Abstract
We report the RF photonic reception and downconversion of vector modulated RF signals using a millimeter-wave coupled electrooptic phase modulator with in-plane slotted patch antennas based on SEO125 nonlinear polymer. We demonstrate experimental results with QPSK, 8-PSK, 16-QAM, 32-QAM, and 64-QAM millimeter-wave signals centered at 36 GHz. After downconversion to intermediate frequencies between 0.5 GHz and 2 GHz, the vector encoded signals are demodulated using an electrical signal analyzer and found to have measured error vector magnitudes below 8%. Design, simulation, fabrication, and experimental results are presented and discussed.
Highlights
Consumers and service providers demand more bandwidth for a range of image-rich multimedia and mobile applications in the modern network environment [1]
We show results where phase-shift keyed (PSK) and quadrature amplitude modulation (QAM) signals are electrically demodulated with measured root mean square (RMS) error vector magnitudes (EVM) of 8% or less after being received and downconverted via an Radio frequency (RF) photonic scheme incorporating our antenna-integrated EO modulator (AI-EOM)
This leads to a reduction in the enhancement factor and lowers the in-device poling efficiency resulting in higher carrier-to-sideband ratios (CSRs)
Summary
Consumers and service providers demand more bandwidth for a range of image-rich multimedia and mobile applications in the modern network environment [1]. Radio frequency (RF) photonic technologies can potentially meet the demand for wide bandwidth microwave and millimeter-wave (mmWave) distribution, frequency conversion, and detection, among others [2,3]. An electrooptic (EO) phase-modulator is promising for reducing the complexity of RF photonic front-ends at millimeter-wave frequencies where the antenna dimensions are small enough for device integration. Various types of wave coupled optical modulators have been reported since Sheehy et al demonstrated a dipole antenna-integrated LiNbO3 modulator for the first time [5,6,7,8,9,10,11,12,13]. Reception and photonic downconversion of vector modulated mmWave signals using an antenna-integrated EO modulator (AI-EOM) has not yet been demonstrated up to this point. MmWave wireless data, f1 laser, fc+f0 (local oscillator) laser, f c antenna-integrated phase modulator transmitter fiber link
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