COB packaging technology stands out for its ability to integrate optical components directly onto a printed circuit board (PCB). This method uses epoxy resin adhesive to attach chips to the PCB, followed by wire bonding for electrical connections. Common optical device packaging methods include COB (chip-on-board packaging), BOX and coaxial packaging. This method offers a compact package size and high integration level, which is particularly beneficial for applications requiring dense configurations, such as. Chip On Board (COB) is a relatively new type of packaging technology.