Fast-Convergence Digital Signal Processing for Coherent PON using Digital SCM

It is foreseeable that the 100 Gb/s/<inline-formula><tex-math notation="LaTeX">\lambda</tex-math></inline-formula> and beyond passive optical network (PON) will be required in future optical access networks to meet the explosive growth of data traffic. The coherent...

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Vydané v:Journal of lightwave technology Ročník 41; číslo 14; s. 1 - 9
Hlavní autori: Wang, Haide, Zhou, Ji, Xing, Zhenping, Feng, Qiguang, Zhang, Kuo, Zheng, Keshuang, Chen, Xi, Gui, Tao, Li, Liangchuan, Zeng, Jianrui, Yang, Jinyang, Liu, Weiping, Yu, Changyuan, Li, Zhaohui
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: New York IEEE 15.07.2023
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Predmet:
Algorithms
Bandwidths
Coherence
Coherent passive optical network
Convergence
data-aided algorithms
Digital signal processing
digital subcarrier multiplexing
Error correction
fast-convergence digital signal processing
Frequency division multiple access
Frequency-domain analysis
Multiplexing
Network latency
Optical communication
Optical network units
Optical signal processing
Passive optical networks
Quadrature amplitude modulation
Signal processing
specific training sequence structure
Subcarriers
Time division multiple access
Timing
ISSN:0733-8724, 1558-2213
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Shrnutí:It is foreseeable that the 100 Gb/s/<inline-formula><tex-math notation="LaTeX">\lambda</tex-math></inline-formula> and beyond passive optical network (PON) will be required in future optical access networks to meet the explosive growth of data traffic. The coherent optical systems could be a promising solution for the future beyond 100G PON. Coherent PON using digital subcarrier multiplexing (DSCM) can provide flexible bandwidth allocation to a large number of access subscribers by dividing subcarriers of the DSCM signal into time slots for time-and-frequency division multiple access. When the optical network unit is allocated a new subcarrier, digital signal processing (DSP) should converge fast in the allocated time slot to ensure a low handoff latency for real-time bandwidth allocation. However, the traditional coherent DSP is hard to realize fast convergence due to blind and complex algorithms. In this paper, we design a specific training sequence (TS) structure and propose data-aided DSP to achieve fast convergence for coherent PON. The feasibility of the proposed scheme is experimentally verified in an 8 Gbaud/SC×8 SCs 400 Gb/s-net-rate coherent PON using DSCM with 16 quadrature amplitude modulation. The experimental results show that fast convergence is jointly realized by the proposed TS structure and data-aided DSP using a 416-symbol TS with a 52 ns duration. The receiver sensitivity at the 20% soft-decision forward error correction limit is approximately -27 dBm and an optical power budget of about 35.5 dB is achieved with a booster amplifier.
Bibliografia:ObjectType-Article-1
SourceType-Scholarly Journals-1
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content type line 14
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2023.3243828