Journal
OPTICS COMMUNICATIONS
Volume 504, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.optcom.2021.127486
Keywords
On-off keying; Passive optical network; Digital signal processing
Categories
Funding
- National Key R&D Program of China [2018YFB1802300]
- National Natural Science Foundation of China [62005102]
- Natural Science Foundation of Guangdong Province [2019A1515011059]
- Guangzhou Basic and Applied Basic Research Foundation [202102020996]
- Fundamental Research Funds for the Central Universities [21619309]
- Open Fund of IPOC (BUPT) [IPOC2019A001]
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This paper experimentally demonstrates a DSP-enabled 50G PON using cost-effective O-band 10G directly modulated laser and 10G avalanche photodiode. Digital pre-distortion and post-detection are proposed to compensate for serious spectral distortions, leading to improved BER performance.
In this paper, we experimentally demonstrate a digital signal processing (DSP)-enabled 50G on-off keying passive optical network (PON) using cost-effective O-band 10G directly modulated laser and 10G avalanche photodiode. The bandwidth-limited devices induce serious spectral distortions, leading to an unacceptable performance. Digital pre-distortion at the transmitter and post-detection at the receiver are proposed to jointly compensate the serious spectral distortions. The digital pre-distortion at the transmitter can compensate for a part of spectral distortions, but cannot deal with the fast power fading within the high-frequency range. At the receiver, the digital post-detection is proposed to compensate the high-frequency distortions, which mainly includes the polynomial nonlinear equalizer, two-tap post filter, and maximum likelihood sequence estimation (MLSE) with channel estimator. Different from the conventional digital post-detection, the channel estimator can estimate more accurate channel information for MLSE, leading to a better bit error rate (BER) performance. By using the proposed digital signal processing, power budget beyond 29 dB is achieved at BER of 2 x 10(-2) after 20 km standard single-mode fiber transmission. In conclusion, the proposed DSP-enabled 50G-PON shows great application potentials for the next-generation PON.
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