Why do junction boxes of solar modules install diodes?

Why do junction boxes of solar modules install diodes?

What is FTTH optic  fiber access technology

FTTH optic  fiber is the foreign language abbreviation of fiber optic direct to the home, and the Chinese abbreviation is fiber optic to the home. Specifically, FTTH optic  fiber refers to the installation of optical network units (ONUs) at home or business users, and is the closest optical access network application type to users except FTTD (fiber-to-the-desktop) in the optical access series. The remarkable technical feature of FTTH optic  fiber is that it not only provides greater bandwidth, but also enhances the transparency of the network to data format, rate, wavelength and protocol, relaxes the requirements for environmental conditions and power supply, and simplifies maintenance and installation. When it comes to FTTH optic  fiber, we must first talk about fiber access. Optical fiber access refers to the use of optical fiber as the transmission medium between the central office and users. Optical fiber access can be divided into active optical access and passive optical access. The main technology of optical fiber user network is light wave transmission technology. At present, the multiplexing technology of optical fiber transmission is developing very fast, and most of them are already in practical use. According to the degree of penetration of optical fiber into users, it can be divided into FTTC, FTTZ, FTTO, FTTF, FTTH, etc.