Fiber Optic Test Sources
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.
1. A test source for fiber optic cables uses a(n) _______ or a(n) _______ to create light to couple into the fiber. (Choose two.)
Correct Answer: LED
Correct Answer: Laser
2. The light source must be similar to the _______ to be compatible with the fiber being tested.
Correct Answer: Network transmitter
3. The source reference power for “0 dB” when making loss measurements is set at _______.
Correct Answer: The output of the reference test cable used for testing loss
4. Since the fiber attenuation varies with _______, a source of similar _______ must be used for testing. (Choose two.)
Correct Answer: Wavelength
5. Multimode fiber is tested with a(n) _______ source at _______.
Correct Answer: LED, 850 or 1,300 nanometer (nm) wavelength
6. The _______ of a multimode test source can cause big variations in the loss measured.
Correct Answer: Modal distribution
7. Sources for multimode testing should use a mandrel wrap on the launch cable to _______.
Correct Answer: Condition the modal distribution of the launch
8. The mandrel wrap used in multimode testing to create standard test conditions will in addition reduce the loss measured significantly.
Correct Answer: True
9. Single-mode fiber testing requires a(n) _______ source at _______ wavelength.
Correct Answer: Laser, 1,310 nm and/or 1,550 nm
10. To allow accurate tests, the source must ________.
Correct Answer: All of the above
Score: