Abstract
We present a narrow-bandwidth interference filter in an optical monomode channel waveguide operating in the infrared wavelength region around . The filter consists of a thermally fixed refractive-index Bragg grating recorded with visible green light by use of a holographic technique. In a first approach we measure a reflectivity for the infrared light of 60% and a linewidth (FWHM) of 0.11 nm.
© 1998 Optical Society of America
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