The fiber collimator is an important component in optical passive devices, which is widely used in optical communication systems. It is composed of a single-mode pigtail fiber as well as a collimating lens, and it has the characteristics of low insertion loss, high return loss, long working distance, wide bandwidth, high stability, high reliability, small beam divergence angle, small size as well as light weight. What's more, the fiber collimator can transform the divergent beam emitted from the end face of the fiber into a parallel beam, or converge and couple the parallel beam into the fiber with high efficiency, which is a basic device for making a variety of optical devices, therefore, it is widely used in beam collimation, beam coupling, optical isolator, optical attenuator, optical switch, circulator, MEMS as well as dense wavelength division multiplexer ES.
The basic principle of optical fiber collimator is to place the fiber end face at the focal point of the collimating lens to collimate the beam, and then slightly adjust the position of the fiber end face near the focal point to obtain the required working distance, so the working distance of the collimator is related to the distance L between the fiber head and the lens. The design method of the fiber collimator is to determine the working distance of the collimator according to actual requirements, determine the distance L between the fiber head and the lens to calculate the spot size according to the Gaussian beam transmission theory, and then calculate the point accuracy of the collimator according to the light theory.
Low insertion loss, high return loss, small size, long working distance, wide bandwidth, high stability, and high reliability.