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
Original Manuscript: July 30, 2003
Revised Manuscript: July 30, 2003
Published: September 23, 2003
Sang-Yuep Kim, Jae-Hoon Lee, and Jae-Seung Lee, "Bidirectional ultradense WDM for metro networks adopting the beat-frequency-locking method," J. Opt. Netw. 2, 361-367 (2003)