New Method of Writing Long Period Fiber Gratings Using High-Frequency CO_2 Laser

摘要

In the paper, the Long period fiber gratings (LPFG) were fabricated in a single-mode fiber using a high frequency CO_2 laser system with the point-to-point technique. The experimental setup consists of a CO_2 laser controlling system, a focusing system located at a motorized linear stage, a fiber alignment stage, and an optical spectrum analyzer to monitor the transmission spectrum of the LPFG. The period of the LPFG is precisely inscribed by periodically turning on/off the laser shutter while the motorized linear stage is driven to move at a constant speed. The efficiency of fiber writing process is improved.