Device for analyzing optical fiber path characteristics and method for analyzing same

Abstract

In the present invention, with respect to an optical fiber path (100) to be tested that branches a backbone optical fiber (F0) into N systems of branched optical fibers (F1-FN) by means of an optical splitter (SP), an optical reflection filter (R1-RN) is disposed at each end of the branched optical fibers (F1-FN), a test optical pulse is generated from a first and second test optical pulse at a predetermined time difference from a first and second test light having differing wavelengths, by means of an optical circulator (21), the test optical pulse is caused to enter the backbone optical fiber (F0) of the optical fiber path (100) to be tested, and the return light exiting from the entrance end is taken out, the stimulated Brillouin backscattering light is extracted by an optical filter (22), and the scattering light is received by an optical receiver (23); and converted to an electrical signal, and the electrical signal is digitally processed while chanting the time difference of the first and second test optical pulses by means of a computational processing device (25), by which means it is determined which branched optical fibers (F1-FN) the stimulated Brillouin scattering light is from, and the characteristic distribution for each branched optical fiber is determined.

Description

technical field [0001] The present invention relates to an optical line characteristic analysis device and analysis method for individually measuring the characteristics of each optical branch line branched by an optical splitter, for example, in a PON (Passive Optical Network: Passive Optical Network) type optical line . Background technique [0002] In an optical communication system using an optical line such as an optical fiber, an optical pulse line monitoring device is used to detect breakage of the optical line or to identify a breakage position. This optical pulse line monitoring device utilizes the principle that as light propagates in the optical line, backscattered light having the same wavelength as the light is generated and propagated in the opposite direction. [0003] That is, when an optical pulse is incident on the optical line as test light, backscattered light continues to be generated until the optical pulse reaches the breaking point, and return light ...

AI Technical Summary

Problems solved by technology

[0010] However, optical branching devices with wavelength routing functions, represented by arrayed waveguide diffraction grating wavelength division multiplexers, are usually very expensive, and it is difficult in terms of cost to accommodate a large number of access optical systems for joiners. used in

In addition, since such optical components are highly temperature-dependent and require an additional temperature adjustment function, the cost required for system construction becomes large.

Images