Title :
Feedback effects in erbium-doped fiber amplifier/source for open-loop fiber-optic gyroscope
Author :
Park, Hee Gap ; Lim, Kyoung Ah ; Chin, Young-Jun ; Kim, Byoung Yoon
Author_Institution :
Dept. of Phys., Chonbuk Nat. Univ., Chonju, South Korea
fDate :
8/1/1997 12:00:00 AM
Abstract :
We have investigated rotation-dependent feedback effects in an erbium-doped fiber source for an open-loop fiber-optic gyroscope with fiber amplifier/source configuration. Average power and optical spectrum of the source output as well as of the amplified signal output were found to vary depending on the rotation rate, resulting in the distortion of the gyroscope output. The distorted gyroscope output could be quantitatively explained by a theoretical model with the assumption that the source power and the gain variation due to feedback depends primarily on the average feedback signal power. It was found that the distortion in gyroscope output due to rotation-dependent feedback can be minimized when the phase difference is modulated with an amplitude of 2.405 rad where the average feedback signal power becomes independent of the rotation rate
Keywords :
erbium; fibre lasers; fibre optic sensors; gyroscopes; optical feedback; optical fibre theory; optical noise; amplified signal output; average feedback signal; average feedback signal power; average power; distorted gyroscope; erbium-doped fiber amplifier; feedback effects; gain variation; gyroscope output; open-loop fiber-optic gyroscope; optical spectrum; phase difference; rotation rate; rotation-dependent feedback; rotation-dependent feedback effects; Amplitude modulation; Erbium-doped fiber amplifier; Gyroscopes; Optical distortion; Optical feedback; Optical fiber amplifiers; Output feedback; Phase distortion; Phase modulation; Stimulated emission;
Journal_Title :
Lightwave Technology, Journal of
