Optical module sizes are different
Many different forms of optical modulation and multiplexing have been employed in optical modules. The size of a DLP optical module primarily depends on the DMD size (see Figure 2-2), optical design, and illumination size. That is, metal medium communication represented by coaxial cables and network cables is gradually being replaced by optical fiber media. 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. These modules, including SFP, SFP+, and SFP28, are widely used in enterprise networks, data centers, and carrier-grade deployments.
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