Flexible ring-tree TWDM network architecture for next generation optical access network

Hu, Xintian; Chen, Xue; Zhang, Zhiguo; Wang, Liqian; Bei, Jinsong

doi:10.1109/wocc.2014.6839932

Cited by 6 publications

(1 citation statement)

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“…Nevertheless, a traditional OADM can only direct and route the downstream and upstream optical signals in the same direction of the ring-fiber link. Additional optical switches (SWs) are required to be embedded into each OADM node to form a bidirectional OADM (BOADM) and a spare ring-fiber link is necessary to achieve self-disconnection repair capabilities [23,24]. If the abovementioned two-wire BOADM can be changed to a single-line BOADM (SBOADM), then the entire ring network architecture only requires a single fiber ring structure to achieve the same self-disconnection protection effect.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Ring- and Tree-Topology RoF Transmission System with Disconnection Protection

Chang

Lin

2021

Photonics

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This paper proposes a hybrid ring- and tree-topology radio over fiber (RoF) transmission system with self-disconnection protection that can support the high distribution density of base stations (BSs) in a metropolitan area and strengthen the network quality of service through self-disconnection protection. The number of supportable BS in the system can be increased significantly by integrating the time- and wavelength-division multiplexing techniques and properly utilizing a new-generation single-line bidirectional add/drop multiplexer (SBOADM) into the proposed system. Moreover, when the ring–fiber link of the system is interrupted for any reason, the system operator can recover the broken connections quickly only by transforming an optical switch state at the CO end to allow the downlink optical signals to transmit along the clockwise and counterclockwise directions of the ring–fiber link simultaneously. In this case, the downstream optical signals can be delivered to each set of BS-groups through the two-way transmission characteristics of the SBOADM automatically, and the uplink optical signals, originally, from each set of BS-groups can be transmitted back to the CO end along the opposite direction of the downlink signal-routing path. In this way, the interference caused by fiber breakage can be avoided immediately, and the entire transport system can be reconnected to ensure the quality of network services. Our experimental results prove that the overall transmission performances are similar to those under normal circumstances.

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Section: Introductionmentioning

confidence: 99%