In one embodiment, a method for generating an adaptive air interface waveform includes generating a waveform that includes a variable carrier frequency and variable bandwidth signal. The variable bandwidth signal includes one or more subcarriers that are dynamically placeable over a range of frequencies, and each subcarrier is separately modulated according to a direct sequence (DS) spread spectrum (SS) technique. The waveform has an embedded pilot usable to optimize one or more spectrum efficiencies of the waveform. A modulation constellation, a code rate, and a code length of the generated waveform are adapted according to an available spectrum and one or more sub-carrier conditions.

An adaptive air interface waveform

This invention provides an apparatus and method to aggregate individual fibre channel data streams in their native to extend connectivity of fibre channel storage area networks across wide geographical distances over a high-speed data channel with forward error correction

Apparatus and method for fibre channel distance extension embedded within an optical transport system

The disclosure relates to optical fiber transmission systems, and in particular, pertains to the transceiver cards in an optical fiber transport system. In particular the disclosure teaches an improved transceiver card architecture that allows high density, flexibility and interchangeability of functionality.

Flexible, dense line card architecture

A computer system and method for transmitting 10 Gigabit Ethernet (10GE) LAN signals over transport systems Standard 10GE LAN signals are generated in any client IEEE 8023 10GE LAN compliant interface A transceiver receives the client 10GE LAN signal in the LAN format The client 10GE LAN signals are not converted to a SONET transmission format at any time before reaching the transceiver The transceiver then converts the client 10GE LAN signal to an internal electrical 10GE LAN signal before re-clocking the internal electrical LAN signal The re-clocked internal electrical 10GE LAN signal is then re-modulated into a second 10GE LAN signal The second 10GE LAN signal is then transmitted to a transport system

Apparatus and method for transmitting 10 gigabit ethernet lan signals over a transport system

The invention pertains to optical fiber transmission systems, and is particularly relevant to transmission of large volumes of data over long distances at high rates. An improved apparatus and method for measuring dispersion in a fiber span is disclosed. In particular, the invention teaches a highly accurate technique for measuring the fiber dispersion at a single wavelength. Transmitter and receiver structure and data processing algorithms are disclosed. An improved apparatus and method for measuring dispersion in a fiber span. In particular, the invention teaches a highly accurate technique for measuring the fiber dispersion at a single wavelength. Transmitter and receiver structure and data processing algorithms are disclosed.

Apparatus and method for measuring the dispersion of a fiber span

The invention relates to a method and an optical transmission system for compensation of dispersion in optical transmission lines in which dispersion compensation fibers are applied, with the dispersion compensation fibers being arranged at the beginning as well as at the end of the line segments of the optical fibers forming the transmission line. The signal distortions due to non-linear effects are reduced by making use of the recognition that non-linearities should only occur at as small as possible an accumulated dispersion. This is obtained by an unequal division of the dispersion compensation fiber applied for the compensation of the dispersion of the optical fiber, with the part of the dispersion compensation fiber attached at the beginning of a line segment being directly connected to the optical fiber and having an accumulated dispersion which is smaller as to amount than the accumulated dispersion of the part of the dispersion compensation fiber attached at the end of the optical fiber.

Method and optical transmission system for compensating dispersion in optical transmission paths

Die Erfindung bezieht sich auf ein Verfahren und ein optisches Ubertragungssystem zur Kompensation von Dispersion in optischen Ubertragungsstrecken, bei denen Dispersionskompensationsfasern eingesetzt werden, wobei die Dispersionskompensationsfasern sowohl am Anfang als auch am Ende der die Streckenabschnitte der Ubertragungsstrecke bildenden optischen Fasern angeordnet sind. Die bekannten Verfahren und optischen Ubertragungssysteme weisen den Nachteil auf, das keine Masnahmen zur Minimierung der Signalverzerrungen durch nichtlineare Effekte vorgesehen sind. Bei der vorliegenden Erfindung werden die Signalverzerrungen durch die nichtlinearen Effekte durch Ausnutzung der Erkenntnis verringert, das Nichtlinearitaten nur bei einer moglichst geringen akkumulierten Dispersion wirksam werden durfen. Dies wird durch eine ungleiche Aufteilung der zur Kompensation der Dispersion der optischen Faser verwendeten Dispersionskompensationsfaser erreicht, wobei die am Anfang eines Streckenabschnitts angebrachte Teil der Dispersionskompensationsfaser direkt mit der optischen Faser verbunden ist und eine akkumulierte Dispersion aufweist, die betragsmasig kleiner als die akkumulierte Dispersion des am Ende der optischen Faser angebrachten Teils der Dispersionskompensationsfaser ist.

