Zhang Lu, Hong Xuezhi, Pang Xiaodan, Ozolins Oskars, Udalcovs Aleksejs, Schatz Richard, Guo Changjian, Zhang Junwei, Nordwall Fredrik, Engenhardt Klaus M, Westergren Urban, Popov Sergei, Jacobsen Gunnar, Xiao Shilin, Hu Weisheng, Chen Jiajia
Opt Lett. 2018 Jan 15;43(2):182-185. doi: 10.1364/OL.43.000182.
We experimentally demonstrate the transmission of a 200 Gbit/s discrete multitone (DMT) at the soft forward error correction limit in an intensity-modulation direct-detection system with a single C-band packaged distributed feedback laser and traveling-wave electro absorption modulator (DFB-TWEAM), digital-to-analog converter and photodiode. The bit-power loaded DMT signal is transmitted over 1.6 km standard single-mode fiber with a net rate of 166.7 Gbit/s, achieving an effective electrical spectrum efficiency of 4.93 bit/s/Hz. Meanwhile, net rates of 174.2 Gbit/s and 179.5 Gbit/s are also demonstrated over 0.8 km SSMF and in an optical back-to-back case, respectively. The feature of the packaged DFB-TWEAM is presented. The nonlinearity-aware digital signal processing algorithm for channel equalization is mathematically described, which improves the signal-to-noise ratio up to 3.5 dB.
