Abstract

We propose the fabrication of an in-line-type optical attenuator with high performance by thermally replicating carbon-dispersed polymethyl methacrylate film at the end of plastic optical fiber. When carbon with a particle size of 50 nm is employed, the dependency of the attenuation on the mode of excitation is within ±10% even for variations in FWHM of incident modal width in the range of 10° to 50°. For the dependency of the attenuation on the wavelength, the value was also within ±10% for variations of wavelength from 400 to 900 nm.

© 1991 Optical Society of America

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