Optics-simplified DSP for 50 Gb/s PON downstream transmission using 10 Gb/s optical devices

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Xue, Lei,1992Shanghai Jiao Tong University,Chalmers tekniska högskola,Chalmers University of Technology (author)

Optics-simplified DSP for 50 Gb/s PON downstream transmission using 10 Gb/s optical devices

Article/chapterEnglish2020

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2020
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LIBRIS-ID:oai:research.chalmers.se:b2aa62b5-c257-438b-961d-7806ffca3ac9
https://research.chalmers.se/publication/515619URI
https://research.chalmers.se/publication/513867URI
https://doi.org/10.1109/JLT.2019.2942438DOI

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Language:English
Summary in:English

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Directly-modulated laser (DML) is widely employed in intensity modulation and direct detection (IMDD) system due to its low cost and high output power. However, the corresponding frequency chirp is regarded as one of the main disadvantages for its application in passive optical networks (PONs). In this paper, we theoretically analyze the frequency response evolution of DML based system under different chirp and dispersion conditions, proving that the system bandwidth can be improved by interactions between negative dispersion and DML chirp. Based on this concept, we experimentally demonstrated downstream 50 Gb/s PAM4 signal transmission over 20 km single-mode fiber (SMF) access based on the 10 Gb/s DML operating at 1310 nm and avalanche photodiode (APD). A dispersion-shifted fiber (DSF) providing -150 ps/nm dispersion at 1310 nm in the optical line terminal (OLT) is used to pre-equalize the frequency response of bandwidth-limited directly modulated signals in the optical domain. Thanks to our proposed dispersion-supported equalization (DSE) technique, the system bandwidth can be improved by 5 GHz. Feed-forward equalization (FFE), decision feedback equalization (DFE) and Volterra filter are employed to evaluate the signal performance improvement, respectively. By evaluating the receiver sensitivity, the DSE combined with FFE scheme shows 2 dB improvement than the complex Volterra algorithm, indicating its potential to reduce the complexity of digital signal processing (DSP) and therefore a lower cost and power consumption in PON.

Subject headings and genre

TEKNIK OCH TEKNOLOGIER Elektroteknik och elektronik Telekommunikation hsv//swe
ENGINEERING AND TECHNOLOGY Electrical Engineering, Electronic Engineering, Information Engineering Telecommunications hsv//eng
NATURVETENSKAP Fysik Atom- och molekylfysik och optik hsv//swe
NATURAL SCIENCES Physical Sciences Atom and Molecular Physics and Optics hsv//eng
NATURVETENSKAP Fysik Den kondenserade materiens fysik hsv//swe
NATURAL SCIENCES Physical Sciences Condensed Matter Physics hsv//eng
Directly modulated laser (DML)
Digital signal processing(DSP)
Dispersion-supported equalization (DSE)
Passive optical network (PON).
Direct detection

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Yi, LilinShanghai Jiao Tong University (author)
Hu, WeishengShanghai Jiao Tong University (author)
Lin, Rui,1988Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)ruilin (author)
Chen, Jiajia,1981Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)jiajiac (author)
Shanghai Jiao Tong UniversityChalmers tekniska högskola (creator_code:org_t)

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In:Journal of Lightwave Technology38:3, s. 583-5890733-87241558-2213

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