Verfahren und optisches Überttragungssystem zur Kompensation von Dispersion in optischen Übertragungsstrecken

Die Erfindung bezieht sich auf ein Verfahren und ein optisches Ubertragungssystem zur Kompensation von Dispersion in optischen Ubertragungsstrecken, bei denen Dispersionskompensationsfasern eingesetzt werden, wobei die Dispersionskompensationsfasern sowohl am Anfang als auch am Ende der die Streckenabschnitte der Ubertragungsstrecke bildenden optischen Fasern angeordnet sind. The invention relates to a method and an optical transmission system for compensating for dispersion in optical transmission paths, in which dispersion compensation fibers are used, wherein the dispersion compensating fibers are arranged both at the beginning and at the end of the sections of transmission line forming optical fibers. Die bekannten Verfahren und optischen Ubertragungssysteme weisen den Nachteil auf, das keine Masnahmen zur Minimierung der Signalverzerrungen durch nichtlineare Effekte vorgesehen sind. The known methods and the optical transmission systems have the disadvantage that no measures to minimize the signal distortions are provided by non-linear effects. Bei der vorliegenden Erfindung werden die Signalverzerrungen durch die nichtlinearen Effekte durch Ausnutzung der Erkenntnis verringert, das Nichtlinearitaten nur bei einer moglichst geringen akkumulierten Dispersion wirksam werden durfen. In the present invention, the signal distortion is reduced by the non-linear effects by exploiting the discovery that non-linearities may be effective only at a low accumulated dispersion as possible. Dies wird durch eine ungleiche Aufteilung der zur Kompensation der Dispersion der optischen Faser verwendeten Dispersionskompensationsfaser erreicht, wobei die am Anfang eines Streckenabschnitts angebrachte Teil der Dispersionskompensationsfaser direkt mit der optischen Faser verbunden ist und eine akkumulierte Dispersion aufweist, die betragsmasig kleiner als die akkumulierte Dispersion des am Ende der optischen Faser angebrachten Teils der Dispersionskompensationsfaser ist. This is achieved by an uneven distribution of the dispersion compensation fiber used for compensating the dispersion of the optical fiber, the attached at the beginning of a section of part of the dispersion compensation fiber is connected directly to the optical fiber and has an accumulated dispersion which in terms of magnitude smaller than the accumulated dispersion of the end of the optical fiber attached to part of the dispersion compensation fiber.

Method and optical transmission system for dispersion compensation in optical transmission lines

The optic transmission system includes one or several line sections (1,2) with dispersion compensation fibres (25,26,27,28). The first dispersion compensation (25,27) fibre is arranged in the beginning of the line sections, and the second dispersion compensation fiber (26,28) arranged at the end of each section. The entire accumulated dispersion of the first and second compensation fibre of a section of the line corresponds to the accumulated dispersion an optic fibre (29,30) forming the line section. The accumulated dispersion of the first dispersion compensation fiber in the beginning of each section of the line is smaller than the accumulated dispersion of the second dispersion compensation fibre at its end. The first dispersion compensation fibre in the beginning of each section is directly connected with the optic fibre of the line section.

Alfons Dipl.-Ing. Schinabeck

Papers

Method and optical transmission system for compensating dispersion in optical transmission paths

Verfahren und optisches Überttragungssystem zur Kompensation von Dispersion in optischen Übertragungsstrecken

Method and optical transmission system for dispersion compensation in optical transmission lines

Optic transmission system with dispersion compensation