In this work, we propose and investigate a novel modulation technique for the generation of multiple millimeter wave (mm-wave) signals using high-order harmonic generation with a dual-electrode Mach-Zehnder modulator (MZM). The laser output is split into two branches by the use of a polarization beam splitter. We use polarization multiplexing to avoid the inter-symbol interference between multiple mm-wave signals. The proposed technique is comprised of two parallel MZMs. As an example, we consider an RF<sub>1</sub> at 7.5 GHz and RF<sub>2</sub> at 8.125 GHz, each of which carries its own data signal and drives each MZM, respectively; and mm-wave signals at 30 GHz and 32.5 GHz, i.e. a frequency quadrupler, are obtained after photomixing. The performance of the system is evaluated in terms of Q-factor. Simulation results show that data signal at 625 Mb/s is successfully transmitted over 50 km of single mode fiber. The generated mm-wave signal is robust to chromatic dispersion.
KEYWORDS: Optical amplifiers, Oscillators, Extremely high frequency, Modulation, Signal attenuation, Radio over Fiber, Modulators, Signal generators, Orthogonal frequency division multiplexing, Phase shifts
Performance of millimeter-wave (mm-wave) multi-band orthogonal frequency division multiplexing (MB-OFDM) ultrawideband
(UWB) signal over fiber transmission system is investigated considering impact of modulation index (MI).
Experiments are conducted to verify our theoretical analysis and good agreement is obtained. In this work, we propose
an optical frequency quadrupling technique using two cascaded Mach-Zehnder modulators (MZMs) biased at quadrature
and driven by the same local oscillator frequency but with 1800 phase shift between the two MZMs. We demonstrate
30GHz mm-wave wireless that carries three-bands OFDM UWB signals, and error vector magnitude is used to analyze
the transmission quality. It is found that the EVM decreases from ~-13.63 to -18.9 dB when increasing the LO
modulation index (MI) from 66 to ~117%.
Conference Committee Involvement (1)
International Conference on Electrical and Computer Engineering 2013