Welcome!
According to whether external energy is needed to drive photoelectric conversion during work, optical devices are classified into active devices and passive devices; The former is the heart of optical transmission systems that require external energy to drive operation and can convert electrical signals into optical signals or vice versa; The latter is an optoelectronic device that does not require external energy to drive its operation. It mainly includes fiber optic connectors, fiber optic couplers, wavelength division multiplexers, optical attenuators, and optical isolators, which are the joints of optical transmission systems.
In active devices, the device that converts electrical signals into optical signals is called a light source, and the device that converts optical signals into electrical signals is called a photodetector. Among them, the light source devices mainly include semiconductor light emitting diodes (LEDs) and laser diodes (LDs), while the light detectors mainly include photodiodes (PINs) and avalanche photodiodes (APDs).
According to functional classification, optical devices can be specifically divided into categories such as transmitting and receiving devices, wavelength division multiplexing devices, gain amplification devices, switching devices, and system management devices. Among them, the transmitting and receiving devices were separated into two independent components in the early days - the transmitting and receiving module (TOSA) and the receiving module (ROSA). It was not until later, with the development of miniaturization, that the two were combined into a "transmitting and receiving module" (BOSA) with both transmitting and receiving functions.
Specifically, there are numerous categories of optical devices, with approximately 9000 different types.
WeChat 
