Abstract: Provided is a network node for a coherent optical wavelength division multiplex (WDM) transmission network including at least one remote port which is adapted to receive from and/or output to neighboring network nodes an optical WDM signal including one or more optical channel signals each lying within an optical channel of an optical WDM transmission band and a predetermined number N of local ports, each local port being adapted to receive from a dedicated coherent optical transmitter an optical add channel signal which is to be integrated in an optical WDM signal that is output at a remote port and/or each local port being adapted to output to a respective dedicated optical receiver an optical drop channel signal.

Abstract: An apparatus for management of a spectral capacity of a wavelength division multiplexing, WDM, system includes at least one pair of transmission fibers provided for transporting optical signals. Each transmission fiber of a transmission fiber pair is connected to a first port of an optical circulator having at least two additional ports and adapted to transmit an incoming optical signal entering one of its ports via its next port. WDM subsystems configured with counter-propagating assignable wavelengths are connected to associated ports of the optical circulator of the apparatus.

Abstract: The invention relates to a method for migrating data traffic from an existing optical WDM transmission system to a new optical WDM transmission system, the existing optical WDM transmission system using a first optical transmission band and the new optical WDM transmission system being capable of using a second optical transmission band. The second optical transmission band at least partially includes the first optical transmission band and a further extension band that does not overlap with the first optical transmission band, the method including the steps of. According to the invention, a migration filter device is used in order to connect, during a migration phase, the network nodes of the existing system and the network nodes of the new system to the network paths that have been used by the existing system. During the migration phase, both systems are operated in parallel, with the new system using the extension band only.

Abstract: The invention relates to a method for migrating data traffic from an existing optical WDM transmission system to a new optical WDM transmission system, the existing optical WDM transmission system using a first optical transmission band and the new optical WDM transmission system being capable of using a second optical transmission band. The second optical transmission band at least partially includes the first optical transmission band and a further extension band that does not overlap with the first optical transmission band, the method including the steps of. According to the invention, a migration filter device is used in order to connect, during a migration phase, the network nodes of the existing system and the network nodes of the new system to the network paths that have been used by the existing system. During the migration phase, both systems are operated in parallel, with the new system using the extension band only.

Abstract: An apparatus for management of a spectral capacity of a wavelength division multiplexing, WDM, system includes at least one pair of transmission fibers provided for transporting optical signals. Each transmission fiber of a transmission fiber pair is connected to a first port of an optical circulator having at least two additional ports and adapted to transmit an incoming optical signal entering one of its ports via its next port. WDM subsystems configured with counter-propagating assignable wavelengths are connected to associated ports of the optical circulator of the apparatus.

Abstract: Provided is an optical network system and optical network unit (ONU) structure enabling a passive optical access network having a meshed structure with at least two central nodes and plurality of ONUs. One embodiment employs a partially or fully meshed structure of optical fibers between customer locations and multiple optical line terminal (OLT) locations creating a passive optical access network. The ONUs can communicate with a neighboring OLT or ONU using a symmetrical or asymmetrical TDM scheme, and convert between the different TDM schemes. For this purpose, the ONU structure includes two transceiver units, one connected to the western network port and the other to the eastern. The ONU can establish communication between either network port and a further ONU or an OLT, with the ONU controller adapted for passing through data, and converting TDM schemes.

Abstract: A remote node architecture for a fiber-optic network, especially for low bit-rate data transmission, the fiber-optic network architecture comprises a central node and a plurality of remote nodes serially connected to each other or to the central node, respectively. The central node and the remote nodes are capable of communicating by means of digital optical signals created by the central node or a respective remote node, each digital optical signal comprising a data frame. The remote node comprises an optical connection network, a single transceiver device comprising an optical receiver unit and an optical transmitter unit, and an electronic controller device for controlling the transceiver device. The optical connection network defines a western optical connection port, an eastern optical connection port, an internal optical receiving port being connected to the optical receiver unit and an internal optical transmitting port being connected to the optical transmitter unit.

Abstract: The invention refers to a optical communication network comprising a monitoring node having a port for outputting at least one optical signal that has a first wavelength range over an optical link of the network to a reflector node of the network. In order to allow for efficient monitoring the optical link it is suggested that the reflector node comprises a wavelength selective optical reflector connected to the link, the reflector being configured for generating a monitoring signal by reflecting a part of the optical signal back into the link, the monitoring signal having a second wavelength range that is a proper sub-range of the first wavelength range and the monitoring node comprises a detector coupled with the port for determining whether the link is defective arranged for detecting the monitoring signal generated by the reflector node.

Abstract: The invention pertains to a mobile terminal for servicing a telecommunication system, wherein the telecommunication system comprises a system controller and at least one module and/or at least one interface port (that is externally accessible in the inserted state of the module), wherein the mobile terminal features an identification device in order to identify a module or an interface port. The invention further pertains to a utilization of such a mobile terminal, as well as an arrangement consisting of a telecommunication system and such a mobile terminal.

