Optical transmitter component

[Thomas Freir]

Hi, I have two questions regarding the attached simulation.
I have two links. One using the optical transmitter component and the second using a CW laser, Mach Zender modulator and PRBS.

First Question
Both systems are nominally the same. When I run a simulation I can get a measurement of both lins BER using the BER analyser. (the two results are different, I not worried that they are different). If I run the simulation a second time the link using the optical transmitter gives the same BER but the lin using the CW laser etc gives a different result. Why is this?

Second Question
Looking at the link using the optical transmitter I sweep the wavelength of the optical transmitter from 1511nm to 1591nm. If I polt the BER versus the wavelength the BER gradually improves. Can anyone give me a reason why. (The optical fibre loss is set to 0.2dB for all wavelengths) See next post for graph.

Attachments:

1. transmitter-Copy.osd

[Thomas Freir]

Graph of wavelength versus BER

Attachments:

1. 

   Wavelength-V-BER.jpg
   

[Thomas Freir]

I figured out the second question, it was the fibre dispersion.
Can anyone from the optisystem team answer the first part.

[Author]

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