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مالتی پلکس تفکیک طول موج متراکم
In [24], a 1×N optical switch and a thin film DWDM filter have been introduced to interleave data signals and monitoring signals.
The number of channels is typically among 8 to 80 in commercial devices [3], and the channel spacing is mostly around100GHz in dense-WDM (DWDM).
A dense wavelength division multiplexing (DWDM) multiplexer and a switch are used to select certain monitoring signal and transmit it into the system.
The monitoring signals are generated from the broadband source inside the OTDR, whose spectrum is sliced by the DWDM and then sent to the optical switch.
After passing the DWDM, the OTDR can utilize the reflected signal to locate the fault.
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