Abstract

We present a technique to increase the spectral efficiencies of metro networks by using channel-interleaved bidirectional ultradense wavelength-division multiplexing (WDM) within each customer’s optical band. As a demonstration, we transmit 12.5-GHz-spaced 8×10 Gbit/s channels achieving spectral efficiency as high as 0.8 bit/s/Hz with a 25-GHz WDM demultiplexer. The beat-frequency-locking method is used to stabilize the channel frequencies within ±200 MHz, which is far more accurate than with conventional wavelength lockers.

© 2003 Optical Society of America

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  1. H. Suzuki, M. Fujiwara, N. Takachio, K. Iwatsuki, T. Kitoh, and T. Shibata, "12.5-GHz spaced 1.28-Tb/s (512-channel × 2.5 Gb/s) super-dense WDM transmission over 320-km SMF using multiwavelength generation technique," IEEE Photon. Technol. Lett. 14, 405-407 (2002).
  2. G. Vareille, O. Ait Sab, F. Pitel, and J. F. Marcerou, "Terabit transoceanic system assessment with industrial margins using 25 GHz channel spacing and NRZ format," in Optical Fiber Communication Conference (OFC2002), Vol. 70 of OSA Trends in Optics and Photonics Series (Optical Society of America, Washington, D.C., 2002), pp. 295-296.
  3. Y. Yamada, S. I. Nakagawa, Y. Kurosawa, T. Kawazawa, H. Taga, and K. Goto, "2 Tbit/s (200 × 10 Gbit/s) over 9240 km transmission experiment with 0.15 nm channel spacing using VSB format," IEE Electron. Lett. 38, 328-330 (2002).
  4. S. Radic, S. Chandrasekhar, A. Srivastava, H. Kim, L. Nelson, S. Liang, K. Tai, and N. Copner, "Dense interleaved bidirectional transmission over 5 × 80 km of nonzero dispersion-shifted fiber," IEEE Photon. Technol. Lett. 14, 218-220 (2002).
  5. Y. S. Ahn, S. Y. Kim, S. H. Han, J. S. Lee, S. S. Lee, and W. S. Seo, "Bidirectional DWDM transmission using a beat-frequency-locking method," IEEE Photon. Technol. Lett. 13, 899-901 (2001).
  6. E. J. Bachus, R. P. Braun, W. Eutin, E. Grossmann, H. Foisel, K. Heimes, and B. Strebel, "Coherent optical-fibre subscriber line," IEE Electron. Lett. 21, 1203-1205 (1985).
  7. F. Forghieri, R. W. Tkach, and A. R. Chraplyvy, "Fiber nonlinearities and their impact on transmission systems," in Optical Fiber Telecommunications IIIA, I. P. Kaminow and T. L. Koch, eds. (Academic, San Diego, Calif., 1997), pp. 199-203.
  8. C. X. Yu, S. Chandrasekhar, T. Zhou, and D. T. Neilson, "0.8 bit/s/Hz spectral efficiency at 10 Gbit/s via vestigial-sideband filtering," IEE Electron. Lett. 39, 225-227 (2003).
  9. T. Ono and Y. Yano, "Key technologies for terabit/second WDM systems with high spectral efficiency of over 1 bit/s/Hz," IEEE J. Quantum Electron. 34, 2080-2088 (1998).

IEE Electron. Lett. (3)

Y. Yamada, S. I. Nakagawa, Y. Kurosawa, T. Kawazawa, H. Taga, and K. Goto, "2 Tbit/s (200 × 10 Gbit/s) over 9240 km transmission experiment with 0.15 nm channel spacing using VSB format," IEE Electron. Lett. 38, 328-330 (2002).

E. J. Bachus, R. P. Braun, W. Eutin, E. Grossmann, H. Foisel, K. Heimes, and B. Strebel, "Coherent optical-fibre subscriber line," IEE Electron. Lett. 21, 1203-1205 (1985).

C. X. Yu, S. Chandrasekhar, T. Zhou, and D. T. Neilson, "0.8 bit/s/Hz spectral efficiency at 10 Gbit/s via vestigial-sideband filtering," IEE Electron. Lett. 39, 225-227 (2003).

IEEE J. Quantum Electron. (1)

T. Ono and Y. Yano, "Key technologies for terabit/second WDM systems with high spectral efficiency of over 1 bit/s/Hz," IEEE J. Quantum Electron. 34, 2080-2088 (1998).

IEEE Photon. Technol. Lett (1)

H. Suzuki, M. Fujiwara, N. Takachio, K. Iwatsuki, T. Kitoh, and T. Shibata, "12.5-GHz spaced 1.28-Tb/s (512-channel × 2.5 Gb/s) super-dense WDM transmission over 320-km SMF using multiwavelength generation technique," IEEE Photon. Technol. Lett. 14, 405-407 (2002).

IEEE Photon. Technol. Lett. (1)

Y. S. Ahn, S. Y. Kim, S. H. Han, J. S. Lee, S. S. Lee, and W. S. Seo, "Bidirectional DWDM transmission using a beat-frequency-locking method," IEEE Photon. Technol. Lett. 13, 899-901 (2001).

Photon. Technol. Lett. (1)

S. Radic, S. Chandrasekhar, A. Srivastava, H. Kim, L. Nelson, S. Liang, K. Tai, and N. Copner, "Dense interleaved bidirectional transmission over 5 × 80 km of nonzero dispersion-shifted fiber," IEEE Photon. Technol. Lett. 14, 218-220 (2002).

Other (2)

G. Vareille, O. Ait Sab, F. Pitel, and J. F. Marcerou, "Terabit transoceanic system assessment with industrial margins using 25 GHz channel spacing and NRZ format," in Optical Fiber Communication Conference (OFC2002), Vol. 70 of OSA Trends in Optics and Photonics Series (Optical Society of America, Washington, D.C., 2002), pp. 295-296.

F. Forghieri, R. W. Tkach, and A. R. Chraplyvy, "Fiber nonlinearities and their impact on transmission systems," in Optical Fiber Telecommunications IIIA, I. P. Kaminow and T. L. Koch, eds. (Academic, San Diego, Calif., 1997), pp. 199-203.

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