Abstract

In this paper, we demonstrate the implementation of a widely tunable microwave signal generator based on a dual-polarization fiber grating laser. The laser contains two strong, wavelength-matched Bragg gratings photoinscribed in an Er-doped fiber and emits two polarization modes when pumped with a 980 nm laser diode. By beating the two modes, a microwave signal with a signal-to-noise ratio over 60 dB can be obtained. For a free running laser the fluctuations in intensity and frequency of the microwave signal are $\pm 1\mathrm{dB}$ and $\pm 5\mathrm{kHz}$, respectively, and the noise level is about $-40\mathrm{dBc}/\mathrm{Hz}$ at 1 kHz. The frequency can be continuously tuned from 1.8 to 15.1 GHz, by transversely loading the laser cavity and changing the intracavity birefringence by use of a piezoelectric transducer-based mechanical device. The measured response time rate of tuning is about 90 MHz/μs and the intensity fluctuation at different frequencies is less than $\pm 1.5\mathrm{dB}$. The frequency fluctuation under loading is controlled within 1 MHz by introducing an electrical feedback.

© 2015 Optical Society of America

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