Abstract

A simple coded-subcarrier aided scheme is proposed to perform chromatic dispersion monitoring in flexible optical OFDM networks. A pair of coded label subcarriers is added to both edges of the optical OFDM signal spectrum at the edge transmitter node. Upon reception at any intermediate or the receiver node, chromatic dispersion estimation is performed, via simple direct detection, followed by electronic correlation procedures with the designated code sequences. The feasibility and the performance of the proposed scheme have been experimentally characterized. It provides a cost-effective monitoring solution for the optical OFDM signals across intermediate nodes in flexible OFDM networks.

© 2014 Optical Society of America

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References

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  1. M. Jinno, H. Takara, B. Kozicki, Y. Tsukishima, Y. Sone, and S. Matsuoka, “Spectrum-efficient and scalable elastic optical path network: architecture, benefits, and enabling technologies,” IEEE. Commun. Mag. 47(11), 66–73 (2009).
    [CrossRef]
  2. W. Shieh, “OFDM for flexible high-speed optical networks,” J. Lightwave Technol. 29(10), 1560–1577 (2011).
    [CrossRef]
  3. W. Shieh, R. S. Tucker, W. Chen, X. Yi, and G. Pendock, “Optical performance monitoring in coherent optical OFDM systems,” Opt. Express 15(2), 350–356 (2007).
    [CrossRef] [PubMed]
  4. M. Mayrock and H. Haunstein, “Performance monitoring in optical OFDM systems,” in Optical Fiber Communication Conference, San Diego, CA USA (2009), Paper OWM3.
    [CrossRef]
  5. X. R. Cai, D. J. Geisler, R. Proietti, Y. Yin, R. P. Scott, and S. J. B. Yoo, “Spread-spectrum chromatic dispersion monitoring technique for flexible bandwidth channels,” in Conference on Lasers and Electro-Optics, San Jose, CA (2012), Paper CF2I.1.
    [CrossRef]
  6. S. Shimizu, G. Cincotti, and N. Wada, “Chromatic dispersion monitoring and adaptive compensation in an 8 x 12.5 Gb/s all-optical OFDM system,” in European Conference on Optical Communications, London, UK (2013), Paper P.3.2.
  7. C. K. Chan, “Chromatic dispersion monitoring of optical OFDM signals in flexible optical networks,” in Proc. Asia Communications and Photonics Conference & International Conference on Information Photonics and Optical Communications (ACP/IPOC), Beijing, PRC (2013), Paper AF1H.2.
    [CrossRef]
  8. W. Shieh, H. Bao, and Y. Tang, “Coherent optical OFDM: theory and design,” Opt. Express 16(2), 841–859 (2008).
    [CrossRef] [PubMed]
  9. J. Armstrong, “OFDM for optical communications,” J. Lightwave Technol. 27(3), 189–204 (2009).
    [CrossRef]

2011 (1)

2009 (2)

M. Jinno, H. Takara, B. Kozicki, Y. Tsukishima, Y. Sone, and S. Matsuoka, “Spectrum-efficient and scalable elastic optical path network: architecture, benefits, and enabling technologies,” IEEE. Commun. Mag. 47(11), 66–73 (2009).
[CrossRef]

J. Armstrong, “OFDM for optical communications,” J. Lightwave Technol. 27(3), 189–204 (2009).
[CrossRef]

2008 (1)

2007 (1)

Armstrong, J.

Bao, H.

Chen, W.

Jinno, M.

M. Jinno, H. Takara, B. Kozicki, Y. Tsukishima, Y. Sone, and S. Matsuoka, “Spectrum-efficient and scalable elastic optical path network: architecture, benefits, and enabling technologies,” IEEE. Commun. Mag. 47(11), 66–73 (2009).
[CrossRef]

Kozicki, B.

M. Jinno, H. Takara, B. Kozicki, Y. Tsukishima, Y. Sone, and S. Matsuoka, “Spectrum-efficient and scalable elastic optical path network: architecture, benefits, and enabling technologies,” IEEE. Commun. Mag. 47(11), 66–73 (2009).
[CrossRef]

Matsuoka, S.

M. Jinno, H. Takara, B. Kozicki, Y. Tsukishima, Y. Sone, and S. Matsuoka, “Spectrum-efficient and scalable elastic optical path network: architecture, benefits, and enabling technologies,” IEEE. Commun. Mag. 47(11), 66–73 (2009).
[CrossRef]

Pendock, G.

