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Optica Publishing Group
  • Journal of Optical Networking
  • Vol. 2,
  • Issue 10,
  • pp. 361-367
  • (2003)

Bidirectional ultradense WDM for metro networks adopting the beat-frequency-locking method

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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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