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 (ERd) 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 ERd by introducing correlations into the levels of the DS signal to alter its spectrum. 4 dB improved tolerance to ERd 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

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References

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    [CrossRef]
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    [CrossRef]
  4. J. M. Kang and S. K. Han, IEEE Photon. Technol. Lett. 18, 502 (2006).
    [CrossRef]
  5. J. Xu and L. K. Chen, in Optical Fiber Communication Conference, OSA Technical Digest (CD) (Optical Society of America, 2010), paper OThG3.
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    [CrossRef]
  7. Z. Liu, J. Xu, Q. Wang, and C. K. Chan, in Optical Fiber Communication Conference, OSA Technical Digest (CD) (Optical Society of America, 2012) paper OW1B.2.

2011 (1)

Q. Guo, A. V. Tran, and C. J. Chae, IEEE Photon. Technol. Lett. 23, 1442 (2011).
[CrossRef]

2006 (2)

W. Lee, S. H. Cho, M. Y. Park, J. H. Lee, C. Kim, G. Jeong, and B. W. Kim, Electron. Lett. 42, 596 (2006).
[CrossRef]

J. M. Kang and S. K. Han, IEEE Photon. Technol. Lett. 18, 502 (2006).
[CrossRef]

1998 (1)

1975 (1)

P. Kabal and S. Pasupathy, IEEE Trans. Commun. 23, 921 (1975).
[CrossRef]

Chae, C. J.

Q. Guo, A. V. Tran, and C. J. Chae, IEEE Photon. Technol. Lett. 23, 1442 (2011).
[CrossRef]

Chan, C. K.

Z. Liu, J. Xu, Q. Wang, and C. K. Chan, in Optical Fiber Communication Conference, OSA Technical Digest (CD) (Optical Society of America, 2012) paper OW1B.2.

Chen, L. K.

J. Xu and L. K. Chen, in Optical Fiber Communication Conference, OSA Technical Digest (CD) (Optical Society of America, 2010), paper OThG3.

Cho, S. H.

W. Lee, S. H. Cho, M. Y. Park, J. H. Lee, C. Kim, G. Jeong, and B. W. Kim, Electron. Lett. 42, 596 (2006).
[CrossRef]

Feldman, R.

Guo, Q.

Q. Guo, A. V. Tran, and C. J. Chae, IEEE Photon. Technol. Lett. 23, 1442 (2011).
[CrossRef]

Han, S. K.

J. M. Kang and S. K. Han, IEEE Photon. Technol. Lett. 18, 502 (2006).
[CrossRef]

Harstead, E.

Jeong, G.

W. Lee, S. H. Cho, M. Y. Park, J. H. Lee, C. Kim, G. Jeong, and B. W. Kim, Electron. Lett. 42, 596 (2006).
[CrossRef]

Jiang, S.

Kabal, P.

P. Kabal and S. Pasupathy, IEEE Trans. Commun. 23, 921 (1975).
[CrossRef]

Kang, J. M.

J. M. Kang and S. K. Han, IEEE Photon. Technol. Lett. 18, 502 (2006).
[CrossRef]

Kim, B. W.

W. Lee, S. H. Cho, M. Y. Park, J. H. Lee, C. Kim, G. Jeong, and B. W. Kim, Electron. Lett. 42, 596 (2006).
[CrossRef]

Kim, C.

W. Lee, S. H. Cho, M. Y. Park, J. H. Lee, C. Kim, G. Jeong, and B. W. Kim, Electron. Lett. 42, 596 (2006).
[CrossRef]

Lee, J. H.

W. Lee, S. H. Cho, M. Y. Park, J. H. Lee, C. Kim, G. Jeong, and B. W. Kim, Electron. Lett. 42, 596 (2006).
[CrossRef]

Lee, W.

W. Lee, S. H. Cho, M. Y. Park, J. H. Lee, C. Kim, G. Jeong, and B. W. Kim, Electron. Lett. 42, 596 (2006).
[CrossRef]

Liu, Z.

Z. Liu, J. Xu, Q. Wang, and C. K. Chan, in Optical Fiber Communication Conference, OSA Technical Digest (CD) (Optical Society of America, 2012) paper OW1B.2.

Park, M. Y.

W. Lee, S. H. Cho, M. Y. Park, J. H. Lee, C. Kim, G. Jeong, and B. W. Kim, Electron. Lett. 42, 596 (2006).
[CrossRef]

Pasupathy, S.

P. Kabal and S. Pasupathy, IEEE Trans. Commun. 23, 921 (1975).
[CrossRef]

Tran, A. V.

Q. Guo, A. V. Tran, and C. J. Chae, IEEE Photon. Technol. Lett. 23, 1442 (2011).
[CrossRef]

Wang, Q.

Z. Liu, J. Xu, Q. Wang, and C. K. Chan, in Optical Fiber Communication Conference, OSA Technical Digest (CD) (Optical Society of America, 2012) paper OW1B.2.

Wood, T.

Xu, J.

J. Xu and L. K. Chen, in Optical Fiber Communication Conference, OSA Technical Digest (CD) (Optical Society of America, 2010), paper OThG3.

Z. Liu, J. Xu, Q. Wang, and C. K. Chan, in Optical Fiber Communication Conference, OSA Technical Digest (CD) (Optical Society of America, 2012) paper OW1B.2.

Zirngibl, M.

Electron. Lett. (1)

W. Lee, S. H. Cho, M. Y. Park, J. H. Lee, C. Kim, G. Jeong, and B. W. Kim, Electron. Lett. 42, 596 (2006).
[CrossRef]

IEEE Photon. Technol. Lett. (2)

J. M. Kang and S. K. Han, IEEE Photon. Technol. Lett. 18, 502 (2006).
[CrossRef]

Q. Guo, A. V. Tran, and C. J. Chae, IEEE Photon. Technol. Lett. 23, 1442 (2011).
[CrossRef]

IEEE Trans. Commun. (1)

P. Kabal and S. Pasupathy, IEEE Trans. Commun. 23, 921 (1975).
[CrossRef]

J. Lightwave Technol. (1)

Other (2)

J. Xu and L. K. Chen, in Optical Fiber Communication Conference, OSA Technical Digest (CD) (Optical Society of America, 2010), paper OThG3.

Z. Liu, J. Xu, Q. Wang, and C. K. Chan, in Optical Fiber Communication Conference, OSA Technical Digest (CD) (Optical Society of America, 2012) paper OW1B.2.

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Figures (8)

Fig. 1.
Fig. 1.

Proposed WDM optical access system: Tx, transmitter; Rx, receiver; AWG, arrayed waveguide grating.

Fig. 2.
Fig. 2.

(a) Dicode coding diagram and (b) differential precoding of the data before dicode encoding; T, 1 bit period.

Fig. 3.
Fig. 3.

Spectra of DS dicode/NRZ signals and US NRZ signals remodulated on different DS signals.

Fig. 4.
Fig. 4.

Experimental setup.

Fig. 5.
Fig. 5.

BER versus ER d for DS signals in the format of NRZ or dicode and their respective remodulated US signals in the b2b system.

Fig. 6.
Fig. 6.

Eye diagrams of b2b US signals seeded by DS dicode (a) without LPF, (b) with LPF, and seeded by DS NRZ (c) without LPF, (d) with LPF.

Fig. 7.
Fig. 7.

BER versus distance for DS signals in the format of NRZ or dicode and their respective remodulated US signals.

Fig. 8.
Fig. 8.

Eye diagrams of DS signals after 60 km transmission.

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