We proposed and demonstrated a novel full-duplex radio-over-fiber system using an optical phase modulator and optical
interleaver to generate DWDM optical millimetre wave for carrying downstream data and wavelength reuse for uplink
connection. Since the optical phase modulator we used has not a dc-bias controller, and the optical interleaver is not as
sensitive to temperature as a fiber Bragg grating, the stability of the generated DWDM optical millimeter wave is largely
improved, and the optical power is effectively utilized because the remaining optical carriers with high power have been
reused. Moreover, the limitation of chromatic dispersion is greatly reduced due to avoiding the generation of higher order
sidebands via driving the phase modulator with optimized RF signal. So this system shows cost-efficient configuration
and good performance over long-distance delivery.
A configuration of transmitter for superimposing DPSK signals on dark RZ signals with tunable duty
cycle was proposed. The transmitter comprises two optical phase modulators and a delayed line Mach-Zehnder
interferometer. The simulation results show that the spectral efficiency is doubled by using this scheme.
KEYWORDS: Modulation, Signal detection, Radio optics, Modulators, Optical filters, Radio over Fiber, Signal generators, Extremely high frequency, Eye, Continuous wave operation
In this paper, a novel scheme to generate millimeter-wave with wavelength reuse by using one modulator has been
proposed. In such a system, a continuous wave lightwave is intensity-modulated via a dual-arm LiNbO3 Mach-Zehnder
interferometer modulator with DC biased at υ π and driven by two complementary modulation signals, which are
composed of a lower frequency RF cosine signal mixed with baseband signals by an electric mixer and a higher
frequency RF cosine signal. The optical carrier is suppressed and the generated optical signal mainly consists of four
sidebands, in which only two sidebands carry baseband signals. At the base station, an optical interleaver is used to filter
out the proposed optical mm-waves from the sidebands and another IL is used to filter out the wavelength reused for
uplink connection from the rest sidebands. The transmission performance of system is analyzed theoretically and
numerically.
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