Accelight’s XGS-PON OLT transceiver is designed for single mode fiber and operates at wavelength of 1577nm continuous-mode on transmitter side. The transceiver module uses an EML and fully compliant with IEC60825 and CDRH class 1 eye safety. The burst-mode receiver section at 1270nm uses a hermetic packaged APD-TIA (APD with trans-impedance amplifier) and a limiting amplifier. The APD converts optical power into electrical current and the current is transformed to voltage by the trans-impedance amplifier. The differential non-Inverted DATA and inverted DATA CML data signals are produced by the limiting amplifier.