WDM
Wavelength-division multiplexing (WDM) is a method of combining multiple signals on laser beams at various infrared (IR) wavelengths for transmission along fiber optic media. Each laser is modulated by an independent set of signals. Wavelength-sensitive filters, the IR analog of visible-light color filters, are used at the receiving end. read more...
To perform the Experiment please follow the procedure:
1. Install the run time engine program to operate each VI.
2. Activate
the
scope, and by pressing
the 
from
the tool bar, and then press the
in
each.
3. Launch and run the NI ELVIs II Oscilloscope VI.
4. Adjust the scope as follows, and take a screen shoot for the input and output.
|
Channel 0 |
Channel 1 |
|
|
Volts/Div |
1 V |
1 V |
|
DC offset |
0 V |
0 V |
|
Time/Div |
100 µ sec | 100 µ sec |
5. Set the Mode control of the green transmitter module to DIGITAL.
6. Run the oscilloscope at Ch (0) and take a screen shoot for the input signal.
7. Describe the signal that you observe.
8. How does the operation of the coupler modules create this distortion?
9. Why isn't the Receiver module able to select just one of the tow light signals and reject the other?
10. What device must be used to allow the Receiver module to convert just one of the light signals back to electrical signal instead of both of them?
12. Observe the signal on the Receiver module's output.