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Passband flattening and broadening techniques for high spectral efficiency wavelength demultiplexers

Passband flattening and broadening techniques for high spectral efficiency wavelength demultiplexers

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Cancellation of the wavelength dependent image shift in demultiplexers, resulting in significant bandwidth increase, is described. Additional passband flattening using a Fabry-Perot filter is proposed. Spectral efficiencies greater than 90% can be achieved with a very low crosstalk.

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