This section will take you through the foundational concepts of PN junction, the difference between LED and LASER optical sources. You will also learn about the optical detectors, principles, operations, and driving mechanisms of PIN and APD devices. Thus, this section covers the following lessons:

• Basics Concepts of a PN Junction.
• Type of Optical Sources LED and LASER.
• Optical Detectors.
• Principal, Working and Driving of PIN and APD.