Alcatel Lucent

Alcatel

Alcatel N.v.

Alcatel Sel Aktiengesellschaft

Alcaltel Lucent

Nokia Solutions and Networks Oy

Harald Schmuck

Jörg Hehmann

Michael Straub

Thomas Pfeiffer

Rene Bonk

Heinz-Georg Krimmel

Henning B&uuml;low

Wolfgang Poehlmann

Robert Borkowski

Joerg Hehmann

Lothar Jentsch

Rolf Hofstetter

Benian Hiba

Heinz Krimmel

Proposed is an OLT for a passive optical wavelength division multiplex network. The network contains optical transmitters for generating downstream signals of an L-Band, as well as optical receivers for receiving upstream signals of a C-Band. Furthermore, the OLT contains a bi-directional SOA and an optical interface. The optical interface, the SOA, the transmitters and the receivers are optically coupled such that an upstream signal received at the optical interface is firstly provided to the bi-directional SOA and subsequently from the SOA to one of the receivers, and such that a downstream signal generated by one of the transmitters is firstly provided to the bi-directional SOA and then subsequently to the optical interface. The bi-directional SOA has a gain function that is not constant with respect to a wavelength of an optical signal to be amplified. Furthermore, the gain function is maximal for a wavelength located within the C-band.

Optical line terminal for a passive optical wavelength division multiplex network

The invention relates to a method for performing network functions for a subscriber-sided (CPE) network access unit (ONT) in a telecommunication's access network with a central unit (CO, OLT), a distribution network (AN), and a multiple of network-sided network termination units (DPD) with subscriber-sided network access units (ONT) connected or connectable thereto, in which network a bidirectional communication path () is present between the central unit (CO) and that network-sided network termination unit (DPD), to which the subscriber-sided network access unit (ONT) under consideration is connected, in which for performing network functions a further bidirectional communication path () between the subscriber-sided network access unit (ONT) under consideration and the corresponding network-sided network termination unit (DPD) is used in connection with the bidirectional communication path () between the central unit (CO, OLT) and that network-sided network termination unit (DPD), as well as to a telecommunication's access network (FIG.), a central unit (CO, OLT), a network-sided network termination unit (DPD), and a subscriber-sided network access unit (ONT).

Method and apparatuses for performing network functions in a passive optical network

The invention relates to a method for monitoring a passive optical network having a tree-like structure with a main line and a plurality of branches. The method includes transmitting a wake-up signal from an optical line termination (OLT) arranged in the main line to a plurality of monitoring units arranged in the branches. The method also includes detecting the wake-up signal and listening to information requests from the OLT in the monitoring units during a listening time interval after the detection of the wake-up signal. The method further includes transmitting an information request to be received in the listening time interval from the OLT to the monitoring units. The method additionally includes receiving the information request in the monitoring units during the listening time interval, one of the monitoring units which is addressed by the information request transmitting a response message back to the OLT.

Monitoring method for a passive optical network

A method for monitoring a passive optical network (), PON, having a tree-like structure with a main line () and at least two branches (to), comprising: transmitting a wake-up signal () from the main line () to at least two monitoring units (DPMto DPM) arranged in the at least two branches (to), in each of the monitoring units (DPMto DPM), detecting the wake-up signal () and transmitting a response signal (A, B, C) back to the main line (), each of the monitoring units (DPMto DPM) generating a pre-defined time delay (&#x394;tto &#x394;t) between the detection of the wake-up signal () and the start of the transmission of the response signal (A, B, C), and receiving the response signals (A, B, C) at the main line (), the receiving times (Rto R) of the response signals (A, B, C) being different from each other, the difference between the receiving times (Rto R) being adjusted by the pre-defined time delays (&#x394;tto &#x394;t) of the monitoring units (DPMto DPM).

Method for monitoring a passive optical network using monitoring units

An optical network having a tree-like structure with a main line and a plurality of branches, at least two of the branches comprising a monitoring unit for upstream signalling to the main line, wherein each of the monitoring units comprises a signal generation unit with a light source for generation of a pre-defined optical signal, and the monitoring units are construed to generate pre-defined optical signals which are different from each other, as well as a monitoring unit for generating a periodic upstream signal in such an optical network and a method for monitoring such an optical network.

Optical network, monitoring unit and monitoring method

The invention concerns a transceiver module for an optical data network, comprising an optical interface for connection with an optical transmission line and an electrical interface for connection with a host board, wherein the electrical interface is suitable for providing the transceiver module with payload data to be sent on the optical transmission line and for providing the host board with payload data read from the optical transmission line, and further comprising monitoring means for monitoring the optical transmission line, which the transceiver module comprises an analyzing means for processing measuring data provided by the monitoring means in a statistical manner, and where the analyzing means is connected to the electrical interface for providing processed measuring data to the electrical interface. The inventive transceiver module is easy to install, and only a small amount of monitoring data needs to be transferred.

Optical transceiver module for monitoring an optical fiber and method for making available measuring data from monitoring an optical fiber

The invention relates to a method for the reflectometric testing of an optical transmission line from an optical transmission and reception device, in which a test signal is fed into the transmission line from the direction of the optical transmission and reception device and the signal reflected back to the optical transmission and reception device is analysed, in which the transmission device provided for transmitting the useful signal is also used as the transmitter of the test signal by switching it from transmission mode to test mode, and the transmission device itself is used as the receiver of the reflected signal, as well as to an optical device and to an optical transmission and reception device therefore.

Method for the reflectometric testing of an optical transmission line, optical device and optical transmission and reception device

A method for measuring interference effects on a glass fiber transmission link produced by polarization mode dispersion, whereby an optical light source feeds a side band modulated signal into the transmission link, the signal is transmitted and at a coherent receiver the signal is evaluated at a frequency corresponding to the modulation frequency of the side band modulated signal.

Transmission system and associated method for measuring interference effects of glass fiber transmission links

A procedure for creating an optical output signal (S') in which two optical signal parts (S.sub.1, S.sub.2) of different frequencies are created from an optical signal (S) of a fixed frequency (.nu..sub.0), whereby one of the optical signal parts (S.sub.1, S.sub.2) has a data signal (D) impressed and both optical signal parts (S.sub.1, S.sub.2) together form the optical output signal (S'), the optical signal (S) is fed to two branches (4, 5), two optical sideband carriers (.nu..sub.0 -f.sub.m, .nu..sub.0 +f.sub.m) are created in one of the two branches (4, 5) with regard to the optical signal (S), one sideband carrier of which is removed, the optical signal (S) in one of the two branches (4, 5) has a data signal (D) impressed and both divided optical signal parts (S1, S2) are then brought back together to form one single optical output signal (S'). In this way the effort required for creating both optical signal parts and/or the optical output signal can be reduced.

Procedure and device for creating an optical output signal

A prior art optical transmitter for an optical communication system having a radio system connected thereto comprises a DFB laser, an optical modulator, a signal source, and an optical filter. This optical transmitter transmits light which is not modulated by an intelligence signal. It is disadvantageous in that the optical filter and the DFB laser must be matched. An embodiment of the optical transmitter according to the invention comprises a light source (1), an optical modulator (2), and a control unit (3) which controls the light source (1) and the modulator (2) in such a way that the light emerging at the output (5) of the modulator (2) is modulated with an intelligence signal.

Optical transmitter for an optical communication system in connection

The invention relates to a microwave generator which is characterized by a multimode fiber ring laser (1) having associated with it an intermediate-frequency device (22) which generates the microwave frequency by forming the difference of the frequencies assigned to the modes.

Growing community of inventors

Schwieberdingen, Germany

Harald Schmuck