Xieon Networks S.a.r.l.

Siemens Aktiengesellschaft

Nokia Siemens Networks Gmbh & Co Kg

Nokia Siemens Networks Oy

Gm Global Technolgoy Operations, Inc.

Xeion Networks S.a.r.l.

Nokia Solutions and Networks Gmbh & Co. Kg

Lutz Rapp

Wolfgang Peisl

Dario Setti

Guido Gentner

Anton Schex

Erich Gottwald

Bernhard Spinnler

Christoph Glingener

Christian Scheerer

Jörg-Peter Elbers

Danish Rafique

Michael Rasztovits-Wiech

Stefan Gianordoli

Andreas Färbert

Christian Eder

Arne Striegler

Andreas Stadler

Tiago Mestre

Stefano Calabrò

Carlo Marques

Nuno Renato Duarte Pereira

Torsten Wuth

Nelson Costa

Pereira Nuno Renato Duarte

Disclosed herein is a method of encoding and/or decoding data for optical data transmission along a transmission link, as well as corresponding transmitters and receivers. The data is encoded based on an adaptive constellation diagram in a 2-D plane, said constellation diagram including a first and a second pair of symbols, wherein the symbols of the first pair of symbols are located at opposite sides of the origin of the 2-D plane at a first distance di from each other, and wherein the symbols of the second pair of symbols are located at opposite sides of the origin of the 2-D plane at a second distance d2 from each other. The method comprises a step of adapting the constellation diagram by varying the ratio of the first and second distances d, dsuch as to minimize or nearly minimize a bit error rate in the transmitted data.

Adaptive constellation diagram reducing the impact of phase distortions

The disclosure relates to a method, an optical receiver and an optical system for compensating, at an optical receiver, signal distortions induced in an optical carrier signal by a periodic copropagating optical signal, wherein the optical carrier signal and the copropagating signal copropagate at least in part of an optical system or network, by: receiving, at the optical receiver, the optical carrier signal, wherein the optical carrier signal is distorted by the copropagating signal; determining, at the optical receiver, a period of a periodic component of the distorted optical carrier signal; determining, at the optical receiver, a periodic distortion of the distorted optical carrier signal; and generating a compensation signal to correct the distorted optical carrier signal according to the determined periodic distortion.

Compensation of signal distoration induced by a periodic optical copropagating optical signal

Disclosed herein is a transponder comprising a transmitter and a receiver. The transponder further comprises a receiver input amplifier, a bypass line, and a control unit configured for determining the performance of the transponder in relation to an OSNR related parameter, by controlling the transponder to generate a noise signal to be received by the receiver. The receiver input amplifier is operated to thereby cause ASE in the receiver input amplifier to facilitate the determination. A test signal is generated at the transmitter Said noise signal and said test signal, and/or one or more respective replicas thereof, are superimposed to form a combined signal to be received by said receiver to further facilitate determination of said performance related parameter based on said combined signal, wherein for generating said combined signal, said test signal is fed from the transmitter to the receiver by means of said bypass line.

Automatic measurement of the noise performance of a transponder

A Raman pumping device () for amplifying a data optical signal in a fiber optic transmission system, comprising first and second ports () through which the data optical signal may respectively enter and exit the Raman pumping device (), a Raman pump source () for generating a Raman pump signal, and at least one combiner () for combining the Raman pump signal with the data optical signal. The Raman pumping device () allows for selectively combining the Raman pump signal generated by the same Raman pump source (), or at least parts of the same Raman pump source () codirectionally or counterdirectionally with the data optical signal.

Bidirectional and configurable directional Raman pumping apparatus

A method for determining the position of an irregularity in an optical transmission fiber using an optical time domain reflectometer, the method comprising the steps of emitting a succession of sampling light pulses into the optical transmission fiber, detecting reflected light pulses resulting from the reflection of the sampling light pulses at the irregularity in the optical transmission fiber and generating corresponding time-dependent detection signals, wherein different delays are associated with detection signals corresponding to different sampling light pulses, obtaining a combined signal from the detection signals, and analyzing the combined signal for determining the position of the irregularity in the optical transmission fiber with respect to the optical time domain reflectometer, wherein the combined signal corresponds to a superposition of the detection signals.

OTDR with increased precision and reduced dead zone using superposition of pulses with varying clock signal delay

The invention discloses a method of amplifying an optical signal, in particular a data signal, transmitted from a first location (A) to a second location (B) via a first transmission link (), wherein said optical signal is amplified by means of a transmitter side remote optically pumped amplifiers (ROPA) () comprising a gain medium (), wherein the gain medium () of said transmitter side ROPA () is pumped by means of transmitter side pump power () provided from said first location (A), characterized in that at least a part of said transmitter side pump power () is provided by means of light supplied from said first location (A) to said transmitter side ROPA () via a portion of a second transmission link () provided for transmitting optical signals from said second location (B) to said first location (A).

