| 摘要 |
<p>A filterÄ10, 50, 100Ü for generating an output light signal having one or more output spectral lines selected from a plurality of potential spectral lines contained in an input light signal. The filterÄ10, 50, 100Ü includes a channel filterÄ103, 20, 70Ü for filtering the input light signal to create a notched light signal having a spectrum devoid of light at a first wavelength. The filterÄ10, 50, 100Ü also includes a variable wavelength reflectorÄ105, 30, 80Ü for reflecting light having a wavelength equal to a reflection wavelength, the reflection wavelength being selectable from the first wavelength and a second wavelength equal to the wavelength of one of the spectral lines. The output of the channel filterÄ103, 20, 70Ü is coupled to the input of the variable wavelength reflectorÄ105, 30, 80Ü. The output of the variable wavelength reflectorÄ105, 30, 80Ü includes the output light signal. The channel filterÄ103, 20, 70Ü can be constructed using a number of known optical components such as fiber Bragg reflectorsÄ21-23Ü, array waveguide filtersÄ70Ü, Mach Zehnder filters, or absorption filters. The variable wavelength reflectorÄ105, 30, 80Ü is preferably constructed from one or more variable frequency fiber Bragg reflectorsÄ31 -33Ü. <IMAGE></p> |
