Simplified Monte Carlo Calculation Of Avalanche Photodiodes Device Performance

As the size of the device is more and more small, some of the traditional simulation method of semiconductor device has limitations inevitably. In the field of small size, Monte Carlo method as a reliable simulation method has been widely used in the microscopic aspect. With the development of the internet, which need to carry more and more data and it also put forward higher requirement for bandwidth of optical communication network. The photodiode is used as a core component of optical receiver, so its performance requirements are also getting higher and higher, the traditional p-i-n photodiode has been unable to meet the demands for bandwidth optical communication system. Avalanche photodiode because of its high sensitivity and high operating speed is more and more used in fiber communication system, which also can provide higher sensitivity and signal to noise ratio. In view of these benefits, avalanche photodiodes in an optical receiver, such as photon counting, imaging applications and laser range findings, etc. More and more researchers begin to pay attention to research on the characteristics of Avalanche Photodiodes(APDs).This paper uses simple Monte Carlo algorithm, in the comparison of various models of APDs, finally using RPL model writes program and running the program in lcc software. The avalanche gain and excess noise behaviors in InP and InAlAs have been modeled. The reduction of avalanche region width presents a lower excess noise for both materials. In order to minimize the excess noise in APDs, the hole injection and electron and electron injection multiplication should be selected for InP and InAl As APDs, respectively. It also pointed out that in thin devices, the dead space effect can not be neglected. Finally running the program, four different gain material of APD of signal-to-noise ratio is calculated, and obtained their best work point, which used to guide the optical receiver designed.