SPIE is a non-profit dedicated to advancing the scientific research and engineering applications of optics and photonics through international conferences, education programs and publications. 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. Serving a global membership of over 25,000, we bring engineers, scientists, students, and business professionals together to advance light-based science and technology. Whether you are creating a 100-Gbps or 400-Gbps, small form-factor pluggable (SFP) module, SFP+ transceiver, XFP module, CFP, X2/XENPAK module.