Proc. SPIE. 9156, Optical Technologies for Telecommunications 2013
KEYWORDS: Signal to noise ratio, Fiber optics, Backscatter, Networks, Interference (communication), Personal digital assistants, Reflectometry, Signal processing, Analog electronics, Fiber optic networks
All modern optical time-domain reflectometers (OTDR) are digital. A peculiarity of a backscatter signal in fiber-optic networks is a wide dynamic range that leads to high demands of a number of digit ADC. Moreover, ADC should be of high speed and low nonlinearity. In this paper we discuss specificity of working ADC in OTDR and the effect of ADC parameters on OTDR features.
The article explores multiplexers (MUX) and demultiplexers (DEMUX) based on the angular dispersion effect. The article presents calculation of the reflective prism based on MUX-DEMUX CWDM built under the Littrow scheme, as well as the requirements to its optical elements.
The paper contains the results of simulation of Raman optical amplifiers with copropagating and counterpropagating pumping. The computer program was developed to calculate signals and noise of amplified spontaneous emission for various lengths of amplifier sections. The various applications of optical amplifiers allowing to increase regenerator section length are considered. The results of calculations are of interest to the designers of long-haul fiber-optic communication systems.