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    • #14989
      boldoo
      Participant

      Dear all,

      how to draw clear 2ASK ?

    • #15023
      Damian Marek
      Participant

      Couldn’t you use a simple externally modulated laser for ASK? I don’t believe you need a coherent type setup. If not could you attach an article or explanation of 2ASK?

      Thanks

    • #15024
      Ravil
      Participant

      I agree with Damian, regular 2ASK format doesn’t require coherent detection (can’t open your scheme for some reason…)

    • #15061
      boldoo
      Participant

      Hi

      need change Receiver? then how to see 2ASK constellation map?

      But if it is succeeded, I will add phase modulation, fiber and QAM receiver. My final aim is square-16QAM constellation.

      • #15078
        Damian Marek
        Participant

        Wouldn’t a simple NRZ signal be considered 2ASK? If so I think the constellation diagram would be as simple as the one attached. The signal varies between two values 1 and 0 and the phase is always the same.

    • #15083
      Ravil
      Participant

      NRZ and RZ format just defines the bit interval duration and in my opinion 2 of them can be used for 2ASK.

    • #15084
      Ravil
      Participant

      The presented constellation diagram belongs to ASK, I think. For 2ASK we should have 2 different values of amplitudes on axis if I’m not mistaken…

      • #15133
        Damian Marek
        Participant

        Ok, but then that would be exactly the same as BPSK, which is not necessarily a bad thing. Boldoo let us know what constellation diagram you want. If it is what Ravil suggested then you could simply use a 2-QAM or BPSK modulator.

    • #15181
      boldoo
      Participant

      Dears, since I need to draw 16QAM constellation, I asked about 2ASK. then I drew attached fig.

      is it 16QAM right? there is any requirement?

      • #15209
        Damian Marek
        Participant

        Hi Boldoo,

        That looks exactly like 16-QAM glad we could help. In this case you could have used our QAM components to create the constellation diagram, but nevertheless it indeed looks correct.

        Cheers!

    • #15336
      boldoo
      Participant

      thanks Damian,

      now that 16QAM pass through fibers, constellation is rotated as certain phase. but i can’t fix this to correct phase. You can see another post of mine.

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