Data rate - Mbps: Determine Data Rate of the application e. Optical Wavelength – Nanometers (nm): What is source wavelength of light in present setup e. Fiber Type: Multimode or Single mode. An optical communications repeater is used in a fiber-optic communications system to regenerate an optical signal. Some repeaters also correct for distortion of. Nexans ROC-2 family cables are designed with the industry standard vault cable core, which provides very good hydrostatic pressure resistance, high tensile strength, interlayer adhesion between the copper tube and steel wire interstices, longitudinal water-blocking, and a conductor for a 15kV. ity of long-distance optical signal transmission systems are being further researched and devel-oped, and optical submarine cable systems for applying the latest te hnologies are being planne and laid one after another. This paper describes the performances and technologies of the submarine. As we approach the half century mark for the dawn of the era of optical communications, it is appropriate to take stock of the journey of discovery and application of this empowering technology. As with most new technologies, the engineering challenges associated with its assimilation into the. Fiber optic cables are ideally suited for long distance communications. However, there are situations where link loss (attenuation) is too high due to splice, patch panels, number of connectors, or combination of fiber sizes.