Codirectional ROPA supplied with power via a separate fiber transmitting data in opposite direction

Disclosed herein is a method of transmitting a data stream from a first location to a second location through an optical network, as well as a corresponding performance monitoring unit, a transmitting arrangement and a receiving arrangement. The method comprises the steps of transmitting said data stream from said first location to said second location along a working path, wherein said data stream is transmitted in the form of a super channel comprising a number of n wavelengths within a predefined reserved wavelength range, monitoring the performance of the transmission based on the super channel signal received at said second location, and in case the performance is observed to drop below a predetermined performance threshold, unburdening the super channel from a part of said data stream while maintaining the reserved wavelength range for said super channel, by redirecting said part of the data stream for transmittal along at least one restoration path connecting said first and second locations, and transmitting the remainder of said data stream within the super channel on a number of wavelengths that is less than n, and/or with a reduced transmission rate for at least some of the wavelengths in said super channel.

Subcarrier diversity in optical communication systems

A system () for detecting a level of dirtiness of a filter mat () of an airflow cooling system for telecommunications equipment, the system () comprising a detector () for detecting fluorescent or reflected light backscattered at at least one part in () of the filter mat () comprising or treated with a fluorescent or reflective material, wherein the detector () comprises a light source () for illuminating said at least one part () of the filter mat () with sampling light, and a photosensor () for detecting fluorescent or reflected light backscattered at said at least one part () of the filter mat () caused by the illumination thereof with sampling light, wherein the system () is configured for inferring the level of dirtiness of the filter mat () from the amount of detected fluorescent or reflected light.

System and method for detecting a level of dirtiness of a filter mat of an airflow cooling system for telecommunications equipment

A method of distinguishing whether a detected change in reflected power in an optical time domain reflectometer (OTDR) measurement carried out in a fiber optic transmission system () using an OTDR is caused by a an event causing actual attenuation or a change in a mode field diameter, comprising the steps of emitting a succession of first sampling light pulses of a first wavelength into the fiber optic transmission system () while a pumping signal with a second wavelength is emitted into the fiber optic transmission system (), and measuring a first OTDR trace (') resulting from the reflection of the first sampling light pulses in the fiber optic transmission system (), such that the first sampling light pulses and their reflections interact with the pumping signal via stimulated Raman scattering. The method further comprises a step () of determining, based at least on information extracted from the first OTDR trace (&#x2032;), whether the detected change is mainly due to an event causing actual attenuation or to a change in the mode field diameter in the fiber optic transmission system ().

Detection of gainers and exaggerated losses in unidirectional OTDR traces

An optical network is suggested, comprising a first set of optical fibers, a multimode multiplexer, a multimode amplifier, a multimode demultiplexer, and a second set of optical fibers, wherein the first set of optical fibers is connected via the multimode multiplexer to the multimode amplifier and wherein the multimode amplifier is connected via the multimode demultiplexer to the second set of optical fibers. Accordingly, an optical network element is provided.

Optical network and optical network element

Disclosed is a method of Controlling a gain of an optical amplifier comprising a gain medium and at least one pumping device. The method comprises the following steps: determining or predicting a change of input signal power to the amplifier, changing the pump power from an initial pump power level to a new pump power level at a first time instant, the initial pump power level being the pump power level applied to the amplifier prior to the change in input signal power, setting the pump power to a second pump power level at a second time instant, wherein the pump power level is varied in an oscillatory manner for at least one period of time starting at a third time instant and ending at a fourth time instant, wherein said third time instant is identical with or later than said first time instant and said fourth time instant is identical with or earlier than said second time instant.

Pump power modulation in a feed-forward control for suppressing power transients

A Raman pumping arrangement for amplifying a data optical signal () has a Raman pump () for generating a Raman pump signal (), an optical supervisory channel receiver () for receiving an optical supervisory channel signal () an amplification fiber () arranged such that the data optical signal (), the optical supervisory channel signal (), and the Raman pump signal () are transmitted therethrough; and a control unit () configured for controlling the operation of the Raman pump (); wherein the control unit () is configured for setting the Raman pump () in an operation mode or a start-up mode; wherein in the operation mode, the Raman pump () provides an operation pumping power (), and wherein in the start-up mode, the Raman pump () provides a start-up pumping power ().

Raman pumping arrangement with improved OSC sensitivity

It is provided an apparatus, comprising a box configured to conduct an optical fiber from an exterior to an interior of the box; at least one of a mounting means adapted to mount a connecting means to which the optical fiber may be connected and a guiding means adapted to guide the optical fiber, wherein the at least one of the mounting means and the guiding means is arranged in the interior of the box; a detecting means arranged in the interior of the box adapted to detect a first signal from the interior of the box, wherein the first signal is at least one of a light and a smoke; wherein the interior of the box is substantially shielded from a second signal from an exterior of the box, and the detecting means is suitable to detect the second signal in a same manner as the first signal.

Fiber integrity monitoring

A method and a device is provided driving an optical laser diode () during operation in an optical communication network, by determining a laser transfer function () during operation of the laser diode () and providing a control signal () for driving the laser diode () according to the laser transfer function (). Further, a method for driving a first and a second optical laser diode during operation in an optical communication network is provided. Furthermore, an optical amplifier and a communication system is suggested.

Growing community of inventors

Deisenhofen, Germany

Lutz Rapp