TTQ 5-3 Attenuation Limit
TTQ 5-3 Attenuation Limit
TTQ 5-3 Attenuation Limit
Chapter 5.3
Pham Quang Thai
Pqthai.hcmut@gmail.com
Optical modulator
Analog link noise factor
Digital link dispersion limit
Digital link attenuation limit
Multiple wavelengths link
Power budget
Attenuation -> power loss -> received
power?
Power budget
The Si PIN & APD and InGaAsP PIN plots for BER= 10 . The InGaAs APD plot is for
BER=10 11
.
9
29 8
L[km]
6
3.5
10
11
Attenuation compensation
Optical amplifier
3 energy level -> pump -> popular
inversion -> stimulated emission -> light
amplification
12
13
Multi-wavelength link
Several wavelengths are combined
into one fiber
14
15
16
17
18
19