A novel compact optical variable-attenuator with a wide dynamic range for use in single-mode fiber transmission systems has been developed. Attenuation rate can be continuously adjusted by changing the distance between the end faces of the two fibers in the V-channel on a concave surface. The calculated insertion loss is <0.5 dB; the dynamic range of 30 dB is attained by <2.5 mm end separation. The calculated losses were verified experimentally. Reproducibility of the attenuation is within 0.5 dB.
© 1980 Optical Society of America
S. Masuda, "Variable attenuator for use in single-mode fiber transmission systems," Appl. Opt. 19, 2435-2438 (1980)