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


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2.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

3.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).

4.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

5.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

6.多項選擇題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

10.多項選擇題What are two important considerations when using 2- or 4-channel 15216 OADMs?() (Choose two.)

A. All "Add" channels require uniform power levels.
B. The flexibility of wavelengths per OADM is limited.
C. It is easier to balance "Pass-Through" and "Add" channels.
D. There is lower pass-through loss using multi-channel OADMs.
E. You can extract a single channel without dropping other channels.

最新試題

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:單項選擇題

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

題型:單項選擇題

If node 2 is accepting line timing from node 1, node 2 will send ()to node 1 as its SSM message.

題型:單項選擇題

Why are the 1300 nm and 1550 nm regions of the fiber spectrum primarily used for optical communications?()

題型:單項選擇題

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

題型:多項選擇題

Click the Exhibit button. The exhibit shows a 15454/15216 DWDM system and alarm indications. What are two possible sources of trouble shown in the system?() (Choose two.)

題型:多項選擇題

UPSR protection switching is initiated by (), while BLSR is initiated by ().

題型:單項選擇題

Given the formula: (Fiber Attenuation * Km) + (Splice Attenuation * # of Splices) + (Connector Attenuation * # of Connectors) + (Optical Fiber or OADM) + Buffer(Fiber aging)) With regard to SONET/SDH optical calculations, what will the given formula provide?()

題型:單項選擇題

For lasers with tightly controlled wavelengths, approximately how far apart are the centers of adjacent wavelengths when 100 GHz spacing is used in a DWDM system?()

題型:單項選擇題

What are two important considerations when using 2- or 4-channel 15216 OADMs?() (Choose two.)

題型:多項選擇題