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