Bending Stability of Polarization in Hollow-Core Photonic Bandgap Fibers
Year: 2026
Type: article
Abstract: Hollow-core photonic bandgap fibers (HC-PBGFs) exhibit exceptional environmental stability, making them as prime candidates for next-generation, high-precision fiber optic gyroscopes (FOGs). High fiber birefringence is non-negotiable for maintaining gyroscope accuracy. However, the coil winding process introduces a challenge: bending shifts the core mode away from the center, altering its overlap with the core wall, which consequently destabilizes the birefringence. This study systematically investigates how bending impacts birefringence in two standard PM HC-PBGF designs, 7-cell and 19-cell fibers. We explore the effects of varying core geometries (specifically, different fundamental mode-surface mode anti-crossing states), bending radius, and bending directions. Using the birefringence change in Panda polarization-maintaining fiber at a 2 cm bending radius (measured at 0.46×10-4) as our benchmark, we find that the variations in birefringence of HC-PBGFs arise from surface mode drift. Near the anti-crossing point, the 7-cell HC-PBGF exhibits a striking maximum change of 4.15×10-4, being an order of magnitude greater than Panda fiber. The 19-cell fiber follows with a maximum of 0.77×10-4, roughly double that of Panda fiber. Crucially, away from this anti-crossing point, the birefringence change plummets below 10-7, demonstrating stability two orders of magnitude superior to Panda fiber. These insights chart a clear course for designing low bending sensitivity fibers, providing essential theoretical and data-driven guidance for developing highly stable hollow-core fibers tailored for FOG applications.
Source: IEEE photonics journal
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,075
OpenAlex ID: W7154184278
FWCI:
Cites:
Cited by:
Related to: