Mechanically induced, long period optical fiber gratings

Details Mechanically induced, long period optical fiber gratings Mechanically induced, long period optical fiber gratings

G - Physics

02

B

G02B 5/18 (2006.01) G02B 6/14 (2006.01) G02B 6/34 (2006.01)

Patent

CA 2336493

By urging an ordinary single-mode (usually dispersion-shifted) fiber into an external, long-period mechanical grating, a highly wavelength- selective coupling between the fiber's guiding mode and a cladding mode is induced. A sequence of such induced gratings, all on the same fiber, can be used to create a many tens of nm wide loss band of arbitrary shape, with resolution of 3 nm or better, whose strength at any wavelength can be continuously adjusted from zero to -17 dB or more. With its simplicity, nearly zero background loss, and especially, with its potential for continual readjustment, the device is ideal for dynamic gain equalization of optical amplifiers.

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