Most fiber optic techs are familiar with optical loss test sets, and many use optical time-domain reflectometers, but power meters may not be familiar to all of them. Are you knowledgeable about this instrument?
Created by: Jim Hayes
1. Optical power meters are similar in function to an electrical _______.
2. Optical power is used to measure _______.
A. Transmitter output
B. Receiver input
D. All of the above
3. Optical power can be measured in _______ but is more commonly expressed as _______, which is on a logarithmic scale.
A. Decibels (dB); dB
B. Watts; dB
C. dB; watts
D. Watts; milliwatts (mW)
4. Several optical power meters should measure the same source with a difference of less than 5 percent because they are calibrated to the same standards provided by the U.S. National Institute of Standards and Technology.
5. Fiber optic power meters are typically calibrated at three basic wavelengths of light used in fiber optics, _______, _______ and _______ nanometers.
A. 850; 1,300; 1,550
B. 650; 1,310; 1,550
C. 650; 850; 1,300
D. 850; 1,000; 1,600
6. Actual optical power is measured in _______ while relative power, used for measuring loss, is expressed as _______.
A. dB; decibel-milliwatts (dBm)
B. dB; dBx
C. dBm; dB
D. Watts; dB
7. When measuring power with a meter, it is important to set the wavelength of the light being measured on the meter because _______.
A. The sensitivity of the detector in a power meter varies by wavelength
B. The loss of optical fiber is a function of wavelength
C. Connectors are wavelength dependent
D. It helps you remember and document what you are measuring
8. The “m” in dBm means a fiber optic power meter _______.
A. Measures “mean” or “average” power
B. References the power measured to another meter
C. Is calibrated to read absolute power referenced to “1 mW” or “0 dBm”
D. Indicates the battery power is marginal
9. Which of the optical power measurements below has the highest optical power?
A. +10 dBm
B. 0 dBm
C. -20 dBm
D. -30 dBm
10. Which of the optical power measurements below has the lowest optical power?