Photonik-optische Verbindungstechnik (Optische Mikrowellenverbindungen). Optische Mikrowellenerzeugung fuer die Mobilkommunikation Abschlussbericht

Two different optical techniques for the generation of low-phase noise millimetre-wave signals have been investigated which are used for the remote feeding of antenna stations in broad-band mobile communication systems. In the first case the signals of two lasers depicting a frequency spacing equal to the desired millimetre-wave frequency were heterodyned in an optic/millimetre-wave converter. The phase noise was suppressed by applying modulation sideband injection locking. This technique simultaneously stabilizes the generated frequency. In the second case only a single laser diode was used. The desired millimetre-wave signal was obtained by optical upconversion applying nonlinear effects caused by the laser chirp in combination with the fibre dispersion. An experimental system was built up in cooperation with R. Bosch GmbH Hildesheim. Errorfree full duplex operation was demonstrated with 155 Mbit/s data signals in the frequency ranges 18-20 and 60-70 GHz. Further experimental and theoretical investigations proved the feasability of the optical millimetre-wave technique in multichannel systems. Optic/millimetre-wave converters depicting a high conversion efficiency was developed in cooperation with our partners FhG IAF and DASA. The obtained results of the project demonstrate the advantages of the optical millimetre-wave technique in broadband mobile communication systems. With the two investigated photonic methods low- phase noise millimetre-wave signals were generated offering a high frequency flexibility and stability. Hence remotely fed low-cost antenna stations can be built up, further cost savings are possible by applying this technique in combination with monolithic integration of the necessary components. It was demonstrated experimentally that also the control stations of a mobile communication system can be simplified by using monolithically integrated optical millimetre-wave transmitters comprizing two tunable laser diodes and a waveguide coupler (potonic integrated circuit, PIC). (orig.)SIGLEAvailable from TIB Hannover: DtF QN1(69,14) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman