Japan, March 25 -- NEC Corporation has started international sales of a 25G tunable SFP extended reach optical transceiver equipped with a tunable laser that improves transmission distance from the 15km of conventional products to 40km, one of the longest transmission distances in the industry. The transceiver also enables reductions in both installation and maintenance costs, which helps to meet the demand for expanding 5G mobile network and access network areas.The new product uses NEC's original silicon photonics optical modulator to reduce the effects of wavelength dispersion, a characteristic of optical fiber that has limited the transmission distance of previous products. In addition, by adopting an electrical dispersion compensation ...