Over the years, fiber tolerances have greatly improved along with the mechanical tolerances of precision parts of the fiber optical connector. Early connectors suffered from poor alignment tolerances and mechanical stability problems due to loose fiber tolerances and mechanical tolerances of the connector design. The body and mating adapter also provide a key function, allowing the connector to mate in only one rotational position. This, combined with the tight tolerances of today’s optical fiber, ensures compliance with the Telcordia GR326 generic requirements repeatability standard of less than 2 dB connection loss over 500 mating cycles for single-mode fibers. Another critical component is the mating adapter, and its internal sleeve that aligns the two mating ferrules. Like the ferrule, sleeves are most often made from ceramic and can be either a split or solid construction. The alignment sleeve must precisely align the two precision ferrules by means of the ferrules outside diameters. This alignment must be done while providing a low-friction fit over a wide temperature range. At present, most lensed fiber optical connectors work by expanding the beam, exiting one fiber, then collimating the beam to the adjacent plug where a second lens is used to collect that light and re-direct it to the core of the second fiber. The main advantage of this approach is that the connector is less sensitive to alignment tolerances, so attenuation will remain more constant in the presence of vibration or temperature cycling. In addition, the large area of the beam minimizes the impact of contaminants. All in all, fiber optical connector is an important components used in the fiber optic network. It is also the key part used in fiber optic patch cord and fiber optic pigtail. There are many kinds of fiber optical connectors available in the market. Depending upon your fiber optic system, you can choose the most suitable and efficient one to construct and even optimize your system.