Siemens Aktiengesellschaft

Other

Patrick Leisching

Detlef Stoll

Harald Bock

Alexander Richter

Hubert Jäger

Christian Scheerer

Juergen Heiles

Hubert Jaeger

Gerhard Stortz

Christian D&ouml;bler

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 add/drop apparatus and method wherein add/drop modules are designed into an optical add drop multiplexer such that channels are added/dropped without resorting to regeneration, with optical signals being routed into the add portion of the module which are not as dispersed as those optical signals being dropped, such that dispersion is compensated for while signal routing is facilitated.

Optical add drop and dispersion compensation apparatus

In a first ADD-DROP module, a WDM signal is supplied to a first filter arrangement which selects two channels and supplies the remaining channels to a cascading switching device. The channels selected by the first filter device can be dropped by an ADD-DROP switching device or switched through the module. The ADD channels switched through or newly added are combined with the remaining channels in an ADD filter arrangement to form a newly configured WDM output signal. A further ADD-DROP module (M ) which allows two further channels to be dropped and added can be connected, in turn, via cascading terminals.

Optical ADD-DROP module which can be expanded modularly

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.

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Munich, Germany

Patrick Leisching