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.

Bidirectional wdm add/drop multiplexer and bidirectional wdm optical transmission system having the same

Abstract: A WDM optical transmission system with a bi-directional WDM-ADM is disclosed. The system includes first and second transceivers for multiplexing a multi-channel optical signal before transmission and for de-multiplexing a received multi-channel optical signal; and, a bi-directional WDM-ADM for interleaving the channels of an optical signal received from the first transceiver and the channels of an optical signal received from a second transceiver, for adding/dropping the interleaved optical signals according to channels, for de-interleaving the added/dropped optical signals into a first optical signal and a second optical signal, and for providing the first and the second optical signals to the first and second transceivers, respectively.

Wavelength division multiplexing passive optical network architecture with source-free optical network units

Abstract: An optical system and method includes a source-free optical network unit coupled to an optical fiber for receiving an original carrier signal with downstream data over the optical fiber. The optical network unit includes a modulator configured to remodulate the original carrier signal with upstream data to produce an upstream data signal for transmission back down the optical fiber in a direction opposite to a direction in which that original carrier signal was received.

Method for transmitting low-speed service signal in OTN

Abstract: The invention relates to a method to transmit low-speed data business and support opposite mapping, multiplexing and high-efficiency transmission and realize end-to-end management and maintenance in OTN for low-speed data business without adding complexity comprises: defining optical channel data unit frame format, bearing speed, overhead zone structure and structure to regulate overhead for low-speed data business, dividing the payload zone of payload unit in higher-order optical channel into a plurality of time-slot channels to bear data unit of low-speed optical channel branch with byte intervening means, using multiplexing frame indication mechanism to allocate optical channel branch data unit and regulate overhead, and bearing signal information of bear business on time-slot channel to realize the opposite unit payload mapping.

Framework for MPLS-based control of optical SDH/SONET networks

Abstract: The suite of protocols that defines multiprotocol label switching is in the process of enhancement to generalize its applicability to the control of optical networks. One area of prime consideration is to use these generalized MPLS protocols in upgrading the control plane of optical transport networks. This article describes those extensions to MPLS directed toward controlling SDH/SONET networks. SDH/SONET networks are ideal candidates for this process since they possess a rich multiplex structure, and a variety of protection/restoration options are well defined and widely deployed. We discuss the extensions to MPLS routing protocols to disseminate information needed for transport path computation and network operations and the extensions to MPLS label distribution protocols needed for provisioning of transport circuits.

Physical layer security in fiber-optic networks using optical signal processing

Abstract: Using optical processing techniques, we experimentally enhance the physical layer security of optical communication systems. We exploit optical encryption using fiber nonlinearity to achieve real time data encryption. By implementing interleaved waveband switching modulation and variable two-code keying to the system, the security of the data is further enhanced. Based on spread spectrum, we also demonstrate optical steganography such that the stealth signal is transmitted underneath system noise. Optical steganography in WDM and optical CDMA systems is experimentally demonstrated. We also propose and study optical CDMA-based backup channels that improve service availability without wasting the bandwidth in the backup channel. The multi-layered security provided improves the confidentiality and availability of the network.