Abstract

The coupling of Rayleigh backscatter induced phase noise in bi-directional, inline fiber interferometers compromises detection sensitivity for Fourier frequencies less than 1 Hz. Here we report experimental and theoretical work highlighting the coupling of backscatter phase noise, and its subsequent range-gating and suppression using digitally enhanced homodyne interferometry. Between two in-line fiber interferometers, each with a differential arm-length of 8 km, we demonstrate a relative stability of 10 Hz/ $\sqrt{\text{Hz}}$ at a Fourier frequency of 100 mHz.

Double Rayleigh scattering in a digitally enhanced, all-fiber optical frequency reference

Ya Zhang, Chathura P. Bandutunga, Terry G. McRae, Malcolm B. Gray, and Jong H. Chow
Opt. Express 29(17) 26319-26331 (2021)

Suppressing Rayleigh backscatter and code noise from all-fiber digital interferometers

Silvie Ngo, Daniel A. Shaddock, Terry G. McRae, Timothy T-Y. Lam, Jong H. Chow, and Malcolm B. Gray
Opt. Lett. 41(1) 84-87 (2016)

Calculation of Rayleigh backscattering noise in fiber-optic gyroscopes

Kazumasa Takada
J. Opt. Soc. Am. A 2(6) 872-877 (1985)

Algebraic cancellation of polarisation noise in fibre interferometers

Terry G. McRae, Silvie Ngo, Timothy T-Y. Lam, David. E. McClelland, Jong H. Chow, Daniel A. Shaddock, and Malcolm B. Gray
Opt. Express 24(10) 10486-10494 (2016)

Digitally enhanced homodyne interferometry

Andrew J. Sutton, Oliver Gerberding, Gerhard Heinzel, and Daniel A. Shaddock
Opt. Express 20(20) 22195-22207 (2012)