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학술지 Realization of Real-time DSP for C-band PAM-4 Transmission in Inter-datacenter Network
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저자
문상록, 이승우, 황인기, 강헌식, 나해영, 이준기
발행일
202001
출처
Optics Express, v.28 no.2, pp.1269-1278
ISSN
1094-4087
출판사
Optical Society of America (OSA)
DOI
https://dx.doi.org/10.1364/OE.382194
협약과제
19HH1300, 메트로 액세스 네트워크용 200Gb/s 광트랜시버 기술 개발, 이준기
초록
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 제안 키워드
4-level pulse amplitude modulation(PAM-4), C-band, Chromatic dispersion(CD), Coding Gain, Compensation capacity, Digital Signal Processing, Dispersion compensation, Dispersion tolerance, Error-free transmission, Field Programmable Gate Arrays(FPGA), Forward error correction(FEC)