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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 demonstrate an OSNR monitoring technique for 80-Gb/s polarization-multiplexed RZ-DPSK utilizing narrowband optical filter and RF spectrum analysis. Maximum RF power increment of 19.7 dB, insensitive to CD and PMD, is measured for monitoring of OSNR up to 27 dB.
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