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access icon free Performance of grey-coded IQM-based optical modulation formats on high-speed long-haul optical communication link

© The Institution of Engineering and Technology
Received 22/02/2019, Accepted 29/07/2019, Revised 12/06/2019, Published 02/08/2019

In this article the performance of grey-coded advanced optical modulation formats is evaluated on a single-channel high-speed long-haul optical communication link and are compared to the respective differential-coded modulation formats. Polarisation division multiplexed optical in-phase quadrature modulator (IQM) structure and homodyne detection scheme are used to realise 100 Gbps quadrature phase-shift keying (QPSK), 120 Gbps 16-ary quadrature amplitude modulation (16-QAM), 360 Gbps 32-QAM and 480 Gbps 64-QAM modulation formats. Advanced digital signal processing unit with various pre-processing and recovery stages such as direct current blocking, normalisation, low-pass Bessel filter, resampling, quadrature imbalance compensation, chromatic dispersion compensation, non-linear compensation, timing recovery, adaptive equalisation, down-sampling, frequency offset estimation, and carrier phase estimation is used at the receiving end to compensate for signal impairments during propagation. Maximum transmission distances of 7200, 1050, 560, and 360 km have been achieved at an acceptable bit error rate for QPSK, 16-QAM, 32-QAM, and 64-QAM, respectively. The grey-coded systems outperformed the differential-coded systems regarding optical signal-to-noise ratio requirement, receiver sensitivity, and transmission distance.

Inspec keywords: homodyne detection; error statistics; quadrature amplitude modulation; phase estimation; quadrature phase shift keying; optical links; modulation coding; adaptive equalisers; optical modulation

Other keywords: nonlinear compensation; carrier phase estimation; quadrature phase-shift keying; quadrature imbalance compensation; 64-QAM modulation formats; distance 7200.0 km; 16-QAM; grey-coded IQM-based optical modulation formats; low-pass Bessel filter; advanced digital signal processing unit; single-channel high-speed long-haul optical communication link; grey-coded advanced optical modulation formats; polarisation division multiplexed optical in-phase quadrature modulator structure; 16-ary quadrature amplitude modulation; homodyne detection scheme; distance 360.0 km; 32-QAM; chromatic dispersion compensation; optical signal-to-noise ratio requirement; distance 560.0 km; distance 1050.0 km

Subjects: Free-space optical links; Modulation and coding methods; Other topics in statistics; Communication channel equalisation and identification

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