ODB with Filters Modulation

[siva rama krishnaParticipant]

Hi,

1)In ODB with Filters Modulation example can u explain how Gain of EDFA amplifiers are calculated not only in this example in many examples how EDFA gain values are determined?Is gain based on bait rate and fiber length?
2) How to calculate Bandwidth of Optical Bessel filter and Low pass Electrical Bessel filter?
3) RZ pulse is obtained from NRZ by adding another MZM with Sine generator.How this operation will work and what is frequency and phase of Sine Generator?

Thanks and Regards
Siva Rama Krishna

[siva rama krishnaParticipant]

Please provide reply on this question.

[Damian MarekParticipant]

We are currently looking into this.

[Damian MarekParticipant]

Sorry for the slow response, here are the answers to your questions.

1)
Please have a look at the help documentation for the “Er Doped Fiber”. It actually does quite a good job at explaining the calculation of the gain.

2)
The bandwidth of the filter is a parameter you set. It depends on the signals bandwidth. For example for the DSP the best bandwidth of the electrical Bessel filter is 0.75*Symbol rate. For the optical filter we generally choose it to be larger than the signals bandwidth. In WDM applications you should make the bandwidth large enough to get all the signal but not too large to overlap the other channels.

3)
Please look in “OptiSystem12 Samples / Advanced Modulation Systems / RZ (50RZ, 33RZ, 67CSRZ, Chirped, Alternate-Chirp, VSB)”. We show a number of designs.