Abstract
We describe a continuously tunable reflection filter for the 1.2–1.6-μm wavelength range. The filter is a volume-reflection hologram in dichromated gelatin and exhibits high reflection efficiencies (∼95%) with narrow spectral bandwidth (∼1% FWHM). These filters have been initially designed for use as position-tuned wavelength demultiplexers or channel-selection switches in multichannel optical-fiber systems. A prototype device has been constructed with an insertion loss between input and output single-mode fibers of <3 dB, with bandwidths Δλ1/2(FWHM) ∼ 1% over the wavelength band.
© 1985 Optical Society of America
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