The laser drive is one of the key components needed to generate the high-current, high-speed signal required for driving a transmitter, This paper propose a novel parallel laser drive circuit model with adaptive bandwidth bus architecture based on hybrid current/voltage mode. By using the highly parallel characteristics of the VCSEL and the bus structure, the system becomes very compactable. Several improvements can be achieved in signalling speed by using current mode in comparison to voltage mode. Therefore we use the current mode control module. By using the on hybrid current/voltage mode in the data path, the static power dissipation is reduced greatly when the data path is idle. Overall power dissipation improvement is attained over voltage-mode signalling schemes at high data rates while minimizing the power dissipation.
In order to find the optimal design for a given specification of an optical communication link, an integrated simulation of electronic, optoelectronic, and optical components of a complete system is required. It is very important to be able to simulate at both system level and detailed model level. This kind of model is feasible due to the high potential of Verilog-AMS language. In this paper, we propose an effective top-down design methodology and employ it in the development of a complete VCSEL-based optical links simulation. The principle of top-down methodology is that the development would proceed from the system to device level. To design a hierarchical model for VCSEL based optical links, the design framework is organized in three levels of hierarchy. The models are developed, and implemented in Verilog-AMS. Therefore, the model parameters are fitted to measured data. A sample transient simulation demonstrates the functioning of our implementation. Suggestions for future directions in top-down methodology used for optoelectronic systems technology are also presented.