VCSEL Intrinsic Response Extraction Using $T$-Matrix Formalism

We present a new method to remove the parasitics contribution to the vertical-cavity surface-emitting laser (VCSEL) chip response, in order to obtain the intrinsic
S

₂₁
behavior. We demonstrate that the chip can be split into two cascaded subsystems representing the electrical access and the optical cavity, respectively. An equivalent electrical circuit defining the behavior of the electrical access is combined with
T
-matrix formalism to remove the parasitics contribution from the measured
S

₂₁
response. Results allow us to determine the intrinsic 3-dB bandwidth of the VCSEL.