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Optics Letters

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  • Editor: Alan E. Willner
  • Vol. 37, Iss. 19 — Oct. 1, 2012
  • pp: 4137–4139

Level coding technique for a wavelength-division-multiplexed optical access system using a remodulation scheme

Qi Guo and An V. Tran  »View Author Affiliations


Optics Letters, Vol. 37, Issue 19, pp. 4137-4139 (2012)
http://dx.doi.org/10.1364/OL.37.004137


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Abstract

In the wavelength-division-multiplexed optical access network, the system architecture based on remodulating the downstream (DS) signal for upstream transmission resolves the issues of wavelength management and hardware cost . However, this amplitude remodulation scheme introduces intensity noise in the uplink and leads to a system performance penalty. Therefore, the DS extinction ratio ( ER d ) has to be optimized in order to balance the performance of up- and down- links. In this Letter, a novel technique is presented to overcome the restrictions on ER d by introducing correlations into the levels of the DS signal to alter its spectrum. 4 dB improved tolerance to ER d is achieved in the proposed system. The level-correlation coding technique is also able to mitigate the in-band crosstalk induced by Rayleigh backscattering. It is demonstrated that the system reach is extended by 40 km with the proposed approach.

© 2012 Optical Society of America

OCIS Codes
(060.2330) Fiber optics and optical communications : Fiber optics communications
(060.4080) Fiber optics and optical communications : Modulation
(060.4230) Fiber optics and optical communications : Multiplexing

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: June 28, 2012
Revised Manuscript: August 7, 2012
Manuscript Accepted: August 18, 2012
Published: September 28, 2012

Citation
Qi Guo and An V. Tran, "Level coding technique for a wavelength-division-multiplexed optical access system using a remodulation scheme," Opt. Lett. 37, 4137-4139 (2012)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-37-19-4137


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References

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