Ch6Sec4 - THE FIBER FORUM Fiber Optic Communications JOSEPH...

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Unformatted text preview: THE FIBER FORUM Fiber Optic Communications JOSEPH C. PALAIS PRESENTED BY Joseph C. Palais 6.4 2 Section 6.4 Laser Diode 10 m ~0.1 - 0.3 m 300 m Junction Region n p Metal Stripe Contact Laser Diode Metal V Joseph C. Palais 6.4 3 To produce oscillation we need: 1) Amplification 2) Tuning 3) Feedback LASER DIODE Joseph C. Palais 6.4 4 Feedback Cleave the front and back faces of the crystal. This provides mirror-like reflections. Example: AlGaAs, n = 3.6 on Transmissi % 68 Reflection % 32 32 . 6 . 3 1 6 . 3 1 2 2 2 1 2 1 = +- = +- = n n n n R LASER DIODE Joseph C. Palais 6.4 5 Amplification W g- - - - - - - - - - - - - - - - - - -- - - - - - - - - - - - - - + + + + + + + + + + + + + + + + + + + + + Hole Energy Electron Energy Original Photon Free Electrons Free Holes p LASER DIODE Stimulated Photon n Incoming Photon Forward Biased pn Junction Joseph C. Palais 6.4 6 LASER DIODE Forward current injects holes and electrons into the junction. Photons in the junction stimulate electron-hole recombination, with emission of added photons. This process yields gain. This process yields gain....
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This note was uploaded on 05/11/2010 for the course EEE EEE-448 taught by Professor Palais during the Fall '09 term at ASU.

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Ch6Sec4 - THE FIBER FORUM Fiber Optic Communications JOSEPH...

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