ELDIS (주식회사 엘디스) is a company that produces components for Wavelength Division Multiplexing-Passive Optical Network (WDM-PON). It offers Injection-locking LD for colorless optical sources for WDM-PON systems, R-SOA for WDM-PON colorless reflective amplifying modulators, and DFB-LD for coarse and dense wavelength division multiplexing and fiber to the home.