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Mechanically induced, reversible, long period optical fiber gratings
Mechanically induced, reversible, long period optical fiber gratings
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机译：机械感应，可逆的长周期光纤光栅
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摘要
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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