Ciena

About: Ciena is a company organization based out in Hanover, Maryland, United States. It is known for research contribution in the topics: Signal & Node (networking). The organization has 1259 authors who have published 1557 publications receiving 25989 citations.

Systems and methods for modular deployment and upgrade of multiple optical spectrum bands in optical transmission systems

Abstract: An optical node supporting a modular deployment and upgrade of optical spectrum includes one or more C+L-Band amplifier modules; and a modular base module configured to interface one or more C-Band optical modems; wherein, in an initial deployment configuration, the modular base module provides channelized Amplified Spontaneous Emission (ASE) loading for select channels in the C-Band via a first ASE noise source coupled to a multiplexer for the C-Band, bulk ASE loading over the L-Band via a second ASE noise source coupled to an L-Band output, and an upgrade port for connection to an L-Band upgrade module The L-Band upgrade module can selectively connect to the upgrade port to provide an L-Band upgrade configuration where the L-Band upgrade module and the modular base module coordinate transition of the bulk ASE loading to L-Band channelized ASE loading via a third ASE noise source

Clock recovery with channel coefficients

Abstract: In a coherent optical receiver of an optical communications network, a method of recovering a clock signal from a high speed optical signal received through an optical link. A set of compensation vectors are adaptively computed for compensating Inter-symbol Interference (ISI) due to at least polarization impairments of the optical signal. A channel delay is estimated based on the computed compensation vectors. The estimated channel delay is subtracted from the computed compensation vectors to generate corresponding modified compensation vectors. Finally, the modified compensation vectors are used to derive a recovered clock signal.

Ethernet facility and equipment protection

Abstract: Described is a system and method of protection switching in an Ethernet network. First and second point-to-point Ethernet links are established to data equipment. Identical streams of Ethernet traffic are received at a first Ethernet port and at a second Ethernet port. The stream of Ethernet traffic being received at the first Ethernet port is transmitted to the data equipment over the first point-to-point Ethernet link, while the second Ethernet port is prevented from transmitting the stream of Ethernet traffic received at the second Ethernet port. During a protection switch, transmission of Ethernet traffic ceases over the first point-to-point Ethernet link, and commences over the second point-to-point Ethernet link, the second Ethernet port transmitting the stream of Ethernet traffic being received at the second Ethernet port to the data equipment.

Fiber optic cable management system

Abstract: A fiber optic cable management system that may be provided in a bay (or shelf) of an optical communications housing. The fiber optic cable management system includes at least one and preferably several interconnecting fiber optic cable guides. Each fiber optic cable guide includes a radius limiting portion that prevents fiber optic cables from being bent beyond their minimum bend radii. The radius of the radius limiting portion of each guide controls the spacing between a specific guide and its adjacent, interconnecting fiber optic cable guides. The width and height of each fiber optic cable guide may be varied depending upon the optical communications system into which the fiber optic cable management system is utilized. The interconnecting fiber optic cable guides may be easily disconnected from each other to allow the fiber optic cable guides to be used in different quantities. This allows an installer to customize the fiber optic cable management system to match the optical communications equipment.

Joint Pre-Compensation and Selective Post-Compensation for Fiber Nonlinearities

Abstract: By jointly using perturbation-based nonlinear pre-compensation and selective decision-aided perturbation-based nonlinear post-compensation, a reduction in the effective number of summation terms by a factor of about 4 is achieved for a 128 Gb/s dual polarization 16-ary quadrature amplitude modulation signal with essentially no degradation in performance. A transmission distance of 4800 km is achieved for a single channel system and a distance of 3000 km is achieved for the center channel in a nine-channel dense wavelength-division-multiplexing (DWDM) system with a channel spacing of 25 GHz.