By using a dual-frequency laser as the source of a fiber gyro, we show how to measure the inertial phase—shift with high linearity, and its sign, without the need for modulators. Our source is a He-Ne Zeeman Laser which supplies two orthogonally polarized modes having a stable frequency difference. In the fiber, the modes are injected with the same polarization. Sensitivity in 12 μrad/s for a 1 Km fiber at 1 KHz bandwidth, and baseline drift is 5 μrad/s in 1-hour period.
REFERENCES
1.
W.W.
Chow
, J.R.
Hambenne
, T.J.
Hutchings
, V.E.
Sanders
, M.
Sargent
III, M.O.
Scully
(sept
1980
): “Multioscillator Laser Gyros
”, JQE
, QE16-9
, 918
–935
.2.
V.
Vali
and R.W.
Shorthill
(May
1976
): “Fiber-Ring Interferometer
”, Appl. Opt.
15-5
, 1099
–1100
.3.
V.
Vali
, R.W.
Shorthill
, M.F.
Berg
(Oct
1977
): “Fresnel-Fizeau Effect in a Rotating Fiber Ring Interferometer
”, Appl. Opt.
16-10
, 2605
–2607
.4.
G.A.
Pavloth
, M.J.
Shaw
(May
1982
): “Birefringence and Polarization Effects in Fiber Gyro scopes
”, Appl. Opt.
21-10
, 1752
–1757
.5.
S.C.
Rashleigh
and W.K.
Burns
(May
1980
): “Dual Input Fiber-Optic Gyroscope
”, Opt. Lett.
5-11
, 482
–484
.6.
R.
Ulrich
(May
1980
): “Fiber-optic Rotation Sensing with Low Drift
”, Opt. Lett.
5-5
, 173
–175
.7.
R.A.
Berg
, M.C.
Lefevre
, M.J.
Shaw
(Oct
1981
): “All-single-mode Fiber-optic Gyroscope with Long Term Stability
”, Opt. Lett.
6-10
, 502
–504
.8.
J.L.
Davis
, S.
Ezekiel
(Oct
1981
): “Closed-loop, Low-noise Fiber-optic Rotation Sensor
”, Opt. Lett.
6-10
, 505
–507
.9.
K.
Rotate
, Y.
Yoshida
, M.
Higoshiguchi
, N.
Niwa
(Dec
1981
): “Fiber-optic Gyro with Easily Introduced Phase-difference Bias
”, Appl. Opt.
20-24
, 4313
–4318
.10.
R.
Ulrich
and M.
Johnson
(May
1979
): “Fiber-ring Interferometer: Polarization Analysis
”, Opt. Lett.
4-5
, 152
–154
.11.
S.
Donati
(Feb
1978
): “Laser Interferometry by Induced Modulation of Cavity Field
”, J. Appl. Phys.
49
, 496
–498
.12.
H.G.
Unger
(1977
): Planar Optical Waveguides and Fibres
, Clarendon Press
, Oxford
, 177
.13.
D.
Glodge
(Oct
1971
): “Weakly Guiding Fibres
”, Appl. Opt.
10-10
, 2252
–2258
.14.
G.
Schiffner
, W.R.
Leeb
, H.
Krammer
, J.
Wittman
(Feb
1979
): “Reciprocity of Birefringent Single-mode Fibers for Optical Gyros
”, Appl. Opt.
18-13
, 2096
–2097
.15.
V.
Annovazzi-Lodi
, S.
Donati
(Aug
1980
): “Injection Modulation in Coupled Laser Oscillators
”, JQE
, QE16-8
, 859
–864
.16.
M.O.
Scully
, V.
Sanders
, M.
Sargent
III (Feb
1978
): “Novel Multioscillator Approach to the Problem of Locking in Two-mode Ring Laser Gyros
”, Opt. Lett.
3-2
, 43
–45
.
This content is only available via PDF.
© 1982 Laser Institute of America.
1982
Laser Institute of America
You do not currently have access to this content.