WorksheetsDispersion in optical fiber
Total questions: 11
Worksheet time: 10mins
What is dispersion in optical fiber communication?
Compression of light pulses
Broadening of transmitted light pulses along the channel
Overlapping of light pulses on compression
Absorption of light pulses
For no overlapping of light pulses down on an optical fiber link, the digital bit rate BT must be:
Less than the reciprocal of broadened pulse duration
More than the reciprocal of broadened pulse duration
Same as that of than the reciprocal of broadened pulse duration
Negligible
The maximum bit rate that may be obtained on an optical fiber link is 1/3Γ. State whether the given statement is true or false.
True
False
3dB optical bandwidth is always ___________ the 3dB electrical bandwidth.
Smaller than
Larger than
Negligible than
Equal to
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?
6.12ns/km
7.69ns/km
10.29ns/km
8.23ns/km
A multimode graded index fiber exhibits a total pulse broadening of 0.15μsover a distance of 16 km. Estimate the maximum possible bandwidth, assuming no intersymbol interference.
4.6 MHz
3.9 MHz
3.3 MHz
4.2 MHz
Chromatic dispersion is also called as intermodal dispersion. State whether the given statement true or false.
True
False
The optical source used in a fiber is an injection laser with a relative spectral width σλ/λ of 0.0011 at a wavelength of 0.70μm. Estimate the RMS spectral width.
1.2 nm
1.3 nm
0.77 nm
0.98 nm
In waveguide dispersion, refractive index is independent of
Bit rate
Index difference
Velocity of medium
Wavelength
Intermodal dispersion occurring in a large amount in multimode step index fiber results in
Propagation of the fiber
Propagating through the fiber
Pulse broadening at output
Attenuation of waves
After Total Internal Reflection the Meridional ray
Makes an angle equal to acceptance angle with the axial ray
Makes an angle equal to critical angle with the axial ray
Travels parallel equal to critical angle with the axial ray
Makes an angle equal to critical angle with the axial ray
