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TOPIC: OPTICAL DETECTOR APD Optical Fiber Communication STUDENT: NGUYEN THI HUYEN HOA NGUYEN THI THU UYEN NGUYEN QUOC PHUOC HO DINH DUNG LECTURER: TRAN THI KIEU 11/26/20 Content INTRODUCTION SUMMARY: PN, PIN,APD AVALANCHE PHOTODIODE 11/26/20 Content INTRODUCTION SUMMARY: PN, PIN,APD AVALANCHE PHOTODIODE 11/26/20 INTRODUCTION Optical Communication System PN Avalanche Photodiode Photodiode 11/26/20 Hình Optical Communication System Nguồn: Internet Content INTRODUCTION SUMMARY: Photodiode, PIN Photodiode AVALANCHE PHOTODIODE 11/26/20 SUMMARY P-N junction 11/26/20 SUMMARY P-N junction Etx 11/26/20 SUMMARY P-N junction Forward Bias 11/26/20 Forward Bias SUMMARY Photodiode Photon Photodiode Diode (P-N junction) 11/26/20 SUMMARY Photodiode 11/26/20 10 SUMMARY Photodiode Disadvantage Temperature dependent device 11/26/20 12 SUMMARY PIN Photodiode 11/26/20 13 SUMMARY PIN Photodiode 11/26/20 14 SUMMARY PIN Photodiode Most of the photon are absorbed in the intrinsic region Most carriers are generated in the intrinsic region, because that can be much thicker than depletion region of a p-n structure 11/26/20 15 SUMMARY PIN Photodiode Core Disadvantage 11/26/20 Depletion region is expanded Require large reverse bias voltage 16 Content INTRODUCTION SUMMARY: Photodiode, PIN Photodiode AVALANCHE PHOTODIODE 11/26/20 17 AVALANCHE PHOTODIODE What is the Avanlanche Photodiode ? • • 11/26/20 It conver light energy in to electrical signal Designed to operate in reverse bias condition They use avalanche breakdown to give gain 18 AVALANCHE PHOTODIODE Image about APD 11/26/20 19 AVALANCHE PHOTODIODE Structure of APD 11/26/20 20 AVALANCHE PHOTODIODE Avalanche Breakdown 11/26/20 21 AVALANCHE PHOTODIODE Working of APD https://electronics360.globalspec.com/article/10397/pin-vs-apd-different-sensitivity-different-applications 11/26/20 22 AVALANCHE PHOTODIODE Advantages and Disadvantages of APD Advantages Avalanche gain -> high sensitivity Disadvantages • • • High operating voltage is required At high voltage -> noise is high Avalanche process means that output is no linear 11/26/20 23 AVALANCHE PHOTODIODE Application • • • • 11/26/20 Laser range finder Speed gun Fast receiver modules for data communications High speed laser scanner 24 AVALANCHE PHOTODIODE Parameters PIN Photodiode APD Layers + + P -I-N + + P -π-I-N Gain high sensitivity Disadvantages • • • High operating voltage is required At high voltage -> noise is high Avalanche process means that output is