The quantum well property of semiconductor optical amplifier for broadband width

To improve the characteristics of optical devices that used be WDM system optimally, we investigated two types of structures that consisted to be a non-uniform thickness quantum well. A possibility of the flat gain in the broad band is presented by optimizing the variation of wells thickness. This structure has different gain characteristics for different sequence of the well from p or n side. Thus, gain characteristics for two types of the structures were calculated to achieve broad range gain flatness for the non-uniform quantum well structure, the spontaneous emission also showed broadband characteristics. They have 3 dB bandwidths of spontaneous emission that are 57 nm, 50 nm respectively. And 3 dB bandwidths of structures are 1.4 times, 1.3 times wider than conventional structure