The Properties Of Rayleigh Backscattering In Optical Fiber With Arbitrary Input Optical Pulses

Rayleigh backscattering is an important physical process in optical fibers, and the Optical Time Domain Reflectometer (OTDR), which is based on the Rayleigh backscattering, is one of the most important and widely-used optical fiber measuring equipment. It is mainly used for optical fiber measurement. In addition, the Rayleigh backscattering which based on distribute optical fiber sensing technology, has a huge advantage as it connects transmission and sensing synchronous, so it has a broad application in the area of optical communication.This article focuses on the Rayleigh Backscattering with arbitrary input optical pulses in the optical fiber, the researching results of this thesis can be described as follow:1. It researches theoretically the physical progress of Rayleigh Backscattering with arbitrary input optical pulses in the optical fiber.2. It derives the impulse response function on the basis of regarding fiber as a linear system, taking square pulse as example, researches its Rayleigh backscattering in experiment and in simulation. The theory of impulse response is demonstrated by commercial OTDR instrument.3. It also discusses experimentally the backscattered output pulse of pulse with vibrating. Firstly, an experimental platform of Rayleigh backscattering is set up, as the transient characteristic of Erbium-doped fiber amplifier, the pulse which amplifier is vibrated, and also, this pulse is taken as the input pulse of Rayleigh backscattering. For the pulse with vibrating, the experiment data shows a good agreement with simulation.4. It finally discusses the Raman backscattering and brillouin backscattering progress in frequency domain. It focuses on frequency domain detection and theoretical demonstration.This research work is mainly used for improving the theory of Optical Time Domain Reflectometer technology when the input pulse is not strictly typically square wave, and it can also used for improving the accuracy and resolution of Optical Time Domain Reflectometer measurement.