Thermal power density in PIN

[MUKESH KUMAR GUPTA]

how thermal power density in PIN detector effects its performance and what is limit of thermal power density..attach snapshot of that window.

[alistu]

Hi Mukesh,

Thermal power density corresponds to the thermal noise that affects the signal processed in the photodetector. It is the power density of the famous unavoidable thermal noise which is caused by the random thermal motion of electrons. To see the mathematical relationship of how the noise is based on the power density, please have a look at the help section of the photodetector component. And the possible range of thermal power density in Optisysetm is between 0 and 1e+100.

Regards

[Ashu verma]

Hello Mukesh
Definition and basic idea is given above and i just want to add that With the increase in thermal noise SNR decreases.However you can go to the optiwave examples in which effect of thermal noise and shot has been investigated

Receiver Noise—PIN

Moreover if you need to know about basic calculation of all the noises in photodetector then visit this link
http://optical-technologies.info/noise-in-photodetectors/
For deep study i would refer you GP Aggarwal’s book on fiber communication.
Last link to understand performance of PIN and APD in same systems when calculated with thermal noise and without.
http://www.researchgate.net/publication/256820780_Performance_comparisons_between_PIN_and_APD_photodetectors_for_use_in_optical_communication_systems

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