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Optical Reshaping of 40-Gb/s NRZ and RZ Signals Without Wavelength Conversion

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4 Author(s)
Contestabile, G. ; Scuola Superiore Sant''Anna, Pisa ; Presi, M. ; Proietti, R. ; Ciaramella, E.

We experimentally demonstrate a scheme for all-optical reshaping at 40 Gb/s that is wavelength preserving and transparent to both nonreturn-to-zero and return-to-zero on-off keying signals. Eye-diagram reshaping is confirmed by means of bit-error rate versus threshold measurements on both modulation formats. The scheme is based on cross-gain compression in an semiconductor optical amplifier (SOA) and uses two SOAs that are not in interferometric configuration. Due to its working principle, this method is polarization-independent and suitable, in principle, for higher bit rates.

Published in:

Photonics Technology Letters, IEEE  (Volume:20 ,  Issue: 13 )