Abstract: The invention relates to a network comprising at least one host device having an interface card connected to a backplane of said host device, wherein said interface card comprises at least one cage for receiving a pluggable module which performs a traffic management of data transported via at least one optical fiber connected to said pluggable module.

Abstract: A network comprising at least one host device having an interface card connected to a backplane of said host device, wherein said interface card comprises at least one cage for receiving a pluggable module wherein the pluggable module comprises Time Division Multiplexing (TDM) between an optical network interface and an electrical host interface.

Abstract: The invention provides a network and a method for bidirectional transport of data and in particular a pluggable module for bidirectional transport of data via at least one optical fiber between host devices providing an add/drop functionality by means of an integrated bandwidth adaption unit. The network comprises at least one host device having an interface card connected to a backplane of the host device, wherein the interface card comprises at least one cage for receiving a pluggable module which provides the add/drop functionality between an optical interface and the electrical host interface.

Abstract: A remote node architecture for a fiber-optic network, especially for low bit-rate data transmission, the fiber-optic network architecture comprises a central node and a plurality of remote nodes serially connected to each other or to the central node, respectively. The central node and the remote nodes are capable of communicating by means of digital optical signals created by the central node or a respective remote node, each digital optical signal comprising a data frame. The remote node comprises an optical connection network, a single transceiver device comprising an optical receiver unit and an optical transmitter unit, and an electronic controller device for controlling the transceiver device. The optical connection network defines a western optical connection port, an eastern optical connection port, an internal optical receiving port being connected to the optical receiver unit and an internal optical transmitting port being connected to the optical transmitter unit.

Abstract: An optical transceiver unit for an optical WDM transmitting and receiving device is taught, with a transmitting unit to which a data signal can be fed to a specified channel input port of a multiplexer unit, wherein a separate channel wavelength is allocated to each channel input port, and the transmitting unit can be tuned with respect to optical carrier wavelength across a specified range of wavelengths. The transmitting unit is constructed so that, within the specified range of wavelengths, discrete wavelengths can be set that correspond to the channel wavelengths. In tuning mode, the controller unit can drive the transmitting unit so that the possible channel wavelengths are scanned through. The controller unit evaluates the reception signal fed to it from the receiving unit for whether abort criteria for tuning mode have been fulfilled or not, wherein the scanning process is continued until the abort criteria are fulfilled.

Abstract: A network comprising at least one host device having an interface card connected to a backplane of said host device, wherein said interface card comprises at least one cage for receiving a pluggable module which provides at least one embedded communication channel which exchanges performance monitoring data and configuration data between said pluggable module and a far end device.

Abstract: The invention relates to a network comprising at least one host device having an interface card connected to a backplane of said host device, wherein said interface card comprises at least one cage for receiving a pluggable module which performs a traffic management of data transported via at least one optical fiber connected to said pluggable module.

Abstract: The invention relates to a network comprising at least one host device having an interface card connected to a backplane of said host device, wherein said interface card comprises at least one cage for receiving a pluggable module which performs a traffic management of data transported via at least one optical fiber connected to said pluggable module.

Abstract: The present invention encompasses a method for 1+1 protection of an optical transmission path comprising a working path and a protection path that connect a first and second terminal node. In a working mode, an optical transmission signal is transmitted via the working path from the first to the second terminal node. At the second terminal node, the optical transmission signal is split into two optical sub-signals, and one of the optical sub-signals is sent via the protection path to a protection-path connection node as a working-path control signal. In the case of an interruption of the signal transmission via the working path, the protection-path connection node detects the absence of the working-path control signal and switches the system from the working mode to a protection mode in which signal transmission is conducted via a separate protection path.

Abstract: The invention refers to a optical communication network comprising a monitoring node having a port for outputting at least one optical signal that has a first wavelength range over an optical link of the network to a reflector node of the network. In order to allow for efficient monitoring the optical link it is suggested that the reflector node comprises a wavelength selective optical reflector connected to the link, the reflector being configured for generating a monitoring signal by reflecting a part of the optical signal back into the link, the monitoring signal having a second wavelength range that is a proper sub-range of the first wavelength range and the monitoring node comprises a detector coupled with the port for determining whether the link is defective arranged for detecting the monitoring signal generated by the reflector node.

Abstract: Systems and methods for monitoring a data transmission link, especially an optical, bidirectional data transmission link, in which a digital transmit signal is transmitted on a first transmission path from a local end of the data transmission link toward a remote end of the data transmission link. A portion of the power of the transmit signal sent at the local end is transmitted, delayed by a non-zero delay time on a second transmission path as a control signal toward the remote end of the data transmission link. Both signals are received at the remote end and are tested for the presence of events of a predetermined type. A conclusion can be reached on the quality of the transmission link as a function of a time correlation and frequency of the appearance of events in the received transmit signal and in the received control signal.