Multi-Edge-Written Long-Period Fibre Gratings with Low PDL by Using High-Frequency CO2 Laser Pulses

摘要

A novel long-period fibre grating (LPFG) with lov polarization-dependent loss (PDL) is fabricated by using a multi-edge exposure method with high frequency CO2 laser pulses. The experimental results showy that the PDL ofa triple-edge-written LPFG with a peak amplitude of-16.5 dB can be as low as 0.22dB. These novel LPFGs can tind important applications in optical communication and sensing.