Optical Transport Network

About: Optical Transport Network is a research topic. Over the lifetime, 6055 publications have been published within this topic receiving 85783 citations.

Method and device for mixing and concourse of multi-service based on all-purpose framing regulations

Abstract: A multiple service mix concourse method based on universal frame forming regulations includes: executing alignment, in-frame and decoding operations to the SONET/SDH service or data service code stream, extracting the service data and caching; circularly enquiring each service duct in sequence, executing velocity regulation to the data required to transmit, and extracting the duct identification information; executing GFP encapsulating operation to the service data stream after packaging, and using the CID in the GFP spreading frame head to differentiate the duct identifications; putting the service data stream after packaging in the net load OPUk of the OPUk, and executing the stuffing of the OTN spending to form the OTN signals; executing frame decoding to the OTN signals for decoding the OPUk net load; de-packaging the GFP to obtain the duct identification and data; outputting the data in the corresponding GFP net load to the service transmission buffer; regenerating the SONET/SDH transmission clock, and transmitting the SONET/SDH service or data services. The invention can realize direct conveying of low speed SONET/SDH service signals in the OTN signals, and fully utilizes the band-width resources.

Routing and time-slot assignment in optical TDM networks

Abstract: Optical time-division multiplexing (O-TDM) networks can provide a finer bandwidth granularity than wavelength-division multiplexing networks, and will play an important role in future all-optical networks. Since optical buffers are expensive, a small buffer size will be the characteristic of O-TDM systems. This paper analyzes the problem of routing and time-slot assignment in O-TDM networks. The results lead to the proposal of a Dijkstra-like shortest-path routing scheme that intends to maximize the performance of an optical network with a small number of optical buffers. Performance evaluation of the proposed scheme is also presented.

Method and a network node for improving bandwidth efficiency in an optical network

Abstract: A method and system are provided for improving bandwidth efficiency in an optical network by dynamically utilizing unused bandwidth located around preliminarily allocated optical channels. The method comprising monitoring actual bandwidth of the preliminarily allocated optical channels incoming to a node of the optical network, reporting the monitoring results to the controller of that node and further to a network controller, receiving at that node recommendations generated by the network controller, adjusting bandwidth of one or more of the allocated optical channels thereby releasing spare bandwidth for inserting one or more additional optical channels thereat.

Fully-Passive Optical Switch Introducing Dynamicity and Flexibility to Metro-Access

Abstract: We experimentally demonstrate a tool for dynamic reconfigurability at the physical layer infrastructure through optically powered switches based on micro-opto-electro-mechanical system technology. Energy scavenging at the optical network layer is exploited to feed this switching element. Up to 13 consecutive switching operations are shown for a full energy reservoir in addition to endless continuous switching operation with a recharge time of 24 s between operations for an optical feed of 6 dBm. A fast switching mode with 120 ms is also supported. Crosstalk robustness, penalty-free switching, and compatibility with reflective networking schemes are achieved and guarantee scalable node technology that is, from a network point-of-view, fully passive.

Explore Maximal Potential Capacity of WDM Optical Networks Using Time Domain Hybrid Modulation Technique

Abstract: The recent emerging time domain hybrid modulation (TDHM) technique is considered promising because it can realize continuous adaptation between spectral efficiency and transparent reach through appropriately allocating the time slot occupancy ratios of different modulation formats in a time-division multiplexing (TDM) frame. This technique is expected to achieve more efficient spectrum utilization or higher transmission capacity than the traditional transmission technique based on discrete modulation formats. For the point-to-point transmission system, the benefit of the TDHM technique has been experimentally verified. However, its benefit from the whole network perspective has not been explored yet. In this paper, we apply the TDHM technique to the optical network to maximize its transmission capacity. To evaluate the benefit of this technique, we consider the routing and wavelength assignment problem for the TDHM-based WDM network, for which we develop an integer linear programming model and a waveplane-based heuristic algorithm to maximize the total network transmission capacity for the cases with and without network protection. For the protection case, the shared backup path protection technique is employed owing to its efficiency of spare capacity sharing and simplicity in network operation. The simulation study shows that compared to the design with discrete modulation formats, the TDHM-based approach can significantly increase the network transmission capacity.