Which one of the following specifications does not fit for a sing
A. The bandwidth is 1 GHz/km.
B. The digital communication rate is excess of 2000 Mbytes/s.
C. More than 100000 voice channels are available.
D. The mode field diameter (MFD; spot size) is larger than the core diameter.
Please scroll down to see the correct answer and solution guide.
Right Answer is: A
SOLUTION
Single-mode means the fiber enables one type of light mode to be propagated at a time. This is explained with the help of the following diagram:
1) Single-mode fiber core diameter is much smaller than multimode fiber.
2) For single-mode fiber, the B.W ranges from 50 to 100 GHz/km
Statement 4 is incorrect
|
|
Single-mode |
Multimode |
|
Light Source |
Laser or laser diodes |
Vertical cavity surface-emitting lasers |
|
Wavelength |
1310 nm & 1550 nm |
850 nm & 1300 nm |
|
Bandwidth |
Unlimited because it allows only one light mode to pass through at a time |
Limited by its light mode |
Advantages of single-mode fiber:
1) Low signal loss
2) High data rates
3) Does not suffer from modal dispersion
4) Can be used for higher bandwidth applications
5) Long-distance applications
6) Cable TV ends
7) High speed local and wide area network
