Accelight’s 25G PON OLT transceiver is designed for single mode fiber and operates at wavelength of 1358nm 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 1286nm or 1300nm 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 transimpedance amplifier. The differential non-Inverted DATA and inverted DATA CML data signals are produced by the limiting amplifier. The APD-TIA is AC coupled to the limiting amplifier through a low pass filter.