Two-Port Noise Suppression in Dual-Polarization Interferometric Fiber-Optic Gyroscope

• Main Authors: Pei Li, Yulin Li, Fangyuan Chen, Chao Peng, Zhengbin Li
• Format: Article
• Language: English
• Published: IEEE 2019-01-01
• Series: IEEE Photonics Journal
• Subjects: Noise suppression; RIN; dual-polarization; interferometric fiber-optic gyroscope; optical compensation.
• Online Access: https://ieeexplore.ieee.org/document/8680004/

Since the polarization non-reciprocity errors are canceled out through optical compensation in dual-polarization interferometric fiber-optic gyroscopes (IFOGs), two ports, namely, the reciprocal and nonreciprocal ports, are both feasible sensing output. In this work, we propose and demonstrate a weighted subtraction method for noise suppression that utilizes the partial correlated two-port signals simultaneously. The relative intensity noise has reduced to 56.2% of its original value in the experiment and agrees with the theoretical anal/ ysis; as a result, the angle random walk is suppressed from 5.7 x 10^-2 to 3.2 x 10^-2°/√h with a 2-km-long fiber. The improvement on shortand long-term stability performance has been experimentally verified, which makes dual-polarization IFOG configuration promising for many applications.