Accuracy of optical frequency comb generation in optical fiber

We evaluated the accuracy of an optical frequency comb in optical fibers by measuring the frequency shift after a sideband from an electro-optic modul ator had passed through the fiber. We found that a frequency drift of a few hertz was due largely to a variation in the ambient temperature that corre sponded to an increase in the square root of the Allan variance to 0.66 Hz. (C) 1999 Optical Society of America OCIS codes: 120.3930, 120.5050, 060.43 70, 230.4110.