Introduction to Optical Detector
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Optical detectors, as the name implied, can detect the amount of light received. It is a device that converts light signals into electrical signals, which can then be amplified and processed.
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Introduction to Optical Detector
- 1. Introduction to Optical Detector BHAGYASHRI THORAT Electronics & Telecommunication International Institute of Information Technology, I²IT www.isquareit.edu.in
- 2. Introduction Optical Detector Essential component of optical fiber communication Convert the received optical signal into electrical signal then amplified before further processing
- 3. Performance and compatibility Requirements of Detector High sensitivity at operating wavelengths High fidelity Large electrical response to the received optical signal Short response time to obtain a suitable bandwidth A minimum noise introduced by a detector Stability of performance characteristics
- 4. Performance and compatibility Requirements of Detector continued Small size Low bias voltages High reliability Low cost
- 5. Types of Photodetector • Photomultiplier Tubes • Vacuum photodiodes • Bulky, and require high operating voltage External Photoemission Devices • Semiconductor photodiodes • Provides gain & good performance, low cost Internal Photoemission Devices
- 6. Semiconductor Photodetector Made from semiconductor silicon, germanium and increasing no. of III- V alloys Useful for Optical Communication System Internal photoemission process may take place in both intrinsic and extrinsic semiconductor Intrinsic absorption process is preferred.
- 7. First Generation Photodetector Semiconductor Photodetector High sensitivity over 0.8 to 0.9 µm wavelength band with adequate speed (hundreds of megahertz) Negligible shunt conductance Low dark current Long term stability Widely used in first generation system
- 8. Second Generation Photodetector 1.1 – 1.6 µm wavelength range Germanium and III-V alloy Photodetector
- 9. Third Generation Photodetector 1..55 µm wavelength InP and III-V alloy Photodetector
- 10. Photodiode Devices p-i-n Photodiode Avalanche Photodiode
- 11. References Optical Fiber Communication second edition By John M. Senior
- 12. Thank-You International Institute of Information Technology (I²IT) P-14, Rajiv Gandhi Infotech Park, MIDC Phase – 1, Hinjawadi, Pune – 411057, India info@isquareit.edu.in http://www.isquareit.edu.in/