If the power is&#819...

单项选择题If the power is 0 dBm， what is the power in mW？（）

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

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1.单项选择题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.单项选择题What is the phenomenon called where different wavelengths of light travel at different speeds？（）

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

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3.单项选择题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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4.单项选择题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

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5.多项选择题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

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6.单项选择题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）.

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7.多项选择题What three in combination are factors that can cause four-wave mixing in fiber-optic cables？（）

A. low optical powe
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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8.单项选择题 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？（）

A. fiber loss
B. OSNR level
C. post amplification
D. index of reflection
E. index of refraction
F. power post amplification budget

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9.单项选择题 Click the Exhibit button.
Which type of multiplexer is shown in the exhibit？（）

A. Thin Film filter
B. Fiber Bragg Grating
C. Arrayed Wave Guide
D. Erbium fiber amplifier

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10.多项选择题What are three factors that limit the maximum distance of an amplified optical signal without regeneration？（）

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

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