| 摘要 |
A method and apparatus is provided to compensate for dispersion of a WDM optical signal. The method begins by directing a WDM optical signal having a prescribed bandwidth to a first dispersion compensating element and substantially compensating, with the first dispersion compensating element, each wavelength in the WDM optical signal for dispersion at a prescribed wavelength within a first sub-band of the prescribed bandwidth. The method continues by directing to a second dispersion compensating element wavelengt hs received from the first dispersion compensating element outside the first su b- band and substantially compensating, with the second dispersion compensating element, each wavelength received from the first dispersion compensating element for dispersion at a prescribed wavelength within a second sub-band o f the prescribed bandwidth; The wavelengths received from the second dispersio n compensating element are combined within the second sub-band of the prescrib ed bandwidth with the wavelengths received from the first dispersion compensati ng element within the first sub-band.
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