EPON means Ethernet Passive Optical Network. These cables give fast and steady internet to homes and businesses. Many users can connect with fewer cables. ONT stands for. A passive optical network (PON) is a fiber-optic telecommunications network that uses only unpowered devices to carry signals, as opposed to electronic equipment. In this use, a PON. Building a high-performance FTTH network requires more than just laying fiber—it demands the right PON technology to deliver scalable, reliable, and cost-effective services to end-users.
[pdf] Although most people want to make measurement in units of dBm or Watts, an optical power meter is only capable of measuring either the current or the voltage generated by a photodetector. When interfacing with a photodiode, the quantity that must be measured is current. In fiber optics, lasers, sensors, and optical communication links, this measurement is central to confirming that signals are strong enough to perform reliably without overloading. Quantum efficiency is dependent on many factors, but in general if the energy of the photon, E = h v, is greater than the energy gap of the device, these photons will be absorbed very near the surface where the recombination rate is high and will contribute to the photocurrent.
[pdf] 
