Deutschetelekom Ag

Nippon Telegraph and Telephone Corporation

Astro Strobel Kommunikationssysteme Gmbh

Ralph Leppla

Werner Weiershausen

Matthias Gunkel

Malte Schneiders

Sascha Vorbeck

Yutaka Miyamoto

Yoshiaki Kisaka

Akira Hirano

Peter Muggenthaler

Michael Bousonville

Arnold Mattheus

Christoph Tudziers

Marko Loeffelholz

Frank Rumpf

Werner Würtenberger

Marko LÖFFELHOLZ

Mirko Ries

Franz-Josef Leitinger

Bernd Zopf

Yutaka Ntt Intellectual Property Center Miyamoto

Akira Ntt Intellectual Property Center Hirano

Sascha Dipl-Ing Vorbeck

Malte Dipl-Ing Schneiders

Werner Dipl-Ing Weiershausen

Frank Dipl-Ing Rumpf

Yoshiaki Ntt Intellectual Property Center Kisaka

A method for transmitting digital subscriber connection signals to an interface of an end user via a coaxial cable includes: supplying, by a distribution point unit (DPU), first balanced subscriber connection signals to the coaxial cable by a first transformation; coupling unbalanced subscriber connection signals into the coaxial cable into a lower frequency range of an overall frequency range; attenuating, by means of a filtering device, a reflection of the unbalanced subscriber connection signals in the coaxial cable; a second transformation of the unbalanced subscriber connection signals into second balanced subscriber connection signals by means of a balun device assigned to the interface, wherein the input impedance of the filtering device is adjusted with respect to reflections from the direction of the customer terminal output; and separately making the second balanced subscriber connection signals available at the customer terminal output.

Transferring digital subscriber connection signals via a coaxial cable

A system and method for Raman amplification of optical signals in a wavelength division multiplexing (WDM) optical transmission system includes transmitting optical signals within a transmission band via an optical waveguide between a transmitter and a receiver, Raman-amplifying the optical signals with at least one pump so as to distort an amplification profile of the Raman amplification within the transmission band, and rectifying the distorted amplification profile so as to compensate for the distortion.

Method for the raman amplification of optical signals and transmission system

A method for optical data transmission in a wavelength multiplexing system having at least two transmission channels of different wavelengths includes determining at least one value which is a measure of a physical property of an optical data transmission path of the wavelength multiplexing system; and automatically adjusting a transmission parameter of at least one of the transmission channels as a function of the determined at least one value.

Method and device for channel-adapted signal transmission in optical networks

A method for detecting and locating faults in an optical transmission path, and to an optical transmission system having such a functionality, is provided. By measuring the temporal change in the state of polarization SOP, external influences on a glass fiber cable of a long-haul transmission system, e.g., a WDM transmission system, may be detected. Such fault(s) may be localized with the aid of the relative arrival time of the polarization signal at both sides of a bidirectional transmission system.

Method for detecting and localizing faults in an optical transmission path, and optical transmission system

The present invention proposes a method whereby during a specified/specifiable observation period (T) , the polarization states of optical transmission system and/or the optical signals transmitted by the optical transmission system are changed by applying a targeted intervention in at least one position of the transmission line, and at a second position which is interposed at least one place downstream from the first position of the optical transmission line, a specified/specifiable signal characteristic (BER) is qualitatively measured and checked for adherence to a specified/specifiable threshold condition (BER) and the PMD-induced outage probability of the optical transmission system is calculated on the basis of the ratio between the length of that share of the time (T), during which the measured signal characteristic fails to meet the threshold condition (BER), to the length of the observation period (T).

Processes and devices for the determination of a PMD-induced outage probability of an optical transmission system

Growing community of inventors

Darmstadt, Germany

Ralph Leppla