Optical Communication - Study Mode
[#116] The optical source used in a fiber is an injection laser with a relative spectral width $$frac{{{sigma _lambda }}}{lambda }$$ of 0.0011 at a wavelength of 0.70μm. Estimate the RMS spectral width.
Correct Answer
(C) 0.77 nm
[#117] $${Gamma _g} = frac{{dx08eta }}{{{C^ * }dk}}.$$ xa0 What is β in the given equation?
Correct Answer
(B) Propagation constant
[#118] Disturbance along the fiber such as vibrations, discontinuities, connectors, splices, source/detectors coupling result in . . . . . . . .
Correct Answer
(A) Modal noise
[#119] In the design of a single-mode step index optical fiber close to upper cutoff, the single-mode operation is not preserved if
Correct Answer
(D) radius is doubled and operating wavelength is halved
[#120] Total internal reflection at the fibre wall can occur only if two conditions are met. One of the condition is the glass inside the fibre core must have a/an . . . . . . . . index of refraction than/as the index of refraction of the material surrounding the fibre core.
Correct Answer
(B) slightly higher