Device with grating coupler-based depolarized interferometric fiber optic gyroscope

A device with a grating coupler-based depolarized interferometric fiber optic gyroscope, comprising:

• an integrated optical circuit arranged on a chip and configured to receive at least one optical signal from a light source, wherein the integrated optical circuit comprises a first grating coupler and a second grating coupler which serve as interfaces between the integrated optical circuit and external elements;
• a single-mode (SM) fiber coil assembly having a first end and a second end;
• a first polarization-maintaining (PM) fiber optically coupled with the first grating coupler, wherein the first PM fiber is connected between the first grating coupler and the first end of the SM fiber coil, and the first PM fiber connected to the first grating coupler is rotated by a first tilted angle Φ1 relative to a direction of grating stripes of the first grating coupler, where the first tilted angle Φ1 ranges from 35 degrees to 55 degrees;
• and
• a second PM fiber optically coupled with the second grating coupler, wherein the second PM fiber is connected between the second grating coupler and the second end of the SM fiber coil, and the second PM fiber connected to the second grating coupler is rotated by a second tilted angle Φ2 relative to a direction of grating stripes of the second grating coupler, where the second tilted angle Φ2 ranges from 35 degrees to 55 degrees, and wherein the first PM fiber and the second PM fiber have lengths L1 and L2, respectively, where L1>Ld1, L2>Ld1, an absolute difference value between L1 and L2>Ld1, and Ld1 is a first depolarization length that depends on a peak wavelength and a spectral width of the light source.