Shieh, W.

Sone, Y.

M. Jinno, H. Takara, B. Kozicki, Y. Tsukishima, Y. Sone, and S. Matsuoka, “Spectrum-efficient and scalable elastic optical path network: architecture, benefits, and enabling technologies,” IEEE. Commun. Mag. 47(11), 66–73 (2009).
[CrossRef]

Takara, H.

M. Jinno, H. Takara, B. Kozicki, Y. Tsukishima, Y. Sone, and S. Matsuoka, “Spectrum-efficient and scalable elastic optical path network: architecture, benefits, and enabling technologies,” IEEE. Commun. Mag. 47(11), 66–73 (2009).
[CrossRef]

Tang, Y.

Tsukishima, Y.

M. Jinno, H. Takara, B. Kozicki, Y. Tsukishima, Y. Sone, and S. Matsuoka, “Spectrum-efficient and scalable elastic optical path network: architecture, benefits, and enabling technologies,” IEEE. Commun. Mag. 47(11), 66–73 (2009).
[CrossRef]

Tucker, R. S.

Yi, X.

IEEE. Commun. Mag. (1)

M. Jinno, H. Takara, B. Kozicki, Y. Tsukishima, Y. Sone, and S. Matsuoka, “Spectrum-efficient and scalable elastic optical path network: architecture, benefits, and enabling technologies,” IEEE. Commun. Mag. 47(11), 66–73 (2009).
[CrossRef]

J. Lightwave Technol. (2)

Opt. Express (2)

Other (4)

M. Mayrock and H. Haunstein, “Performance monitoring in optical OFDM systems,” in Optical Fiber Communication Conference, San Diego, CA USA (2009), Paper OWM3.
[CrossRef]

X. R. Cai, D. J. Geisler, R. Proietti, Y. Yin, R. P. Scott, and S. J. B. Yoo, “Spread-spectrum chromatic dispersion monitoring technique for flexible bandwidth channels,” in Conference on Lasers and Electro-Optics, San Jose, CA (2012), Paper CF2I.1.
[CrossRef]

S. Shimizu, G. Cincotti, and N. Wada, “Chromatic dispersion monitoring and adaptive compensation in an 8 x 12.5 Gb/s all-optical OFDM system,” in European Conference on Optical Communications, London, UK (2013), Paper P.3.2.

C. K. Chan, “Chromatic dispersion monitoring of optical OFDM signals in flexible optical networks,” in Proc. Asia Communications and Photonics Conference & International Conference on Information Photonics and Optical Communications (ACP/IPOC), Beijing, PRC (2013), Paper AF1H.2.
[CrossRef]

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Figures (7)

Fig. 1
Fig. 1

The block diagram of the proposed CO-OFDM transmitter. The output spectrum of the generated optical OFDM signal, two inserted optical coded label subcarriers, c1 and c2 (in red), is also shown. (I&Q: inphase and quadrature phase components, IFFT: inverse fast Fourier transform, m-QAM: multilevel quadrature amplitude modulation, CP: cyclic prefix, D/A digital-to-analog, LD: laser diode)

Fig. 2
Fig. 2

A CDMA label code generation and expansion example with k = 7, p = 4 and m = 4. Ts is the bit period of the optical OFDM payload.

Fig. 3
Fig. 3

The structure of the monitoring unit. (PD: photo-detector, LPF: electrical low pass filter).

Fig. 4
Fig. 4

Experimental Setup (OBPF: optical band pass filter, AOM: acoustic optical modulator, PD: Photo detector, PC: polarization controller). Inset shows the electrical spectra of the generated OFDM signal.

Fig. 5
Fig. 5

Measured correlation results with (a) matched code sequence, (b) unmatched code sequence, and (c) temporal differences between the correlation peaks of the two coded labels, after 800-km and 1600-km transmissions.

Fig. 6
Fig. 6

Accumulated chromatic dispersion of the optical OFDM signal, (a) with different lengths of SSMF fiber transmission (with error bars), (b) with different number of re-circulating loop containing DCF inside each loop.

Fig. 7
Fig. 7

(a) Measured correlation peaks ratios of the two coded label subcarriers at different values of OSNR. (b) Measured BER performance of the optical OFDM signal measured under different OSNR values, with and without the insertion of the two coded label subcarriers, for back to back and after 200-km transmission. Insets show the signal constellation diagrams.

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