Home Forums SYSTEM XOR GATE OUTPUT

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    • #14065
      vipul
      Participant

      HELLO TO ALL
      I HAVE DESIGNED XOR GATE BASED ON XPM , USING CONTINUOUS WAVE AS INPUT TO INTERFEROMETER HAVING FREQUENCY 1540 NM ,AND TWO DATA SIGNALS WHICH IS TO BE XORED AT 1545NM.BEFORE OPTICAL RECIEVER THERE IS GAUSSIAN FILTER.IF I CHANGE THE VALUE OF GAUSSIAN FILTER FREQUENCY TO 1540 I AM GETTING WRONG XOR OUTPUT(WHICH IS CONCEPT OF XPM) OF DATA SIGNALS .HOWEVER IF I KEEP DEFAULT VALUE OF FREQ OF GAUSSIAN FILTER(193.1Thz) I AM GETTING CORRECT XOR OUTPUT .SEEING THE SPECTRUM OF OPTICAL SIGNAL AFTER GAUSSIAN FILTER(FREQ 193.1Thz) WE CAN SEE THAT BOTH FREQ COMPONENT -1545NM AND 1540 NM ARE ENTERING INTO RECIEVER.I WOULD LIKE TO KNOW HOW THESE TWO SIGNALS ARE ACTING TOGETHER IN AN INTERFEROMETER SO THAT WE ARE GETTING XOR OUTPUT?

      WAITING FOR REPLY EAGERLY
      THANK YOU

    • #14094
      Damian Marek
      Participant

      Hi,

      Is there a specific paper you are trying to reproduce? I am not very familiar with the SOA XOR gate.

      Regards

    • #14161
      vipul
      Participant

      Thank u Damian for yr concern.I am attaching a paper in which xor operation is performed .The xor gate designed by me is giving correct xor value(attached) but i am unable to understand the principle behind getting an xor value at output of interferometer.

      • #14201
        Damian Marek
        Participant

        I think the paper does a pretty good job of explaining it. The two signals are used to induce phase shifts into a pair of control signals. The trickiest part may be realizing that a signal that is coupled through an X coupler will have a phase shift of Pi/2 on the opposite output port.

    • #14516
      vipul
      Participant

      HI ALL
      I AM UNABLE TO GENERATE xor OUTPUT(PROJECT ATTACHED) IF I INCREASE SPEED TO 40 Gbps.CAN ANYBODY HELP

      • #14526
        Damian Marek
        Participant

        Perhaps the SOA’s time response is not quick enough for those speeds. I don’t see your project file could you try uploading it again.

    • #14708
      siva rama krishna
      Participant

      Hi Vipul,
      I need some help from you.
      I ran the your xor-gate.osd file and getting wrong xor output even Optical filter frequency is set as 193.1 Thz
      Input A=11011001
      Input B=10110110
      Output Should be 01101111

      I am not getting this output.

      How can measure ouput power for XOR,AND and OR gate.
      Attached my XOR output image.

      Please provide your help to solve this issue.

      Thanks
      Siva Rama Krishna

    • #14718
      vipul
      Participant

      Hi shiva u aRE GETTING RIGHT OUTPUT AS I CAN SEE IN FIGURE.THE OUTPUT IS REPEATED 0110111101101111

    • #14726
      siva rama krishna
      Participant

      Hi Vipul. Thanks for ur reply.

      Got correct result after setting Freuency[0] and Frequency[1] of WDM Mux are 1545 and 1540 nm respectively.Previously ran with default settings of WDM Mux.

      OR gate ouput is coming as for some combinations of Inputs only
      I tried for this combinatation
      A=111111
      B=100001
      Output should be 111111
      but my output is coming as different

      Please help me

      Thanks
      Siva Rama Krishna

      • #15215
        Damian Marek
        Participant

        I saw something similar happen to one of Vipul’s projects. The problem was with the filters not set properly (bandwidth and center frequency). Using a spectrum analyzer make sure that you are filtering correctly.

    • #15194
      siva rama krishna
      Participant

      Please anyone help me to solve.

