An optical module usually consists of an optical transmitting device (TOSA, including a laser), an optical receiving device (ROSA, including a photodetector), functional circuits,main control circuit board (PCBA), housing and optical (electrical) interface and other components. T/R modules set up system performance in a phased array. Why a phased array? As Leonard Cohen stated, everybody knows that mechanically gimbaled systems eventually wear out (perhaps the rotary joint goes first), and radars are expected to be reliable, especially when public safety is on the line. Optical modules typically have an electrical interface on the side that connects to the inside of the system and an optical interface on the side that connects to the outside. That is, metal medium communication represented by coaxial cables and network cables is gradually being replaced by optical fiber media. Composition of Optical Modules The optical module, known as Optical Transceiver in. The optical module serves as a crucial component in optical fiber communication systems, operating at the physical layer, which is the lowest layer in the OSI model. Its primary function is to achieve optoelectronic conversion by converting electrical signals into optical signals and vice versa. This article will introduce you to the. Optical modules are available in various types to meet diversified requirements. The higher transmission rate an optical module provides, the more complex structure it has.