Patent ID: 8077298
Filing Date: 2011-12-13
Classification: G01M

Abstract:
1. An apparatus of monitoring optical fiber obstructions in a passive optical network, comprising: a broadband-monitoring light source module transmitting optical signals of a monitoring waveband to an optical circulator; the optical circulator receiving the optical signals of the monitoring waveband sent by the broadband-monitoring light source module; an optical channel selector receiving the optical signals of the monitoring waveband from the optical circulator and sending to a wavelength division multiplexer, and switching to a different-passive optical network according to a monitoring procedure; wherein the wavelength division multiplexer integrating a service waveband and the monitoring waveband and transmitting to an optical fiber of the passive optical network; a specific wavelength optical filter receiving the monitoring waveband in the optical fiber and filtering most of the wavelength in the monitoring waveband except for a specified monitoring wavelength corresponding to a branch of the optical fiber, and a monitoring-waveband reflector along with the optical signals of the service waveband is connected to the end of the branch; wherein the monitoring-waveband reflector receiving the specified monitoring wavelength sent from the specific wavelength optical filter and reflecting a specified monitoring wavelength of the branch; wherein the optical circulator receiving the optical signals of the monitoring waveband reflected back from the optical network unit and sending the reflected optical signals to an optical spectrum analyzer; the optical spectrum analyzer receiving and measuring the wavelength and optical power of each of the monitoring waveband sent by the optical circulator and reflected back from the optical network unit to acquire a reflective waveform diagram; a controlling computer retrieving and analyzing the reflective waveform diagram to locate obstructed routes and to execute a procedure of measuring an obstruction location; and a high density multi-wavelength OTDR sending a specified measuring wavelength that corresponds to an obstructed branch to the optical channel selector for a comparison and analysis of the controlling computer to acquire the obstruction location of the obstructed branch.