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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 25 — Dec. 6, 2010
  • pp: 26046–26051

40-Gb/s downstream DPSK and 40-Gb/s upstream OOK signal remodulation PON using reduced modulation index

C. W. Chow and C. H. Yeh  »View Author Affiliations


Optics Express, Vol. 18, Issue 25, pp. 26046-26051 (2010)
http://dx.doi.org/10.1364/OE.18.026046


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Abstract

As different high speed signal-remodulation wavelength division multiplexed – passive optical network (WDM-PON) solutions up to 10 Gb/s have been proposed, researchers are going to further increase the data rate of PON towards 40 Gb/s or higher. However, scaling up from 10 Gb/s/wavelength to 40 Gb/s/wavelength PON is very challenging. Although many studies have been performed on upgrading the exiting 10 Gb/s network to 40 Gb/s, the study of the 40 Gb/s signal-remodulation network is very little. In this work, we will first study the chromatic dispersion effect on the signal-remodulation PON. Then, we will propose and demonstrate a signal-remodulation PON using 40-Gb/s downstream differential-phase shift keying (DPSK) and 40-Gb/s upstream on-off keying (OOK) signals. By using the reduced modulation index (RMI) of the downstream DPSK signal, the tolerance to the residual chromatic dispersion of the whole system can be greatly enhanced. Due to the reduced impact of the accumulated chromatic dispersion, the quality of the upstream remodulated OOK signal can be significantly improved. Besides, by detecting the downstream demodulated DPSK signal at the destructive output port of the demodulator, good quality of the demodulated DPSK signal can still be achieved.

© 2010 OSA

OCIS Codes
(060.2330) Fiber optics and optical communications : Fiber optics communications
(060.4510) Fiber optics and optical communications : Optical communications

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: September 15, 2010
Revised Manuscript: October 25, 2010
Manuscript Accepted: November 5, 2010
Published: November 30, 2010

Citation
C. W. Chow and C. H. Yeh, "40-Gb/s downstream DPSK and 40-Gb/s upstream OOK signal remodulation PON using reduced modulation index," Opt. Express 18, 26046-26051 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-25-26046


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References

  1. G. Talli, C. W. Chow, E. K. MacHale, and P. D. Townsend, “Long reach hybrid DWDM-TDM PON with high split ratio employing centralized light source,” J. Opt. Netw. 6, 765–776 (2007). [CrossRef]
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  6. C. W. Chow, L. Xu, C. H. Yeh, H. K. Tsang, W. Hofmann, and M. C. Amann, “40 Gb/s upstream transmitters using directly-modulated 1.55 μm VCSEL array for high-split-ratio PONs,” IEEE Photon. Technol. Lett. 22(5), 347–349 (2010). [CrossRef]
  7. S.-G. Mun, J.-H. Moon, H.-K. Lee, J.-Y. Kim, and C.-H. Lee, “A WDM-PON with a 40 Gb/s (32 x 1.25 Gb/s) capacity based on wavelength-locked Fabry-Perot laser diodes,” Opt. Express 16(15), 11361–11368 (2008). [CrossRef] [PubMed]
  8. L. E. Nelson, “Challenges of 40 Gb/s WDM transmission,” Proc. OFC, ThF1–1-ThF1–3 (2001).

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