Similar title to Rollinson, C.M, Wade, S.A, Dragomir, N.M, Baxter, G.W, Collins, S.F and Roberts, A (2005) Reflections near 1030 nm from 1540 nm fibre Bragg gratings: Evidence of a complex refractive index structure. Optics Communications, 256 (4-6). pp. 310-318. ISSN 03004018