Duobinary Transmitter

[siva rama krishna]

Hi,
I am designing Duobinary modulation over SMF fiber and i need some clarifications
1) can we replace precoder and adder circuit with Bessel electrical low pass filter.If possible provide circuit diagram and filter specification i need.
2) In modified duobinary can i replace precoder and sub-tractor circuit with high pass filter? Please provide details.
3) Before detector circuit(after transmitted with fiber) can i user Bandpass Bessel filter. Please provide its importance and parameter specifications.
4)Duobinary modulation using symmetrical structure.

Advance in Thanks
Siva Rama Krishna

[Tech Support]

Thank you for your query. Unfortunately we are not very familiar with the techniques you describe below. We did however find a paper (attached) which discusses using FIR filters in combination with a low pass filter to generate duo-binary signals. Possibly this will help you with your design query.

Sorry for not being able to respond in greater detail.

We hope the enclosed information helps!

Attachments:

1. DuobinaryModulationForOpticalSystems.pdf

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