.Study of the evanescent wave coupled semiconductor quantum dot amplifying fiber[J].Optoelectronics Letters,2007,3(1):14-17 Study of the evanescent wave coupled semiconductor quantum dot amplifying fiber WANG Ke-xin WANG Ting-yun PANG Fu-fei School of Communication and Information Engineering, Shanghai University, Shanghai 200072, China Abstract:       Based on the character of semiconductors and the structure of optical fiber coupler,a new amplifying fiber,coupled semiconductor quantum dot amplifying fiber (CSQDAF),has been presented. A simplified model of PbS quantum dot amplifying fiber is built on the energy band structure of semiconductor quantum dots,and a simple expression deduced from the two-level rate equations and light propagation equations is shown in this paper,by which the gain of quantum dot amplifying fiber can be calculated. A gain of approximately 4.5 dB has been measured in this coupled semiconductor quantum dot amplifying fiber at a wavelength of 1310 nm,when the fiber is pumped by a laser operating at a wavelength of 980 nm with power of 30 mW. Hits: 6129 Download times: 203 View Full Text    Download reader