Selective OTDR measurements at the central office of individual fiber links in a PON

Abstract

Our proposal adds an arrayed waveguide grating (AWG) operated at 1.5 mu m to the star coupler of a passive optical network (PON) in the remote node (RN) and separates the original PON and the overlay via 1.3/1.5 mu m splitters, which guarantees the maintenance function

High Dynamic Range Externally Time-Gated Photon Counting Optical Time-Domain Reflectometry

“…. The three terms in (2) in order are the count generated by the scattering units before, within and after the gate, respectively. Finally, after recovering the whole trace, we infer the total photon count of our scheme,…”

“…PTICAL time-domain reflectometry (OTDR) is a representative distributed fiber optic sensor. Since its first demonstration in 1976 [1], it has been successfully employed in many fields such as optical fiber communication [2], high-voltage transmission lines [3], oil and gas pipelines [4], etc. Most of commercially available OTDR systems are based on linear photon detectors, such as PIN or avalanche photodiodes (APDs).…”

LabVIEW Applications for Optical Amplifier Automated Measurements, Fiber-Optic Remote Test and Fiber Sensor Systems

“…The OTDR functions as a measurement unit and the optical power splitter divides an input power equally into output ports. The optical power splitter can be replaced by an optical switch [12]. The measurement process begins as the OTDR injects a short light pulse into the optical power splitter.…”

Optical layer monitoring in Passive Optical Networks (PONs): A review

“…The by-pass of the splitters is performed by using wavelength mux/demux. Thus no active electronic devices (no powering) are required at the OSP [15], [16].…”