Abstract

A new intensity-noise-subtraction scheme for an interferometric fiber-optic gyroscope is demonstrated. Together with the light circulating through the gyro coil, an appropriately attenuated light beam from the source coupler dead end of the gyro is directed to the gyro photodetector. When the gyro is unmodulated, or modulated with a square wave at the proper frequency, the intensity noises of the two beams bear opposite phases and interfere destructively on the detector. For an unmodulated gyro, we demonstrate an intensity noise-reduction factor of 35, and for the same gyro modulated with a square wave at the proper frequency, we demonstrate a reduction factor of 15.

© 2000 Optical Society of America

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References

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  1. R. Moeller and W. Burns, Opt. Lett. 16, 1902 (1991).
    [CrossRef] [PubMed]
  2. K. Killian, M. Burmenko, and W. Hollinger, Proc. SPIE 2292, 255 (1994).
    [CrossRef]
  3. O. Laznicka, L. Freier, J. Gilmore, and M. Fontanella, Proc. SPIE 2292, 177 (1994).
    [CrossRef]
  4. G. Sanders, B. Szafraniec, R.-Y. Liu, M. Bielas, and L. Strandjord, Proc. SPIE 2510, 2 (1995).
    [CrossRef]

1995

G. Sanders, B. Szafraniec, R.-Y. Liu, M. Bielas, and L. Strandjord, Proc. SPIE 2510, 2 (1995).
[CrossRef]

1994

K. Killian, M. Burmenko, and W. Hollinger, Proc. SPIE 2292, 255 (1994).
[CrossRef]

O. Laznicka, L. Freier, J. Gilmore, and M. Fontanella, Proc. SPIE 2292, 177 (1994).
[CrossRef]

1991

Bielas, M.

G. Sanders, B. Szafraniec, R.-Y. Liu, M. Bielas, and L. Strandjord, Proc. SPIE 2510, 2 (1995).
[CrossRef]

Burmenko, M.

K. Killian, M. Burmenko, and W. Hollinger, Proc. SPIE 2292, 255 (1994).
[CrossRef]

Burns, W.

Fontanella, M.

O. Laznicka, L. Freier, J. Gilmore, and M. Fontanella, Proc. SPIE 2292, 177 (1994).
[CrossRef]

Freier, L.

O. Laznicka, L. Freier, J. Gilmore, and M. Fontanella, Proc. SPIE 2292, 177 (1994).
[CrossRef]

Gilmore, J.

O. Laznicka, L. Freier, J. Gilmore, and M. Fontanella, Proc. SPIE 2292, 177 (1994).
[CrossRef]

Hollinger, W.

K. Killian, M. Burmenko, and W. Hollinger, Proc. SPIE 2292, 255 (1994).
[CrossRef]

Killian, K.

K. Killian, M. Burmenko, and W. Hollinger, Proc. SPIE 2292, 255 (1994).
[CrossRef]

Laznicka, O.

O. Laznicka, L. Freier, J. Gilmore, and M. Fontanella, Proc. SPIE 2292, 177 (1994).
[CrossRef]

Liu, R.-Y.

G. Sanders, B. Szafraniec, R.-Y. Liu, M. Bielas, and L. Strandjord, Proc. SPIE 2510, 2 (1995).
[CrossRef]

Moeller, R.

Sanders, G.

G. Sanders, B. Szafraniec, R.-Y. Liu, M. Bielas, and L. Strandjord, Proc. SPIE 2510, 2 (1995).
[CrossRef]

Strandjord, L.

G. Sanders, B. Szafraniec, R.-Y. Liu, M. Bielas, and L. Strandjord, Proc. SPIE 2510, 2 (1995).
[CrossRef]

Szafraniec, B.

G. Sanders, B. Szafraniec, R.-Y. Liu, M. Bielas, and L. Strandjord, Proc. SPIE 2510, 2 (1995).
[CrossRef]

Opt. Lett.

Proc. SPIE

K. Killian, M. Burmenko, and W. Hollinger, Proc. SPIE 2292, 255 (1994).
[CrossRef]

Proc. SPIE

O. Laznicka, L. Freier, J. Gilmore, and M. Fontanella, Proc. SPIE 2292, 177 (1994).
[CrossRef]

G. Sanders, B. Szafraniec, R.-Y. Liu, M. Bielas, and L. Strandjord, Proc. SPIE 2510, 2 (1995).
[CrossRef]

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Figures (3)

Fig. 1
Fig. 1

Experimental setup.

Fig. 2
Fig. 2

Measurement of noise at the proper frequency (665 kHz) with an unmodulated gyro under different conditions: 1, main gyro beam on, dead-end beam blocked; 2, dead-end beam on, main beam blocked; 3, both beams on; 4, both beams on, noise source off; 5, main beam on, dead-end beam off, noise source off; 6, both beams blocked (dark detector). The intensity noise is reduced by a factor of 35.

Fig. 3
Fig. 3

Measurement of noise at the proper frequency (665 kHz) with a gyro modulated with a square wave at 665 kHz under different conditions: 1, main gyro beam on, dead-end beam blocked; 2, dead-end beam on, main beam blocked; 3, both beams on; 4, both beams on, noise source off; 5, main beam on, dead-end beam off, noise source off; 6, both beams blocked (dark detector). The intensity noise is reduced by factor of 15.

Equations (14)

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It=I0+INt,
I1t=α1I0+INt-T×Re1+expjΔΦs+mft-ft-T,
I2t=α2I0+INt,
ItI1t+I2t=I~1t+I~2t,
I~1=α1+α2I0+α1I0 cosΔΦs+mft-ft-T
I~2t=α1INt-T×Re1+expj{ΔΦs+m[ft-ft-T}+α2INt.
I~2ωp=α1 exp-πjINωp+α2INωp.
I~2ωp=α1 exp-πjINωp×Re1+expjmfmax-fmin+α2INωp.
α2=α1 Re1+expjmfmax-fmin,
RMSmain=RMS12-RMS521/2,
RMSboth=RMS32-RMS421/2,
R=RMSmain/RMSboth.
R135.
R215.

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