active combiner for dithering

[Felix Wijaya]

Hi everyone,
I’m working on a Radio over Fiber (RoF) simulation with QAM modulation in OptiSystem. I want to apply dithering to the electrical signal before optical modulation, so I’m looking for an active electrical signal combiner to mix the main signal with the dither.

Is there such a component in OptiSystem? Or is there any suggested workaround?

Also, what’s the difference between an active signal combiner and a regular (passive) one in this context?

Thanks in advance!

[Saurabh Bedi]

Dear Felix,

Thanks for reaching out to us!

Dithering of the laser can be done by directly modulating the applied current to the laser. You can use directly modulated laser for dithering and external modulators for data. This is a very good workaround.

Active signal combiner would include amplifier in it. That can be done by adding electrical or optical amplifier to its input ports depending on the type of combiner. In the passive signal combiner, the passive components are used without the use of external power.

Hope this helps?

Best,
Saurabh Bedi.

[Saurabh Bedi]

Hi Felix,

Also, it is possible to have a combiner (active combiner) and add the modulating signal with the dither signal and externally modulating the laser. This is another option. There is no specific component called active combiner however, it is possible to create subsystem using the regular combiner with amplifier as I’ve described earlier.

Best,
Saurabh Bedi.

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