Recently we ran into a dilemma. We want to characterize our photodetector devices in Si02/Si substrates (prepared by dry transfer). we have two options
1. To get different fiber coupled LASER sources for i-V and i-t characterizations using our probe station with Keithley semiconductor 4200 parameter analyzer.
2. Do free space setup in our LASER lab but we need to buy Keithley SMUs (Free space lasers with optics are available.
Suggestions needed
1. Which setup to go with (please share from your experience)?
2. Can fast i-t responses be recorded with SMU or Semiconductor Parameter analyzer or we must go with the oscilloscope? If we need to go with oscilloscope, then suggestion on how to pick low level currents near noise floor. (need of lock-in amp)
3. If done in Laser lab, we need to buy additional cable connectors and holders for our substrate that needs to be wirebonded (Actually do not know that exact name of those components, would appreciate anyone responding with knowledge about these accessories).
4. Which (2450, 2634B) and how many SMUs do you think we may need if we opt for free space setup.
Dear Tawsif Ibne Alam ,
I measured the performance of the photodiode using a light emitting diode.
All what I needed is classical laboratory equipment such as pulse generators, sine wave oscillators, power supply oscilloscope and Keithley multimeter.
You can follow the techniques and the set ups in the paper at the link:Conference Paper A comprehensive study of an optical transceiver
Best wishes
Tawsif Ibne Alam, recently very similar question has been discussed:
https://www.researchgate.net/post/What_is_the_right_way_to_do_a_RIN_measurement_of_a_Laser
I hope you will find there some useful details.
Important point is to provide linear intensity measurements. To adjust laser intensity to linear range of your photodiode you should use calibrated light attenuator, filter. Application of Malusmeter for such measurements can give you a way how to precisely calibrate any kind of attenuator: you will measure slope of S0 = U(L) dependence, where U and L are output tension and light intensity for measurements without attenuator, while Sf is similar slope of dependence with attenuator. So trasmission of your attenuator will be
T = Sf / S0.
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