Modulation Index Study of a Cost-Effective Solution for CRAN Architecture Based on Coherent Radio-over-Fiber Backhaul

摘要

We study and experimentally evaluate the modulation index influence on Mach-Zehnder Modulator in external modulation at low-radio frequency voltage (2.277 Vpp) to improve the system performance of a coherent receiver based-on 3×3 coupler. The system achieves a sensitivity of ?29 dBm in the error-free condition, after propagation through 60 km-long fiber link at a frequency carrier of 15 GHz, offering a cost-effective solution for centralized radio access network (C-RAN).