Abstract

There is considerable interest in the use of optical fibres as sensors⁽¹⁾, in which the propagation of light in the fibre is perturbed by some external influence. A homodyne interferometer is often used to convert a velocity perturbation into an intensity change. However, there are considerable advantages in using heterodyne techniques to translate the phase change to some intermediate frequency, including a greater sensitivity and the prospect of a digital output⁽²⁾.

© 1982 Optical Society of America