Transmissive resonant fiber-optic gyroscope employing Kagome hollow-core photonic crystal fiber resonator
Xinxin Suo, Haicheng Yu, Jing Li, Xudong Wu
Abstract
A novel scheme for a double closed-loop resonant fiber-optic gyroscope (R-FOG) employing a high-performance transmissive Kagome hollow-core photonic crystal fiber (HCPCF) resonator is proposed. We use specially designed Kagome HCPCFs and a meniscus lens module to form a resonator, whose finesse is 58.2 with a length of 5.6 m and a diameter of 13 cm; the theoretical sensitivity of the R-FOG is better than 0.05°/h. Based on the novel Kagome HCPCF resonator, a double closed-loop R-FOG is set up and the performance of the R-FOG system is experimentally studied. It demonstrates that white noise dominates in the output at the integration time of 200 s and a bias stability of 0.15°/h and angle random walk coefficient of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:msup> <mml:mn>0.04</mml:mn> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:mo>∘</mml:mo> </mml:mrow> </mml:msup> <mml:mspace width="thinmathspace"/> <mml:msup> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:mi mathvariant="normal">h</mml:mi> </mml:mrow> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:mn>1</mml:mn> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:mo>/</mml:mo> </mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> </mml:msup> </mml:math> are achieved. Over a dynamic range of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:mo>−</mml:mo> </mml:mrow> <mml:msup> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:mn>100</mml:mn> </mml:mrow> <mml:mo>∘</mml:mo> </mml:msup> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:mo>/</mml:mo> </mml:mrow> <mml:mi mathvariant="normal">s</mml:mi> </mml:mrow> </mml:math> to 100°/s, the scale factor nonlinearity of the FOG is 310 ppm, which shows significant improvement compared with the single closed-loop R-FOG system. The novel double closed-loop R-FOG proposed is quite feasible for tactical grade applications.