Measurement of γ-Radiation Induced Refractive Index Changes in B/Ge Doped Fiber Using LPGs

被引：19

作者：

Kher, Sanjay ^{[1
]}

Chaubey, Smita ^{[1
]}

Oak, S. M. ^{[1
]}

Gusarov, A. ^{[2
]}

机构：

[1] RRCAT, SSLD, Fiber Opt Lab, Indore 452013, India

[2] SCKoCEN Belgian Nucl Res Ctr, B-2400 Mol, Belgium

来源：

IEEE PHOTONICS TECHNOLOGY LETTERS | 2013年 / 25卷 / 21期

关键词：

Gamma dose; long period grating (LPG); refractive index (RI); turnaround point; BRAGG GRATINGS; SENSITIVITY;

D O I：

10.1109/LPT.2013.2281200

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We propose a novel approach to measure in-situ refractive index changes induced by gamma radiation in single mode fibers. The changes are derived from wavelength shifts of resonances of a CO2 laser written long period fiber grating. Using this approach, we estimate the radiation induced refractive index increase in the core of B/Ge co-doped fiber as 2.1 x 10(-5) at 10 kGy and 1.85 x 10(-4) at 1.54 MGy. At doses >0.5 MGy, the index changes are considered to be governed by glass polarizability changes. Numerical simulations show that saturation of the index change can be observed at doses >15 MGy. Irradiation has a negligible effect on the resonance dip strengths and bandwidths, with the exception of the turnaround point mode.

引用

页码：2070 / 2073

页数：4

共 19 条

[1]

[Anonymous], 2011, Fiber Bragg Grating Sensors: Recent Advancements

[2]

Chaudhary S. K., 2011, POW EN SOC GEN M 201, P1

[3] Highly Radiation Sensitive Type IA FBGs for Future Dosimetry Applications [J].