Optical Edge Filters Made of Single-Mode Fibers

Abstract

Optical edge filters with band edges specified between 1.1 μιη and Ι.όμιη were made of bent single-mode fibers in substrate blocks, polished down nearly to the fiber core and covered with immersion liquids. Theoretical and experimental investigations yielded insertion losses below l dB in the transmission bands and attenuations of more than 30 dB in the stop bands. The steepest increase of attenuation at the band edges was 0.6 dB/nm.

Linear and nonlinear optical fibre devices

“…A first device consists of a slightly curved singlemode fibre glued in a substrate block provided with a narrow groove [57]. The bottom of the groove was given a specified curvature, which shaped the axis of the fibre.…”