- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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Decoding of 10-G Optics-Based 50-Gb/s PAM-4 Signal Using Simplified MLSE
摘要： A simpli?ed maximum likelihood sequence estimation (MLSE) based on Viterbi algorithm has been proposed. Experimental results show that compared with the conventional MLSE, the proposed algorithm saves the multiplication by 25% with no sensitivity penalty when the memory length of MLSE is 2 both in the 25 Gb/s nonreturn to zero and 50 Gb/s four-level pulse-amplitude modulation (PAM-4) transmission systems. In order to further reduce the number of multiplications in the 50 Gb/s PAM-4 transmission system, we use 75 taps of feed-forward equalization to equalize the received PAM-4 signal into duo-binary PAM-4 (DB-PAM-4) signal and then use MLSE with the memory length of 1 to decode, which improves the sensitivity performance by 1.8 dB and reduces the computing complexity by ～98% compared with conventional MLSE (L = 4) method. As a result, a 10-km C-band transmission of 50 Gb/s PAM-4 signal is achieved using optical transceivers with a combined 3-dB bandwidth of ～8 GHz, and only 107 multiplications are required by using our proposed simpli?ed algorithm for equalization.
关键词： feed-forward equalization (FFE),four-level pulse-amplitude modulation (PAM-4),Viterbi algorithm,Maximum likelihood sequence estimation (MLSE)
更新于2025-09-23 15:21:01
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SiGe-Driven Hybrid-Integrated Silicon Photonic Link Using Optical-Domain Equalization
摘要： We report 50 and 60-Gb/s hybrid-integrated optical links in the O-band with CMOS photonic components driven by feed-forward silicon-germanium equalization. The link includes a segmented-electrode Mach Zehnder modulator and a Ge photodetector that provide high bandwidths and the potential for tight integration with control and monitoring electronics. The combination of these features enable the demonstration of a 60-Gb/s AC-coupled link and a 50-Gb/s DC-coupled link with BERs below 10-12 without the use of forward-error correction codes. This result provides a promising path toward extending speeds in latency sensitive optical links.
关键词： high-speed transmission,photonic integrated circuits,optical interconnects,Feed-forward equalization
更新于2025-09-10 09:29:36