Vincent R. Pagán

Linearized electrooptic microwave downconversion using phase modulation and optical filtering

We propose and demonstrate an electrooptic technique for relaying microwave signals over an optical fiber and downconverting the microwave signal to an intermediate frequency at the receiver. The system uses electrooptic phase modulation in the transmitter to impose the microwave signal on an optical carrier followed by re-modulation with a microwave local oscillator at the receiver. We demonstrate that by subsequently suppressing the optical carrier using a notch filter, the resulting optical signal can be directly detected to obtain a downconverted microwave signal.We further show that by simply controlling the amplitude of the microwave local oscillator, the system can be linearized to third-order, yielding an improvement in the dynamic range.

Electro-optic millimeter-wave harmonic downconversion and vector demodulation using cascaded phase modulation and optical filtering

We describe and demonstrate an electro-optic technique to simultaneously downconvert and demodulate vector-modulated millimeter-wave signals. The system uses electro-optic phase modulation and optical filtering to perform harmonic downconversion of the RF signal to an intermediate frequency (IF) or to baseband. We demonstrate downconversion of RF signals between 7 and 70-GHz to IFs below 20-GHz. Furthermore, we show harmonic downconversion and vector demodulation of 2.5-Gb/s QPSK and 5-Gb/s 16-QAM signals at carrier frequencies of 40-GHz to baseband.

Non-instantaneous optical nonlinearity of an a-Si:H nanowire waveguide.

We use pump-probe spectroscopy and continuous wave cross-phase and cross-amplitude modulation measurements to study the optical nonlinearity of a hydrogenated amorphous silicon (a-Si:H) nanowire waveguide, and we compare the results to those of a crystalline silicon waveguide of similar dimensions. The a-Si:H nanowire shows essentially zero instantaneous two-photon absorption, but it displays a strong, long-lived non-instantaneous nonlinearity that is both absorptive and refractive. Power scaling measurements show that this non-instantaneous nonlinearity in a-Si:H scales as a third-order nonlinearity, and the refractive component possesses the opposite sign to that expected for free-carrier dispersion.

Free space millimeter wave-coupled electro-optic high speed nonlinear polymer phase modulator with in-plane slotted patch antennas

We report in-plane slotted patch antenna-coupled electro-optic phase modulators with a carrier-to-sideband ratio (CSR) of 22 dB under an RF power density of 120 W/m(2) and a figure of merit of 2.0 W(-1/2) at the millimeter wave frequencies of 36-37 GHz based on guest-host type of second-order nonlinear polymer SEO125. CSR was improved more than 20 dB by using a SiO(2) protection layer. We demonstrate detection of 3 GHz modulation of the RF carrier. We also derive closed-form expressions for the modulated phase of optical wave and carrier-to-sideband ratio. Design, simulation, fabrication, and experimental results are discussed.

Simple method to characterize nonlinear refraction and loss in optical waveguides

We describe a technique for accurately measuring the ratio between the imaginary and real parts of the third-order nonlinearity in optical waveguides. Unlike most other methods, it does not depend on precise knowledge of the coupling efficiencies, optical propagation loss, or optical pulse shape. We apply the method to characterize a silicon waveguide, a GaAs waveguide, and AlGaAs waveguides with different alloy concentrations.

Phase-modulated radio-over-fiber systems

We present an overview of phase-modulated RoF systems and review methods for downconversion based on phase-modulation. We describe a technique for phase-sensitive detection and demonstrate downconversion and I/Q channelization of a 64-QAM microwave signal.

Electrooptic millimeter-wave downconversion and vector demodulation using phase-modulation and optical filtering

Here we have described an electrooptic technique for downconverting and demodulating high-speed vector modulated mmW signals. By using phase-modulation, the complexity of the optical transmitting end is reduced. By using phase-modulation with optical filtering, the complexity of the optical receiving end is only slightly greater than that of the IM-DD case. Furthermore, this approach allows for electrooptic frequency multiplication permitting less expensive components to be utilized. Based on this technique, we implemented a phase-diversity RF photonic RX and demonstrated downconversion of a mmW QPSK wireless signal to a suitable IF for digitization and follow-on processing. From these results, we believe that this approach is promising for the development of phase-sensitive, high-speed RF photonic receivers.

RF photonic downconversion of a QPSK signal with a millimeter-wave coupled polymer phase modulator

For the first time, we report the RF photonic downconversion of a quadrature phase-shift keyed signal using a millimeter-wave coupled phase modulator based on SEO125 nonlinear polymer. Design, simulation, fabrication, and experimental results are discussed.

Wireless BPSK communication Using electrooptic modulation for coherent microwave detection

We demonstrate a technique for electrooptically phase modulating digital data onto a microwave signal and performing coherent microwave detection and downconversion. The modulated microwave signal is wirelessly transmitted to show its potential in wireless applications.

Millimeter-wave 6 Gb/s wireless BPSK electrooptic link

We demonstrate a technique for electrooptically upconverting and phase modulating digital data onto an RF carrier and performing coherent detection and downconversion of the received millimeter-wave signal to baseband. The binary phase-shift keyed RF signal is transmitted wirelessly to show its potential in wireless applications.