Optoelectronics refers to the communication between optics and electronics, including the study, design, and manufacture of devices that convert electrical energy into light and vice versa through the use of semiconductors. Optoelectronics devices are made from solid crystalline devices which are lighter than metals but heavier than insulators. These devices can be found in optoelectronic applications such as defense, telecommunications, automatic access control systems, and medical equipment. Optoelectronic devices are classified into five types: photodiodes, solar cells, light emitting diodes (LEDs), optical fibers, and laser diodes. This blog will explain each type and its unique applications.