Open AccessStabilization of a long-armed fiber-optic single-photon interferometer
Author(s) -
Seok-Beom Cho,
Tae-Gon Noh
Publication year - 2009
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.17.019027
Subject(s) - interferometry , optics , michelson interferometer , interference (communication) , physics , optical fiber , astronomical interferometer , photon , wavelength , interferometric visibility , multiplexing , optical path length , telecommunications , channel (broadcasting) , computer science
We report on single-photon interference experiments in a Michelson-type interferometer built with two 6-km-long fiber spools, as well as on the active stabilization of the interferometer. A weak coherent light signal was (de-) multiplexed with a strong reference light using wavelength-division multiplexing technique, and real-time feedback control technique was applied for the reference light to actively stabilize the phase fluctuation in the long-armed fiber interferometer. The stabilized interferometer showed phase stability of 0.06 rad, which corresponds to an optical path length fluctuation of 15 nm between the 6-km-long interfering arms. The raw visibility obtained without subtracting noise counts in the single-photon interference experiment was more than 98% for stabilized conditions.