We present several laser sources dedicated to advanced microwave photonic applications. A quantum-dash mode-locked laser delivering a high-power, ultra-stable pulse train is first described. We measure a linewidth below 300 kHz at a 4.3 GHz repetition rate for an output power above 300 mW and a pulse duration of 1.1 ps after compression, making this source ideal for microwave signal sampling applications. A widely tunable (5-110 GHz), monolithic millimeter-wave transceiver based on the integration of two semiconductor distributed feedback lasers, four amplifiers, and two high-speed uni-traveling carrier photodiodes is then presented, together with its application to the wireless transmission of data at 200 Mb∕s. A frequency-agile laser source dedicated to microwave signal processing is then described. It delivers arbitrary frequency sweeps over 20 GHz with high precision and high speed (above 400 GHz∕ms). Finally, we report on a low-noise (below 1 kHz linewidth), solid-state, dual-frequency laser source. It allows independent tuning of the two frequencies in the perspective of the implementation of a tunable optoelectronic oscillator based on a high-Q optical resonator.
We report on the first tunable opto-electronic oscillator based on a fiber ring resonator and a dual-frequency laser. The dual frequency optical signal is generated by a doubly tunable solid-state dual-frequency laser at telecom wavelength; both optical frequencies are electrically and independently tunable over more than 1 GHz bandwidth. The fiber-ring resonator is 25 meters long and its quality factor is close to 5.10 8 . One laser line is stabilized on a resonance of the resonator with a PDH servo-controller. The heterodyne beatnote, still tunable by adjusting the frequency of the other line, is locked with a socalled optical frequency-locked loop based on the same resonator. As a result, the beatnote is stabilized on the closest multiple of the free spectral range of the resonator. At 10 GHz, we measured a phase noise below -85 dBc/Hz at 10 kHz.
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