多项选择题
A. PIN photodiodes B. zero-chirped lasers C. Erbium-doped fiber amplifiers D. dispersion compensating fiber E. dispersion compensating Bragg grating
Whyarethe1300nmand1550nmregionsofthefiberspectrumprimar...
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）.
Whatthreeincombinationarefactorsthatcancausefour-wavemi...
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
Given the formula： （Fiber Attenuation * Km） + （Splice A...
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
