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Journal of Optical Communications and Networking

Journal of Optical Communications and Networking

  • Editors: K. Bergman and O. Gerstel
  • Vol. 5, Iss. 10 — Oct. 1, 2013
  • pp: A119–A126

Demonstration of a 40 Gb/s Wavelength-Reused WDM-PON Using Coding and Equalization [Invited]

Qi Guo and An V. Tran  »View Author Affiliations


Journal of Optical Communications and Networking, Vol. 5, Issue 10, pp. A119-A126 (2013)
http://dx.doi.org/10.1364/JOCN.5.00A119


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Abstract

The wavelength-division-multiplexed passive optical network (WDM-PON) has been generally regarded as a promising solution to the next-generation access network that will be required to deliver services over 40Gb/s. However, fiber dispersion often limits the capacity and reach of WDM-PONs. Compared with dispersion compensation fiber, which is bulky and expensive with significant power loss, digital signal processing is a more suitable way to mitigate chromatic dispersion in PONs. Furthermore, expense is a critical concern in the WDM-PON, due to its need for a large number of lasers and a complex wavelength control mechanism. One practical solution is to reuse the downstream (DS) signal as the carrier for the upstream (US) modulation. In this case, the residual DS signal after remodulation can seriously degrade US transmission. In addition, system performance can be deteriorated by the unwanted reflection as uplinks and downlinks share one wavelength. In this paper, we propose using modified duobinary (MD) coding in the DS to improve its dispersion tolerance and reduce the crosstalk between DS and US induced by remodulation and reflection. MD is a correlative level code that can reduce signal bandwidth and achieve DC balance. We demonstrate a 15 km WDM-PON delivering a 40Gb/s MD-coded signal in the downlink and a 10Gb/s on–off keying signal in the uplink. Compared with no coding, the maximal allowable extinction ratio of the DS signal (ERd) is improved by 4 dB. Moreover, the reflection tolerance of the uplink and downlink is enhanced by 5 and 4 dB, respectively. In addition, investigations on the use of different equalizers in the DS to further suppress fiber dispersion confirm that the superior performance of nonlinear equalization in MD-coded transmission and that the network reach can be extended to 25 km by a nonlinear decision feedback equalizer.

© 2013 Optical Society of America

OCIS Codes
(060.2330) Fiber optics and optical communications : Fiber optics communications
(060.2360) Fiber optics and optical communications : Fiber optics links and subsystems
(060.4250) Fiber optics and optical communications : Networks

ToC Category:
OFC/NFOEC 2013

History
Original Manuscript: May 8, 2013
Revised Manuscript: August 15, 2013
Manuscript Accepted: August 16, 2013
Published: September 18, 2013

Citation
Qi Guo and An V. Tran, "Demonstration of a 40 Gb/s Wavelength-Reused WDM-PON Using Coding and Equalization [Invited]," J. Opt. Commun. Netw. 5, A119-A126 (2013)
http://www.opticsinfobase.org/jocn/abstract.cfm?URI=jocn-5-10-A119

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