Wavelength tuning range enhanced single resonant band fiber filter using a long period grating (LPG) withultra thin cladding layer

摘要

A unique fiber filter using a LPG with ultra thin cladding layer (～32 μm) is presented, which has a single resonant band within 1000 nm to 1700 nm wavelength range and a wavelength tuning sensitivity as large as 30 nm shift for a 2×10{sup}(-3) surrounding refractive index change.