70 Gbps 4-PAM and 56 Gbps 8-PAM Using an 850 nm VCSEL
70 Gbps 4-PAM and 56 Gbps 8-PAM Using an 850 nm VCSEL
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DOI：
10.1109/jlt.2015.2389898
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发表时间：
2014-11
影响因子：
4.7
通讯作者：
K. Szczerba;P. Westbergh;M. Karlsson;P. Andrekson;A. Larsson
中科院分区：
文献类型：
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作者：
K. Szczerba;P. Westbergh;M. Karlsson;P. Andrekson;A. Larsson
我们提出了56 Gbps的非均衡8脉冲幅度调制（PAM）的实时传输超过50米的多模光纤和70 Gbps的4-PAM操作与离线均衡。FEC在这两种方案中都是必要的。考虑到达到低于10-12的BER所需的FEC开销，给出了比特率。实验采用850 nm垂直腔面发射激光器和22 GHz光接收器。我们表明，8-PAM调制需要信道带宽与符号速率相媲美，以避免过度的ISI惩罚和4-PAM信号的均衡可以显着提高可实现的比特率。
We present 56 Gbps unequalized 8-pulse-amplitude-modulation (PAM) real-time transmission over 50 m of multimode fiber and 70 Gbps 4-PAM operation with offline equalization. FEC would be necessary in both schemes. The bit-rates are given taking into account the FEC overhead needed to reach a BER below 10-12. The experiments were performed with an 850 nm vertical cavity surface emitting laser with 20 GHz bandwidth and a 22 GHz photoreceiver. We show that 8-PAM modulation requires channel bandwidth comparable with the symbol rate to avoid excessive ISI penalty and that equalization of 4-PAM signal can significantly improve achievable bit-rates.