A broadband fiber-optic nonlinear interferometer

Nonlinear strain response of two-mode fiber-optic interferometer.

Experimental and theoretical investigation of a nonlinear response of a two-mode fiber interferometer to axial strain is described. It is discovered that the nonlinearity dramatically increases as the wavelength approaches the cutoff wavelength of the second-order mode (LP(11)).

Extrinsic Fabry-Perot interferometer fiber-optic microphone

In this paper we describe a new fiber-optic microphone developed as a passive acoustic sensor for traffic monitoring and vehicle classification. It is based on a fiber-optic extrinsic Fabry–Perot (FP) microinterferometer coupled to an external membrane for modulating the FP cavity length and a low coherent superluminescent diode as light source. The frequency characteristic as compared with a s...

Nonlinearity in a fiber-optic coupled heterodyne interferometer

A high-accuracy (nonlinearity < 2nm) fiber-optic coupled displacement heterodyne measuring Michelson interferometer is developed. The primary limitation of accuracy encountered with this fiber-optic coupled heterodyne interferometer is the optical mixing arising from the imperfection of fiber-optic coupling system. The optical mixing results in the nonlinearity (first order and second order err...

Optical mixing errors in a fiber-optic coupled heterodyne interferometer

A lightweight and electrically passive interferometer is demanded by a number of applications for precision metrology such as machine tool metrology and on-machine feedback [1]. To satisfy these requirements, a fiber-optic coupled heterodyne displacement measuring Michelson interferometer (FIDMI) shown in Fig.1 has been developed in the Center of Precision Metrology (CPM) at the University of N...

Fiber Optic and Free Space Michelson Interferometer — Principle and Practice