Abstract
A simple dual-loop optoelectronic oscillator using a 16μm side length AlGaInAs/InP directly modulated microsquare laser is proposed and investigated without an external modulator. High-performance first harmonics are realized, with 3dB linewidth, less than 200Hz, and a frequency-tunable range from 2 to 8GHz. Meanwhile, a side-mode suppression ratio of 60dB is obtained for the microwave by the dual-loop structure. Within the whole tuning range, the measured single-sideband phase noises of the first harmonics are about -110 dBc/Hz at 10kHz frequency offset. Furthermore, the second and third harmonics with frequency-tunable ranges from 4 to 16GHz and 6 to 24GHz are achieved as well.
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