Yingying Bi

First Experimental Demonstration of a Remotely Powered Quasi-Passive Reconfigurable Node

We experimentally demonstrated the first remotely powered quasi-passive reconfigurable (QPAR) node for optical access networks. The node is powered remotely using an optical source, and is designed to provide flexible power/wavelength allocation while keeping optical access networks passive. Using a photodiode (PD) array, two optical latching switches in a 1 × 2 × 2 QPAR (i.e., one wavelength, two power levels, and two output ports) are remotely powered. Both sequential and simultaneous operations have been demonstrated, with the optical feed of each PD being 4 and 9 dBm, respectively. Our bit error rate measurements show that the optical signal used for remote power causes no power penalty to the payload signal when transmitted along the same feeder fiber.

A Novel Quasi-Passive, Software-Defined, and Energy Efficient Optical Access Network for Adaptive Intra-PON Flow Transmission

In this paper, we propose, design, and demonstrate a novel Intra-PON Flow transmission with optical reroute using a Quasi-PAssive Reconfigurable (QPAR) node. The network can be reconfigured adaptively according to the monitored traffic status in a software-defined manner. Simulations show that PON with reroute architecture can achieve ~20% higher network capacity comparing to PON without reroute case with the same traffic waiting time or blocking probability requirement. PON with reroute consistently outperforms PON without reroute configuration with 20% larger throughput and 24% less power consumption with the Intra-PON traffic ratio of 0.3. In addition, adaptive Intra-wavelength assignment with a QPAR node can adapt to the subscription rate growth with time, and provide cost and power savings compared to PON without reroute and fixed PON with reroute architectures by approximately 20% and 10%. Moreover, adaptive Intra-PON architecture with a QPAR node can facilitate efficient multicast transmission for video or file backup among multiple serves located in different access networks, which can provide lower traffic waiting time, 14% power saving, and support roughly 30% higher traffic comparing to the fixed PON with reroute design with a multicast ratio of 0.5.

UltraFlow Access Network With Remotely Powered and Controlled Quasi-Passive Reconfigurable Remote Node

In this paper, we propose an UltraFlow access network enabled by a remotely powered and controlled quasi-passive reconfigurable (QPAR) node. Residing at the remote node (RN), QPAR can dynamically split and route optical channels to any users attached to its outputs, thereby improving bandwidth efficiency and ensuring harmonic coexistence of different network services in the UltraFlow access network. We experimentally demonstrate the proposed UltraFlow access network with a 2 × 4 × 4 QPAR. The QPAR module is powered by a local supercapacitor that is remotely charged by remote laser power. Remote switching control in the QPAR has also been demonstrated with a self-designed control circuit. Scalability of the system is studied in the context of channel power budget and switching control in QPAR. Compared to other RN architectures, QPAR enabled UltraFlow access network uses about 50% less channels on average during low traffic time, and significantly reduces IP service delays in presence of unbalanced IP traffics. Simulation results also indicate that QPAR helps to mitigate the impact of multicast Flow traffic on Flow service delays by a maximum of 90%.

Remotely powered and reconfigured Quasi-Passive Reconfigurable nodes for optical access networks

Quasi-Passive Reconfigurable (QPAR) nodes have been proposed to provide flexible power/wavelength allocation in optical access networks. QPAR only consumes power during reconfiguration, which is remotely transmitted from the central office, thus maintaining the passive nature of the network. In this paper, a QPAR control circuit is designed, and a remotely powered and reconfigured 1 × 2 × 2 QPAR (i.e., one wavelength, two power levels, and two output ports) with a 0.1 F/5V supercapacitor (SC) remotely charged by a 1 × 8 photodiode array is experimentally demonstrated. The charged SC can power the QPAR for at least 6 s with 24 consecutive reconfigurations (200ms each) or two reconfigurations within a maximum period of 40 hours, before the SC needs to be recharged. In addition, the demonstrated QPAR remote power scheme is compared with the previously proposed Direct Photovoltaic Power option both theoretically and experimentally. Results show that the SC based remote power mechanism is capable of driving a large number of reconfigurations simultaneously and it is better for large dimension QPARs.

Quasi-Passive Reconfigurable (QPAR) node enabled software-defined and energy-efficient intra-PON optical Flow transmission

We experimentally demonstrate error-free Intra-PON Flow transmission via a QPAR node. Simulations show Intra-PON outperforms regular PON in waiting time, blocking probability, throughput and energy consumption. Adaptive Intra-PON features up to 20% network cost reduction.

Remotely pumped and high splitting ratio (1:512) intra-PON flow transmission via a distantly powered quasi-passive reconfigurable (QPAR) node

We experimentally demonstrate high splitting ratio (up to 1:512) and adaptive Intra-PON transmission with a remotely pumped EDFA (R-EDFA) and distantly powered QPAR node. 75 dB power budget at BER of 10-3, and 3.5 ms remote switching time are obtained.

Software-defined intra-PON optical flow transmission via a quasi-passive reconfigurable (QPAR) node

This paper demonstrates Intra-PON optical Flow transmission via a QPAR node. Simulations show 2 to 20x traffic waiting time reduction comparing to no or fixed Intra-PON designs. Experiments show error-free Intra- and Inter-traffic with/without QPAR reconfiguration.

QPAR: A Quasi-Passive and Reconfigurable node for green next-generation optical access networks

Passive optical network (PON) is regarded as a promising solution for the broadband bandwidth bottleneck problem. However, due to its passive nature, legacy PON is limited by the static power distribution, which makes it power inefficient. To address this problem, we propose QPAR [4], a Quasi-Passive and Reconfigurable node, which enables dynamic power and wavelength assignment so as to save optical power budget in PON. In this paper, we study the power gains that can be achieved in PON employing QPAR, as well as different factors that may facilitate or prevent real QPAR deployments. We conduct extensive simulations to demonstrate the merits of QPAR. Results show that QPAR can achieve high optical power saving by intelligently redistributing the unnecessary power assigned to “close” optical network units (ONUs) in the network. The saved power can either be used to connect more ONUs, or extend the network reach without increasing the optical power budget.