多項選擇題What are three factors that limit the maximum distance of an amplified optical signal without regeneration? （）(Choose three.)

A. fiber dispersion
B. signal attenuation
C. transmitter power
D. amplifier bandwidth
E. receiver dispersion tolerance


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1.多項選擇題

Click the Exhibit button. When designing a DWDM system with multiple amplified spans, a pre-amp is needed at Site B to （）. (Choose three.)

A. offset the OADM loss at site b 
B. overcome the high multiplexer loss at site a 
C. amplify signal levels after the high loss through Fiber Span 1
D. adjust add channels at site B to be at the same level as the passthrough channels
E. ensure that the per channel power is higher than the minimum needed for the post-amp at Site b

2.單項選擇題How is a Thin Film filter fabricated?（）

A. The glass core is doped with an Erbium in periodic segments of the fiber.
B. Layers of high index ?and low index ?material are deposited on a glass substrate.
C. Thin layers of silica glass are placed onto wafers to produce a prism-like effect.
D. Fiber is etched with an ultraviolet laser that is precisely spaced for specific wavelength filtering.

4.單項選擇題If the power is 0 dBm, what is the power in mW?（）

A.0mW
B.1mW
C.10mW
D.1.5mW

5.單項選擇題Which device creates an OEO conversion?（）

A. amplifier
B. attenuator
C. regenerator
D. light emitter
E. optical switch
F. optical receiver
G. fiber-optic cable

7.多項選擇題What three in combination are factors that can cause four-wave mixing in fiber-optic cables? （）(Choose three.)

A. low optical power
B. high optical power
C. few optical channels
D. many optical channels
E. low chromatic dispersion
F. high chromatic dispersion
G. too much power differential in the optical channels

8.單項選擇題Why are the 1300 nm and 1550 nm regions of the fiber spectrum primarily used for optical communications?（）

A. They are both regions of lowest loss.
B. They are both regions of low reflections.
C. They are both regions of low index of refraction.
D. They are both regions of low chromatic dispersion.
E. They are both regions of low Polarization Mode Dispersion (PMD).

9.單項選擇題What is an advantage of an externally modulated laser over a directly modulated laser?（）

A. lower cost
B. higher chirp
C. easier to manufacture
D. higher dispersion tolerance
E. higher optical signal-to-noise ratio

10.單項選擇題What is the difference between the transmitted power and the sensitivity of the receiver?（）

A. OSNR
B. dispersion
C. attenuation
D. power budget
E. amplifier spacing
F. four wave mixing