The wavelengths used for optical communication correspond to the wavelength bands where optical fibers have small transmission loss as shown in Figure 1, and the range from 1260 nm to 1625 nm is divided into the five telecom optical wavelength bands named O-, E-, S-, C- and L bands.
Among these bands, the O-band was the first band used to optical communication because of the small pulse broadening (small dispersion); it is called the Original-band. The C-band has a benefit of small transmission loss and is used most commonly along with the development of ultra-long distance transmission, EDFA, and WDM technologies.
Though various wavelength bands of the O-, S-, C- and L- bands have come into use with the explosive expansion of the traffic in recent years, the optical fiber amplifiers for the O- and S-band wavelengths were not realized for many years because of many technical hurdles.
With the original fluoride fiber technology, FiberLabs has successfully developed optical fiber amplifiers for the O- and S-bands and 850 nm of wavelengths. With world-leading optical amplification technology , FiberLabs presently provides optical amplifiers of a variety of wavelength bands, including 850nm-, 980 nm-, 1030nm-, O-, S-, C-, L-, CL-, and SCL-bands.
Fig.1 Transmission loss of a silica fiber & Telecom optical wavelength bands
Fig.2 The electromagnetic spectrum & telecom optical wavelength bands