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We report in this paper a low noise mode-locked laser at 800 nm designed for high bandwidth photonic A/D converter based on a photoconductive switch approach. The laser uses a semiconductor optical amplifier implemented in a long fibred ring cavity with a high quality factor including an intensity modulator and a chirped Bragg filter. Active and harmonic mode-locking lead to optical pulses with repetition...
We present an all optical technique to demodulate THz signals on optical carriers using a standard optical phase modulator and an RF synthesizer. Noise floor as low as −95 dBc/Hz is reached at 700 GHz.
We report in this paper the direct sampling of a band-limited signal in the Ka Band by optical means. The sampling approach that has been used was based on a photoconductive switch made from low-temperature grown GaAs. The Photonic sampler may be used to down sample RF signals to base band before further conversion in digital by an electronic ADC. Thanks to this approach, the usual frequency mixers...
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