Title :
Multi-Octave Analog Predistortion Circuit for HD2 and IM2 Compensation in Radio-over-Fiber Telecommunication Apparatuses
Author :
Roselli, L. ; Borgioni, V. ; Zepparelli, F. ; Comez, M. ; Faccin, P. ; Casini, A.
Author_Institution :
Dipartimento di Ingegneria Elettronica e dell´´Informazione, UniversitÃ\xa0 di Perugia. via G. Duranti 93, I-06125 Perugia, Italy. Tel: +39-(0)75-5853633, Fax: +39-(0)75-5853654, e-mail: roselli@diei.unipg.it
Abstract :
We describ here the development of a completely analog, low-cost, multi-octave predistortion circuit for Radio-over-Fiber telecommunication apparatuses. The predistorter is able to reduce of about 10 to 15 dB second-order distortions generated by semiconductor lasers operating in the frequency range 350 MHz ÷ 2 GHz, used with TETRA, GSM and DCS cellular networks. The predistorter has been designed on the basis of a laser circuit model of commercial DFB lasers previously developed. The conguration of the correction circuit has been implemented and realized to obtain the simultaneous correction of the laser second-order harmonic and intermodulation distortion components falling in the abovementioned cellular bands.
Keywords :
Circuits; Distributed control; Frequency; GSM; Land mobile radio cellular systems; Laser modes; Laser noise; Optical design; Predistortion; Semiconductor lasers; Radio-over-Fiber; harmonic measurements; linearization; predistortion;
Conference_Titel :
Microwave Conference, 2002. 32nd European
Conference_Location :
Milan, Italy
DOI :
10.1109/EUMA.2002.339263
