A passive wave division replication network optical fiber failure detection system and its detection method

Abstract

The present invention is a passive wavelength division multiplexing network optical fiber fault detection system and a detection method thereof, belonging to the technical field of passive wavelength division multiplexing network optical fiber fault detection systems; the technical problem to be solved is: to provide a passive wavelength division multiplexing network optical fiber fault detection system. The improvement of the structure of the optical fiber fault detection system and the detection method using the network; the technical scheme adopted to solve the technical problem is: including a chaotic laser generator, the signal output end of the chaotic laser generator is connected with the second input end of the first optical circulator The signal output end of the first optical circulator is connected in series with the optical isolator and then connected with the input end of the first fiber coupler; The input end of the modulator is connected, the output end of the phase modulator is connected with the first input end of the first optical circulator; the modulation interface of the phase modulator is also connected with a random signal generator; the invention is applied to optical fiber fault detection.

Description

technical field [0001] The present invention is a passive wavelength division multiplexing network optical fiber fault detection system and a detection method thereof, belonging to the technical field of passive wavelength division multiplexing network optical fiber fault detection systems. technical background [0002] Optical fiber fault detection is carried out by using a passive wavelength division multiplexing network (Wavelength-division-multiplexing passive optical network, referred to as WDM-PON), which mainly uses wavelength-tunable optical pulse technology [Optics Express, vol.15, pp.1461-1466 , 2007; IEEE Photonics Technology Letters, vol.20, pp.1323-1325, 2008] and chaotic optical time domain reflectometer technology [Journal of LightwaveTechnology, vol.30, no.21, pp.3420-3426, 2012; Optical Fiber Technology,vol.20,pp.163-167,2014,Optics Communications,vol.350,pp.288-295,2015;OpticalLetters,vol.38,pp.3762-3764,2015;Optics Express,vol.23 , pp.2416-2423, 2015], co...

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Problems solved by technology

[0004] However, when the above-mentioned technology is used for fault detection of optical fiber, the chaotic laser band generated by optical feedback has "side lobes" (that is, the length information fed back from the external cavity), which will cause detection misjudgment, which is limited by the modulation depth of electrical modulation. The bandwidth of the generated chaotic laser is too narrow to achieve higher-precision fault location; therefore, it is necessary to invent a high-precision optical fiber fault detection system based on WDM-POM to solve the false alarm (false alarm) of the existing chaotic optical time domain reflectometer technology. Judgment), the problem of short distance and poor accuracy

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