Low noise fiber gyroscope system which includes excess noise sub

Details Low noise fiber gyroscope system which includes excess noise sub Low noise fiber gyroscope system which includes excess noise sub

1992-11-30

1994-07-19

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1972

Patent

active

053314042

ABSTRACT:
A system and method for subtracting excess noise from a high sensitivity gyroscope system in which a laser diode array is focused into an Nd-doped active fiber. A resultant gyro signal is polarized, detected, and amplified. A noise signal is polarized, delayed, detected, and amplified such that the noise signal is polarized parallel to the gyro signal and delayed by a fiber delay, of a length equal to a length of a gyroscope fiber coil. The excess noise component in the amplified gyro signal is reduced by modulating the amplified noise signal with a portion of the amplified gyro signal and subtracting the amplitude-modulated noise signal from the amplified gyro signal to produce a reduced noise gyro signal.

REFERENCES:
Fiber Laser Sources and Amplifiers, Fesler et al, SPIE, Sep. 1989, pp. 3452.
Liu, 10 mw Superfluorescent Electron. Lett. 23, 1320 (1987).
Duling, High-Power Superfluorescent Fiber Source Opt. Lett. 15,33 (1990).
Liu, Superfluorescent Single Mode Nd:Fiber Source at 1060 nm, in Digest of Conference on Optical Fiber Sensors (Optical Society of America, Washington, D.C., 1988), paper FDD5.
Po, Double Clad High Brightness Nd Fiber Laser Pumped by GaAlAs Phased Array, Digest of Conference on Optical Fiber Communication (Optical Society of America, Washington, D.C., 1989), paper PD7.
Fesler, Stable Fiber-Source Gyroscope, Opt. Lett. 15, 1321 (1990).
Burns, Excess Noise in Fiber Gyroscope Sources, IEEE Photon Technol. Lett 2,606 (1990).
Yurek, Quantum Noise in Superluminescent Diodes, IEEE J. Quantum Electron. QE-22, 522 (1986).

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