Learning Forum

[apoynter1]

Hi,

I am simulating the final stage of an MQW laser in Interconnect to output the LI curves. However, I want to include losses due to free carrier absorption in doped cladding layers. How do I define the doped cladding layers such that this coefficient can be multiplied by the dopant carrier density such that the loses can be calculated. In addition the laser appears to be simulating with sufficient gain from MQW yet the LI curve suggests that the laser does not lase.

[Guanhui Wang]

Hi alfapoy TWLM has two optical loss options: "loss" and "loss density coefficient". "loss" is for constant loss (independent of density) and "loss density coefficient" is for loss that depends on the quantum well density. If the doping density is constant you can just use "loss" but first you need to calculate the optical loss (e.g. using MODE with some FCA model).

[apoynter1]

Thank you for the reply. As MODE does not allow for doped materials(which my cladding layers are), how might loss through free carrier absorption be calculated in MODE, the documentation for MQW Edge Emitting laser eludes to this however I am unsure on how? The confinement factor for the model has been simulated in MODE and parsed into MQW for then simulating in INTERCONNECT, as per the example. However I am unsure on which loss mechanisms are accounted for in this example as the dopant levels of layers cannot be defined for free carrier absorption calculations. Does MODE have an alternate way of calculating these values to then be parsed into the TWLM simulation?