Abstract
Photonic bandgap fiber-optic gyroscope has excellent environment adaptability and shows great prospect. The coupling between hollow-core photonic bandgap fiber coil and integrated-optic circuit is a crucial technology in photonic bandgap fiber-optic gyroscope. A low-loss low-back-reflection method for the coupling between a hollow-core photonic bandgap fiber and integrated-optic circuit is proposed. The end-face of the hollow-core photonic bandgap fiber only needs to be flat-cleaved with a general fiber cleaver. The optimal coupling angle is determined and experimentally verified to overcome the effect caused by the air gap between angle-cleaved integrated-optic circuit and flat-cleaved hollow-core photonic bandgap fiber end-face. Experimental results reveal that the coupling loss and back-reflection of the hollow-core photonic bandgap fiber with the integrated-optic circuit are better than ~ 3.2 dB and ~ -43 dB, respectively. Compared with conventional butt coupling and fusion splicing, the coupling performance of the proposed method is significantly improved, which can achieve low-loss, low-back-reflection, and high reliability. The method provides a foundation for the coupling between hollow-core photonic bandgap fiber coil and integrated-optic circuit in fiber optic gyroscope.
Highlights
The fiber optic gyroscope (FOG) is an optical fiber rotation sensor based on Sagnac effect [1]
It has been demonstrated that the nonlinear Kerr-induced phase drifts, thermally induced Shupe error, and Faraday effect are substantially reduced in a hollow-core photonic bandgap fiber-optic gyroscope (HC-PBFOG) compared to those of the conventional FOG [3]–[7]
Neither the butt coupling nor the fusion splicing between the Hollow-core photonic bandgap fibers (HC-PBFs) coil and integrated-optic circuit (IOC) pigtails in HC-PBFOG are perfect coupling methods. They cannot satisfy the practical requirements of HC-PBFOG. It is the connection between the HC-PBF and the traditional fiber whether by butt coupling or fusion splicing, which would cause a variety of non-reciprocity errors and they can be suppressed by direct coupling between fiber coil and IOC [10], [12], [13]
Summary
The fiber optic gyroscope (FOG) is an optical fiber rotation sensor based on Sagnac effect [1]. Neither the butt coupling nor the fusion splicing between the HC-PBF coil and IOC pigtails in HC-PBFOG are perfect coupling methods. They cannot satisfy the practical requirements of HC-PBFOG. It is the connection between the HC-PBF and the traditional fiber whether by butt coupling or fusion splicing, which would cause a variety of non-reciprocity errors and they can be suppressed by direct coupling between fiber coil and IOC [10], [12], [13]. The samples can achieve maximum loss and back-reflection of ∼3.2 dB and ∼−43 dB, respectively This coupling method provides a foundation for the direct coupling between HC-PBF coil and IOC in the future
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
