Quadrature fiber-optic interferometer matrix

Details Quadrature fiber-optic interferometer matrix Quadrature fiber-optic interferometer matrix

1983-06-28

1985-04-30

Lee, John

Optics: measuring and testing

Range or remote distance finding

With photodetection

350 9629, 356345, G02B 5172, G01B 902

Patent

active

045140545

ABSTRACT:
An optical interferometer matrix is described which includes a reference waveguide for optically transmitting a reference signal. The optical interferometer matrix further includes a signal source waveguide for optically transmitting a source signal which has been modulated with respect to the reference signal in response to an applied physical effect. The physical effect may be, for example, thermal, acoustic, hydrodynamic, electrical, electromechanical or magnetic. The reference and signal waveguides are then optically coupled to one another at two different points so that interference between the light in the waveguides occurs under two different phase conditions, with a phase difference between these conditions which approaches .pi./2 radians. In the preferred embodiment, the two points of optical coupling are confined in a small space so that thermal- or pressure-induced differential phase changes of light between the first and second coupling points are negligible.

REFERENCES:
patent: 4136929 (1979-01-01), Suzaki
patent: 4302071 (1981-11-01), Winzer
patent: 4418981 (1983-12-01), Stowe
patent: 4444458 (1984-04-01), Stowe et al.

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