Integrated Interferometric Fiber Optic Gyroscope Employing a Photo-Electronic Chip
Xinxin Suo, Haicheng Yu, Xudong Wu
Abstract
A novel integrated interferometric fiber optic gyroscope (I-FOG) employing photo-electronic chip and mini polarization maintaining photonic-crystal fiber (PM-PCF) coil is proposed. In the I-FOG, the front optical path, which includes a super-luminescent diode, lens group, a Y junction waveguide and a photodiode, is integrated in a photo-electronic chip employing spatial coupling methods. To minimize the fiber coil with large sensitive effect, a type of <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$60~\mu \text{m}/100~\mu \text{m}$ </tex-math></inline-formula> ultra-thin diameter PM-PCF is customized. Finally, with a 600-m-long PM-PCF coil of 26mm outer diameter, a high-accuracy integrated I-FOG is achieved. It experimentally demonstrates a bias stability of 0.05°/h at the integration time of 100 s, with an ARW of <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$0.0083^{\circ} /\text{h}^{\mathrm {1/2}}$ </tex-math></inline-formula> and a scale factor nonlinearity of 32ppm over the range of ±400°/s at room temperature. It also shows a bias stability of 0.11°/h at the integration time of 100 s over the temperature range from <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$- 30^{\circ} \text{C}$ </tex-math></inline-formula> to <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$60^{\circ} \text{C}$ </tex-math></inline-formula> . Compared with conventional I-FOG with discrete photo-electric devices and PANDA polarization maintaining fiber (PMF), the integrated I-FOG proposed has great advantages in high accuracy and small volume, which is quite feasible for the application of tactical weapon, autonomous positioning and navigation platforms.