Patent ID: 9036138
Filing Date: 2015-05-19
Classification: G01M,G01N,H04B,H04J

Abstract:
1. A system for detecting a fiber fault in a Passive Optical Network (PON), comprising: an Optical Time Domain Reflectometer (OTDR), which is configured to transmit an optical path detection signal of which a wavelength corresponds to a branch fiber, receive an optical path detection reflection signal, and determine whether there is a fault in a trunk fiber or in the branch fiber according to a state of the optical path detection reflection signal; a Wavelength Division Multiplexing (WDM) coupler, which is configured to import the optical path detection signal onto the trunk fiber and transmit the optical path detection reflection signal transmitted by the trunk fiber to the OTDR; a wavelength selection coupler, which is configured to transmit the optical path detection signal which is on the trunk fiber to a branch fiber selector and import the optical path detection reflection signal, which is received from the branch fiber selector, back onto the trunk fiber; the branch fiber selector, which is configured to transmit the optical path detection signal to a corresponding wavelength selection router and transmit the optical path detection reflection signal, which is transmitted from the wavelength selection router, to the wavelength selection coupler; and the wavelength selection router, which is coupled with an Optical Network Unit (ONU) corresponding to the wavelength selection router through a branch fiber, and is configured to transmit the optical path detection signal to the ONU and transmit the optical path detection reflection signal which is on the branch fiber to the branch fiber selector; wherein the branch fiber selector is an Arrayed-Waveguide Grating (AWG), and the AWG comprises: a general interface, which is coupled with the wavelength selection coupler; a plurality of grating branch inputs/outputs, which are coupled with the corresponding wavelength selection router on each branch fiber and are configured to transmit the optical path detection signal to the corresponding wavelength selection router according to the wavelength of the optical path detection signal.