Research on the Optical Fiber parameter test method (1)

1. Introduction

The rapid development of optical fiber communication technology increases the demand for optical fiber cables. At present, hundreds of millions of kilometers of optical fiber has been laid around the world. Optical Fiber Communication is not only used on land, but also forms a submarine cable line spanning the Atlantic Ocean and the Pacific Ocean, almost surrounded the whole earth. The cables are divided into self-bearing overhead optical cables, pipe optical cables, armored underground cables and submarine optical cables. According to the optical cable structure: bundle pipe optical cable, layer Twisted Type Optical Cable, tight type optical cable, belt cable, non-metallic optical cable and branch optical cable. By optical cable usage: optical fiber cables for long-distance communication, short-distance outdoor cables, hybrid optical cables, and optical fiber cables for buildings. The demand for optical fiber cables is huge in China and the world, ensuring the quality of optical fiber cables is crucial. The test of basic optical fiber parameters guarantees the quality of optical fiber cables.

Optical fiber cables are the media for optical signal transmission and are the basis of optical communication. For information in this field, see the International Electrotechnical Commission IEC 793-1-2: 1995 Optical Fiber Part 1: General Specification Article 1: dimensional parameter test methods, IEC 1st-1-4: 1995 Optical Fiber Part 1: General Specification Article 1: Test Methods for transmission characteristics and optical properties and ITU ITU-T G650: 1st definition and test methods for Single-Mode Optical Fiber-related parameters, ITU-T G651: 1993 "50/125 μm multimode Gradient Refractive index optical fiber cable characteristics" and other related international standards have formulated the National Standard of optical fiber cable GB/T 15972.2-1998 "total optical fiber specifications 2nd part: dimensional parameter test method and GB/T 15972.4-1998 Optical Fiber General Specification Part 1: Test Methods for transmission and optical properties, the basic test parameters and test methods of optical fibers are specified.

These standards regulate the specific performance indicators of optical fiber cables. The optical fiber characteristic parameters are divided into geometric characteristic parameters (optical fiber length, core diameter, package layer diameter, incircle of the core, incircle of the package layer, core/package layer concentricity error, etc) optical Characteristic Parameters (modulus Field Diameter, cut-off wavelength of single-mode optical fiber, cut-off wavelength of single-mode optical fiber, refractive index distribution, numerical aperture of multi-mode optical fiber, etc) transmission Characteristic Parameters (attenuation, wavelength dispersion, etc ).