- This topic has 8 replies, 5 voices, and was last updated 9 years, 10 months ago by
Ajesh Kumar N.
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February 9, 2015 at 10:39 am #17506
Ajesh Kumar N
ParticipantHow to do polarisation multiplexing in optisystem?
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February 23, 2015 at 4:53 pm #17731
Damian Marek
ParticipantIt’s as simple as modulating two different lasers with two different bit streams. Check out some of our examples like:
Most of the examples in the Advanced Modulation folder have a variation which utilizes PM.
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May 20, 2015 at 2:08 am #20992
Ajesh Kumar N
ParticipantThanks.. Damian Marek for the reply.
Can you please suggest some techniques to reduce crosstalk in WDM systems.. -
May 20, 2015 at 3:02 am #20994
Abhishek Shrama
ParticipantWelcome ajesh!!
Kindly attach your system for more information.I am suggesting a few ways to reduce crosstalk.See if they could help in improving your system:
1) Use appropriate frequency band for transmission
2) Use less denser channel spacing
3) Use broad band amplifier as now HOA’s are used to reduce crosstalk
4) Linewidth of laser you can decrease
5) Use appropriate bandwidth for WDM MUX and DEMUX
Rest make more clear your objectives.
Regards-
May 20, 2015 at 12:33 pm #21009
Alessandro Festa
ParticipantI also add to your points: reduce launch power/channel
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May 26, 2015 at 2:00 am #21153
Ajesh Kumar N
ParticipantThanks, Abhishek Sharma and Alessandro Festa for your suggestions. I am a beginner in these fields. Can you suggest me how to measure crosstalk in WDM in OptiSytem 13?(Drawing crosstalk versus Input power graph) Can you please attach some examples.
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May 26, 2015 at 2:07 am #21154
Alessandro Festa
ParticipantHi Ajesh, there is no unique way to di that.
For example, if you you could design a system with N channels and change the channel spacing (50GHZ, 100GHz and 200GHz) and see how this impacts the BER at the end of the system. Or you could keep the same spacing, but increase power/channel.
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May 26, 2015 at 7:26 pm #21178
Ravil
ParticipantHi Ajesh,
Alessandro gave a very good explanation about your point: there is no unique way to define crosstalk dependance. The reason for it is a big vicinity of reasons for the crosstalk to happen: dispersion, nonlinearities, intersymbol interference. However, if you are interested just in crosstalk dependence on input power, you will be measuring the crosstalk that originates from nonlinearties. In general, you should have spectral and BER analyzers/visualizers in each channel on your system.
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June 1, 2015 at 11:43 am #21292
Ajesh Kumar N
ParticipantThanks Ravil and Alessandro for the reply. Can you please tell me how to reduce non linear effects using DSP methods and how I could implement that in Optisystem?
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