Delivering the same optical frequency at two places: accurate cancellation of phase noise introduced by an optical fiber or other time-varying path.

@article{Ma1994DeliveringTS,
  title={Delivering the same optical frequency at two places: accurate cancellation of phase noise introduced by an optical fiber or other time-varying path.},
  author={L. S. Ma and Peter Jungner and Jun Ye and J. L. Hall},
  journal={Optics letters},
  year={1994},
  volume={19 21},
  pages={
          1777-9
        }
}
Although a single-mode optical fiber is a convenient and efficient interface/connecting medium, it introduces phase-noise modulation, which corrupts high-precision frequency-based applications by broadening the spectrum toward the kilohertz domain. We describe a simple double-pass fiber noise measurement and control system, which is demonstrated to provide millihertz accuracy of noise cancellation. 
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