Abstract
In this paper, we describe the applications of novel long period fibre gratings written by high-frequency CO2 laser pulses to Er-doped optical fiber amplifiers (EDFAs). Such a type of gratings has been used for both ASE (Amplified Spontaneous Emission) noise reduction and gain equalization of EDFAs for the first time to our knowledge. The ASE noise of two EDFAs used as a pre-amplifier and an in-line amplifier has been successfully reduced from 4.0dB to ~3.5dB and from ~4.8dB to ~4.3dB with a small-signal gain increase of ~7dB for the in-line amplifier, respectively. In addition, the gain profiles of other two EDFAs have been flattened to +/- 0.5dB by using the LPFGs fabricated.
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