photodetector in optisystem

[gaganpreet Kaur]

In optisystem what is the value of ‘sample rate’ required to be chosen for PIN phodetector

[Ashu verma]

Hello Gagandeep kaur
First of all welcome to optiwave optisystem,i would suggest you to read optisystem mannual for better understanding.There is good explanation of every component.As far as your question is concernd,this is how can we find the sample rAte
It depends upon the Bit rate ,sample you are taking to sample one bit i.e sample/bit and sequence length.
Number of samples=sequence length*sample per bit
Sampling interval=Time window/no. Of samples
Samlpe rate=1/sampling interval
For better informAtion see this link

40 Gb/s Single Channel Transmission in Standard Mode Fibers (SMF)

Regards

[gaganpreet Kaur]

Thank u so much for explaining things. actually i was working on design of UDWDM system at high data rates and script value was not working

[Ashu verma]

Welcome gagandeep kaur,uDWDM is a great area of research to fulfill the ever increasing demands of internet and speed.As you are working on ultra dense spacing,keeo in mind about fiber non linearities,because crosstalk increase due to less spacings.If you will need any help,share with forum members and you will get the appropriate response.Best of luck for your research work.

[Taiwo Ambali Abiola]

In addition, as for Photodetector, it automatically changes whenever you change your bit rate or sample per bit on the global parameter. It is running on script and it is (5*sample rate).

So, I don’t think you need to change it manually.

[Ravil]

Hi gaganpreet,

The two very good answers were given according to your question by Sam Sung and Taiwo. From myself, I just want to add that you should always need to make sure that you are working with global parameters (which can be reached by double click on your scheme layout) to have the changes made automatically!

[gaganpreet Kaur]

thank u so much for this but i have set my global values i layout parameters but still script value of sample rate was not giving me best Q factor . i randomly changed the value and Q factor improved . so i just needed to understand what and how to detrmine value of sample rate .samsung made it clear and surely it helped me.
thanks

[Ashu verma]

Hello gagandeep
You can share your system file(if you can) to solve your problem.Otherwise you can elaborate you objectives for better understanding to your topic.Are you working on more number of channels with ultra narrow spacings or only channel spacing?

[gaganpreet Kaur]

Thanks again my area of research is study of non-linearities only and basically its FWM . Surely i look forward to support from the forum

[Ravil]

You are welcome, gaganpreet! As forum members we are always glad to help you whenever we can. The support team is very helpful as well. Good luck with your future work on your topic! Let us know if you have any other questions.

[Abhishek Shrama]

check the following papers as they are of exact same domain as yours:

http://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0CCAQFjAAahUKEwjZ8IXE8tzGAhViHKYKHVypBn8&url=http%3A%2F%2Fwww.sciencedirect.com%2Fscience%2Farticle%2Fpii%2FS0030402609003295&ei=ejGmVdnLNuK4mAXc0pr4Bw&usg=AFQjCNHCQ8DM6BrbJF9J9vOZN8LHjE4awg&sig2=RYR-2BUeXyun2IUuakNJQg&bvm=bv.97653015,d.dGY

http://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0CCMQFjAAahUKEwj0ubG88tzGAhXGLaYKHVX-API&url=http%3A%2F%2Fwww.sciencedirect.com%2Fscience%2Farticle%2Fpii%2FS0030402607002240&ei=ajGmVfTcMsbbmAXV_IOQDw&usg=AFQjCNFtQbByOgX3j92Mat8TNkNh3S1-9Q&sig2=36899qDzpDANFXwAtXvFPQ&bvm=bv.97653015,d.dGY

http://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0CB4QFjAAahUKEwjGoe2x8tzGAhUjIqYKHXfQC_o&url=http%3A%2F%2Fwww.sciencedirect.com%2Fscience%2Farticle%2Fpii%2FS0030402607001702&ei=VDGmVcanLaPEmAX3oK_QDw&usg=AFQjCNEUjUL6RJGpijzMqqTFhAcvje6WNw&sig2=cAFd6TTYKr6aJvbKXWbJJw&bvm=bv.97653015,d.dGY

[gaganpreet Kaur]

yup me working on increased no of channels at narrow channel spacing

[Ashu verma]

Hello Gaganpreet kaur
If you are working on more number of channels and dense channel spacings as you mentioned earlier.You can mitigate the effects of non linearities by using following things
1. Low input power
2. Use of low factor of gamma of fiber
3. you can use DSP to compensate the effects of non linearities
5. Broad band amplification
6. Correct frequency band
Also matlab will be the best solution to your system

[gaganpreet Kaur]

i am working on parameters almost to what you suggested as high input power etc coz we are trying to exploit them not mitigate them.

[Ashu verma]

Hello gaganpreet kaur,
I have given following points to reduce the effect of non-linearities because WDM system design for high number of channels and ultra-narrow spacing can only be realized by taking these factors in account. However, you want to exploit the effect of non-linearities you can use high power. Study of non-linearities was part of my previous study and it would be my pleasure if i can help you in this study because this is the great area of research and my command is good in this particular area.

[Rana Babar Ali]

I want to make 1024 Qam, If any one have id please suggest me.

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