <0.2dB) is demonstrated.

© 2006 Optical Society of America

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