Reduced-state MLSE for an IM/DD system using PAM modulation

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The performance of a high-speed intensity-modulation (IM)/direct-detection (DD) transmission system could be limited by the bandwidth of optical transceivers. One popular way to cope with this performance limitation is to utilize the maximum likelihood sequence estimation (MLSE) at the receiver. However, a practical problem of MLSE is its high implementation complexity. Even though the channel impulse response can be truncated by using a two-tap filter before applying the MLSE, it still faces an implementation problem when used for multi-level modulation formats. In this paper, we propose and demonstrate a reduced-state MLSE for band-limited IM/DD transmission systems using M-ary pulse amplitude modulation (PAM-M) formats. We use a conventional Viterbi algorithm to search a reduced-state trellis, which is constructed by using the coarse pre-decision of the signal equalized by a feed-forward equalizer. Thus, the proposed MLSE reduces the implementation complexity significantly. We evaluate the performance of the proposed reduced-state MLSE over 100 similar to 140-Gb/s PAM-4/6/8 transmission systems implemented by using a 1.3-mu m directly modulated laser. The results show that the proposed MLSE achieves almost the same performance as the conventional MLSE but reduces the implementation complexity by a factor of 4 similar to 10 when the complexity is assessed by the number of multiplications and additions. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Publisher
OPTICAL SOC AMER
Issue Date
2020-12
Language
English
Article Type
Article
Citation

OPTICS EXPRESS, v.28, no.26

ISSN
1094-4087
DOI
10.1364/OE.410674
URI
http://hdl.handle.net/10203/280048
Appears in Collection
EE-Journal Papers(저널논문)
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