14 December 2011 Performance evaluation of 6-level PSK signal using differential demodulation with partial symbol delay
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Proceedings Volume 8309, Optical Transmission Systems, Subsystems, and Technologies IX; 83091Z (2011) https://doi.org/10.1117/12.905540
Event: SPIE/OSA/IEEE Asia Communications and Photonics, 2011, Shanghai, China
Abstract
We demonstrate an optical transmission system based on a 6-level PSK modulation format and differential detection with a partial symbol delay. The 6-level PSK signal is simply generated by using a chirp-free Mach-Zehnder modulator followed by a phase modulator. In order to convert the phase information of the 6-level PSK signal into the intensity, we utilize a pair of two Mach-Zehnder delay-line interferometers with having a differential delay less than the symbol duration of the signal unlike a conventional differential detection scheme. We evaluate the performances of the differential 6-level PSK signal and compare them with that of a conventional DQPSK signal. In addition, the transmission performance of the 21.4-Gb/s 6-level PSK signal is experimentally verified in a 240-km long dispersionmanaged fiber link. Furthermore, additional simulation results show that the tolerance to optical filtering and chromatic dispersion of the 107-Gb/s differential 6-level PSK signal is improved significantly by adopting the partial demodulation scheme.
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H. Y. Choi, H. Y. Choi, I. Morita, I. Morita, } "Performance evaluation of 6-level PSK signal using differential demodulation with partial symbol delay", Proc. SPIE 8309, Optical Transmission Systems, Subsystems, and Technologies IX, 83091Z (14 December 2011); doi: 10.1117/12.905540; https://doi.org/10.1117/12.905540
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