| 摘要 |
A method for implementing a truly hitless tunable filter for use in adding and/or dropping channels in a wavelength division multiplexed (WDM) network is disclosed. An exemplary method for filtering an optical signal may include providing a composite optical signal having several wavelengths including a first wavelength, a second wavelength and other wavelengths. The method may include passing the first wavelength through a filter (210) and reflecting the second wavelength and other wavelengths with the filter (210). The method may include making the first wavelength available to a drop port (208), and making the second wavelength and the other wavelengths available to an output port (204). ® KIPO & WIPO 2008
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