Broad spectrum optical fiber collimator

Abstract

The invention discloses a broad spectrum optical fiber collimator. The broad spectrum optical fiber collimator comprises a thermal-expanding core optical fiber head, an achromatic lens and an outer sleeve, wherein the thermal-expanding core optical fiber head and the achromatic lens are arranged in the outer sleeve in a straight line, and an air layer is arranged between the thermal-expanding core optical fiber head and the achromatic lens, the thermal-expanding core optical fiber head and the achromatic lens have the same optical axis, and the outer sleeve is provided with a fixed central axis; the broad spectrum optical fiber collimator has the characteristics that a rear end face of the achromatic lens is vertical to the outer sleeve, the distance between the rear end face of the achromatic lens and a front end face of the thermal-expanding core optical fiber head is the thickness of the air layer in the middle, and is equal to the difference of an effective focus length of the achromatic lens and the distance between the rear end face of the achromatic lens and a primary side of the achromatic lens. Compared with the traditional collimator, the broad spectrum optical fiber collimator provided by the invention greatly reduces the insertion loss of an incident light beam; the core diameter of the thermal-expanding core optical fiber head is magnified by 3-5 times; an emergent light beam has a large spot diameter, and a small emergent aperture angle; and the chromatic dispersion caused by the broad spectrum is eliminated, the system transmission performance is improved, and the alignment error is low.

Description

technical field [0001] The invention relates to a wide-spectrum optical fiber collimator with achromatic function for collimating and enlarging the diameter of the optical fiber transmission beam. The collimator is mainly used in the field of optical communication and optoelectronic technology for wide spectrum signal coupling connection between optical fibers, optical fibers and waveguides, and other chips. Background technique [0002] Fiber collimator is a passive device widely used in optical fiber communication and other systems. Its main function is to turn the outgoing beam into a parallel beam, or to converge the parallel beam into the optical fiber. A conventional collimator structure consists of a fiber optic head and a collimating lens. At present, there are mainly three kinds of collimating lenses: self-focusing lens, C lens and ball lens. [0003] The use of this type of collimator reduces the connection loss between optical fiber and optical fiber and optical...

AI Technical Summary

Problems solved by technology

The spectral width of the propagating signal will inevitably lead to the dispersion loss in the propagation process, which will cause the optical pulse distortion of the digital optical fiber communication system and distort the transmitted signal

[0006] During the use of traditional fiber collimators, the exit spot, aperture angle and insertion loss have not been well improved

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