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We report on the pilot-tone-based optical channel monitoring technique for use in wavelength-division-multiplexing (WDM) networks. The proposed technique can monitor the wavelengths of WDM signals using phase-modulated pilot tones. Unlike the previously proposed monitoring technique using amplitude-modulated pilot tones, the proposed technique does not suffer from the cross-gain modulation and stimulated Raman scattering. The results show that the proposed technique could not be deteriorated bydoi:10.1109/lpt.2005.857243 fatcat:iiortnjtyjeqvccpgiys65i364