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.

Wavelength routing based on physical impairments

Abstract: A set of guidelines for routing wavelengths in switched optical networks that is based on physical constraints is presented. Impact on signaling protocols is also discussed. One may still choose to break down the automatically switched optical network (ASON) into multiple sub-networks, but the choice will now be based on administrative or business considerations rather than physical constraints. Hence, we shall concentrate on the methods that may be employed in estimating the quality of service for a transparent wavelength connection through such an ASON.

Hybrid optical switching for data center networks

Abstract: Current data centers networks rely on electronic switching and point-to-point interconnects When considering future data center requirements, these solutions will raise issues in terms of flexibility, scalability, performance, and energy consumption For this reason several optical switched interconnects, which make use of optical switches and wavelength division multiplexing (WDM), have been recently proposed However, the solutions proposed so far suffer from low flexibility and are not able to provide service differentiation In this paper we introduce a novel data center network based on hybrid optical switching (HOS) HOS combines optical circuit, burst, and packet switching on the same network In this way different data center applications can be mapped to the optical transport mechanism that best suits their traffic characteristics Furthermore, the proposed HOS network achieves high transmission efficiency and reduced energy consumption by using two parallel optical switches We consider the architectures of both a traditional data center network and the proposed HOS network and present a combined analytical and simulation approach for their performance and energy consumption evaluation We demonstrate that the proposed HOS data center network achieves high performance and flexibility while considerably reducing the energy consumption of current solutions

Optical transport network design beyond 100 Gbaud [Invited]

Abstract: Optical line interface technology has been the key enabler to reduce the cost per bit transported, thus cost-effectively scaling optical transport networks and mitigating or even avoiding the need to roll out or lease additional optical fibers. However, this technology is reaching fundamental limits, hampering the expectation of significant gains in spectral efficiency in the foreseeable future. State-of-the-art line interfaces already exploit symbol rates that are roughly twice those available with the preceding generations to increase per-channel capacity, and this trend is likely to continue. In the short term, harvesting the benefits of introducing these interfaces mostly depends on the installed reconfigurable optical add/drop multiplexer infrastructure. In the longer term, the impact of further increases in the symbol rate also depends on the evolution of the dominant client data rates and on the channel format selection strategies. Considering a reference transport network and extrapolating how client traffic rates and line interface baud rates will evolve, this work presents a preliminary assessment of the potential benefits and shortcomings of state-of-the-art and future generations of line interfaces.

Method and apparatus for mapping and de-mapping in an optical transport network

Abstract: The embodiments of the present invention disclose method and apparatus for mapping and de-mapping in an optical transport network, where the mapping method includes: constructing an Optical Channel Data Tributary Unit (ODTU) according to an amount M of time slots of a High Order Optical Channel Payload Unit (HO OPU) to be occupied by a Low Order Optical Channel Data Unit (LO ODU); mapping the LO ODU to a payload area of the ODTU in a M-byte granularity; encapsulating overhead information to the payload area of the ODTU; and multiplexing the ODTU, which has been mapped the LO ODU and encapsulated with the overhead information, to the HO OPU, so as to provide a high-efficient and universal mode for mapping the LO ODU to the HO OPU.

Free-space optical network with agile beam-based protection switching

Abstract: A system includes a network having multiple network nodes (102-110) each configured for free-space optical communication. Each network node includes one or more apertures through which optical beams are transmitted and received over optical links (112). The optical links include (i) a traffic link (112a) that transports higher-rate traffic between nodes and (ii) an acquisition/tracking link (112b) that transports lower-rate signals used to establish and maintain location knowledge of other nodes. Each network node also includes a network processor configured to determine one or more backup paths through the network. Each network node further includes a beam steering unit (420) configured to redirect an optical beam from the traffic link onto the acquisition/tracking link to create a backup traffic link.