Abstract
The inter-data center links are meeting the challenge of increasing transmission capacity continuously. Here, the tradeoff between transmission capacity and cost and power consumption especially needs to be considered. The field modulation polarization-division-multiplexed (PDM) four-level pulse amplitude modulation (PAM4) with coherent detection is a potential candidate for 400 Gb/s and beyond inter-data center transmissions, which has several advantages including low-cost, low optical signal to noise ratio (OSNR) requirement and high receiver sensitivity. In this paper, the feasibility and effectiveness of the field PDM-PAM4 coherent system are investigated over multi core fiber (MCF). In order to adapt to the field PAM signals, the signal-phase aid least-mean square (SP-LMS) and training multi-modulus algorithm (TMMA) are modified and analyzed for equalization and polarization demultiplexing. Finally, it is demonstrated that 4×112 Gb/s field PDM-PAM4 is successful transmitted over 16 km MCF and 384 km SSMF in C-band with a BER below 3.8e-3.
Highlights
The applications such as the internet of things, live streaming online and cloud computing services will be deployed rapidly in the 5G era, which makes requirement of increasing transmission bandwidth of links of intra- or interdatacenter urgent
Carrier-less amplitude and phase (CAP) modulation [2,3,4], discrete multi-tone (DMT) modulation [5, 6], and PAM [7, 8] are the modulation formats, which are suitable for intensity modulation and direct detection (IM-DD)
Nyquist pulse shaping is used to remove the inter-symbol interferences (ISI) caused by the bandwidth limitation of devices, such as DAC and Mach-Zehnder modulator (MZM)
Summary
The applications such as the internet of things, live streaming online and cloud computing services will be deployed rapidly in the 5G era, which makes requirement of increasing transmission bandwidth of links of intra- or interdatacenter urgent. Carrier-less amplitude and phase (CAP) modulation [2,3,4], discrete multi-tone (DMT) modulation [5, 6], and PAM [7, 8] are the modulation formats, which are suitable for intensity modulation and direct detection (IM-DD) They can provide a low-cost and power-efficiency solution to meet the requirements of the data center. Demonstration about 400G transceivers using 4 × 100G 4-level pulse amplitude modulation (PAM4) signals stick out all over Have they low complexity of system architecture and performance can be safeguarded. It is noteworthy that frequency offset estimation (FOE) and low- complexity carrier phase recovery (CPR) are necessary for this work This is because MZM is operated at the null point for field PAM4 modulation. After the decision for symbol and mapping from symbol to bit, the BER is calculated
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