Dong, L., Reekie, L. and Cruz, J.L.
Long period gratings formed in depressed cladding fibres.
In, 12th International Conference on Optical Fiber Sensors, Williamsburg, US,
28 - 31 Oct 1997.
In a single mode fibre of a depressed cladding design, the LP11 mode is leaky but can propagate over a short length of fibre. This leaky LP11 mode instead of the conventional cladding modes can be used in long period gratings, with two extra benefits, I) a larger overlap, giving stronger coupling and II) coupling is insensitive to the glass-air interface therefore packaging is easier
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