Design of a low-noise Er-Doped-Fiber-Amplifier (EDFA) for fiber hydrophone system

摘要

The paper reports a demonstration of a reflective Er-Doped-Fiber-Amplifier (EDFA) system. The system is designed for optical pre-amplification in remote fiber optic hydrophone system. In the reflective EDFA , a Fiber-Bragg-Grating (FBG) is placed at the EDFA output end to reflect the signal and to prevent the ASE feedback. A fiber with a reflecting end is also placed at the output end to reflect the pump. An experiment is also demonstrated to test the gain (G), noise figure ( NF ) , intensity noise and phase noise of the reflective EDFA in comparison with standard, single-pass configuration EDFA .The proposed EDFA shows higher gain but lower noise figure and lower relative intensity noise and phase noise than conventional standard configuration. While its gain is nearly twice that of the standard configuration, its NF is about 4dB lower than that of a standard configuration. In addition, the reflective EDFA reduces the phase noise at 1KHz and the relative intensity noise of the hydrophone system when it is high bumped.