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Dear all,
I apologize for not presenting the material myself. Thanks to Dan for doing this !
There were some open questions remaining in the discussion:
(i) the dispersion of the fiber
We did not measure dispersion. We used an OFS Allwave ZWP non dispersion shifted fiber, with a zero dispersion wavelength 1302-1322nm according to the datasheet. The EML operated at 1305 nm.
(ii) rise and fall times of plotted signals
Rise and fall times (10 % to 90 %) of the electrical 28 G signals are approx. 18 ps.
(iii) modulator bandwidth
The small signal 3-dB bandwidth of the packaged EML module is 26-27GHz.
(iv) receiver bandwidth
We used an Agilent 86116C Opt.040 Module (65GHz Photodiode) with an 39.8GHz Bessel filter.
(v) Why was an optical amplifier was required in the setup?
The optical receiver (86116C Opt.040) has quite low sensitivity (-3dBm) due to its broadband nature.
I hope that helps a bit …
Best regards,
Martin
Martin Schell
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Fraunhofer-Institut fuer Nachrichtentechnik
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