My previous quiz focused on power meters and how they are used to make basic measurements. To measure loss, you need a test source in addition to a power meter. Are you familiar with the sources used for fiber optic testing? More information on optical power can be found in the Fiber Optics Association Guide at www.thefoa.org/tech/ref/testing/test/power.html.
Created by: Jim Hayes
1. A test source for fiber optic cables uses a(n) _______ or a(n) _______ to create light to couple into the fiber. (Choose two.)
D. Laser pointer
2. The light source must be similar to the _______ to be compatible with the fiber being tested.
A. Network transmitter
B. Network receiver
C. Power meter
D. Optical loss test set
3. The source reference power for “0 dB” when making loss measurements is set at _______.
A. The dial or button on the instrument’s front panel
B. The output of the reference test cable used for testing loss
C. The value on the instrument display
D. 1 milliwatt
4. Since the fiber attenuation varies with _______, a source of similar _______ must be used for testing. (Choose two.)
A. Power level
5. Multimode fiber is tested with a(n) _______ source at _______.
A. LED, 850 or 1,300 nanometer (nm) wavelength
B. LED, 0 dBm power level
C. Laser, variable wavelength
D. VCSEL, 950-nm wavelength
6. The _______ of a multimode test source can cause big variations in the loss measured.
B. Modal distribution
D. All of the above
7. Sources for multimode testing should use a mandrel wrap on the launch cable to _______.
A. Adjust the reference power to 0 dB
B. Condition the modal distribution of the launch
C. Stabilize the source
D. Make the LED more like a laser
8. The mandrel wrap used in multimode testing to create standard test conditions will in addition reduce the loss measured significantly.
9. Single-mode fiber testing requires a(n) _______ source at _______ wavelength.
A. Laser, 1,310 nm and/or 1,550 nm
B. Laser, 850 nm
C. LED, 1,550 nm
D. DFB laser, 1,490 to 1,625 nm
10. To allow accurate tests, the source must ________.
A. Have a stable output over time
B. Be at the proper wavelength
C. Be coupled to a high-quality launch reference cable