Optimization of double diffused floating guarding ring InGaAs/InP avalanche photodiodes

In this study, the double diffused FGR structure of a high-speed InGaAs/InP APD was optimized from both theoretical analysis and experimental results. A high-speed edge-breakdown-free APD with gain of more than 10 was demonstrated following the design rule. Noise of this APD was measured and analyzed incorporating the dead-space effect.