An approach to single optical component antenna base stations for broad-band millimeter-wave fiber-radio access systems

To realize a cost-effective and practical antenna base station CBS) for 60-GHz-band millimeter-wave fiber-radio access systems, an approach to a single optical component BS is presented in this paper. The external modulation technique will allow to replace the pair of a photodetector (PD) and a laser diode with an external modulator at the BS by an optical transceiver. Two system architectures using different types of optical transceivers are studied in detail: one employs an electroabsorption transceiver (EAT), and the other employs an electroabsorption transceiver/mixer (EATX), The EAT serves simultaneously as a PD and an external light modulator in 60-GHz-band millimeter-wave region. The EATX furthermore acts as an IF-to-RE upconverter and an RE-to-IF downconverter, It will be shown that both system architectures have good prospects to realize cost-effective fiber-radio access systems.