多項(xiàng)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


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1.單項(xiàng)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).

2.單項(xiàng)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

3.單項(xiàng)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

4.多項(xiàng)選擇題Which three technologies are used to reduce chromatic dispersion accumulation in fiber-optic transmission systems? ()(Choose three.)

A. PIN photodiodes
B. zero-chirped lasers
C. Erbium-doped fiber amplifiers
D. dispersion compensating fiber
E. dispersion compensating Bragg grating

5.單項(xiàng)選擇題What is the phenomenon called where different wavelengths of light travel at different speeds?()

A.OSNR
B.dispersion
C.light skew
D.attenuation

最新試題

The dispersion of a non-zero dispersion shifted fiber is 6 ps/nm*km at 1550 nm and 10 ps/nm*km at 1610 nm. What is the minimum dispersion compensation required if an L-Band DWDM signal travels through 200 km of fiber and has a dispersion tolerance of 1800 ps/nm?()

題型:單項(xiàng)選擇題

What is the phenomenon called where different wavelengths of light travel at different speeds?()

題型:單項(xiàng)選擇題

What is the difference between the transmitted power and the sensitivity of the receiver?()

題型:單項(xiàng)選擇題

In order to avoid misconnections due to a failed node in a Bidirectional Line Switched Ring (BLSR), Alarm Indication Signals (AISs) are sent on every channel normally terminating in that node. What is the name of this process?()

題型:單項(xiàng)選擇題

What are three relevant design considerations when using the 15216 EDFA? ()(Choose three.)

題型:多項(xiàng)選擇題

Which three technologies are used to reduce chromatic dispersion accumulation in fiber-optic transmission systems? ()(Choose three.)

題型:多項(xiàng)選擇題

SONET Code Violations (CVs) totals in the PM tables are actually an accumulation of the number of ().

題型:單項(xiàng)選擇題

A 2.5 Gb/s (OC-48 or STM-16) optical signal with a dispersion tolerance of 1200 ps/nm goes through fiber with 18ps/nm*km of dispersion. How many 15216-DCU-350 equivalents are needed for enough compensation after traveling 100 km?()

題型:單項(xiàng)選擇題

In the OSNR model for EDFA amplifiers, SNR OUT = 1/(1/SNR IN + FhvB/P IN ), what does SNR IN represent?()

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SONET Path Terminating Equipment (PTE) requires which three line codes to be supported for DS1 and DS3 circuits?() (Choose three.)

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