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Journal Article
Enhanced DFE-MLSE structure for high-performance optical channel equalization
- Authors
- Hae Young Rha, Seung-Woo Lee, Sang-Rok Moon, Joon Ki Lee
- Issue Date
- 2025-03
- Citation
- Optics Express, v.33, no.5, pp.12125-12135
- ISSN
- 1094-4087
- Publisher
- Optica Publishing Group
- Language
- English
- Type
- Journal Article
- Abstract
- Combining a channel memory-shortening filter with maximum likelihood sequence estimation (MLSE) effectively reduces MLSE complexity in low-bandwidth optical fiber communication systems. In this paper, we propose an enhanced decision feedback equalizer (DFE)-MLSE for high-speed fiber optic communication systems. This enhanced algorithm builds on our previous work by introducing a dispersion filter that adjusts channel memory length and by directly applying feedback filter coefficients in MLSE branch metric calculations. These advancements improve channel equalization performance, which we experimentally validate in a pulse-amplitude modulation level-4 (PAM-4) system. At a transmission rate of 112 GBd and a distance of 2 km, the enhanced DFE-MLSE achieves an approximate 0.5 dB improvement over the previous DFE-MLSE at a bit error rate of 3.8·10−3, demonstrating its potential for 200 Gbps transmission in short-reach optical networks.
- KSP Keywords
- 4-level pulse amplitude modulation(PAM-4), Bit Error rate, Branch Metric, Fiber-optic communications, Filter coefficients, High Speed, High performance, Maximum likelihood sequence estimation(MLSE), Optical fiber communication systems, Optical networks, Transmission Rate