Abstract
Besides the long-haul optical networks covering over thousands of kilometers for backbone transmission, short reach optical networks (SR-ONs) are widely deployed in metro-area for aggregation and accessing. The SR-ONs include the metro optical transport networks (Metro-OTN), optical access networks or other optical inter-connection systems with even shorter distance. As predicted, the growing bandwidth demanding from SR-ONs will be much more than that from the long-haul optical networks in the near future. Besides, there are tremendous amounts of optical terminals and end-users in SR-ONs compared with the long-haul transmission systems and thus will induce large cost and huge energy consumption. So, the power and cost efficiency should be the key consideration for SR-ONs besides the transmission performance. To improve the power and cost efficiency in SR-ONs, advanced modulations and detection techniques based on low power, low cost and integrated optical modulators should be utilized. In this paper, different advanced modulation formats have been discussed. 56Gbps PAM4, 112Gbps poly-binary and 100Gbps DMT that can be used to realize 400-Gbps SR-ONs for different applications have also been demonstrated respectively. In addition, low-cost and low-power opto-electronic components suitable for SR-ONs, the impairments induced by all kinds of defects and bandwidth limitation of opto-electronic components and the corresponding compensation techniques based on DSP algorithms have also been discussed in the experiments.
Highlights
The Bell Labs study forecasts that traffic derived from video will increase about 720 percent, while the data center (DC) traffic will increase more than 440 percent
We pay attention to the low-cost and low-power opto-electronic components suitable for short reach (
For further investigation the influence of low cost 10-GHz optical components on polybinary, we carry out the experiment of poly-binary PAM4 using 10GHz electro absorption modulated laser (EML) and 10GHz PIN-receiver optical sub-assembly (ROSA)
Summary
The telecom optical networks can be mainly divided into three categories: core, metro and access networks. The combined growth rate from the video and DC in metro will reach about 560 percent by 2017 and is about two times faster than traffic in backbone network. Due to the large amounts of power-on optical nodes and end-users in Metro-OTNs and OANs, the energy consumption and cost of short reach (
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