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We model optical parametric oscillation in ring cavities, focusing on silicon at 1.55μm, as a potential frequency-comb source for microwave and terahertz generation. Oscillation is possible if free-carrier absorption can be mitigated; this can be achieved using carrier sweep-out in a reverse-biased p-i-n junction to reduce the carrier lifetime. By varying the pump power, detuning, and reverse-bias...
In this paper, based on optoelectronic oscillator (OEO) and post digital linearization techniques, a wideband microwave photonic downconverter with low phase noise and improved linearization is proposed and demonstrated. The local oscillator signal from OEO with 26GHz and radio frequency (RF) signal are fed to an intensity modulator (IM) at quadrature point, leading to downconversion at photodiode...
A microwave photonic sub-harmonic mixer with a wide bandwidth, high RF-to-LO isolation and high RF/LO-to-IF isolation is presented. High isolation between the RF port and the LO port is obtained by separately applying the RF signal and the LO into two Mach Zehnder modulators, which are far apart, inside an integrated four-parallel Mach Zehnder modulator to avoid crosstalk between signal electrodes...
We proposed and demonstrated a novel photonic and digital hybrid flexible satellite payload with resources sharing for multi-channel communication payloads at L, S, Ku and Ka band. The system uses microwave photonic up/down conversion to realize receive different band microwave signals and convert to fixed IF frequency. We further show that the photonic and digital hybrid switching is used compared...
A method of generating large bandwidth linear chirped microwave waveform (LCMW) with a double frequency-tuning scheme, which is based on an optoelectronic oscillator with frequency multiplication tunable and a recirculating polarization modulation loop (RPML), is proposed. The frequency can be tuned finely by the TOEO, and also can be tuned coarsely while the multiplication factor can be tuned by...
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