G C O G C O G C O G C O UPC UPC UPC UPC - - - - GCO GCO GCO GCO Universitat Politècnica de Catalunya (UPC) Dept. of Signal Theory and Communications (TSC) Optical Communications Group (GCO) www.tsc.upc.edu/gco Universitat Politècnica de Catalunya Low Cost Homodyne Transceiver Low Cost Homodyne Transceiver for Ultra for Ultra - - Dense WDM Access Dense WDM Access Networks Networks Josep M Josep M Josep M Josep Mª ª ªF F Fà à àbrega brega brega brega and Josep Prat and Josep Prat and Josep Prat and Josep Prat [email protected]
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Low Cost Transceiver For Ultra Dense WDM Access Networks
These are the slides presented during the talk with same title, at NOC 2009 conference. There we proposed and demonstrated a DPSK homodyne receiver architecture based on a simple phase-diversity set-up with analog processing. Due to its spectral properties, it remarkably increases the phase noise tolerance of more conventional homodyne receivers. Also it can achieve high sensitivity and is integrable.
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Universitat Politècnica de Catalunya (UPC)Dept. of Signal Theory and Communications (TSC)
Optical Communications Group (GCO)www.tsc.upc.edu/gco
[2] J. Prat and J. M. Fabrega, ECOC 2005, Glasgow, Scotland, sept. 2005, paper We.P.104
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Time Time Time Time SwitchingSwitchingSwitchingSwitching PhasePhasePhasePhase DiversityDiversityDiversityDiversity ReceiverReceiverReceiverReceiver
� Diversity achieved by switching local laser phase [1]
� Achieved high tolerance to laser linewidth with simple architecture [2] and narrow channel spacing [3]
� 3 dB penalty with respect to an ideal homodynesystem due to the phase switching
� Similar structure has been integrated on a chip [4]
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t0 t0+T/2 t0+Tt
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t0+3T/2 t0+2T
[2] J. Prat and J. M. Fabrega, ECOC 2005, Glasgow, Scotland, sept. 2005, paper We.P.104 [3] J. M. Fabrega and J. Prat, OSA Optics Letters, vol. 32, no. 5, March 2007[4] J. M. Fabrega and J. Prat, OSA Optics Letters, vol. 34, no. 4, February 2009[5] J. Klamkin, et al., in Proceedings LEOS 2007, pp. 40-41