| 摘要 |
The present invention provides a method and system for dispersion compensation for a composite optical signal in an optical fiber transmission system. The composite optical signal includes a plurality of channels, each of the plurality of channels includes a band of wavelengths, where the bands of wavelengths have unwanted dispersion and dispersion slope. The present invention includes propagating the composite optical signal in a forward direction; separating the wavelengths in the band of wavelengths in each of the plurality of channels, where the each of the wavelengths in the band is spatially distinguishable from the other wavelengths in the band; spatially separating each band of wavelengths in the plurality of channels; and reflecting the spatially separated bands of wavelengths toward a return direction, where dispersion is added to the reflected bands of wavelengths such that the unwanted dispersion and dispersion slope are compensated. The dispersion compensator in accordance with the present invention utilizes a Virtually Imaged Phased Array (VIPA) and diffraction gratings. The compensator provides simultaneous tunable compensation of dispersion and dispersion slope utilizing a single apparatus. A system which utilizes the compensator is thus cost effective to manufacture. |
