Details

Autor(en) / Beteiligte

• Fu, Cailing
• Li, Pengfei
• Bai, Zhiyong
• Wang, Yiping

Titel

Helical Long Period Fiber Grating Inscribed in Elliptical Core Polarization-Maintaining Fiber

Ist Teil von

• IEEE access, 2021, Vol.9, p.59378-59382

Ort / Verlag

Piscataway: IEEE

Erscheinungsjahr

2021

Link zum Volltext

Quelle

EZB-FREE-00999 freely available EZB journals

Beschreibungen/Notizen

• A high-quality helical long period fiber grating (HLPFG) in elliptical core polarization-maintaining fiber (PMF) was experimentally demonstrated by using the hydrogen-oxygen flame heating technique. Such a single HLPFG with a length of 6.5 mm could be used to generate orbital angular momentum (OAM) modes, i.e., OAM ±2 . The secret of the successful generation of the OAM ±2 mode is that the elliptical core PMF has two-fold symmetry in the cross-section. The resonance dip of the coupling attenuation and wavelength was strongly dependent on the length and helical pitch of the HLPFG. The HLPFG also exhibited a higher strain sensitivity of 30.7 pm/<inline-formula> <tex-math notation="LaTeX">\mu \varepsilon </tex-math></inline-formula>. The proposed method opens a new way to generate a higher-order OAM mode by using multiple-fold symmetry fiber.