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.

Retention of a sub-network connection home path

Abstract: Embodiments of the present invention provide a method and system for reserving a connection's home path resources and restoring the connection on a link that includes a reserved priority bandwidth. A bandwidth advertisement indicating that the reserved priority bandwidth is available is analyzed and a restoration request requesting to route the connection on the link is sent. The reserved priority bandwidth is used to route the connection when the connection has a reserved home path on the link. When the connection has a reserved home path not on the link, a determination is made as to whether a normal priority bandwidth on the link is available and whether the connection is unrestorable on another link. The reserved priority bandwidth is used to temporarily route the connection when normal priority bandwidth on the link is unavailable and the connection is unrestorable on another link.

Optical clock recovery using feedback phase rotator with non-linear compensation

Abstract: A method for clock recovery that may include obtaining an output signal from a phase locked loop (PLL) device. The method may further include determining, using a digital phase detector, the output signal, and a transmitter clock signal, an amount of phase difference between the output signal and the transmitter clock signal. The method may further include filtering, using a phase rotator and a digital accumulator, a portion of the amount of phase difference from the output signal to generate a filtered signal.

Parallel conversion between optical and digital

Abstract: A coherent optical receiver includes an electro-optic module coupled to an electronic signal processing Integrated circuit (IC) via a parallel analog transmission line bus. The electro-optic module 54 receives and detects an optical channel light including a high-bandwidth signal modulated thereon. The electro-optic module 54 includes: a single optical hybrid 22 for mixing the optical channel light with a corresponding continuous wave local oscillator light to generate a mixed light containing the high-bandwidth data signal, at least one photodetector 24; and an analog frequency decimator 62 for generating a set of parallel analog signals, each analog signal representing a respective portion of the high-bandwidth signal. The electronic signal processing IC 58 includes a respective Analog-to-digital (A/D) converter 64 for sampling each one of the set of parallel analog signals, and for generating corresponding parallel digital sample streams; and a digital signal processor (DSP) 28 for processing the parallel digital sample streams to extract the high-bandwidth signal.

Optical amplifier pre-emphasis and equalization method and optical communications system incorporating same

Abstract: The present invention provides an optical amplifier pre-emphasis and equalization method that alleviates the optical amplifier gain ripple penalty experienced in conventional optical communications systems. This method includes storing measured communications channel signal gain ripple information, acquired during factory calibration, in the internal memory of each optical amplifier module. When the optical amplifiers are assembled into a chain, system software retrieves this communications channel signal gain ripple information from each optical amplifier module and computes the pre-emphasis or equalization required for each channel in order to obtain a flat SNR at a receiver. The method also includes measuring the ambient temperature of each optical amplifier module and applying a correction based on the expected change in gain response of each optical amplifier. The method further includes, for Raman amplifiers and the like, applying a fiber type, gain setting, GFF error, etc. correction based on the expected change in gain response of each optical amplifier. The method relies on using VOAs at the sources or DGEs/RBFs in the optical signal path to pre-emphasize or equalize the optical channels.

Systems and methods to detect and propagate UNI operational speed mismatch in ethernet services

Abstract: A method, a network element, and a network operating an Ethernet service include transmitting information related to an operational speed of a first connection to the second switch, wherein the first switch is connected to a first Customer Premises Equipment (CPE) device through the first connection and the second switch is connected to a second CPE device through a second connection; receiving information related to an operational speed of the second connection; and triggering a modification to the Ethernet service, responsive to a mismatch between the operational speed of the first connection and the operational speed of the second connection.