Tham khảo tài liệu 'photodiodes communications bio sensings measurements and high energy part 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | The Optimum Link Design Using a Linear PIN-PD for WiMAX RoF Communication 51 coaxial cable and the 10km optical fiber between the VSG and VSA. The third one used the coaxial cable the 10km optical fiber and the parabolic grid antennas between the VSG and the VSA. shows the experimental data and the theoretical data that are calculated with the equation . The experimental data of the received power coincided within 2dB with the theoretical data. Fig. . The received powers were measured with modulation powers of driving the DFB laser for three different types of system configurations. The solid lines showed the experimental data and the dashed lines showed theoretical data calculated with the equation RCE in RoF of WiMAX It was considered that the RCE was determined with the received power and the noise power ratio when the RoF system was configured with linear characteristic components and the optimized modulation condition that were not influenced by the PMD and PML. However it is not realistic to completely eliminate the influence by the PMD and PML in the actual link system. A compensation factor to the received power has to be taken into account. Hence the RCE is expressed using a compensation factor and a noise power as RCE PN - A PR where RCE dB is the Relative Constellation Error PR dBm is the received power A is the compensation factor to the received power and PN is the system noise power. In the calculation the following parameters are used A and PN dBm . 52 Photodiodes - Communications Bio-Sensings Measurements and High-Energy Physics The RCE was also measured with those three different system configurations. Figure shows the experimental data and the theoretical data that are calculated with the equation . In the full components configuration system the RCE experimental data coincide within 2 dB with the theoretical data. In the coaxial cable components configuration system there was a little discrepancy .
