Uplink radio access point for radio over fiber system

Abstract

The purpose of this project is to design the uplink radio access point (RAP) for radio over fiber (RoF). RoF is the technology whereby radio signal modulated the light then it's transmitted over an optical fiber link to facilitate wireless access. It also will be applying picocell technology as well. The RAP has 2 types of modulator which direct and external modulator but in this project will be focus on direct modulator. The uplink RAP design consists of BPF (optional), LNA and amplifier which operating at 2.4GHz band and also included a laser. The RAP is located after the antenna and before optical fiber. The execution of design is based on Optisystem software from Optiwave System. It is used to perform the simulation of the uplink RAP. In the simulation, the analysis of constellation and EVM diagram are concerned which it's presenting the receive signal at the central base station (CBS). The design optimization needs in order to enhance the signal receive performance. At the end of the design, the best simulation result was given by combination of LNA, amplifier and laser. With this arrangement, the receive signal at CBS is almost similar to the transmit signal from end user. Towards the end, this combination is proposed as uplink RAP for RoF system which operating at WLAN 2.4GHz band.