access icon free Single channel 224 Gbit/s (56-GBaud) PAM-16 transmission using linear digital pre-distortion

With linear digital pre-distortion (DPD) and 8-bit digital to analogue converter (DAC), a single channel 224 Gbit/s (56-GBaud) 16-level pulse amplitude modulation (PAM-16) signal is experimentally transmitted over a 100 m standard single-mode fibre (SSMF) for the first time using intensity modulation and direct detection (IM/DD). The 3 dB bandwidth of the whole system is around 22 GHz, which is far below the bandwidth of the 56-GBuad PAM-16 signal. The strong inter-symbol interference caused by the limited system bandwidth is pre-compensated by the proposed linear DPD technique. The experimental results indicate that the linear DPD process can effectively avoid the noise enhancement by the aggressive feed-forward equalisation at the receiver, and also improves the system performance at the cost of additional finite impulse response filter at the transmitter.

Inspec keywords: pulse amplitude modulation; digital-analogue conversion; intensity modulation; signal detection; optical fibre networks; equalisers; FIR filters; intersymbol interference

Other keywords: IM-DD; SSMF; size 100 m; direct detection; intensity modulation; linear DPD technique; single-channel PAM-16 transmission; bit rate 224 Gbit/s; standard single-mode fibre; word length 8 bit; noise enhancement; digital-to-analogue converter; linear digital pre-distortion; intersymbol interference; 16-level pulse amplitude modulation signal; finite impulse response filter; aggressive feed-forward equalisation

Subjects: Electromagnetic compatibility and interference; A/D and D/A convertors; Signal detection; Communication channel equalisation and identification; Optical fibre networks; Filtering methods in signal processing; Modulation and coding methods

References

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      • 5. Lee, J., Dong, P., Kaneda, N., et al: ‘Discrete multi-tone transmission for short-reach optical connections’. Optical Fiber Communication Conf., Anaheim, California, USA, March 2016, doi: 10.1364/OFC.2016.Th1G.1.
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