Passive wavelength division multiplexing network optical fiber fault detection system and detection method thereof

Abstract

The invention discloses a passive wavelength division multiplexing network optical fiber fault detection system and a detection method thereof, and belongs to the technical field of passive wavelengthdivision multiplexing network optical fiber fault detection systems. The technical problem to be solved is to provide an improvement of the passive wavelength division multiplexing network optical fiber fault detection system structure and a detection method thereof. According to the adopted technical scheme solving the technical problems, the passive wavelength division multiplexing network optical fiber fault detection system structure comprises a chaotic laser generator, the signal output end of the chaotic laser generator is connected with the second input end of a first optical circulator, and the signal output end of the first optical circulator is connected with an optical isolator in series and then connected with the input end of a first optical fiber coupler; the first output end of the first optical fiber coupler is sequentially connected with a polarization controller and an optical attenuator in series and then is connected with the input end of a phase modulator, and theoutput end of the phase modulator is connected with the first input end of a first optical circulator; and the modulation interface of the phase modulator is also connected with a random signal generator. The system and the method are applied to optical fiber fault detection.

Description

technical field [0001] The invention discloses 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. [0002] technical background [0003] Optical fiber fault detection using passive wavelength-division multiplexing network (WDM-PON for short), mainly using 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 Lightwave Technology, 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; Optical Letters, vol.38, pp.3762-3764, 2015; Optics Express, vol.23 , pp.2416-2423, 2015], compared with optical pulses as the light source for fiber breakpoin...

AI Technical Summary

Problems solved by technology

[0005] 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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