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.

Method of simultaneously polishing a plurality of diverse fiber optic cable connectors

Abstract: A method that mass polishes a variety of fiber optic cable connectors simultaneously. The method includes a plurality of steps for mass polishing of fiber optic cable connectors with varying patterns and loci of motion to prevent overlap of patterns during polishing. Thus, fiber optic cable connectors having a variety of polished end faces may be provided with the apparatus. The method also eliminates the potential for contamination among polishing films, reduces polishing steps, and saves labor and maintenance costs.

Optimum 10-Gb/s NRZ receiver bandwidths for ultradense WDM transmission systems

Abstract: Reports the results of an experimental and numerical simulation study on optimum 10-Gb/s nonreturn-to-zero receiver bandwidths for ultradense wavelength-division-multiplexing (UDWDM) transmission systems. It is found that as channel spacing is scaled down to UDWDM dimensions from 50 to 25 GHz, the,optimum receiver bandwidth increases. Moreover, an UDWDM system with 25-GHz channel spacing offers the opportunity to improve receiver performance by taking advantage of the optical matched filter concept. A 25-GHz channel spacing optical filter, designed to approach the performance of an optical matched filter, shows a /spl sim/1.3 dBQ advantage compared to a 50-GHz channel spacing optical filter when receiver bandwidth is optimized.

Adaptive Ethernet flow control systems and methods

Abstract: A network element implemented method includes receiving an Ethernet connection at a first rate, transmitting the Ethernet connection at a second rate, monitoring a buffer fill associated with the Ethernet connection, and periodically transmitting pause frames to a device associated with the Ethernet connection, wherein the pause frames include a determined optimal pause quanta value based on the first rate, the second rate, and the buffer fill. A network element includes a first port receiving an Ethernet connection at a first rate, a second port transmitting the Ethernet connection at a second rate, and monitor circuitry configured to monitor a buffer fill associated with the Ethernet connection and cause the first port to periodically transmit pause frames, wherein the pause frames include a determined optimal pause quanta value based on the first rate, the second rate, and the buffer fill.

Optical amplifier transient control apparatus

Abstract: An optical amplifier control circuit and method controls transients and avoids the problems associated with measuring gain. The input power level is detected and amplified by a transient control setting to provide a desired gain value against which is compared the output power level. This transient control error may be used in conjunction with a constant power error and/or a constant current error such that the lowest of the error values is used to drive the pump laser. Current and power feedback signals and settings are used to derive the error values. Multiple pump lasers per stage may also be controlled and a multi-stage amp having a cascaded structure may be realized using the inventive techniques.

Automated node level fibre audit

Abstract: A method of automated testing and evaluation of a node of a communications network, the method comprising: a management computer interacting with the node to discover fibre trails within the node that can be safely tested; and the management computer interacting with the node to test at least continuity of each identified fibre trail that can be safely tested