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학술지 C-band PAM-4 Signal Transmission using Soft-output MLSE and LDPC Code
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저자
문상록, 강헌식, 나해영, 이준기
발행일
201901
출처
Optics Express, v.27 no.1, pp.1-11
ISSN
1094-4087
출판사
Optical Society of America (OSA)
DOI
https://dx.doi.org/10.1364/OE.27.000110
협약과제
18HH1200, 메트로 액세스 네트워크용 200Gb/s 광트랜시버 기술 개발, 이준기
초록
We propose a DSP scheme with soft-output maximum likelihood sequence equalizer (sMLSE) and low-overhead (8.51%) low density parity check (LDPC) code for C-band PAM-4 transmission. In order to apply LDPC code in conjunction with MLSE, the conventional hard-output MLSE is modified to have a soft-output value by using the Max-log BCJR algorithm. The feasibility of this approach is experimentally investigated in a 56 Gb/s C-band PAM-4 system. In order to investigate the advantages of the proposed scheme, we compare the performance of the sMLSE-LDPC code to that of MLSE-RS code. Relatively, additional OSNR gain of 0.6 dB ~2.1 dB is achieved. The variation of the relative OSNR gain depends on the burst errors, which originate from the power fading effect. By using an interleaver that spreads burst errors in time, one can see that the relative OSNR gain is improved as 1.6 dB ~2.1 dB. Using the proposed scheme with the interleaver, one can see that the 30 km transmission of 56 Gb/s PAM-4 in the C-band was experimentally demonstrated.
KSP 제안 키워드
4-level pulse amplitude modulation(PAM-4), BCJR algorithm, C-band, Fading effect, Low density parity check (LDPC) code, RS code, Signal transmission, Soft output, burst errors, low overhead, maximum likelihood