Abstract: The invention relates to a remote node architecture for a fiber-optic network, especially for low bit-rate data transmission, the fiber-optic network comprising 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 node being 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.

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: An optical access network has a first and a second network-side termination node, the first including a first transceiver arrangement connected to a first optical link, configured to send a first signal to a customer side termination node including a transceiver for receiving the first signal, and the second including a second transceiver arrangement connected to a second optical link and configured for sending a second signal to a transceiver of a customer-side termination node via the second link. The transceiver of the customer side termination node has a loopback element emitting a monitoring signal back to the network side termination nodes. Both network-side termination nodes have a link failure detector receiving the monitoring signal.

Abstract: The present invention embraces an optical wavelength division multiplex (WDM) transmission system, especially a WDM passive optical network, typically including a central node having a first and a second WDM port and a remote node having a first and a second WDM port and a plurality of channel ports, the central node first WDM port being connected to the remote node first WDM port via a bidirectional single-fiber optical working path and the central node second WDM port being connected to the remote node second WDM port via a single-fiber bidirectional optical protection path, and a group of basic optical node units (ONU's) each of which is connected to a respective remote node channel port via a bidirectional optical ONU path, each ONU including an optical receiver for receiving a downstream optical channel signal and an optical tunable transmitter for creating an upstream channel signal.

Abstract: The invention relates to a method of operating an optical transmission system (100a, 100b, 100c), wherein at least one optical data signal is transmitted over an optical transmission link (120), which particularly comprises at least one optical fiber (120a). The inventive method is characterized by modulating (200) said data signal with a test signal (s) having a predetermined modulation frequency fmod to obtain a modulated data signal (Pin), by receiving (210) a reflected portion (Pback) of said modulated data signal (Pin), and by determining (220) a fiber quality measure (a) depending on said received reflected portion (Pback) of said modulated signal (Pin).

Abstract: A system comprises a frame parser and lookup engine operable to receive an incoming data frame, extract control data from payload data in the data frame, and using the control data to access a memory to fetch a plurality of instructions, a destination and tag management module operable to receive the fetched instructions and execute the instructions to transform the data frame control data, and an assemble module operable to assemble the transformed control data and the payload data.

Abstract: The invention relates to an optical network element (100; 300?), particularly optical line terminal, OLT, or remote node, RN, for transmitting and/or receiving data via an optical network (200) that comprises at least one optical fiber link (210), wherein said optical network element (100; 300?) has a primary optical interface (110; 310) configured to be connected with said optical fiber link (210) to transmit and/or receive data to/from said optical network (200). The inventive optical network element (100) is characterized by at least one secondary optical interface (120a, 120b; 320a, 320b) configured to provide optical pump power (PPa, PPb) to at least one further network element (RN5, RN10; RNa, RNr) via a further optical fiber link (220a, 220b; 220g, 220h), preferably a dedicated pump fiber link, thus enabling true scalability of the optical network (200) regarding network size, particularly link length and the number of remote nodes.

Abstract: A network with a network wide extended policy framework comprising: path computation clients (PCCs), associated with at least one local policy enforcement point (PEP); path computation servers (PCSs), associated with at least one policy decision point (PDP). The PEPs and PDPs adapted to exchange attributes determined by at least one PDP. PDPs are adapted to identify network elements network services requiring identical configuration parameters by evaluating parameters advertised in the network and update policy related to identified groups in case of configuration error. Updated policy is distributed by PDP in policy notification to PEPs associated with network elements network services of identified group. The PEPs receiving policy notification comprising updated policy from PDP adapted to translate the updated policy into configuration settings of network elements network services the identified group.

Abstract: A Raman amplifier comprising a gain control unit adapted to control a pump power of an optical pump signal in response to at least one monitored optical feedback signal reflected back from a transmission line fiber connected to said pumped Raman amplifier.

Abstract: A method and apparatus for providing network failure independent links in a multilayer network comprising a client layer and a server layer, wherein each link of said client layer is served by a connection provisioned in said server layer, wherein mutually disjoint paths for said connections which serve links in said client layer that belong to the same predetermined mutually disjoint link group are calculated.

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: In one aspect, the present invention embraces a wavelength locking method for causing a narrow-band wavelength spectrum of an optical transmit signal of an optical transceiver device to track a narrow-band wavelength spectrum of an optical receive signal received by the optical transceiver device Further, the present invention embraces a wavelength lockable optical transceiver device, especially for a passive optical transmission network, using this wavelength locking method.

Abstract: The present invention embraces an optical wavelength division multiplex (WDM) transmission system, especially a WDM passive optical network, typically including a central node having a first and a second WDM port and a remote node having a first and a second WDM port and a plurality of channel ports, the central node first WDM port being connected to the remote node first WDM port via a bidirectional single-fiber optical working path and the central node second WDM port being connected to the remote node second WDM port via a single-fiber bidirectional optical protection path, and a group of basic optical node units (ONU's) each of which is connected to a respective remote node channel port via a bidirectional optical ONU path, each ONU including an optical receiver for receiving a downstream optical channel signal and an optical tunable transmitter for creating an upstream channel signal.

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: A method for automatic confirmation of an optical network element optical modules each having multiple fibres; a fibre shuffle interconnector having ports to which said optical modules are connected; and a configuration unit which performs an automatic configuration of said optical network element by controlling all optical modules connected to said fibre shuffle interconnector to transmit a fibre identifier associated with a fibre of the respective optical module to the respective port of said fibre shuffle interconnector to which said optical module is connected, wherein said fibre shuffle interconnector forwards the received fibre identifier via another port of said fibre shuffle interconnector to another optical module of said optical network element which detects said forwarded fibre identifier being monitored by said configuration unit to generate a connectivity matrix indicating the connection of said optical modules to said fibre shuffle interconnector on the basis of the detected fibre identifiers.

Abstract: A network node of a synchronous network, wherein said network node comprises a timing circuit which recovers a reference clock from a reception signal received by said network node from an upstream network node of said synchronous network and uses the recovered reference clock for a transmission signal transmitted by said network node to a downstream network node of said synchronous network; and a clock stability monitoring circuit which monitors internal control parameters (CP) of said timing circuit to detect an instability of the reference clock distributed within said synchronous network.

Abstract: A time aware device for a packet switched network comprising at least one time tag processing unit adapted to process time tag data of a predetermined time tag data field (TTDF) provided within a header of a tagged data packet (TDP) transported in said packet switched network to provide time related information reflecting a delay undergone by said tagged data packet (TDP) during its transport in said packet switched network.

Abstract: Disclosed are a device and a method for transmitting an optical data signal over an optical transmission channel, comprising a differential phase shift keying unit for differential phase shift keying of at least one serial data stream to generate a differential phase shift keying coded data stream; an amplitude shift keying unit for amplitude coding of at least two further serial data streams that can be selectively activated to generate an amplitude shift keying coded data stream; and a modulation unit for generating an optical data signal in accordance with a control signal that is, formed from the generated differential phase shift keying coded data stream and from the generated amplitude shift keying coded data stream.

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 method and an arrangement for measuring power for an optical user signal transmitted via an optical fiber by converting the transmitted optical user signal into a pulsed optical measurement signal, the pulse repetition rate of which is dependent on the power of the transmitted optical user signal, and evaluating the pulse repetition rate of the converted optical measurement signal in order to ascertain the power of the optical user signal transmitted via the optical fiber.