Abstract
We experimentally demonstrate the transmission of a 200Gbit/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 1.6km standard single-mode fiber with a net rate of 166.7Gbit/s, achieving an effective electrical spectrum efficiency of 4.93bit/s/Hz. Meanwhile, net rates of 174.2Gbit/s and 179.5Gbit/s are also demonstrated over 0.8km 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 3.5dB.
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