51. The high index contrast enables the PCF core to be reduced from around 8 μmin conventional fiber to . . . . . . . . .
52. Absorption losses due to atomic defects mainly include . . . . . . . .
53. The modal noise occurs when uncorrected source frequency is?
54. An optical fiber has a core radius 2μm and a numerical aperture of 0.1. Will this fiber operate at single mode at 600 nm?
55. Skew rays follow a . . . . . . . .
56. What is pulse dispersion per unit length if for a graded index fiber, 0.1μs pulse broadening is seen over a distance of 13 km?
57. The optical source used for detection of optical signal is . . . . . . . .
58. 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.
59. $${\Gamma _g} = \frac{{d\beta }}{{{C^ * }dk}}.$$ What is β in the given equation?
60. Disturbance along the fiber such as vibrations, discontinuities, connectors, splices, source/detectors coupling result in . . . . . . . .
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