Abstract
In this paper, we experimentally demonstrate the transmission of 100G PAM-6 and PAM-8 signals for 10-km intra-data center interconnects (intra-DCI) in C-band, which is enabled by pre-chirping technique utilizing a commercial dual-arm Mach-Zehnder modulator (MZM). At the transmitter side, the use of pre-chirping technology can overcome frequency selective fading (FSF) caused by fiber dispersion (CD) in intensity modulation and direct detection (IM/DD) systems. The pre-chirping is realized by adjusting the bias voltage of dual-arm MZM operating at single driven state. At the receiver, Volterra Non-Linear Equalizer (VNLE) is used to eliminate nonlinear impairments caused by pre-chirping. With the joint pre-chirping and nonlinear elimination in single driven dual-arm MZM based IM/DD system, 45-Gbaud PAM-6 and 40-Gbaud PAM-8 signals are successfully transmitted over 10-km single mode fiber (SMF) with a bit-error-ratio (BER) below 3.8 × 10-3. While in the chirp-free IM/DD system with dual-arm MZM operating at push-pull state, BERs of 45-Gbaud PAM-6 and 40-Gbaud PAM-8 signals over 10-km SMF transmission deteriorate dramatically to nearly 1 × 10-1. The experimental results show that our proposed pre-chirping scheme can effectively enhance the robustness of IM/DD systems against the CD-induced FSF, and this scheme is a promising candidate for 10-km 100G intra-DCI.
Original language | English |
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Article number | 8998247 |
Pages (from-to) | 3445-3453 |
Number of pages | 9 |
Journal | Journal of Lightwave Technology |
Volume | 38 |
Issue number | 13 |
DOIs | |
Publication status | Published - 1 Jul 2020 |
Keywords
- 10-km intra-datacenter interconnect (intra-DCI)
- dual-arm Mach-Zehnder modulator (MZM)
- intensity modulation with direct detection (IM/DD)
- pre-chirping
- pulse amplitude modulation (PAM)
- volterra non-linear equalizer (VNLE)