Millimetre-wave electro-optical upconverterfor wireless digital communications

A Compact Photonics-Based Single Sideband Mixer Without Using High-Frequency Electrical Components

“…Hence various microwave photonic frequency up conversion techniques have been developed. They are based on using either electro-optic mixing in a Mach Zehnder modulator (MZM) [2] and in a phase modulator together with dispersion effect in an optical fibre [3], cross absorption modulation in an electroabsorption modulator (EAM) [4], cross phase modulation in semiconductor optical amplifiers [5] or stimulated Brillouin scattering (SBS) in a single mode fibre [6]. All these techniques require a subsequent filtering operation to remove the LO and the undesired sideband present at the mixer output.…”

Optical up-conversion on continuously variable true-time-delay lines based on chirped fiber gratings for millimeter-wave optical beamforming networks

“…Singlesideband plus carrier (SSB C) generators based on dualdrive optical modulators have been proposed to overcome the dispersive attenuation on the detected signal [3], but the dispersion phase term still has to be compensated after detection. On the other hand, electrooptical harmonic upconverting schemes are expected to reduce the requirements on the bandwidth of lasers or external modulators in millimeterwave applications [4]- [5]. It has recently been proven that the optical up-conversion of an intermediate frequency (IF) modulated (either directly or externally) optical carrier by means of a Mach-Zehnder electrooptical modulator (MZM) driven by a strong local oscillator (LO) signal and biased at its minimum transmission bias (MTB) point, sharply reduce Manuscript received October 7, 1998 the chromatic dispersion effects in standard fiber-optic links [4].…”