Practically in all kind of communication system, more or less losses are involved. To make the system more efficient, it is needed to identify and trace the faults & losses so that suitable techniques can be implemented to eliminate or reduce the losses. In optical fiber communication, optical time domain reflectometry (OTDR) is a commonly used technique for characterization and fault location of optical fiber transmission systems. It involves measuring the fraction of a probe pulse that is scattered back (by Rayleigh scattering) from a silica fiber. Because of the very small levels of backscatter in single-mode fiber at long wavelengths, very sensitive optical detection is necessary to achieve adequate range performance. This paper presents a practical approach, to understand the extent of feasibility of optical fiber cable (OFC) fault detection and rectification technique, being used in the India’s largest telecom service providing organization, Bharat Sanchar Nigam Limited (BSNL). BSNL has a 686644 Km OFC network which covers the entire country. The actual place of fault shows variation with the measured value of OTDR. Hence it becomes a tedious work to locate the actual place of fault, which leads to an uneconomical and time taking rectification method. The practically observed values of OTDR show the gradual decrement of accuracy in locating the actual place of fault. To solve the problem an algorithm is proposed. At the end of this paper, the experiment results are shown to verify the algorithm.
The AQ1000 satis es test and measurement needs in analyzing access optical networks. Wavelengths: 1310 / 1550 nm Dynamic ranges: 32 / 30 dB Size: 185 mm (W) × 116 mm (H) × 56 mm (D) Weight: 660 g Multi-touch touchscreen, Intuitive and responsive Tap, swipe, pinch or press. the high resolution, responsive 5.0-inch multi-touch […]
OTDR used in fiber network acceptance test We will use the manual method of OTDR operation. Start the OTDR and select the correct wavelength and refractive index for the test. Set the OTDR’s measurement mode to “Two Point Attenuation”. In this mode, the OTDR allows you to set markers at any two points on the backscatter […]
Problem Cause Solution The application displays a message indicating that a “Non-resolved fiber end” event has been found. The fiber under test is too long. Ensure that the fiber under test is shorter than the maximum length the OTDR can measure. The application displays a message indicating that a “live fiber error” occurred and the […]