Design of a coupling lens assembly and study on the impact of optical misalignments and variations of lens assembly on BER of a system

There is an increase in demand for high speed photodetectors in optical fiber networks for both short and long-haul applications with the continuously increasing demand in bandwidth. The main challenges in this direction is the focusing of light into small areas, as a slight misalignment in the assembly can lead to degradation of the system performance. In this paper, we design a lens assembly using a ball lens with a parabolic mirror and study the impact of lateral misalignments between fiber and ball lens and at the detector on the system performance using CodeV and Synopsys RSoft ModeSYS® tool.