Performance comparison of equalization techniques in Nyquist-16QAM direct detection transmission

Nan Feng; ShaoBo Li; Qingsong Luo

doi:10.1117/12.2656007

9 January 2023 Performance comparison of equalization techniques in Nyquist-16QAM direct detection transmission

Nan Feng, ShaoBo Li, Qingsong Luo

Proceedings Volume 12507, Advanced Optical Manufacturing Technologies and Applications 2022; and 2nd International Forum of Young Scientists on Advanced Optical Manufacturing (AOMTA and YSAOM 2022); 125071P (2023) https://doi.org/10.1117/12.2656007
Event: 2nd International Forum of Young Scientists on Advanced Optical Manufacturing (AOMTA and YSAOM 2022), 2022, Changchun, China

Abstract

To mitigate the accumulated linearity chromatic dispersion (CD), this paper numerically analyzes the transmission performance of the Nyquist-pulse-shaped 16-quadrature amplitude modulation (Nyquist-16QAM) subcarrier modulation (SCM) in intensity modulation direct detection (IM/DD) using different digital equalizations. We first theoretically study the tolerance penalties performance of IM/DD system. Then we compare the CD sensitivity between multi-modulus modulus algorithm (MMA), modified MMA (MMMA), parallel MMA blind adaptation equalization, OFDE equalization based on training sequence and vestigial side band optical domain equalizer. It is shown that blind channel estimation achieves low-cost short-distance transmission, up to 30 km, while OFDE outperforms the blind adaptation compensation capability and provide up to 45 km transmission in terms of system BER at the forward error correction (FEC) threshold. In addition, the vestigialside band (VSB) filter is necessary in Nyquist-16QAM after transmission over 60km standard single mode fiber (SSMF). The receiver sensitivity is improved by 2.4dB at BER of 3.8×10^-3 for the 60km and 80km transmission under the VSB combining the OFDE.

Citation Download Citation

Nan Feng, ShaoBo Li, and Qingsong Luo "Performance comparison of equalization techniques in Nyquist-16QAM direct detection transmission", Proc. SPIE 12507, Advanced Optical Manufacturing Technologies and Applications 2022; and 2nd International Forum of Young Scientists on Advanced Optical Manufacturing (AOMTA and YSAOM 2022), 125071P (9 January 2023); https://doi.org/10.1117/12.2656007

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KEYWORDS

Receivers

Vestigial sideband modulation

Optical filters

Modulation

Parallel processing

Tolerancing

Digital signal processing

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