Multimode acousto-optic switch and dead zone correction method

Details Multimode acousto-optic switch and dead zone correction method Multimode acousto-optic switch and dead zone correction method

1990-01-11

1991-09-10

LaRoche, Eugene R.

Optical: systems and elements

Optical modulator

Light wave directional modulation

356 731, G01N 2100, G02F 111, G02F 133

Patent

active

050468324

ABSTRACT:
An acousto-optic modulator for use in an optical time domain reflectometer to test multimode optical fibers has an active material, such as As-Se-Ge or As.sub.2 S.sub.3 glass, that has a high figure of merit with a low insertion loss. The transducer for the modulator is configured to have a height that encompasses the multimode beam diameter at the optical wavelength, and a length that is consistent with a theoretical lower limit that is a function of the acoustic and optical wavelengths. Sufficient RF power is applied to the modulator to produce an angular efficiency, or optical throughput, that is sufficient to meet the specifications for the optical time domain reflectometer. Further dead zone correction for the optical time domain reflectometer is obtained by deriving a transient response signal for the optical time domain reflectometer as a function of a measured output electrical signal in response to a known input optical signal, and subtracting the transient response signal from an output electrical signal obtained in response to an unknown input optical signal to derive a corrected measured output electrical signal.

REFERENCES:
"An Acoustooptical Directional Coupler for an Optical Time-Domain Reflectometer", Tsuneo Horiguchi, et al., Journal of Lightwave Technology, vol. LT-2, No. 2, Apr. 1984.
"Acoustooptical Pulse Modulators", Dan Maydan, IEE Journal of Quantum Electronics, vol. QE-6, No. 1, Jan. 1970.
"Acousto-Optics Device Development/Instrumentation/Applications" , J. A. Lucero, et al, The Society of Photo-Optical Instrumentation Engineers, vol. 90, 1976.
"Design Considerations for Acousto-Optic Devices", Eddie H. Young, Jr., et al, Proceedings of the IEEE, vol. 69, No. 1, Jan. 1981.

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