Directly PAM-4 Modulated 1530-nm VCSEL Enabling 56 Gb/s/lambda Data-Center Interconnects

作者：Karinou Fotini^*; Prodaniuc Cristian; Stojanovic Nebojsa; Ortsiefer Markus; Daly Aidan; Hohenleitner Robert; Koegel Benjamin; Neumeyr Christian

来源：IEEE Photonics Technology Letters, 2015, 27(17): 1872-1875.

DOI：10.1109/LPT.2015.2444096

• Pulse amplitude modulation
• equalizers
• maximum likelihood estimation
• vertical cavity surface emitting lasers
• optical interconnects

We demonstrate a 56 Gb/s four-level pulse-amplitude modulation (PAM-4) transmission using direct detection and a long-wavelength 18-GHz bandwidth vertical-cavity surface-emitting laser as directly modulated light source for short-reach inter-and intra-connects in datacenters and short-reach networks. Error-free transmission over 2 km at 7% hard-decision forward-error correction threshold is achieved by applying powerful equalization schemes at the receiver side. Three equalization schemes, i.e., a maximum likelihood estimation (MLSE), a feed-forward equalizer (FFE), and a combination of the FFE and the MLSE are thoroughly investigated, and the performance comparison between them is carried out.

• 出版日期2015-9-1