    • #15321
      vipul
      Participant

      HELLO SIVA
      THE ERROR IN OUTPUT IS BECAUSE OF CARRIER RECOVERY LIMITATION IN SOA .WHENEVER LONG STING OF PULSES (CONTINOUS 1) TRAVELS THROUGH SOA THERE IS A PROBLEM OF CARRIER RECOVERY (EACH PULSE ABSORBS ACTIVE CARRIER IN SOA …MANY PULSES CAUSES IN DEPLETION OF CARRIERS) IN SOA.MORE DETAIL U CAN FIND IN INTERNET SIVA JUST TYPE ” CARRIER RECOVERY TIME IN SOA” OR
      http://www.opticsinfobase.org/ol/abstract.cfm?uri=ol-27-18-1625

      http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=5405172&url=http%3A%2F%2Fieeexplore.ieee.org%2Fiel5%2F5361200%2F5405166%2F05405172.pdf%3Farnumber%3D5405172

    • #15622
      siva rama krishna
      Participant

      Thanks vipul for your answer.

    • #15727
      Saurav Chanda
      Participant

      Hi Vipul, Its because of constructive and destructive interferences which occur inside the SOA, the in phase and out phase concept applies here.

    • #15730
      siva rama krishna
      Participant

      Hi Saurav,

      have u any idea of how to get correct output in OR gate for the combination what ever i mentioned in previous posts.Which parameters have to be changed to get correct output?
      (A=111111 , B=100001, output=111111)

      Thanks in advance.

    • #15746
      Saurav Chanda
      Participant

      Hey Siva, well all I can say is just try to tune the frequency, probably this would help you out to get the desired output.

    • #15831
      siva rama krishna
      Participant

      Hi Saurav,
      After tuning BPF frequency to 1545nm correct output is coming for above mentioned input combination.
      Again it is giving wrong result for the following combination.
      A=111111
      B=101001

      The output is different from actual values.

    • #15834
      Saurav Chanda
      Participant

      Try to check at 1550 or 1645. Well try other combinations too apart from the one as you’ve mentioned.

    • #15840
      siva rama krishna
      Participant

      Hi Saurav,
      I tried to tune with wavelentghs but wrong output is coming.
      I have attached my files(see layout 2).

    • #15858
      vipul
      Participant

      Hi siva
      i can see that number of inputs in upper arm is 7 and lower is 6.but after correcting it still the output is not coming.This xor gate is not using laser light as CW beam so it is not working on the principle of xpm.so i am not sure how to correct it

    • #15869
      siva rama krishna
      Participant

      Please anyone help me to solve this issue.

      Thanks in Advance
      Siva Rama Krishna

    • #15898
      Saurav Chanda
      Participant

      Hi Siva,
      Try to calculate the operating frequency by matlab or by some equations, you may refer to Niloy K Dutta for any reference related to SOA,XPM,SPM and Gates. I am out of station else I could have checked. Hope it helps you out.

      Regards,
      Saurav

    • #19892
      himadri mandal
      Participant

      Hi friends ,
      I am not getting my XOR gate out put,can any body help me to correct my XOR….please.I cant find where I’m doing wrong.
      I am attaching my project.please solve this issue …

    • #19928
      himadri mandal
      Participant

      Hi vipul,

      Please help me,to simulate XOR gate.I tried but getting wrong output.I am sending the project file and output that I get.Please help me.
      Thanking you.
      Himadri

    • #20006
      Saurav Chanda
      Participant

      Hello Himadri, Well are you using optiFDTD to simulate your structure or some other software. Attach the structure so that I get to know.

      Regards,
      Sourav

    • #20080
      himadri mandal
      Participant

      Thanks for your reply….I used optisystem 7.I am attaching the file for your reference.
      Thanking you
      Himadri.

    • #20087
      himadri mandal
      Participant

      Saurav — this is my file.

    • #20099
      Abhishek Shrama
      Participant

      Hi everyone ,I have read all your discussions and going to attach a XOR gate.
      Himadri i have made several changes in your system .Find the XOR gate in attachment

    • #20232
      himadri mandal
      Participant

      Thanks Abhishek Sharma for you xor gate…but problem is that If I cascade two xor gate I am not getting desired output…is there any solution of this?I xor ed 2 input and then use another xor gate with another input + previous stage output but did not get desired response.I could not understand how to fix the problem.expecting your help to fix it up.
      I am attaching my design.please help me.

    • #20233
      himadri mandal
      Participant

      here is my design

    • #20236
      Abhishek Shrama
      Participant

      Ok himadri,i will try to do this 🙂

    • #20238
      Abhishek Shrama
      Participant

      Hello himadari,i saw your setup and found the output from first stage XOR at 1540 nm ,which you are getting from filter.For the XOR opration you have to input two different wavelengths as u did in former one.Because this gate is based on XPM .For this you can convert frequency with wavelength converter.
      Try this and i will also try this

    • #22361
      Varinder Verma
      Participant

      thankyou sharma for giving design of XOR gate. I used the same and it worked. Thanks a lot

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