A GaAs LED is to be coupled with an optical fiber at an acceptance angle of 55, the fiber core refractive index is 1.4, caleulate the critical angle above which light can propagate in the fiber Select one: OA. 51.04 Degrees OB. 54.19 Degrees OC. 55.97 Degrees OD. 52.56 Degrees OE. 49.19 Degrees
A GaAs LED is to be coupled with an optical fiber at an acceptance angle of 55, the fiber core refractive index is 1.4, caleulate the critical angle above which light can propagate in the fiber Select one: OA. 51.04 Degrees OB. 54.19 Degrees OC. 55.97 Degrees OD. 52.56 Degrees OE. 49.19 Degrees
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Transcribed Image Text:A GaAs LED is to be coupled with an optical fiber at an acceptance angle of 55, the fiber core refractive index is 1.4, caleulate
the critical angle above which light can propagate in the fiber
Select one:
OA. 51.04 Degrees
OB. 54.19 Degrees
OC.55.97 Degrees
OD. 52.56 Degrees
OE. 49.19 Degrees
Transcribed Image Text:: Si, Ge, GaAs Parameters and Universal Constants
UNIVERSAL CONSTANTS
Properties
SEMICONDUCTOR
6.63 x 10-34 J.s
Si
Ge
Ga As
-31
m.
9.11 x 10
Kg
Eg (eV)
1; (cm-3)
Hn (cm2/V-s)
4p (cm2/V-s)
Ne (em-3)
N. (cm-3)
m/m.
m, /m.
& (F/m)
1.1
0.67
1.42
3.14
1.5 x 1010
2.3 x 1013
1.8 x 106
1.602 x 10-19C
1500
3900
8500
Eo
8.85 x 10-12 F/m
450
1900
400
1.05 x 10-4 J-s
2.78 x 1019
1.04 x 1019
4.45 x 1017
K
8.6 x 10-5 eV/K
9.84 x 1018
6 x 1018
7.72 x 1018
KT/q
26 mV (T 3 300 К)
0.082
0.98
0.067
KT
26 meV (T 300 K)
0.28
0.49
0.45
3 x 10 m/s
C
11.7
16
13.1
nair = 1
nGaAs = 3.66
Some useful relations
EgA Ga-As(r) = 1.424 +1.247r
Egin,Gaz -As(r) = 0.36+1.064r
1 eV = 1.602 x 10-19 J
1 KG = 1 x 10-5 Wb/em2
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