| 摘要 |
In accordance with the present invention, optical fiber communications systems are provided with one or more long period spectral shaping devices to sh ift light of unwanted wavelength from guided modes into non-guided modes. Such devices can be used for removing unused laser pump energy, for removing amplifie d spontaneous emission, and for flattening the spectral response of an erbium amplifier. Such devices can also provide optical fiber sensing systems with inexpensive shift detectors.
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