A potentially cost-effective radio-over-fiber (ROF)/fiber-to-the-X (FTTX)/CATV hybrid three-band transport system
based on direct modulation of a distributed feedback laser diode (DFB LD) with multi-wavelength output characteristic
is proposed and experimentally demonstrated. Directly modulated radio-frequency (RF) (1.25Gbps/6GHz), externally
remodulated baseband (BB) (622 Mbps), and externally remodulated CATV (channels 2-78) signals are successfully
transmitted simultaneously. Over an 80-km single-mode fiber (SMF) transmission, low bit error rate (BER) and clear eye
diagram were achieved for ROF and FTTX applications; and good performances of carrier-to-noise ratio (CNR),
composite second-order (CSO) and composite triple beat (CTB) were obtained for CATV signals. Since our proposed
systems use only a directly modulated DFB LD to achieve multi-wavelength transmission, it reveals an outstanding one
with simpler and more economic advantages.
We proposed and demonstrated an architecture by integrating radio-on-fiber (ROF) and fiber-to-the-home (FTTH)
transport systems simultaneously with the help of injection locking scheme. An externally modulated radio frequency
(RF) data stream and a directly modulated baseband (BB) data signal are simultaneously transmitted over an-80 km
single-mode fiber (SMF) link. Good bit error rate (BER) performances are achieved in our proposed integrated transport
systems. Such a proposed system is attractive and suitable for long-haul transmission due to its flexibility and simple
architecture with low-cost.