We present a scalable and novel modular optical metro core node architecture and low cost metro access node architectures with edge computing functionalities employing photonic WDM integrated switches. Photonic integrated switches has been des igned as the building blocks to realize the modular metro node architectures, namely photonic WDM switches with express and add/drop ports, photonic integrated WSS aggregation/disaggregation functions for merging/dropping the network traffic, and photonic integrated multi-cast switch (MCS), as well as bandwidth variable transceivers aggregators to achieve multi-Terabits/second operation. Moreover, a dynamic re-configurable metro-access nodes based on low-cost 2-degree photonic integrated mini-ROADMs will be discussed. The lossless photonic WDM switches are based on InP technology and employ semiconductor optical amplifiers as on-chip gain element and fast switch. The photonic WDM circuits allows to switch multiple format data signals in wavelength, space, an d time for full flexibility, scalability of the interconnected network elements as well as capacity. Applications to data center interconnects and 5G will be discussed and experimental results reported.
In this paper, we propose and experimentally demonstrate a multiuser wavelength-division-multiplexing passive optical network (WDM-PON) system combining with orthogonal frequency division multiple (OFDM) technique. A tunable multiwavelength optical comb (MOC) is designed to supply flat optical lines for assisting the configuration of the proposed multiple source-free optical network units enhanced WDM-OFDM-PON system. Schematized by cascading a phase modulator and an intensity modulator with a recirculation loop, the MOC can output 29 ideal channel optical comb lines with the flatness of 0.85 dB. For the MOC enabled WDM-OFDM-PON system, source-free and interference-free multiuser upstream transmission over a single fiber can be efficiently supported, while downstream transmission channels can convey the baseband data stream and radio frequency OFDM signals simultaneously so that the proposed system can be connected to wire-line users and wireless users simultaneously.
Electrical switching based data center networks have an intrinsic bandwidth bottleneck and, require inefficient and power-consuming multi-tier switching layers to cope with the rapid growing traffic in data centers. With the benefits of ultra-large bandwidth, high-efficient cost and power consumption, switching traffic in the optical domain has been investigated to replace the electrical switches inside data center networks. However, the deployment of nanosecond optical switches remains a challenge due to the lack of corresponding nanosecond switch control, the lack of optical buffers for packet contention, and the requirement of nanosecond clock and data recovery. In this work, a nanosecond optical switching and control system has been experimentally demonstrated to enable an optically switched data center network with 43.4 nanosecond switching and control capability and with packet contention resolution as well as 3.1 nanosecond clock and data recovery.
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