| 摘要 |
A re-configurable optical add-drop multiplexer (OADM) (800) includes a first optical circulator (10), a second optical circulator (30) and a fiber Bragg grating (FBG) (20). The first optical circulator has a first circulator port (11), a second circulator port (12) and a third circulator port (13). The second optical circulator has the same structure as the first optical circulator. The FBG has a first state where it reflects an optical signal with a particular wavelength and passes all other wavelengths and a second state where all the optical signals pass through it. Signals of the particular wavelength can thus be dropped from the transmitted signals by reflection of the FBG and output from the third circulator port of the first optical circulator, and new signals of the same dropped wavelength can be added into the transmitted signals though a first circulator port (31) of the second optical circulator.
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