摘要
Based on theoretical and experimental studies on the optical properties of long-period gratings(LPGs),an erbium doped fiber amplifier(EDFA)gain equalizer was fabricated by writing three long period gratings with designed properties in hydrogen-loaded standard single-mode fibers.The LPGs were written by a KrF excimer laser at 248 nm with amplitude masks.The gain variation of±3dB in the EDFA is reduced to±0.3 dB with a bandwidth of 30 nm and the total insertion loss of the device is less than 0.3 dB.
基金
Supported by the National Natural Science Foundation of China under Grant No.69777010,the National 863 High Technology Project of China,and the Paper Publication Foundation of Northern Jiaotong University.
