Frequency and Phase Estimation for Coherent QPSK Transmission With Unlocked DFB Lasers

This letter presents a hardware-efficient frequency estimator and an advanced phase estimation algorithm capable of tracking the phase noise of a 10-GBaud optical quadrature phase-shift-keying transmission system with standard distributed-feedback lasers in the presence of a frequency mismatch up to...

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Veröffentlicht in:	IEEE photonics technology letters 2008-09, Vol.20 (18), p.1569-1571
Hauptverfasser:	Hoffmann, S., Bhandare, S., Pfau, T., Adamczyk, O., Wordehoff, C., Peveling, R., Porrmann, M., Noe, R.
Format:	Artikel
Sprache:	eng
Schlagworte:	Algorithms Circuits Coherence Estimators Frequency control Frequency estimation Frequency estimation (FE) Laser noise Lasers optical communication Optical noise Optical receivers Optical variables control Phase estimation phase estimation (PE) Phase noise Phase shift keying Quadrature phase shift keying quadrature phase-shift keying (QPSK) Receivers synchronous detection Tracking
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Beschreibung
Zusammenfassung:	This letter presents a hardware-efficient frequency estimator and an advanced phase estimation algorithm capable of tracking the phase noise of a 10-GBaud optical quadrature phase-shift-keying transmission system with standard distributed-feedback lasers in the presence of a frequency mismatch up to 1.2 GHz. This algorithm allows us to implement a digital coherent receiver without an analog frequency control circuit.
ISSN:	1041-1135 1941-0174
DOI:	10.1109/LPT.2008.928846