Abstract
A full-duplex self-recovery optical fibre transport system is proposed on the basis of a novel passive single-line bidirectional optical add/drop multiplexer (SBOADM). This system aims to achieve an access network with low complexity and network protection capability. Polarisation division multiplexing technique, optical double-frequency application and wavelength reuse method are also employed in the transport system to improve wavelength utilisation efficiency and achieve colourless optical network unit. When the network comprises a hybrid tree–ring topology, the downstream signals can be bidirectionally transmitted and the upstream signals can continuously be sent back to the central office in the reverse pathways due to the remarkable routing function of the SBOADM. Thus, no complicated optical multiplexer/de-multiplexer components or massive optical switches are required in the transport system. If a fibre link failure occurs in the ring topology, then the blocked network connections can be recovered by switching only a single optical switch preinstalled in the remote node. Simulation results show that the proposed architecture can recover the network function effectively and provide identical transmission performance to overcome the impact of a breakpoint in the network. The proposed transport system presents remarkable flexibility and convenience in expandability and breakpoint self-recovery.
Highlights
Under the rapid development of various industry and multimedia applications, a broadband network is an essential tool for emerging artificial Internet of thing applications, intelligent houses/offices/factories and smart sensing and detection systems [1]
The λ1 and λ2 can still be observed because the fibre Bragg gratings (FBGs) employed in each single-line bidirectional optical add/drop multiplexer (SBOADM) are imperfect
A full-duplex self-recovery optical fibre transport system based on a passive SBOADM is proposed in this study
Summary
Under the rapid development of various industry and multimedia applications, a broadband network is an essential tool for emerging artificial Internet of thing applications, intelligent houses/offices/factories and smart sensing and detection systems [1]. Optical fibre access networks, such as time-division multiplexing (TDM) [3]–[6] or wavelength division multiplexing (WDM) [7]–[12] systems Such configuration increases the costs of network construction and complicates the network operation. The first type of BOADM structure includes the basic optical add/drop multiplexers (OADM) and OSs [13], [14]. Such BOADM can achieve bidirectional transmission in a ring topology optical network. To reduce the overall construction cost by taking off backup fibre link, some researchers develop single-wire BOADMs based on OSs, multiplexers and de-multiplexers [15]. The network manager needs a complicated strategy to manage the status of OSs inside each BOADM to reset the routeing pathway of data transmission dynamically during fibre link failure in the network
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