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With the development of passive optical networks (PONs), to cache videos on optical network units (ONUs) is now considering as an efficient scheme for better-quality video service provision. In this paper, we study the problem of collaborative video distribution among ONUs under the limited storage capacity of each ONU with the aim to maximize the video hit ratio of ONUs (VHRO). Two scenarios will...
This paper proposes a two-dimension encryption orthogonal frequency division multiplexing passive optical network (OFDM-PON) based on dynamic chaos-iteration. The correlation monitoring method is adopted to achieve dynamic key distribution between OLT and ONUs. It is shown that key space can be larger than 1086, which would be against exhaustive attack effectively. We experimentally demonstrate a...
We proposed an optical access network for the deployment of CPS and the realization of smart factories aim for Industry 4.0. Through the distributed optical network, factory control center can virtualize machines, thereby realizing machine co-operation and monitoring product quality, which is the foundation of deploying CPS and realizing smart factory. While the optical access network provides a networking...
To achieve the better combination of cost and communication capacity, this paper proposes a colourless ONU remodulation scheme based on R-QDSOA in WDM-PON. The R-QDSOA can provide a modulation bandwidth over 20GHz and achieve directly modulation of high-order signal. Here, two remodulation schemes (respectively NRZ/4QAM and 4QAM/NRZ) at different modulation rates are implemented, which offers good...
Using Ethernet in fronthaul can achieve statistical multiplexing gains based on the new function split. When TWDM-PON is used in Ethernet based fronthaul network, the large granularity of bandwidth requirements and the diversified service types will lead to the bandwidth fragmentation in OLT pooling. To solve this challenge, we develop a mathematical model by establishing the 0–1 relationship matrix...
The finite gain recovery time of the reflective semiconductor optical amplifier (RSOA) causes distortion and pattern dependence at high bit rates in colorless optical network units (ONUs) of WDM passive. optical network (WDN-PON). The all-optical equalizers based on Mach-Zehnder interferometer (MZI) and fiber Bragg grating (FBG) are proposed to improve RSOA bandwidth so that to achieve 10 Gbps upstream...
A novel passive optical node with low latency for optical access network (OAN) is proposed, in which the optical circuit just consists of several optical splitters. 1310nm/ 1490nm wavelength division is used in the node. At 1310nm wavelength, any optical network unit (ONU) in one group can transmit the uplink signal to OLT and any ONU in the other group. This realizes communication between two ONUs...
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