Siemens Aktiengesellschaft

Other

Detlef Stoll

Harald Bock

Patrick Leisching

Alexander Richter

Gerhard Stortz

Hubert Jaeger

Hubert Jäger

Christian Scheerer

Juergen Heiles

Reinhard Johannsen

Wilhelm-Martin Plotz

An add-drop multiplexer has a group filter that divides an incoming WDM signal into several channel groups of corresponding adjacent WDM channels. A reconfiguration module is connected to each channel group. A first type of module makes it possible to perform a manual configuration of the Add-Drop channels and the coupled WDM channel while a second type of module makes it possible to carry out remote configuration. A fourth type of module enables remote configuration of the drop-continue channels.

Add-drop-multiplexer and optical wavelength division multiplex transmission system

A tunable add/drop&continue or drop&continue module comprises two optical filters where at least one is tunable and that are arranged following one another between a branching unit for optical signals and an insertion unit follow a branching unit for optical signals. The reflection attenuation of the one tunable optical filter is lower and the transmission attenuation higher than that of the other optical filter, as a result of which the drop&continue function of the module can be realized without high circuit-oriented expense.

Add/drop-drop and continue-module and drop and continue module

The present invention relates to a network node that includes optical add/drop modules such that a module can be exchanged without disruption of the connections.

Network nodes with optical add/drop modules

An optical filter, adjustable add-drop-continue module and circuit for bundled cross-connect functionality, wherein the transmission response of the optical filter is varied by changing its temperature, tuning of the filter can be carried out by mechanical pressure or tension, the filter can be used to produce add-drop-continue modules which are suitable both for add-drop operation and for drop-continue operation, and cross-connect modules can be constructed from the optical filters.

Optical filter, adjustable add-drop-continue module and circuit for bundled cross-connection functionality

An optical network node is provided having add-drop and/or cross-connect functions, wherein the optical network node includes a first optical line with a first drop branch and a first add branch, and a second optical line with a second drop branch and a second add branch, wherein the first drop branch and the second drop branch are in each case connected to a first cross-connect and to a second cross-connect, the first add branch is connected to the first cross-connect and to the second cross-connect via a first wavelength converter, and the second add branch is connected to the first cross-connect and to the second cross-connect via a second wavelength converter.

Optical node with add-drop or cross-connect functionality

An optical auxiliary signal, produced in a central device, is transmitted in addition to a user signal from the central to a remote optical device via at least two optical supply line fibers which are provided for transmitting optical signals between the central and remote optical devices. The optical auxiliary signal received in the remote optical device is diverted, is transmitted via a second optical supply line fiber to the central optical device, and the reception or the absence of the optical auxiliary signal and of the optical user signal in the central optical device are evaluated in order to monitor the operational state of the optical supply line fibers.

Method for monitoring the operation of optical supply line fibers

A central equipment is connected by at least two optical fibers to a decentralized optical equipment and the central equipment creates an optical auxiliary signal which is transmitted together with an optical payload signal from the central equipment to the decentralized equipment. The optical auxiliary signal that is received in the decentralized optical equipment is rerouted and transmitted back to the central optical equipment via another optical fiber in addition to a second payload signal, and the reception of the optical auxiliary signal is optically monitored in the central optical equipment to determine if there is a breakage in either one of the fibers extending to the unit.

Method for monitoring the operation of optical fibers

A circuit arrangement and method for minimizing bit errors, whereby respective corresponding bits of a bit sequence are compared to a corrected bit sequence or to an error signal and, given non-coincidence, the neighboring bits of the corrected bit sequence are utilized for correction of a decision criterion formed from the sampling time and a threshold.

Circuit arrangement and method for minimizing bit errors

In an optical plug-type connection between two optical conductors having an optical terminal which receives an optical plug-type member, an electrical connection is provided for verifying that the optical plug-type connection has been made and/or released. This verification reduces the likelihood of an optical plug-type connection being erroneously acquired in the network management system and, thus, significantly reduces problems in locating errors in the optical communication system.

Growing community of inventors

Boca Raton, FL, United States of America

Detlef Stoll