A wavelength identification and analysis sensor comprising: a wavelength transmitter, operably connectable to an input of a plurality of inputs or an output of a plurality of outputs of a wavelength selective device of a wavelength division multiplex network, configured to transmit, based on a predefined order, test signals on a plurality of wavelengths into the input or output of the wavelength selective device of the WDM network; and a wavelength analyzer configured to: detect returned signals from the input or output of the wavelength selective device of the WDM network, each returned signal associated with one of the transmitted test signals; and characterized in that the wavelength analyzer is configured to: analyze the returned signals to detect wavelength mismatches between the plurality of wavelengths and wavelengths of corresponding return signals of the returned signals and identify, based on the analysis of the returned signals, a wavelength associated with the input or output of the wavelength selective device of the WDM network by: identifying a wavelength of the plurality of wavelengths for which an amplitude corresponding to a wavelength mismatch of the wavelength mismatches is less than a specified amplitude threshold; and designating the wavelength of the plurality of wavelengths for which the amplitude corresponding to the wavelength mismatch of the wavelength mismatches is less than the specified amplitude threshold as the wavelength associated with the input or output of the wavelength selective device of the WDM network. a wavelength transmitter, operably connectable to an input of a plurality of inputs or an output of a plurality of outputs of a wavelength selective device of a wavelength division multiplex network, configured to transmit, based on a predefined order, test signals on a plurality of wavelengths into the input or output of the wavelength selective device of the WDM network; and a wavelength analyzer configured to: detect returned signals from the input or output of the wavelength selective device of the WDM network, each returned signal associated with one of the transmitted test signals; and characterized in that the wavelength analyzer is configured to: analyze the returned signals to detect wavelength mismatches between the plurality of wavelengths and wavelengths of corresponding return signals of the returned signals and identify, based on the analysis of the returned signals, a wavelength associated with the input or output of the wavelength selective device of the WDM network by: identifying a wavelength of the plurality of wavelengths for which an amplitude corresponding to a wavelength mismatch of the wavelength mismatches is less than a specified amplitude threshold; and designating the wavelength of the plurality of wavelengths for which the amplitude corresponding to the wavelength mismatch of the wavelength mismatches is less than the specified amplitude threshold as the wavelength associated with the input or output of the wavelength selective device of the WDM network. detect returned signals from the input or output of the wavelength selective device of the WDM network, each returned signal associated with one of the transmitted test signals; and characterized in that the wavelength analyzer is configured to: analyze the returned signals to detect wavelength mismatches between the plurality of wavelengths and wavelengths of corresponding return signals of the returned signals and identify, based on the analysis of the returned signals, a wavelength associated with the input or output of the wavelength selective device of the WDM network by: identifying a wavelength of the plurality of wavelengths for which an amplitude corresponding to a wavelength mismatch of the wavelength mismatches is less than a specified amplitude threshold; and designating the wavelength of the plurality of wavelengths for which the amplitude corresponding to the wavelength mismatch of the wavelength mismatches is less than the specified amplitude threshold as the wavelength associated with the input or output of the wavelength selective device of the WDM network. identifying a wavelength of the plurality of wavelengths for which an amplitude corresponding to a wavelength mismatch of the wavelength mismatches is less than a specified amplitude threshold; and designating the wavelength of the plurality of wavelengths for which the amplitude corresponding to the wavelength mismatch of the wavelength mismatches is less than the specified amplitude threshold as the wavelength associated with the input or output of the wavelength selective device of the WDM network.