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We experimentally demonstrate a chromatic dispersion monitoring technique utilizing a delay-line interferometer and a <;10-GHz photodetector for 40-Gb/s OOK/DPSK. Spectral shift of RF dip changing with up to 560-ps/nm-CD is measured insensitive to 23-ps-DGD and <;15-dB-OSNR.
We experimentally compare BER performance obtained by doubling the data-rate from 10 Gb/s RZ-IMDD modulation format to 20-Gb/s-equivalent RZ-DQPSK format in a standard 2000-km 33-GHz spaced 64-channel DWDM link.
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