Flexibly tunable multichannel filter and bandpass filter based on long-period fiber gratings

Abstract

The voltage-controllable multichannel filter based on multiply cascaded long-period fiber gratings with a divided coil heater will be proposed and experimentally demonstrated. It has several advantages of the large tuning range in both C- and L-band, multichannel operation, multiwavelength selectivity, and bandwidth controllability. The tunable bandpass filter based on long-period fiber gratings with the broad bandwidth over 6.5 nm, large tuning range over 30 nm, and excellent side mode suppression more than 40 dB will be also discussed. (C) 2004 Optical Society of America.