Light Absorption Efficiency-Improved GE on Si P-I-N Photodetector by Using Step-Chirped Bragg Grating
In this paper, simulation result and analysis of Ge on Si p-i-n photodetector with step-chirped Bragg grating is
represented. Lumerical software with FDTD (Finite Difference Time Domain) solutions is used for simulation. Simulation
performance is analyzed in terms of grating period, light absorption efficiency, and absorption length. Light absorption
efficiency increment of12.21% at 1.55 μmwas achievedwith 12-μm long absorption length.
Index Terms- Step Chirped Bragg Grating, Ge Photodetector, Light Absorption Efficiency, Silicon Photonics