KEYWORDS: Modulation, Radio over Fiber, Fiber to the x, Single mode fibers, Eye, Composites, Single sideband modulation, Networks, Optical amplifiers, Light sources
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.
KEYWORDS: Fiber to the x, Radio over Fiber, Modulation, Single mode fibers, Modulators, Fiber Bragg gratings, System integration, Signal detection, Light sources, Electro optical systems
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.
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