Influence of ghost coupling points on distributed polarization crosstalk measurements in high birefringence fiber and its solution

Dianyou Song; Zhiyong Wang; Xinwei Chen; Hongxia Zhang; Tiegen Liu

doi:10.1364/AO.54.001918

Applied Optics
Vol. 54,
Issue 8,
pp. 1918-1925
(2015)
•https://doi.org/10.1364/AO.54.001918

Influence of ghost coupling points on distributed polarization crosstalk measurements in high birefringence fiber and its solution

Dianyou Song, Zhiyong Wang, Xinwei Chen, Hongxia Zhang, and Tiegen Liu

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Dianyou Song, Zhiyong Wang, Xinwei Chen, Hongxia Zhang, and Tiegen Liu, "Influence of ghost coupling points on distributed polarization crosstalk measurements in high birefringence fiber and its solution," Appl. Opt. 54, 1918-1925 (2015)

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Abstract

Ghost coupling points in distributed polarization crosstalk measurements adopting a white light interferometric method are analyzed under the circumstances of anisotropy perturbation induced polarization crosstalk and principal axis misalignment induced polarization crosstalk in polarization-maintaining fiber. The relationship between the intensities of the ghost coupling points and the real crosstalk points, as well as the relationship between their positions, are theoretically analyzed and proved by experiment. A simple method has been developed to identify the ghost coupling points by using a rotatable half-wave plate to adjust the angle between the principal axis of the analyzer and the exciting mode propagating in the polarization-maintaining fiber. The experimental results have a good agreement with the theoretical results.

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	G2	G3	G1	P3	P4	P1
Measured position/m	1.077	1.256	2.330	3.277	4.531	5.621
Theoretical position/m	1.090	1.254	2.344
Measured intensity/dB	$- 50.7$	$- 44.0$	$- 47.5$	$- 20.2$	$- 23.9$	$- 27.1$
Theoretical intensity/dB	$- 51.0$	$- 44.1$	$- 47.3$

$φ$		G1	G2	G3	A1	A2	P1
45°	Measured position/m				5.148	6.233	7.974
	Measured intensity/dB				$- 23.8$	$- 22.2$	$- 23.4$
	Theoretical intensity/dB				$- 21.2$	$- 21.2$
60°	Measured position/m	1.089	1.740	2.814	5.148	6.233	7.974
	Theoretical position/m	1.085	1.741	2.826
	Measured intensity/dB	$- 39.9$	$- 39.6$	$- 41.1$	$- 19.4$	$- 17.5$	$- 18.8$
	Theoretical intensity/dB	$- 40.0$	$- 39.6$	$- 41.2$	$- 19.0$	$- 17.4$	$- 18.6$

	G1	G2	G3	G4	G5	G6
Measured position/m	2.330	1.077	1.256	1.998	0.920	3.263
Theoretical position/m	2.344	1.090	1.254	2.020	0.930	3.274

	G2	G3	G1	P3	P4	P1
Measured position/m	1.077	1.256	2.330	3.277	4.531	5.621
Theoretical position/m	1.090	1.254	2.344
Measured intensity/dB	$- 50.7$	$- 44.0$	$- 47.5$	$- 20.2$	$- 23.9$	$- 27.1$
Theoretical intensity/dB	$- 51.0$	$- 44.1$	$- 47.3$

$φ$		G1	G2	G3	A1	A2	P1
45°	Measured position/m				5.148	6.233	7.974
	Measured intensity/dB				$- 23.8$	$- 22.2$	$- 23.4$
	Theoretical intensity/dB				$- 21.2$	$- 21.2$
60°	Measured position/m	1.089	1.740	2.814	5.148	6.233	7.974
	Theoretical position/m	1.085	1.741	2.826
	Measured intensity/dB	$- 39.9$	$- 39.6$	$- 41.1$	$- 19.4$	$- 17.5$	$- 18.8$
	Theoretical intensity/dB	$- 40.0$	$- 39.6$	$- 41.2$	$- 19.0$	$- 17.4$	$- 18.6$

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Equations (30)

Applied Optics