Remote downconversion scheme for uplink configuration in radio/fiber systems

Abstract

The authors present a novel technology for uplink transmission in Radio over Fiber (RoF) distribution systems. The technique employs remote downconversion of the uplink data to Intermediate Frequency (IF) in the Base Station (BS). The Local Oscillator (LO) signal for the downconversion is optically generated in the Central Station (CS) and sent to the BS via optical fiber. The IF uplink data is then modulated onto an optical carrier and sent to the CS, where the baseband conversion takes place. By employing this method of uplink connection simplicity and cost efficiency of the BS is achieved.

100/1000 Gbit/s Ethernet and beyond

“…However, owing to top performance of contemporary optical fibres there is a tendency to deploy fibres as far close to the end user as possible [5]. Thus fibres are used not only for digital voice or Internet traffic transmission, but also for expanding radio-over-fibre transmission applications that exploit the optical carrier wave amplitude modulation with a microwave carrier [6], [7], including analogue cable television transmission. A question arises: why higher speed Ethernet?…”