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SRI response in the range of 1.30 to 1.44 for the DPLPG UV inscribed in the thin cladding SM1500 (4.2/80) fibre with a 150 μm period: (a) spectral evolution for the normal blue shifting peak 1, (b) spectral evolution for dual-peaks 2 and 3 which move in opposite directions, (c) SRI sensitivity result for peak 1 with increased SRI, (d) SRI sensitivity results for peak 2 and 3 with increased SRI.
