Fiber Optic Communication Lec 11 By

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Presentation transcript:

Fiber Optic Communication Lec 11 By Engr. Muhammad Ashraf Bhutta

Absorption Ground State E1 E2 E3 E4 E5 Excited state l = 122nm

Spontaneous Emission l =122nm E5 Excited state E4 E3 E2 E1 Ground State E1 E2 E3 E4 E5 Excited state l =122nm

Stimulated Emission Ground State E1 E2 E3 E4 E5 Excited state l =122nm

Energy Pumping Energy level diagram for a typical laser material. _ ~ Pumping level Lifetime 10 nsec ~ _ Level C Level B Level A Ground State Metastable state Lifetime 1 msec ~ _ X Y Energy level diagram for a typical laser material.