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Journal Article
Realization of Real-time DSP for C-band PAM-4 Transmission in Inter-datacenter Network
- Authors
- Sang-Rok Moon, Seung-Woo Lee, In-Ki Hwang, Hun-Sik Kang, Hae Young Rha, Joon Ki Lee
- Issue Date
- 2020-01
- Citation
- Optics Express, v.28, no.2, pp.1269-1278
- ISSN
- 1094-4087
- Publisher
- Optical Society of America (OSA)
- Language
- English
- Type
- Journal Article
- Abstract
- We designed and realized real-time pulse amplitude modulation-4 (PAM-4) digital signal processing (DSP) including forward error correction (FEC) for a C-band inter-datacenter network. The PAM-4 DSP is intended to compensate for chromatic dispersion and provide dispersion tolerance. A decision feedback equalizer (DFE) and maximum likelihood sequence equalizer (MLSE) were employed for the dispersion compensation. A low-density parity check (LDPC) code was used to increase coding gain. The soft-decision Viterbi algorithm (SOVA) was adopted to provide probabilistic information to the LDPC code. For implementation in a real-time field programmable gate arrays (FPGAs), we employed fully parallelized structures. In the design, three LDPC cores were operated in parallel, and the equalizers were also operated with 128 PAM-4 symbols. With the DSP, we empirically proved the feasibility of 25 km transmission without error-floor sign, corresponding to a dispersion compensation capacity of 425 ps/nm. We confirmed 35 km ~ 85 km error-free transmission for inter-datacenter network.
- KSP Keywords
- 4-level pulse amplitude modulation(PAM-4), C-band, Chromatic dispersion(CD), Coding Gain, Compensation capacity, Digital Signal Processing, Dispersion compensation, Dispersion tolerance, Field-Programmable Gate Array(FPGA), Forward Error Correction(FEC), Inter-datacenter network
This work is distributed under the term of Creative Commons License (CCL)
(CC BY)
(CC BY)
