The temporal coherence effect of a light source on a fiber-optic Fabry-Perot interferometer is described. The ratio of the end-mirror separation h to the coherence length Lc of a single-frequency laser source gives an important parameter to specify the transmission characteristics of the interferometer. A criterion to determine the largest permissible mirror separation, hc, is discussed and given by hc = (0.1/2π) Lc. The peak transmission and finesse are heavily dependent on the ratio h/Lc. The sensing sensitivity is also discussed in association with the ratio h/Lc.
© 1982 Optical Society of America
Original Manuscript: June 23, 1982
Published: December 1, 1982
Yoshihiro Ohtsuka, "Optical coherence effects on a fiber-sensing Fabry-Perot interferometer," Appl. Opt. 21, 4316-4320 (1982)