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A detailed analysis of different CPE schemes for 256- QAM signals is presented. Viterbi&Viterbi algorithms demonstrate very poor performance, while the best compromise between complexity and performance is achieved using the BPS+MLE algorithm.
Coherent optical communications leveraged the fundamental philosophies and building blocks of mature wireless/copper-wire DSP technologies and has been a huge success with polarization-multiplexed QPSK at 100Gb/s per channel transponders currently in wide deployments. We discuss on further advances in DSP techniques to enable single-carrier transmission approaching 1 Tb/s as well as software-defined...
We present a frequency offset estimation using a residual carrier that is a by-product of our previous generation technique[1]. The offset range is extended to half of the symbol rate and is resilient to filtering.
A simple square or hexagonal 16-QAM generation technique using a commercially available dual drive IQ modulator driven by 4 binary signals is proposed. Square or hexagonal polarization multiplexed (PM) 16-QAM signals at 25Gbaud/s are experimentally demonstrated.
A scheme for all-optical generation of multilevel amplitude and phase shift keying (APSK) signals is proposed and numerically investigated. The proposed method is based on optical parametric amplification and cross phase modulation.
A cost-effective optical signal-to-noise ratio (OSNR) monitoring technique by electronically processing the received signals from both polarization is proposed. This method enable in-band OSNR monitoring without the need for polarization control.
8times200-Gbit/s polarization-division multiplexed DQPSK transmission system over 1200 km of SSMF has been successfully demonstrated. BER well below 1E-4 has been achieved for CS-RZ-DQPSK signal with an OSNR of 23.29 dB.
Techniques for generation and detection of optical minimum-shift keying signals are presented. The property of optical MSK and expected performance in high speed optical transmission system are discussed.
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