Theoretical Research on the Strain Characteristics of the Selective-Filling Birefringent Photonic Crystal Fiber
In this paper, the detailed strain characteristics of a selective-filling birefringent photonic crystal fiber (SF-PCF) were analyzed theoretically. The SF-PCF was achieved by selectively filling two symmetrical air holes around the fiber core of a PCF with a high index liquid. The group birefringence and phase birefringence presented unique characteristics different from the traditional index-guiding birefringence fiber. Hence, the transmission and sensing characteristics of the Sagnac interferometer based on the SF-PCF presented diversity and high sensitivity. Finally, the highest strain sensitivity of −9.56 pm/με was theoretically achieved.
KeywordsPhotonic crystal fiber Birefringent fiber Selective-filling Strain sensor
This work was supported by the National Natural Science Foundation of China under Grant No. 11404240, and by the Doctoral Scientific Foundation of Tianjin Normal University under No. 52XB1307.