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The fading of the signal amplitude of an unbalanced interference syste
m in response to changes in the emission spectrum of the optical sourc
e is investigated. The condition for stability of the signal amplitude
of fiber-optic interferometers in systems with gas lasers that are no
t frequency-stabilized is found. (C) 1997 American Institute of Physic
s. [S1063-7850(97)02810-3].