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


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2.單項(xiàng)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

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?()

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).

最新試題

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

題型:?jiǎn)雾?xiàng)選擇題

If the power is 0 dBm, what is the power in mW?()

題型:?jiǎn)雾?xiàng)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:?jiǎn)雾?xiàng)選擇題

What are three factors that limit the maximum distance of an amplified optical signal without regeneration? ()

題型:多項(xiàng)選擇題

In SDH, what is the name of the embedded Data Communication Channel (DCC) in bytes D1-D3?()

題型:?jiǎn)雾?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:?jiǎn)雾?xiàng)選擇題

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

題型:?jiǎn)雾?xiàng)選擇題

Click the Exhibit button. Which type of multiplexer is shown in the exhibit?()

題型:?jiǎn)雾?xiàng)選擇題

Click the Exhibit button. What is the maximum allowable loss budget between the ONS 15216 Mux (left side) composite output and the ONS 15216 Demux (right side) composite input, with the optical values given in the exhibit? (Assume the worst case loss of 4.5 dB for 15216 200 GHz Mux/Demux and ignore power penalties or extra margin.)  ()

題型:?jiǎn)雾?xiàng)選擇題

The ONS 15216 is a 32-channel system. The ONS 15216 OADMs are capable of adding and dropping one, two, or four channels. How are the OADMs provisioned to add and drop specific channels?()

題型:?jiǎn)雾?xiàng)選擇題