IF to RF conversion

[muhammad saqlain]

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.

[Mohamed A. A. Abouseif]

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

hope that helps to solve your problem.
thanks
Mohamed Abouseif

[muhammad saqlain]

Ok i try but in my opinion, electrical multiplier does not have the same characteristics of electrical mixer.

[Mohamed A. A. Abouseif]

Try it and let us discuss!!

[muhammad saqlain]

ok dear Mohamed.

[muhammad saqlain]

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”!!! .

[muhammad saqlain]

find the missed attachment from the trailing post.

Attachments:

1. 

   1-a.png
   

2. 

   2-a.png
   

[muhammad jawad]

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

[muhammad saqlain]

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.

[muhammad jawad]

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

[muhammad saqlain]

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.

[Author]

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