| 摘要 |
An add/drop multiplexer includes first and second fiber grating connected to a four-port optical circulator having first and second input/output ports, an add port, and a drop port, wherein the first fiber grating is connected to the first input/output port and the second fiber grating is connected to the second input/output port. Add signals provided to the add port of the circulator are reflected by the first fiber grating back to the optical circulator and propagate, along with one or more input optical signals, to the second fiber grating. One or more of the input optical signals are reflected by the second fiber grating back to the optical circulator and propagate to the drop port of the circulator.
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