Optical Fiber Transmission Characteristics Detection Based On Random Signal Correlation

The rapid development of optical fiber communication technology, a large number of laying for optical fiber, the rapid increase of information, which put forward higher requirements for the transmission properties of optical fiber. Quick and precise measurement for the transmission properties of optical fiber will play an important role in the process of maintenance and repair for optical network, and is a precondition to ensure normal operation of optical network. According to the fiber attenuation of single mode fiber and the fiber dispersion of multimode fiber, we have realized the detection of this transmission characteristics utilizing the chaotic signal and amplified spontaneous emission.Focusing on the detection of optical fiber transmission characteristics, this thesis is mainly summarized as follows:1. We introduce the attenuation and dispersion of optical fiber, and analyze the existing detection methods for optical fiber transmission properties.2. We clarify the basic concepts of chaotic signal and amplified spontaneous emission, and have analyzed the main features.3. Based on pulse chaotic correlation method, we put forward a method of detection for optical fiber event information and attenuation characteristics. We analyze the principle of the measurement and experimental measurement. We discuss the influence of the chaotic sequence lengths and electro-optic modulator extinction ratio. The result show that this method solves the contradiction between resolution and range in pulse measurement. Events blind is only related to the signal bandwidth. The events blind of this system is46cm.4. On the basis of chaos correlation method of ranging, we use amplified spontaneous emission to measure the differential mode delay of multimode fiber. We theoretical analyze the feasibility of this method, and measure the differential mode delay of multimode fiber under restricted mode excitation. We also analyze the signal to noise ratio, measurement resolution, measuring error of this method. This method has a simple structure, low cost and high signal-to-noise ratio.