Abstract

A Mach–Zehnder fiber-optic sensor circuit incorporating an optical compensation circuit to reduce errors from common-mode perturbations and electro-optic feedback to enhance measurand sensitivity is proposed and demonstrated. Experimental results show that the phase bias and the feedback constant can be adjusted to yield an operating region with negligible sensitivity to common-mode perturbations and a measurand sensitivity an order of magnitude above that expected from an equivalent conventional Mach–Zehnder sensor, in good agreement with theory.

© 1989 Optical Society of America

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References

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  1. A. B. Buckman, IEEE J. Lightwave Technol. LT-7, 151 (1989).
    [CrossRef]
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    [CrossRef]

1989

A. B. Buckman, IEEE J. Lightwave Technol. LT-7, 151 (1989).
[CrossRef]

1984

1982

1980

H. C. Lefevre, Electron. Lett. 16, 778 (1980).
[CrossRef]

Electron. Lett.

H. C. Lefevre, Electron. Lett. 16, 778 (1980).
[CrossRef]

IEEE J. Lightwave Technol.

A. B. Buckman, IEEE J. Lightwave Technol. LT-7, 151 (1989).
[CrossRef]

Opt. Lett.

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Figures (4)

Fig. 1
Fig. 1

(a) Enhanced, common-mode-compensated fiberoptic Mach–Zehnder sensor, (b) Schematic of the optical circuit for the enhanced sensor.

Fig. 2
Fig. 2

Numerical solutions for the transmittance T versus p for ϕ = −π/2 and the indicated values of k. The maximum transmittance does not reach unity because coupler and splice losses are included in the equation solved to obtain these curves.

Fig. 3
Fig. 3

Numerical simulation of a sweep of p through 2π rad while the source wavelength oscillates about an average value. For the phase biases p1 and p2, small variations in source wavelength have no effect on the transmittance.

Fig. 4
Fig. 4

Oscilloscope trace of the filtered sensor output versus time, with V1 and the amplifier gain set to obtain high measurand sensitivity in a region with common-mode compensation (region A). V2 is a linear ramp function. The horizontal bar above the curve represents the.time to sweep p through 2π rad.

Equations (6)

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Φ = k 0 n ¯ [ L 1 ( V 1 ) L 2 ] = 2 + ϕ ( V 1 ) ,
P = k 0 n ¯ [ L s ( V 2 , T ) L r ] = 2 + p ( V 2 , T ) ,
T = 1 2 ( 1 + sin ϕ sin p ) ,
p = p b + kT + δ p m .
s m = | T p m | ,
f cm ( ϕ , p ) = Φ T ϕ + P T p = 0 .

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