Measurement of γ-radiation induced refractive index changes in B/Ge doped fiber using LPGs

Sanjay Kher, Smita Chaubey, Shrikant Madhusudan Oak, Andrei Goussarov

    Research outputpeer-review

    23 Scopus citations


    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 × 10 -5 at 10 kGy and 1.85 × 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.

    Original languageEnglish
    Article number6594815
    Pages (from-to)2070-2073
    Number of pages4
    JournalIEEE Photonics Technology Letters
    Issue number21
    StatePublished - 2013

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Atomic and Molecular Physics, and Optics
    • Electrical and Electronic Engineering

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