Experimental investigation of link between growth and decay of fiber Bragg gratings

Balaji Srinivasan; V. J. Vishnu Prasad; Rajesh Joseph; S. Asokan; Nirmal K. Viswanathan

doi:10.1364/AO.50.004042

Applied Optics
Vol. 50,
Issue 21,
pp. 4042-4047
(2011)
•https://doi.org/10.1364/AO.50.004042

Experimental investigation of link between growth and decay of fiber Bragg gratings

Balaji Srinivasan, V. J. Vishnu Prasad, Rajesh Joseph, S. Asokan, and Nirmal K. Viswanathan

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Balaji Srinivasan, V. J. Vishnu Prasad, Rajesh Joseph, S. Asokan, and Nirmal K. Viswanathan, "Experimental investigation of link between growth and decay of fiber Bragg gratings," Appl. Opt. 50, 4042-4047 (2011)

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Abstract

We report here an experimental investigation for establishing and quantifying a link between the growth and decay characteristics of fiber Bragg gratings. One of the key aspects of our work is the determination of the defect energy distribution from the grating characteristics measured during their fabrication. We observe a strong correlation between the growth-based defect energy distribution and that obtained through accelerated aging experiments, paving the way for predicting the decay characteristics of fiber Bragg gratings from their growth data. Such a prediction is significant in simplifying the postfabrication steps required to enhance the thermal stability of fiber Bragg gratings.

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FBG ID	Fiber Model Number	Dopants	Exposure Time	Powerlaw-a	Powerlaw-b	Saturated $Δ n$
NP200-4	Newport F-SBG-15	${GeO}_{2} / B_{2} O_{3}$ codoped	$26 \sec$	$12 \times 10^{- 5}$	0.3487	$4.76 \times 10^{- 4}$
CG200-8	CGCRI	$8 wt. %$ ${GeO}_{2}$ $17 wt. %$ $B_{2} O_{3}$	$106 \sec$	$8 \times 10^{- 5}$	0.3615	$5.55 \times 10^{- 4}$
CA200-1	CorActive UVS-652	$10 wt. %$ ${GeO}_{2}$	$680 \sec$	$3 \times 10^{- 5}$	0.3861	$4.00 \times 10^{- 4}$
GF200-3	Nufern GF1	$9 wt. %$ ${GeO}_{2}$	$455 \sec$	$3 \times 10^{- 5}$	0.3629	$3.30 \times 10^{- 4}$
GF200-6	Nufern GF1	$9 wt. %$ ${GeO}_{2}$	$671 \sec$	$4 \times 10^{- 5}$	0.3274	$4.23 \times 10^{- 4}$
CG200-6	CGCRI	$10 wt. %$ ${GeO}_{2}$	$140 \sec$	$7 \times 10^{- 5}$	0.3344	$4.58 \times 10^{- 4}$

	Mean		Variance
FBG ID	Growth	Decay	Growth	Decay	Correlation Coefficient
NP200-4	0.56	2.40	0.20	1.00	0.992
CG200-8	0.58	2.50	0.22	1.05	0.987
CA200-1	0.61	3.02	0.22	1.30	0.971
GF200-3	0.62	3.20	0.23	1.60	0.989
GF200-6	0.63	3.30	0.23	1.40	0.993
CG200-6	0.63	3.20	0.24	1.55	0.992

FBG ID	Fiber Model Number	Dopants	Exposure Time	Powerlaw-a	Powerlaw-b	Saturated $Δ n$
NP200-4	Newport F-SBG-15	${GeO}_{2} / B_{2} O_{3}$ codoped	$26 \sec$	$12 \times 10^{- 5}$	0.3487	$4.76 \times 10^{- 4}$
CG200-8	CGCRI	$8 wt. %$ ${GeO}_{2}$ $17 wt. %$ $B_{2} O_{3}$	$106 \sec$	$8 \times 10^{- 5}$	0.3615	$5.55 \times 10^{- 4}$
CA200-1	CorActive UVS-652	$10 wt. %$ ${GeO}_{2}$	$680 \sec$	$3 \times 10^{- 5}$	0.3861	$4.00 \times 10^{- 4}$
GF200-3	Nufern GF1	$9 wt. %$ ${GeO}_{2}$	$455 \sec$	$3 \times 10^{- 5}$	0.3629	$3.30 \times 10^{- 4}$
GF200-6	Nufern GF1	$9 wt. %$ ${GeO}_{2}$	$671 \sec$	$4 \times 10^{- 5}$	0.3274	$4.23 \times 10^{- 4}$
CG200-6	CGCRI	$10 wt. %$ ${GeO}_{2}$	$140 \sec$	$7 \times 10^{- 5}$	0.3344	$4.58 \times 10^{- 4}$

	Mean		Variance
FBG ID	Growth	Decay	Growth	Decay	Correlation Coefficient
NP200-4	0.56	2.40	0.20	1.00	0.992
CG200-8	0.58	2.50	0.22	1.05	0.987
CA200-1	0.61	3.02	0.22	1.30	0.971
GF200-3	0.62	3.20	0.23	1.60	0.989
GF200-6	0.63	3.30	0.23	1.40	0.993
CG200-6	0.63	3.20	0.24	1.55	0.992

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Applied Optics