Abstract
The detrimental effects caused by a link control (LC) channel have been investigated when most channels are dropped in the LC-based wavelength division multiplexing (WDM) optical network with 16 signal channels. The use of the LC control channel with longer wavelength than the signal-channel band mitigates the gain degradation of surviving channel caused by spectral hole burning in the erbium-doped fiber amplifier (EDFA) and avoids the gain amplification caused by stimulated Raman scattering in the optical fiber. Spectral broadening of the LC channel increases its threshold power of stimulated Brilluoin scattering in the optical fiber. By using a frequency-dithered LC channel with longer wavelength than the signal channels in the SMF 240 km, 16×10 Gbit/s WDM optical network, no degradation is observed in the received optical power whatever the channel count and the surviving channel power excursion is less than 1 dB up to 10 dropped channels.
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