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IF to RF conversion

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(joined January 2018)
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Dear All,
i am working on problem to transmit a 5GHz(IF signal) with data rate of 6-7 Gb/s(using simple NRZ modulation format) over a fiber length of 40 Km.In receiver at PD,RF signal (let say 10 GHz(twice of transmitted RF signal)) is detected and finally want to up-convert this 10GHz electrical signal to some higher frequencies(60-90 GHz) using “Mixer” or any other technique.I could not find the component “mixer” in optisystem 15(trail version) library.Looking forward to your valuable suggestion.

Responses (10):

    • #48403
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      muhammad saqlain
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      Dear All,
      i am working on problem to transmit a 5GHz(IF signal) with data rate of 6-7 Gb/s(using simple NRZ modulation format) over a fiber length of 40 Km.In receiver at PD,RF signal (let say 10 GHz(twice of transmitted RF signal)) is detected and finally want to up-convert this 10GHz electrical signal to some higher frequencies(60-90 GHz) using “Mixer” or any other technique.I could not find the component “mixer” in optisystem 15(trail version) library.Looking forward to your valuable suggestion.

    • #48411

      Dear Muhammad,
      you can use the Electrical Multiplier as a mixer.

      hope that helps to solve your problem.
      thanks
      Mohamed Abouseif

    • #48415
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      muhammad saqlain
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      Ok i try but in my opinion, electrical multiplier does not have the same characteristics of electrical mixer.

    • #48416

      Try it and let us discuss!!

    • #48417
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      muhammad saqlain
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      ok dear Mohamed.

    • #48519
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      muhammad saqlain
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      Dear Mohamed,i share my simulation result.please see the attachment(snapshots) one by one start from 1) photo-diode output 2)output of electrical multiplier (supposed to be electrical mixer),this multiplier is driven by 60GHz sinusoidal signal and one input from photo-diode.I look forward to your valuable comments to clear it whether it is working like a “ELECTRICAL MIXER”!!! .

    • #48520
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      muhammad saqlain
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      find the missed attachment from the trailing post.

      Attachments:
    • #48523
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      muhammad jawad
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      Dear
      Use beating technique to upconvert LF RF signal into mm-wave signal by beating two closely spaced wavelengths all-optically.That i know
      In your case what do u mean by MIXER???
      Generally MIXER applied in wireless communication to up or down conversion.In optics, beating serves the same purpose

    • #48524
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      muhammad saqlain
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      dear jawad,i am asking about the electrical mixer concept and i know the beating process.and above received signal at 60GHz after PD is achieved by hetrodying two free lasers.

    • #48525
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      muhammad jawad
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      I again reiterate that the emergence of optical techniques of generating higher carrier frequencies is due to the in-capabilities of electrical components like up and down converters, mixers etc.So may be you can find a component in optisys for mixing but in practical scenario not possible

    • #48526
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      muhammad saqlain
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      let me explain the “ROLE of MIXER” the output would be like (F1+F2 and F1-F2) F1 and F2 are RF signal and Local oscillator frequencies respectively.output of photo-detector (PD) is 60GHz mm-wave signal(RF) with 7Gbps data rate and know the point is how to down convert this signal let say 5GHz.how to down convert it according to mixer basic operating principle.

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