
Bipolar Encoding
Dear 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
Responses (11):
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May 8, 2014 at 12:32 pm #11396
Dear 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
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May 13, 2014 at 12:34 pm #11484
No answer !!
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May 15, 2014 at 3:10 pm #11589
Hi 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
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May 16, 2014 at 1:21 am #11609
Hi 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
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May 16, 2014 at 1:33 am #11612
Hi 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
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May 16, 2014 at 10:32 am #11638
Hi,
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!
+1
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May 16, 2014 at 5:22 pm #11678
Hi 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
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June 17, 2014 at 7:01 pm #12058
Hi 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
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June 18, 2014 at 9:33 am #12077
Thanks 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!
Attachments:
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June 18, 2014 at 7:24 am #12072
Dr.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.
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April 2, 2015 at 7:57 am #19229
hi,
can anyone help me to desing a SAC OCDMA based on tow code keying -
April 3, 2015 at 9:44 am #19260
hi Dr.Hamza,
can you help me because its your idea
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