Offset-16QAM-based coherent WDM with multi-carrier group detection
Recently, offset-QAM based coherent WDM (CoWDM) has been proposed to build up spectrally-efficient multi-carrier superchannels. Compared with Nyquist wavelength division multiplexing (N-WDM) and orthogonal frequency division multiplexing (OFDM), offset-QAM based CoWDM can relax the stringent transmi...
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sg-ntu-dr.10356-888992020-09-26T22:04:12Z Offset-16QAM-based coherent WDM with multi-carrier group detection Xiang, Meng Fu, Songnian Tang, M. Shum, P. Liu, Deming Li, Guifang Zhou, Xiang Proceedings of SPIE - Next-Generation Optical Communication: Components, Sub-Systems, and Systems IV Photonics Centre of Excellence Research Techno Plaza Offset-QAM Modulation Multi-carrier Group Detection DRNTU::Engineering::General Recently, offset-QAM based coherent WDM (CoWDM) has been proposed to build up spectrally-efficient multi-carrier superchannels. Compared with Nyquist wavelength division multiplexing (N-WDM) and orthogonal frequency division multiplexing (OFDM), offset-QAM based CoWDM can relax the stringent transmitter-side requirements for spectrum shaping and achieve significant transmission performance improvement. In order to efficiently utilize the sampling rate of commercially available analog-to-digital converter (ADC) and decrease the receiver-side implementation complexity, multi-carrier group detection scheme is investigated in offset-QAM based CoWDM where multiple carriers are simultaneously detected within single coherent receiver, followed by carrier separation in the digital domain through the 4-point discrete Fourier transform (DFT) method at the baseband. Here, we demonstrate a transmission of five-carrier 100 Gb/s polarization-multiplexed offset-16QAM signal with 12.5 GHz channel spacing. Through 3-carrier group detection, the sampling rate per-carrier is reduced to 1.33 times symbol rate in terms of 50 GS/s ADC and there is only 0.35 dB required OSNR penalty at BER=10-3 compared with conventional single channel coherent detection. Meanwhile, good tolerance of coherent receiver analog bandwidth is secured and receiver bandwidth is reduced to 8 GHz. Moreover, 0.5 dB required OSNR penalty at BER=10-3 is obtained given 18 GHz ADC bandwidth. Besides, we find that side carriers suffer from severer performance degradation than the central carrier with limited ADC resolution and only 0.08 dB and 0.2 dB required OSNR penalty at BER=10-3 are secured with 6 bits ADC resolution for central carrier and side carriers, respectively. Published version 2018-12-17T06:04:35Z 2019-12-06T17:13:19Z 2018-12-17T06:04:35Z 2019-12-06T17:13:19Z 2015 Conference Paper Xiang, M., Fu, S., Tang, M., Shum, P., & Liu, D. (2015). Offset-16QAM-based coherent WDM with multi-carrier group detection. Proceedings of SPIE - Next-Generation Optical Communication: Components, Sub-Systems, and Systems IV, 9389, 93890L-. doi:10.1117/12.2076882 https://hdl.handle.net/10356/88899 http://hdl.handle.net/10220/46998 10.1117/12.2076882 en © 2015 Society of Photo-optical Instrumentation Engineers (SPIE). This paper was published in Proceedings of SPIE - Next-Generation Optical Communication: Components, Sub-Systems, and Systems IV and is made available as an electronic reprint (preprint) with permission of Society of Photo-optical Instrumentation Engineers (SPIE). The published version is available at: [http://dx.doi.org/10.1117/12.2076882]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law. 6 p. application/pdf |
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Offset-QAM Modulation Multi-carrier Group Detection DRNTU::Engineering::General Xiang, Meng Fu, Songnian Tang, M. Shum, P. Liu, Deming Offset-16QAM-based coherent WDM with multi-carrier group detection |
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Recently, offset-QAM based coherent WDM (CoWDM) has been proposed to build up spectrally-efficient multi-carrier superchannels. Compared with Nyquist wavelength division multiplexing (N-WDM) and orthogonal frequency division multiplexing (OFDM), offset-QAM based CoWDM can relax the stringent transmitter-side requirements for spectrum shaping and achieve significant transmission performance improvement. In order to efficiently utilize the sampling rate of commercially available analog-to-digital converter (ADC) and decrease the receiver-side implementation complexity, multi-carrier group detection scheme is investigated in offset-QAM based CoWDM where multiple carriers are simultaneously detected within single coherent receiver, followed by carrier separation in the digital domain through the 4-point discrete Fourier transform (DFT) method at the baseband. Here, we demonstrate a transmission of five-carrier 100 Gb/s polarization-multiplexed offset-16QAM signal with 12.5 GHz channel spacing. Through 3-carrier group detection, the sampling rate per-carrier is reduced to 1.33 times symbol rate in terms of 50 GS/s ADC and there is only 0.35 dB required OSNR penalty at BER=10-3 compared with conventional single channel coherent detection. Meanwhile, good tolerance of coherent receiver analog bandwidth is secured and receiver bandwidth is reduced to 8 GHz. Moreover, 0.5 dB required OSNR penalty at BER=10-3 is obtained given 18 GHz ADC bandwidth. Besides, we find that side carriers suffer from severer performance degradation than the central carrier with limited ADC resolution and only 0.08 dB and 0.2 dB required OSNR penalty at BER=10-3 are secured with 6 bits ADC resolution for central carrier and side carriers, respectively. |
author2 |
Li, Guifang |
author_facet |
Li, Guifang Xiang, Meng Fu, Songnian Tang, M. Shum, P. Liu, Deming |
format |
Conference or Workshop Item |
author |
Xiang, Meng Fu, Songnian Tang, M. Shum, P. Liu, Deming |
author_sort |
Xiang, Meng |
title |
Offset-16QAM-based coherent WDM with multi-carrier group detection |
title_short |
Offset-16QAM-based coherent WDM with multi-carrier group detection |
title_full |
Offset-16QAM-based coherent WDM with multi-carrier group detection |
title_fullStr |
Offset-16QAM-based coherent WDM with multi-carrier group detection |
title_full_unstemmed |
Offset-16QAM-based coherent WDM with multi-carrier group detection |
title_sort |
offset-16qam-based coherent wdm with multi-carrier group detection |
publishDate |
2018 |
url |
https://hdl.handle.net/10356/88899 http://hdl.handle.net/10220/46998 |
_version_ |
1681059510542663680 |