KEYWORDS: Modulation, Single sideband modulation, Radio over Fiber, Microwave radiation, Modulators, Signal detection, Eye, Single mode fibers, Phase shifts, Particle filters
To simultaneously modulate and transmit 10-Gb/s baseband and 20-GHz microwave signals on a single wavelength
using single-sideband (SSB) modulation technique, a novel ROF scheme is proposed and verified by simulation. Based
on a Dual-Parallel Mach-Zehnder Modulator (DPMZM) the scheme can carry the microwave signal on the upper
sideband(USB) and the baseband signal on the lower sideband(LSB). It is to be seen from the simulated results that the
crosstalk between the signals with dual services is very small. By means of subcarrier-multiplexing (SCM) technique, the
optical 20-GHz microwave wave carrier is generated to carry 155-Mb/s baseband signal and 10-Gb/s baseband signal is
imposed on the original optical carrier via SSB modulation. The simulated results of BER and the eye diagram are
achieved separately. The signals with dual services are successfully transmitted over 50-km single-mode fiber.
Simultaneous generation and transmission of 10-Gb/s baseband signal and 20-GHz microwave signal with 155-Mb/s
on-off-keying (OOK) data on a single wavelength over 50-km-long fiber link based on a dual-parallel Mach-Zehnder
modulator (DPMZM) are investigated. After simultaneous modulation of the baseband signal and microwave signal at
central office (CO), the hybrid signals are separated by interleaver(IL) or fiber Bragg grating (FBG) at base station (BS).
The center wavelength spacing and bandwidth of IL, also the reflection ratio, center wavelength and bandwidth of FBG
are to be considered carefully as the baseband and microwave signal are only tens of GHz spacing and hard to be
separated with each other. Through theoretical analyses and simulation, for the demonstrated hybrid transmission system,
the relations of Q factor with the reflection ratio and bandwidth of FBG are analyzed separately in different fiber links
(SMF and DSF).
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