How to calculate the GAIN of the ONA in the Interconnect.

- June 10, 2023 at 7:36 am
  
  Toshinori Ninomiya
  Subscriber
  
  Hi.
  I want to analyze the ring modulator. I use the example that demonstrates the simulation of a ring modulator (https://optics.ansys.com/hc/en-us/articles/360042322794).
  
  I set some parameters and characterized separately using device-level simulations. In addition, I combined building blocks into a circuit in INTERCONNECT.
  
  Here, I have a question. I want to confirm how to calculate the gain in the ONA. In the step 5 of the simulation (https://optics.ansys.com/hc/en-us/articles/360042322794), we can get the transmission spectrum from gain. I use this step, and I can get results.
  
  Also, I use power meter in the through port and drop port in the ring. Then, I can get the output power as input light wavelength seep. From the results of the power meter, I calculate the transmission [dB].
  
  Here, there are big different between result from ONA(gain) and power meter(transmission).
  
  Therefore, I want to know How to calculate gain in the ONA.
- July 5, 2023 at 6:35 pm
  
  GWANG
  Ansys Employee
  
  Hi Toshinori Ninomiya,
  The gain measured in ONA is the power transmission gain, for example, if the power is decreased by 2 dB, the the gain is -2 dB. So it's different than the power transmission.