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Quantum-dot semiconductor optical amplifier for filter-assisted 80-Gb/s wavelength conversion

: Bimberg, D.; Schmeckebier, H.; Meuer, C.; Schmidt-Langhorst, C.; Bonk, R.; Arsenijevi, D.; Fiol, G.; Galperin, A.; Leuthold, J.; Li, J.; Schubert, C.


Jaworski, M. ; Institute of Electrical and Electronics Engineers -IEEE-; IEEE Photonics Society:
13th International Conference on Transparent Optical Networks, ICTON 2011. Vol.2 : Stockholm, Sweden, 26 - 30 June 2011
Piscataway/NJ: IEEE, 2011
ISBN: 978-1-4577-0881-7
ISBN: 978-1-4577-0880-0
International Conference on Transparent Optical Networks (ICTON) <13, 2011, Stockholm>
Fraunhofer HHI ()

Filter assisted all-optical wavelength conversion using a quantum dot (QD) based semiconductor optical amplifier (SOA) is presented. Cross-gain modulation and cross-phase modulation were both used to shift the wavelength of 40-Gb/s and 80-Gb/s return-to-zero on-off keying data signals at 1.3 m by 10 nm. The ultra-fast gain recovery of the QD's enables open eyes of the wavelength converted signal with an inverted bit-logic. The slow phase recovery of the carrier reservoir of the QD's, however, leads to phase patterning which becomes evident after filtering of the converted signal with a delay interferometer, whose free spectral range is set to the bit rate. The phase patterning was mitigated by adjusting the delay interferometer to a large free spectral range. Moreover, the delay interferometer reinverted the converted signal and significantly enhanced the extinction ratio. Using such a wavelength converter scheme error-free (bit-error ratio < 10-9) performance was ac hieved for 40 Gb/s, as well as for the first time with QD SOAs at 80 Gb/s.