The FORG operation principle uses a recirculating ring resonant cavity to get a rotation induced Sagnac effect enhancement. It grants to a FORG a comparable sensitivity in relation an I-FOG that has the fiber length S/2 times longer, where 5 is equal its finesse factor. Other advantage is despite of thermal drift because the FORG uses less quantity of fiber than the I-FOG, giving to the first less thermal drift than the last. But, due to the Kerr effect and coupler losses that causes parasitics effects like dissymmetry on signal response and cross polarization. Due to these facts, the FORG complexity is increased a lot. The signal response dissymmetries caused by Kerr effect can be corrected by phase nulling method, was proposed by Hotate. The proposal of this work is to show a technique applied to a FORG that simplifies the signal treatment, employing all digital setup, that results a maximally flat scale factor. In this investigation are presented simulations results, that employ the modified digital FM spectrometry techniques and decimation and interpolation techniques over a ring resonator that pursuit a 10 meters SM-PM length fiber coil and 10 centimeters of diameter core, with a 1.55 μm laser source. The advantages of these techniques are to simplify the electronic circuitry, offering an upgrade facility using only one DSP realizing all needed functions. The investigation of this method is based in an optical field switching scheme and digital frequency domain spectrometry too. The purpose of this work is to describe this digital technique, well as the simulations results, discussing about this technique use and its limitations.
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