[Debanjan SarkarParticipant]

Thank you both of u.

[Debanjan SarkarParticipant]

thank you. and what about 66% dpsk and 67% rz dpsk .are they same? can any one suggest me any paper or book so that i clear my doubt regarding these things?

[Debanjan SarkarParticipant]

Thank you both of you.
I have one more confusion..i have one example in .osd of 66% RZ dpsk. Is it same as 67% RZ dpsk??

[Debanjan SarkarParticipant]

thank you

[Debanjan SarkarParticipant]

thank you alistu. but can you tell me reason why Q value is almost constant??

[Debanjan SarkarParticipant]

For what reason this Q value is constant irrespective of any value of laser power. In practical scenario this should not occur. Can you suggest how I can plot the BER curves in this particular case.

[Debanjan SarkarParticipant]

thank you alistu. i will try.

[Debanjan SarkarParticipant]

ok thank you..alistu

[Debanjan SarkarParticipant]

sorry for late reply. Actually i have taken the concept from radio over fiber scm ask.osd as given in example.
Thanks

[Debanjan SarkarParticipant]

Hi all..waiting for your reply.

[Debanjan SarkarParticipant]

Dear alistu thanks for your help and i have successfully implemented my circuit and it is working properly with pam decoder.
thanks to all.
regards
Debanjan

[Debanjan SarkarParticipant]

Thank you alistu. I will check and let you know.
regards
Debanjan

[Debanjan SarkarParticipant]

Dear alistu
I have changed the cutoff frequency but the output waveform is different from input sequence.
You can check with lower no. of bit sequence suppose 8 bit and sample per bit= 4.
regards

[Debanjan SarkarParticipant]

Sorry alistu. I have done mistake ,Amplitude should be -1 1.Thank you.

[Debanjan SarkarParticipant]

Thanks to all.
I have not used any generator or decoder. so i cant use psk decoder or any other decoder.

Actually what i want to do is- I have used 8 bit stream. I have to divide it to I-arm i.e.even position bits and Q-arm i.e. Odd position bit. SO i have used Serial to parallel Converter. then i multiplied both the arm with cosine and sine wave receptively. Then i add the signal and send for receiver.
IN receiver section i have follow the reverse process and at a stage i need to detect my signal so i used m-ary threshold detector in both arm. after that i need a parallel to serial converter as in transmitter section i used serial to parallel converter. but due to different signal type of output of threshold detector and input of converter i am unable to connect . please find the attachment where i have shown portion of my problem.
please give a solution .
regards

Attachments:

1. optwave_forum.osd