Siemens Aktiengesellschaft

Xieon Networks S.a.r.l.

Werner Rosenkranz

Bernhard Spinnler

Stefano Calabro

Christoph Glingener

Christian Scheerer

Christina Hebebrand

Georg Mohs

Marc Bohn

Sven Otte

Jan Mietzner

Christoph Wree

A received POLMUX signal is rotated by fixed rotation parameters (Rot, Rot, Rot) and the rotated POLMUX signal with optimal signal performance is selected and phase information is derived from both polarities. A pre-filter improves the timing accuracy.

Symbol timing estimation for coherent polarization multiplex optical receivers

A method and system for duobinary coding of optical signals, wherein a precoded duobinary signal is supplied to a phase modulator which converts it to a phase-modulated optical signal, an optical filter carries out the function of the coder and converts the phase-modulated signal to an optical duobinary signal, and the duobinary coding results in a reduction in the bandwidth. A wavelength division multiplex system is provided by precoding a number of binary signals and converting them to phase-modulated signals, which are in turn, combined via an optical multiplexer, wherein the multiplex signal formed in this way is supplied to an optical filter which operates simultaneously as a coder for all the signals and produces a group of duobinary signals, and a number of groups of duobinary signals can be interleaved in one another in order to produce a dense wavelength division multiplex signal.

Method and system for duobinary coding of optical signals

A compensation system for adaptive equalization of an optical signal, wherein an optical filter, whose complex coefficients are adjustable, is used for signal equalization. The quality of the optical signal is used, after conversion to an electrical data signal, as a control criterion. The compensation device can largely compensate for distortion produced by dispersion, polarization mode dispersion or self phase modulation. An optical compensation filter with a wide free spectral range is used to compensate for the wavelength-dependent dispersion in a wavelength-division multiplexed system. The setting of the filter may be fixed, or may be adjusted adaptively in a closed control loop.

Compensation system for adaptive equalization of an optical signal

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Laboe, Germany

Werner Rosenkranz