Phase noise influence in long-range coherent optical OFDM systems with delay detection, IFFT multiplexing and FFT demodulation
2012 (English)In: Journal of optical communications, ISSN 0173-4911, Vol. 33, no 4, 289-295 p.Article in journal (Refereed) Published
We present a study of the influence of dispersion induced phase noise for CO-OFDM systems using FFT multiplexing/IFFT demultiplexing techniques (software based). The software based system provides a method for a rigorous evaluation of the phase noise variance caused by Common Phase Error (CPE) and Inter-Carrier Interference (ICI) including - for the first time to our knowledge - in explicit form the effect of equalization enhanced phase noise (EEPN). This, in turns, leads to an analytic BER specification. Numerical results focus on a CO-OFDM system with 10-25 GS/s QPSK channel modulation. A worst case constellation configuration is identified for the phase noise influence and the resulting BER is compared to the BER of a conventional single channel QPSK system with the same capacity as the CO-OFDM implementation. Results are evaluated as a function of transmission distance. For both types of systems, the phase noise variance increases significantly with increasing transmission distance. For a total capacity of 400 (1000) Gbit/s, the transmission distance to have the BER < 10-2 for the worst case CO-OFDM design is less than 800 and 460 km, respectively, whereas for a single channel QPSK system it is less than 1400 and 560 km.
Place, publisher, year, edition, pages
2012. Vol. 33, no 4, 289-295 p.
Coherent systems, Orthogonal frequency division multiplexed systems, Phase noise, RF pilot carrier
IdentifiersURN: urn:nbn:se:kth:diva-117754DOI: 10.1515/joc-2012-0047ScopusID: 2-s2.0-84872702059OAI: oai:DiVA.org:kth-117754DiVA: diva2:602959
QC 201302042013-02-042013-02-042013-02-04Bibliographically approved