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The short-term sensitivity of a kilometer-long fiber-optic gyroscope islimited mainly by thermal phase noise and relative intensity noise. Increasingthe phase modulation frequency decreases the thermal phase noise but not therelative intensity noise since it behaves as white noise. Here, we propose andexperimentally demonstrate that the angular random walk can be effectivelydecreased by suppressing relative intensity noise at the modulation frequencyand its third-order harmonic using direct feedback to the drive current of asuperluminescent diode. Our simultaneous suppression of thermal phase noise andrelative intensity noise yields an angular random walk of$15\,\mu\mathrm{deg}/\sqrt{\mathrm{h}}$ and a bias instability of$33\,\mu\mathrm{deg}/\mathrm{h}$ using a fiber coil with a length of $5\,$kmand an effective area of $280\,\mathrm{m^2}$ for a measurement time of 40hours.

Simultaneous Suppression of Thermal Phase Noise and Relative Intensity Noise in a Fiber Optic Gyroscope