Fiber optical time-division-multiplexed unbalanced pulsed interf

Details Fiber optical time-division-multiplexed unbalanced pulsed interf Fiber optical time-division-multiplexed unbalanced pulsed interf

1991-05-28

1992-12-22

Turner, Samuel A.

Optics: measuring and testing

By particle light scattering

With photocell detection

25022719, 25022727, G01B 902

Patent

active

051737434

ABSTRACT:
Apparatus and methods for reducing and preventing polarization fading in unbalanced measuring interferometers. An extended interferometer having a plurality of sensors and a compensating interferometer are used. They are driven from a pulsed optical signal source wherein the optical signal comprises sequences of two pulses each. To prevent polarization fading the polarization of a predetermined one of each two-pulse sequence is switched, preferably orthogonally, from sequence to sequence. Interference pulse output groups are produced for each two-pulse driving sequence. Each output group has the same number of usable pulses as the number of sensors in the interferometer.

REFERENCES:
patent: 4632551 (1986-12-01), Pavlath
patent: 4697926 (1987-10-01), Youngquist et al.
patent: 4699513 (1987-10-01), Brooks et al.
patent: 4770535 (1988-09-01), Kim et al.
patent: 4932783 (1990-06-01), Kersey et al.

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