Avanex Corporation

Other

Avamex Corporation

Lintao Zhang

Guohua Xiao

Charles Mao

Xiaofan Cao

Xiaoping Charles Mao

Gang Li

Xiaodong Duan

Simon Xiaofan Cao

Jialing Yang

Jin Xie

Paul Hull

Dongqi Liu

Xiofan Cao

A self-adjusting optical add-drop multiplexer monitors the power in a drop signal and attenuates the power in an add signal to match the power in express WDM channels (signals). When used in a fiber network, and more particularly, in a metro network, the deleterious effects of optical amplification are reduced. Power attenuation is also used in an optical switching assembly particularly useful in two-fiber ring network. The optical switching assembly monitors drop channels from the two rings of the network and attenuates the add channel(s) accordingly. An optical switch operates to direct the drop signal from one of the two rings to a receiver in accordance with a control signal based on the monitored drop channels. The self-adjusting optical add-drop multiplexer also monitors the power in the drop signals and issues an alarm if the drop signal is of a power level above or below predetermined levels.

Self-adjusting optical add-drop multiplexer and optical networks using same

An optical reconfigurable service ring (RSR) architecture based on a RSR channel and WDM channel plan matrix, and method for operation in a fiber network that provides WDM wavelength networking functionalities such as provisional wavelength services, optical circuit switching, optical layerpacket switching, optical storage switching, and optical layerpacket routing, are proposed. In one embodiment, sixteen wavelength are dynamically switching, routed, or distributed among five optical add/drop nodes using narrowly wavelength tunable transmitters and fixed optical add/drop multiplexer modules.

Reconfigurable service ring and method for operation in optical networks

An optical node and method for operation in an ultra long haul backbone network that provides DWDM optical transmission and wavelength networking functionalities are disclosed. The optical node is designed with capabilities for amplification, dispersion compensation, and add/drop functionalities. In one embodiment, three erbium-doped fiber amplifier (EDFA) are cascaded using low nonlinearity and low loss dispersion compensating module (DCM).

Optical node including three-stage optical amplifier with automatic gain and level control

The present invention provides a hybrid Raman/EDFA optical amplifier that utilizes a first optical detector that generates a first electrical or electronic signal that is proportional the combined optical power of the signal light and the leaked pump laser light, a second optical detector that generates a second electrical or electronic signal that is proportional to the power of the pump laser light and an electronic subtraction circuit that receives the first and second electrical or electronic signals and generates a difference signal that is proportional to only to the optical power of the signal light and insensitive to the power of the Raman pump laser light. The difference signal is utilized by an EDFA control circuit to control and/or adjust the operation of the EDFA based upon changes in the power of the input optical signal.

Apparatus and method for channel monitoring in a hybrid distributed Raman/EDFA optical amplifier

A reconfigurable AGC loop design for an optical amplifier with a software provisional switch in the AGC loop inside the optical amplifier is disclosed. On the input side, there is a 1&times;m switch for switching a first input to the input of an optical amplifier, or to route other external pins to the optical amplifier. On the output side, there is a 1&times;n switch for switching a first output to the output of an optical amplifier, or to route other external pins to the optical amplifier. The AGC loop inside an optical amplifier is available to operate with other external signals. This reconfigurability unleashes the AGC loop capability that is traditionally confined to individual optical amplifier, provides flexibility, and greatly simplifies the design of optical node.

Reconfigurable automatic gain control and method for optical amplifier

Growing community of inventors

Richardson, TX, United States of America

Lintao Zhang