0.55 Tb/s heterogeneous Nyquist-WDM superchannel using different polarization multiplexed subcarriers

  • Divya Sharma
  • Y. K. PrajapatiEmail author
  • Rajeev Tripathi
Original Paper


This paper depicts the design of 0.55 Tb/s heterogeneous Flexi-rate Nyquist-wavelength division multiplexed (Nyquist-WDM) Superchannel. Here, for the first time, four subcarriers of different modulation formats are accommodated, namely polarization multiplexed-binary phase-shift keying, polarization multiplexed-quadrature phase-shift keying (PM-QPSK), polarization multiplexed-8-quadrature amplitude modulation and PM-16QAM, each with 27.75 Gbaud symbol rate. The system transmission performance with acceptable bit error rate (BER) 4 × 10−3 is analyzed over pure silica core fiber (PSCF) in the presence of hybrid optical amplification, i.e., Raman amplifier along with a counter-propagating pump and Erbium-doped fiber amplifier. The presence of this hybrid optical amplification unit results in a limited optical signal-to-noise ratio requirement and makes the whole system cost-effective. The proposed work delivers excellent spectral efficiency of 4.5 b/s/Hz and highest transmission reach of 5500 km for PM-QPSK subcarrier and 2300 km for PM-16QAM subcarrier in the presence of PSCF. The system performance against intersymbol interference and noise is also analyzed with the aid of eye pattern plot at a minimum and maximum transmission length.


Superchannel Nyquist-WDM Heterogeneous system PM-BPSK PM-QPSK PM-8QAM PM-16QAM Counter pump Raman amplifier Eye pattern 



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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Electronics and Communication Engineering DepartmentThapar Institute of Engineering and TechnologyPatialaIndia
  2. 2.Electronics and Communication Engineering DepartmentMotilal Nehru National Institute of Technology AllahabadPrayagrajIndia

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