Modeling And Simulation Of Quantum-dot Photoelectric Devices Based On PSpice

With the invention of quantum dot material, compared with the optoelectric devices made by bulk materials and quantum well materials, quantum-dot optoelectric devices have many unique advantages. And with the progress of self-organization of quantum dot growth technology, quantum-dot optoelectric device become one of interesting research areas worldwide and have more and more applications. At the same time, with the development of integrated circuits and communication technology, the optoelectronic integrated circuits(OEIC) has been the key technology in the field of optical fiber communication and the significant beginning for the optoelectronic integrated circuits(OEIC) is to establish accurate and convenient model of optoelectronic component. However the study on the electrical model of quantum-dot photoelectric devices, especially quantum-dot lasers and quantum-dot optical amplifier, is still far from maturity.Firstly, we expounded the basic structure of the quantum dot material, and pointed out the density of states and various properties of the quantum dots. Then, we analyzed the major advantages of quantum-dot lasers and quantum-dot optical amplifier. And the main components and simulation analysis method of PSpice are introduced.Secondly, based on the transition models of single-mode and multi-mode quantum-dot lasers, detailed analysis of all kinds of transition process and the basic theory of gain in single-mode and multi-mode quantum-dot lasers have been introduced. With those theory, we established the rate equations of single-mode and multi-mode quantum-dot lasers, and then established the equal circuits of those rate equations. We simulated many characteristics by the circuit model of quantum-dot laser, such as P-I characteristic, frequency characteristic, pulse response, etc, in single-mode quantum-dot lasers, and the spectrum in different tempreture, turn-on delay, etc, in multi-mode quantum-dot lasers.Finally, on the basis of the rate equations of quantum-dot optical amplifier, we established the equal circuits model of quantum-dot optical amplifier, then simulated and analyzed the gain spectrum and saturated gain characteristic of quantum-dot optical amplifier. Furthermore, we studied and simulated the cross gain characteristics of quantum-dot optical amplifier, and analyzed the performance of optical wavelength conversion with different input optical signal parameters. In this thesis, we also established the cascade circuit model of QD-SOA and EAM, and analyzed the performance of optical wavelength conversion with different delay and loss parameters, we found that the performance of optical wavelength can be improved with appropriate delay and loss parameters.