Ch7Sec3 - THE FIBER FORUM Fiber Optic Communications JOSEPH...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: THE FIBER FORUM Fiber Optic Communications JOSEPH C. PALAIS PRESENTED BY Joseph C. Palais 7.3 2 Section 7.3 Semiconductor Junction Photodiode i hf R L v Reverse Bias p n hf V B +- Joseph C. Palais 7.3 3 SEMICONDUCTOR JUNCTION PHOTODIODE p n hf + + + + + + + + +- - - - - - - - - - - +- hf W g Junction Region Reverse Biased Photodiode Electron Energy E Joseph C. Palais 7.3 4 SEMICONDUCTOR JUNCTION PHOTODIODE An incident photon absorbed in the junction gives up its energy, creating a free electron and a free hole in the junction. The generated free charges move due to the strong electric field E in the junction. Recall that the electric field is generated by the change in electric potential V given by: V E- = Joseph C. Palais 7.3 5 As before A condition for detection is that the photon energy be greater than the bandgap energy: SEMICONDUCTOR JUNCTION PHOTODIODE hf eP i = hf e P i = = g W hf h W f g Joseph C. Palais 7.3 6 At cutoff, then g c W 24 . 1 = where W g is in eV and...
View Full Document

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.

Page1 / 12

Ch7Sec3 - THE FIBER FORUM Fiber Optic Communications JOSEPH...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online