Optimal Least-Squares FIR Digital Filters for Compensation of Chromatic Dispersion in Digital Coherent Optical Receivers
2014 (English)In: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 32, no 8, 1449-1456 p.Article in journal (Refereed) Published
This paper proposes optimal finite-length impulse response (FIR) digital filters, in the least-squares (LS) sense, for compensation of chromatic dispersion (CD) in digital coherent optical receivers. The proposed filters are based on the convex minimization of the energy of the complex error between the frequency responses of the actual CD compensation filter and the ideal CD compensation filter. The paper utilizes the fact that pulse shaping filters limit the effective bandwidth of the signal. Then, the filter design for CD compensation needs to be performed over a smaller frequency range, as compared to the whole frequency band in the existing CD compensation methods. By means of design examples, we show that our proposed optimal LS FIR CD compensation filters outperform the existing filters in terms of performance, implementation complexity, and delay.
Place, publisher, year, edition, pages
Optical Society of America , 2014. Vol. 32, no 8, 1449-1456 p.
Chromatic dispersion (CD); digital filter; fiber optics; optimal least-squares (LS) FIR filter
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-106013DOI: 10.1109/JLT.2014.2307916ISI: 000332966300004OAI: oai:DiVA.org:liu-106013DiVA: diva2:712955