Effective suppression of residual coherent phase error in a dual-polarization fiber optic gyroscope

Rongya Luo; Yulin Li; Sheng Deng; Chao Peng; Zhengbin Li

doi:10.1364/OL.43.000815

Optics Letters
Vol. 43,
Issue 4,
pp. 815-818
(2018)
•https://doi.org/10.1364/OL.43.000815

Effective suppression of residual coherent phase error in a dual-polarization fiber optic gyroscope

Rongya Luo, Yulin Li, Sheng Deng, Chao Peng, and Zhengbin Li

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Rongya Luo, Yulin Li, Sheng Deng, Chao Peng, and Zhengbin Li, "Effective suppression of residual coherent phase error in a dual-polarization fiber optic gyroscope," Opt. Lett. 43, 815-818 (2018)

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Table of Contents Category
- Fiber Optics and Optical Communications
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About this Article
History
- Original Manuscript: November 17, 2017
- Revised Manuscript: January 2, 2018
- Manuscript Accepted: January 9, 2018
- Published: February 9, 2018

Abstract

The impact of residual coherent phase error in a dual-polarization interferometric fiber optic gyroscope (IFOG) is investigated. Although it has been intuitively assumed that the coherence of a light source can be eliminated by a sufficient long fiber delay, the experiment and theory indicate that it still contributes a remarkable portion to long-term instability. After the residual coherent phase error is well handled, we demonstrate a dual-polarization IFOG with bias instability of $3.56 \times 10^{- 4} ° / h$ . Comparisons show that such performance is even better than the conventional “minimal scheme” that operates on one polarization.

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Device	Parameters	Value (dB)
MIOC 1, 2	$ϵ_{11 x}^{2}$ , $ϵ_{12 x}^{2}$ , $ϵ_{21 y}^{2}$ , $ϵ_{22 y}^{2}$	−35, −37, −40, −38
PBS/C A, B	$ϵ_{A x}^{2}$ , $ϵ_{A y}^{2}$ , $ϵ_{B x}^{2}$ , $ϵ_{B y}^{2}$	−24, −27, −26, −28
PM fiber coil	$κ$	−17

	$ARW (° / \sqrt{h})$	BI(°/h)
1 m	$1.40 \times 10^{- 3}$	$3.62 \times 10^{- 3}$
10 m	$5.78 \times 10^{- 4}$	$1.04 \times 10^{- 3}$
150 m	$5.98 \times 10^{- 4}$	$5.55 \times 10^{- 4}$
3000 m	$5.36 \times 10^{- 4}$	$5.53 \times 10^{- 4}$
1 polarization	$5.70 \times 10^{- 4}$	$5.28 \times 10^{- 4}$
2 light source	$4.30 \times 10^{- 4}$	$3.56 \times 10^{- 4}$

$E_{PD 1}$	$E_{PD 2}$
$K_{1 x} = η_{12 x} η_{21 y} η_{A y} η_{B x} \sqrt{κ}$	$K_{1 y} = η_{11 x} η_{22 y} η_{A x} η_{B y} \sqrt{κ}$
$K_{2 x} = η_{11 x} η_{22 y} η_{A x} η_{B y} \sqrt{κ}$	$K_{2 y} = η_{12 x} η_{21 y} η_{A y} η_{B x} \sqrt{κ}$
$K_{3 x} = η_{11 x} η_{12 x} η_{A x} η_{B x} \sqrt{1 - κ}$	$K_{3 y} = η_{21 y} η_{22 y} η_{A y} η_{B y} \sqrt{1 - κ}$

Device	Parameters	Value (dB)
MIOC 1, 2	$ϵ_{11 x}^{2}$ , $ϵ_{12 x}^{2}$ , $ϵ_{21 y}^{2}$ , $ϵ_{22 y}^{2}$	−35, −37, −40, −38
PBS/C A, B	$ϵ_{A x}^{2}$ , $ϵ_{A y}^{2}$ , $ϵ_{B x}^{2}$ , $ϵ_{B y}^{2}$	−24, −27, −26, −28
PM fiber coil	$κ$	−17

	$ARW (° / \sqrt{h})$	BI(°/h)
1 m	$1.40 \times 10^{- 3}$	$3.62 \times 10^{- 3}$
10 m	$5.78 \times 10^{- 4}$	$1.04 \times 10^{- 3}$
150 m	$5.98 \times 10^{- 4}$	$5.55 \times 10^{- 4}$
3000 m	$5.36 \times 10^{- 4}$	$5.53 \times 10^{- 4}$
1 polarization	$5.70 \times 10^{- 4}$	$5.28 \times 10^{- 4}$
2 light source	$4.30 \times 10^{- 4}$	$3.56 \times 10^{- 4}$

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Optics Letters