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Electronic pre-equalization of chromatic dispersion for 43 Gb/s DQPSK has been demonstrated employing a developed test chip. The chip enables the BER in fibre with 2450 ps/nm of dispersion to be improved to 7.6E-05 without an optical dispersion compensator.
The transmission performance of 50 GHz spaced 40 Gb/s RZ-DQPSK co-propagating with 10 Gb/s signals over legacy submarine fibre was investigated experimentally to show that it is dependent on both the modulation format of the 10 Gb/s signals and the dispersion map.
Electronic pre-equalization for 43 Gb/s DQPSK has been demonstrated for the first time. Waveform distortion caused by bandwidth narrowing to 18.1 GHz by cascaded 10 Gb/s ROADMs has been adequately pre-equalized by a SiGe-BiCMOS LSI with 6-bit, 43 GS/s digital-to-analog converters.
We demonstrate an error-free all-optical 2times10.7 Gb/s NRZ-OOK to 10.7 Gsymbol/s RZ-QPSK modulation format conversion using a newly developed integrated SOA three-arm-MZI wavelength converter module.
We propose a novel all-optical NRZ-OOK/RZ-QPSK modulation format converter using parallelized SOA-MZIs and demonstrate the proof-of-the-principle experiment at 10.7 GSymbol/s by using the test parallel SOA-MZI OOK/BPSK converters.
We show numerically that in a 40Gb/s-QPSK system, dispersion incompletely compensated by pre-distortion can be precisely equalized by a post-equalizer. The compensation capability is strongly dependent on the demodulation scheme, i.e. coherent or incoherent.
We demonstrate a transmission of 20 channels at 20 Gb/s using RZ-DQPSK format over 5090 km of dispersion-managed fiber with distributed Raman amplifiers. For this condition, RZ-DQPSK signals are mainly degraded by single channel distortion.
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