The Active Spontaneous Emission In EDF And Study On The Wavelength For980Nm Optical Switch

The Active Spontaneous Emission (ASE) is the important noise source for EDFA, affecting the EDFA based fiber laser seriously. The theory and practice have shown that the ASE is closely related with pump methods, so the study on the ASE of EDF under the condition of the pulse pumping has important academic significations. What’s more, the mode-locked laser based on EDFA fiber ring could be pumping by the pulse to realized mode-lock, and the ASE will impact its characteristics. In this paper, the effects of pump pulse with different width and amplitude on the ASE were investigated by the theoretical and experiment methods. An approximate analytical solution of output ASE noise average is derived when pump signal is small. The results show that the output amplitude of ASE is proportional to the input width of pump pulse when the pump pulse is small. The new phenomena can be used for the all-optical measurement of a pulse width.At the same time,we give the research for the Active Spontaneous Emission in EDF with many pulses, on the condition that the pulse width and amplitude are fixed,and then we find the output amplitude of ASE is also proportional to the number of pulse. Optical cross connection and optical add-drop modulation is necessary to optical network,at the same time,optical switch is the core device for the cross connection equipment and the optical add-drop modulation,so that optical switch will be the core optical device.Optical switch for980nm is important to the research for EDFA and the development of optical network.