Avanex Corporation

Alcatel Lucent

Roland Münzner

Peter Kersten

Joerg Schaepperle

Heinz-Dieter Hettstedt

José Antonio Lázaro Villa

Ekkehard Schomburg

Gerhard Schreiber

Georg Bastian

Joerg Dipl -Ing Schaepperle

The invention relates to a method for wireless cellular indoor communications, the method comprising at least one base station connected to a cell management unit through a first digital connection interface, the cell management unit connected to at least one RF hub through a second digital connection interface, and the at least one RF hub connected to at least one remote radio head through a third digital connection interface, the at least one remote radio head providing service in a certain cell area inside a confined environment, and the cell management unit comprising means for providing efficient load balancing at and between base stations through adaptive cell reconfiguration; means for mapping carriers, time, frequency or time-frequency allocations to individual radio heads; means for alignment of individual delays accumulated on the digital connections between the cell management unit and each of the radio heads; means for synchronization of the signals between the cell management unit and the individual remote radio heads; and means for failure detection of the individual digital links between the cell management unit and the remote radio heads.

Method and system for wireless cellular indoor communications

An optical component comprising an optical waveguide and adjacent to it at least one grating array adapted to reflect stray light away from said optical waveguide. The use of a grating array with a plurality of structures like polygons or stripes gives the possibility to define a multiple of reflection directions. This is obtained by using polygons layed out in different orientations up to a random one or a Bragg grating preferably defined with a non-uniform period (chirped). Such grating arrays are usually structured within the same layer as the optical waveguide core layer.

Stray light absorber including grating array

The invention is an optical device having a plurality of optical waveguides and comprising at least one waveguide, which is defined by a core region having first and second sections that are series connected and are capable of transmitting light energy, the core region being surrounded by a cladding that essentially confines the light energy within the core region, the first section of the core region comprising a first length of material whose refractive index increases as temperature increases; the at least one waveguide is temperature-compensating in that and the second section of the core region comprises a second length of material whose refractive index has a sufficient enough difference of the rate of the variation of the index with the temperature, wherein the second section has a plurality of grooves, filled with the material whose refractive index has a sufficient enough difference of the rate of the variation of the index with the temperature, that are designed in a way the effective width of the second section changes between adjacent wave guides.

Optical device for reducing temperature related shift

The invention relates to a method of forming a semiconductor component comprising the steps of:

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Bissingen/Teck, Germany

Roland Münzner