Mitigation of EEPN in Coherent Optical Systems With Low-Speed Digital Coherence Enhancement
2015 (English)In: IEEE Photonics Technology Letters, ISSN 1041-1135, E-ISSN 1941-0174, Vol. 27, no 18, 1942-1945 p.Article in journal (Refereed) Published
A method for mitigating local oscillator (LO) phase noise-induced impairment, also known as equalization-enhanced phase noise, in coherent optical systems is discussed. The method is suitable for real-time implementation and requires hardware with a bandwidth much lower than the signal baud rate, even for a system utilizing conventional semiconductor laser as LO. We evaluate the required parameters like interpolation technique, electrical signal-to-noise ratio at digital coherence enhancement (DCE) front end, for long haul transmission links having quadrature phase shift keying and 16-quadrature amplitude modulation formats. We show that the method can be implemented using a low-speed DCE front end and a simple digital linear interpolator with small (<1 dB) implementation penalty even in cases that would otherwise result in error floor.
Place, publisher, year, edition, pages
2015. Vol. 27, no 18, 1942-1945 p.
Coherent receivers, quadrature amplitude modulation (QAM), equalization-enhanced phase noise, laser linewidth, optical communication
Other Physics Topics
IdentifiersURN: urn:nbn:se:kth:diva-173759DOI: 10.1109/LPT.2015.2447839ISI: 000360375000013ScopusID: 2-s2.0-84940376664OAI: oai:DiVA.org:kth-173759DiVA: diva2:856002
QC 201509232015-09-232015-09-182015-09-23Bibliographically approved