Optical Power & Loss Budgets Flashcards
1
Q
What are the componets and abreviation of a optical link?
A
Tx LED - Light emitting diode VCSEL - vertical Cavity surface emitting laser LASER - Light amplification by the stimulated emsion of radiation RX Avalanche Photo Diode P-N Photo Diode P-I-N Photo Diode
2
Q
Explain dB and how its measured?
A
A decibel is a ratio of two levels, one of wich is considerd the refernce value, the other is the received value.
3
Q
Loss of power is measured in what Unit?
A
dB
4
Q
Loss in optical power is measured in what unit?
A
dBm (??????????)
5
Q
What is the dB equation?
A
dB = 10 log (power in / power out)
6
Q
What does 0dBm relate to?
A
1mW
7
Q
How much power have we lost if we have a -6dB?
A
75%
8
Q
How much power is lost if we have a -20dB?
A
99%
9
Q
Optical loss budget: attenuation at following? OM1 MM 62.5um @ 850nm and 1300nm OM2 MM 50um @ 850nm and 1300nm OM3 MM 50um @ 850nm and 1300nm OM4 MM 50um @ 850nm and 1300nm
A
All are:
3.5 dB/Km @ 850 and 1.5 dB/Km @ 1300nm
10
Q
Component attenuation for?
Fusion/Mechanical splice
Single referenced connector
Pair of mated connectors
A
- 3 dBm
- 3 dBm
- 75 dBm
