- This topic has 11 replies, 4 voices, and was last updated 9 years, 5 months ago by
gherbi mohamed.
-
AuthorPosts
-
-
May 8, 2014 at 12:32 pm #11396
Dr. Hamza M. R. Al-Khafaji
SpectatorDear All,
In OCDMA systems, Hadamard code is used for bipolar encoding. when bit 1 is transmitted light is sent to encoder while bit 0 is encoded by the complementary of the encoder. How to implement this system ? any idea about how to switch the data bits ?, thank you.Dr. Hamza
-
May 13, 2014 at 12:34 pm #11484
Dr. Hamza M. R. Al-Khafaji
SpectatorNo answer !!
-
May 15, 2014 at 3:10 pm #11589
Damian Marek
ParticipantHi Dr. Hamza,
Sorry for the wait. I’m not very familiar with Hadamard code. Do you have a scientific article you are trying to reproduce, that could help me understand your problem a bit more?
We have an example of OCDMA and we use fiber bragg gratings to emulate encoders/decoders at the following link:
Thanks
-
May 16, 2014 at 1:21 am #11609
Dr. Hamza M. R. Al-Khafaji
SpectatorHi Damian Marek,
Have a nice day..I hope you reply me faster.. In the attached file, when bit 1 is transmitted light is sent to encoder while bit 0 is encoded by the complementary of the encoder. How to implement the red colour part of this system ? any idea about how to make switching for the data bits ?, thank you.
Dr. Hamza
-
May 16, 2014 at 1:33 am #11612
Dr. Hamza M. R. Al-Khafaji
SpectatorHi Damian Marek,
Have a nice day..I hope you reply me faster.. In the attached file, when bit 1 is transmitted light is sent to encoder while bit 0 is encoded by the complementary of the encoder. How to implement the red colour part of this system ? any idea about how to make switching for the data bits ?, thank you.
Dr. Hamza
-
May 16, 2014 at 10:32 am #11638
Damian Marek
ParticipantHi,
I have made an optical switch layout for you. It uses couplers and phase modulation to direct the incident light to either the first or second port of the final coupler. I am not sure how you are modulating the signal so I used a train of Gaussian pulses. Using the user defined bit sequence generator you can choose which bit is 1 and then route it accordingly.
Hope this helps!
-
-
May 16, 2014 at 5:22 pm #11678
Dr. Hamza M. R. Al-Khafaji
SpectatorHi Damian Marek,
Good day..Can you please modify the design without phase modulation ? Why you used “user defined bit sequence” ? and what is the setting of these “user defined bit sequence” components?, thank you.
Dr. Hamza
-
June 17, 2014 at 7:01 pm #12058
Dr. Hamza M. R. Al-Khafaji
SpectatorHi Damian Marek,
Good day..Can you please modify the design without phase modulation ? Why you used “user defined bit sequence” ? and what is the setting of these “user defined bit sequence” components?, thank you.
Dr. Hamza
-
June 18, 2014 at 9:33 am #12077
Damian Marek
ParticipantThanks for reminding me Dr. Hamza! Jaffar is correct about the use of the User Defined Bit Sequence generator, it is to control the switch, so that a binary 1 is switched up and a binary 0 is switched to the bottom port.
I have attached an amplitude modulated switch, you can replace the CW Laser with your input signal.
Hope this helps!
-
-
June 18, 2014 at 7:24 am #12072
Jaffar Emad Kadum
ParticipantDr.Hamza,
the first user defined bit sequence is used to modulate the light wave. the second user defined bit sequence is used to set the switching speed. i think the phase modulator is essential to perform switching function by switching the polarization of light.
-
April 2, 2015 at 7:57 am #19229
gherbi mohamed
Participanthi,
can anyone help me to desing a SAC OCDMA based on tow code keying -
April 3, 2015 at 9:44 am #19260
gherbi mohamed
Participanthi Dr.Hamza,
can you help me because its your idea
-
-
AuthorPosts
- You must be logged in to reply to this topic.