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We demonstrated a simple scheme to generate ultra wideband (UWB) doublet pulses by inputting a dark return-to-zero (RZ) signal into a fiber delay interferometer (FDI). An 0.625-Gbit/s dark-RZ pulse train where the pulse width is 120ps was inputted into a FDI where the free spectral range (FSR) is 0.16nm (∼20GHz, according time delay is ∼50ps) and the extinction ratio (ER) is 9dB, and the phase difference...
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