photo detector sensetivity

[mohammed hosni]

please i need your help my friends to calculate the photodetector sensitivity by using the parameters in pin or APD Ooptisystem component such as thermal noise is 1e-22 w/hz

[aasif bashir dar]

hi mohammad hosni,

for this you require to create a simple design to to calculate the photodetector sensitivity,in optisystem as:

laser source(with or with out modulationdepending on your requirement)—–>detector(PIN or APD)

there after you require to set the parameters like power of laser,thermal noise,etc as require by you.and simulate.

with regards

[Aabid Baba]

Hello mohammad,
The sensitivity of a receiver can be calculated if one knows the following performance parameters: the noise figure (NF), the ENBW, and the carrier to noise ratio (C/N) required to achieve the desired quality signal.
The sensitivity is as follows:

Sensitivity=10×log10(kTB)+NF+C⁄N

This equation defines the signal power in dB·Watts that is present at the demodulator for a desired carrier to noise ratio. Let’s explain each of the terms in this equation. Hope it is helpful.

Regards

[Aabid Baba]

I would also like to say that the resulting noise is in Joules/Second or Watts. To convert the noise power to dB·Watts, use 10 times the log of the noise power in watts. If we look at the normalized (B = 1 Hz bandwidth) noise floor equation, we have:

Noisefloor=10×log10(k×T×B)

I am posting a link. You can please refer to it.
http://www.highfrequencyelectronics.com/index.php?option=com_content&view=article&id=553:receiver-sensitivity-and-equivalent-noise-bandwidth&catid=94:2014-06-june-articles&Itemid=189

Regards

[aasif bashir dar]

hi mohammed hosni

aabid baba has solved your problem your large extend, how so ever you will have encountered them equation before post your query in forum.

if you have perticular problem related to how to do it in the optisystem.you can upload your .osd file or screen shot here for further discussion

[mohammed hosni]

but mr aabid baba the parameters you have mentioned doesn’t exit in pin photo detector component layout

[alistu]

Hi Mohammed,

Please have a look at Damian’s answer to more or less the same question asked by me a while ago. There is also a file from OptiSystem old lab assignments which you may find useful if the answer itself is not explicit enough (even though I believe it to be):

CO-OFDM Architecture

Regards

[aasif bashir dar]

hi mohammed hosni,
i think links contains all what you need for receiver sensitiviy evaluation in optisystem,

Extracting the Thermal Noise Parameter for a Specific Receiver Sensitivity

Receiver Noise—PIN

Receiver Noise—Shot Noise Enhancement with APD

Sensitivity degradation—Extinction ratio

with regards

[mohammed hosni]

dr Alistu THE link is unavilable

[aasif bashir dar]

hi mohammed hosni,

i checked the links for you they are available,
if you still have the problem in visiting the links, i suggest you to search receiver sensivity in optiwave search engine, you will get them all there

with regards

[aasif bashir dar]

alistu’s link is also available

[mohammed hosni]

there is link inside the alistu’s link is unavialable

[alistu]

You are right. The old lessons are deleted apparently. However, the new set of lab assignments has also the receiver sensitivity lesson. Please download instructions file of lesson six (receiver sensitivity) in the link addressed below:

OptiSystem Lab Assignments

Regards

[mohammed hosni]

how to use the parameter thermal noise is 1e-22 w/hz in sensetivity calculation

[alistu]

In the paper I have addressed above, receiver bandwidth and thermal noise spectral density are considered to calculate the rms thermal noise current, another parameter needed to calculate sensitivity along with photodiode responsivity. Please ask any questions you may find in case.

Regards

[Ranjeet Kumar]

Hi,
http://depts.washington.edu/mictech/optics/me557/detector.pdf

We have to know various parameters like responsivity, noise figure and diode currents.

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