Receiver front-end bandwidth enhancement design

This paper is concerned with a systematic approach to the design of receiver for indoor optical wireless communication. In particular, it is concerned with how one properly chooses the front-end preamplifier and biasing circuitry for the photodetectorand comparison between differences types of amplifier, and method of bandwidth enhancement. For most photodetector applications, large values of RL and CD would severely restrict bandwidth. It is shown that a proper front-end design incorporates a transimpedance preamplifier which tends to integrate the detector output. Such a design provides significant reduction in photodiode capacitance and increase bandwidth when compared to a design which does not integrate initially. The theory and design obstacles of indoor optical wireless receiver delivery in addition to techniques for mitigating these effects and shows that infrared is a viable alternative to radio for certain application is also presented