研究目的
To propose a simplified maximum likelihood sequence estimation (MLSE) algorithm for reducing computing complexity in 25 Gb/s NRZ and 50 Gb/s PAM-4 transmission systems without sensitivity penalty.
研究成果
The proposed simplified MLSE algorithm effectively reduces computing complexity without sensitivity penalty in 25 Gb/s NRZ and 50 Gb/s PAM-4 transmission systems. Using 75 taps of FFE to equalize the signal into DB-PAM-4 format further reduces complexity and improves sensitivity, offering a cost-efficient solution for future optical networks.
研究不足
The complexity of MLSE increases exponentially with the memory length, which may limit its practical application in systems requiring high memory lengths.
1：Experimental Design and Method Selection:
The study proposes a simplified MLSE algorithm based on the Viterbi algorithm for decoding signals in NRZ and PAM-4 transmission systems.
2：Sample Selection and Data Sources:
The experiments are conducted using 25 Gb/s NRZ and 50 Gb/s PAM-4 signals transmitted over standard single mode fiber (SSMF).
3：List of Experimental Equipment and Materials:
Equipment includes Arbitrary waveform generator (AWG), 10-G electro-absorption modulated laser based TOSA (10G EML TOSA), 10-G avalanche photodiode based ROSA (10G APD ROSA), and 12-G PIN-TIA.
4：Experimental Procedures and Operational Workflow:
The signal from the AWG is amplified and drives the EML TOSA. After transmission, the signal is converted back to electrical signal by APD or PIN-TIA, sampled by DSO, and processed offline in Matlab.
5：Data Analysis Methods:
The performance of the proposed algorithm is compared with conventional MLSE in terms of sensitivity and computing complexity.
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