Basic structure and working principle of optical fiber cold connector

In the field of optical fiber splicing, mechanical optical fiber splicing and welding are two different ways to realize the fixed connection of optical fibers. Mechanical optical fiber splicing, commonly known as optical fiber cold splicing, refers to the way to realize the permanent connection of single-core or multi-core optical fibers through simple splicing tools and mechanical connection technology without welding machine. Mechanical optical fiber connection technology has its unique application advantages in FTTH. Mechanical optical fiber connectors used for splicing mechanical optical fibers are also called optical fiber cold connectors. Due to the different design architecture and core technology adopted by different manufacturers, the performance and operation mode are very different. When choosing a mechanical optical fiber connector, the aspects to be evaluated mainly include: the investment and maintenance requirements of the tool, the simplicity and portability of the tool, the convenience of installation, the reliability and clamping force of the optical fiber alignment device (which directly affects the attenuation of the connection), the adaptability to the environment, the availability of consumables and the stability of long-term use. Mechanical fiber splicing technology itself is not a new technology. As early as 20 years ago, the product was born. It is a mature optical fiber splicing technology, which has many applications in data and image transmission in the United States and Japan. Optical fiber mechanical connection technology has been used in engineering practice such as line emergency repair and small-scale application in special occasions since 1990 in China. In recent years, with the large-scale deployment of FTTH in the world, especially in Japan and the United States, people have more realized the significance of mechanical optical fiber splicing as an important means of optical fiber splicing in the final 100 meter deployment of FTTH. Fiber to the Home (FTTH) is deployed in the user premises and indoor optical fiber connection points, which has the characteristics of large number of users and scattered locations. Because the installation time of different users is different, the same community or building needs to be installed many times, similar to ADSL service. When the scale of users reaches a certain level, it is impossible for the existing construction workers and welding machines to meet the time requirements for users to open services. Mechanical optical fiber splicing has the advantages of simple operation, short training period and less tool investment, which provides the most cost-effective optical fiber splicing solution for large-scale optical fiber deployment. Mechanical optical fiber connection provides a convenient, practical, fast and high-performance optical fiber connection means for designers, constructors and maintenance personnel in the case of high corridor, narrow space, insufficient lighting and inconvenient on-site electricity use. Theoretically, in FTTH project, mechanical fiber splicing should be considered when connecting a large number of incoming optical cables scattered like capillaries from optical splitter to users. Its mechanical optical fiber splicing technology is at the leading level in the world, with optical fiber matching solution and patented V-groove with closed design as the core technology. With simple tools, it only takes 30 seconds to splice fixed optical fibers with loss less than 0. 1dB。 It can be applied to various combinations of 250um and 900um optical fibers, and can be used for single-mode optical fibers and multimode optical fibers. Its structure and continuation mechanism are shown in the following figure. Fig. 1, structure of Fi brl ok II mechanical optical fiber connector fig. 2, dimensions of Fi brl okII mechanical optical fiber connector fig. 3, sectional view of Fi brl ok II mechanical optical fiber connector fig. 4, schematic diagram of connection process of Fi brl okII mechanical optical fiber connector: optical fiber stripping, cleaning, end face cutting, alignment and crimping. Term refers to the average insertion loss.