Manufacturing method of polarization-independent optical isolator, bonding technology and solution of optical components

Abstract

The invention provides a manufacturing method of a polarization-independent optical isolator. The manufacturing method comprises the following steps of: cutting a first birefringent crystal flat plate, a polarization rotating crystal flat plate and a second birefringent crystal flat plate into the plates with the same light-penetration size; bonding the plates into a composite crystal flat plate with the large light-penetration size in an oxy-hydrogen catalytic bonding technology and then cutting the composite crystal flat plate into long strips; grinding and polishing wedge-angle planes; plating an anti-reflection film for increasing air permeability; cutting into an integrated bonded isolator core according to the actual usage size; and finally, assembling into a complete polarization-independent optical fiber online isolator. According to the manufacturing method of polarization-independent optical isolator, a bonding technology and a solution of optical components provided by the invention, various discrete optical components of the isolator core do not need to be manufactured independently, an optical path without glue is guaranteed, no air gap exists among the optical components, and a problem of difficultly treating parallelism in assembling of the discrete optical components is solved; the relative loss of the polarization is reduced, the application range and the service life of the isolator core are improved, the production cost is reduced by a large margin and the production efficiency is improved.

Description

【Technical field】 [0001] The invention relates to a manufacturing method of a polarization-independent optical isolator, an optical part bonding process and a bonding solution. 【Background technique】 [0002] In the optical communication system, the signal light will pass through many different optical interfaces during transmission, and it will reflect to different degrees when it passes through each optical interface, and the return light generated by the reflection may return to the light source along the original optical path, which is bound to It causes unstable operation of the light source, frequency drift, signal attenuation changes and other problems, thus affecting the normal operation of the entire optical communication system. In order to avoid the impact of the return light on the light source and other components, the return light must be suppressed by an optical isolator to ensure the working quality of the optical communication system. The optical isolator i...

AI Technical Summary

Problems solved by technology

The first disadvantage is that in the actual manufacturing process of the isolator core 2', it is necessary to manufacture the precise isolator core optical components 201', 202', 203' respectively, and then rely on the jig and spend a lot of man-hours in a certain process. Adjust the relative position of each optical component of the isolator core and fix it with glue on the side

Using this method to produce and assemble the optical isolator core 2', not only the manufacturing process is complicated, it takes a long time to work, but also the yield is not high, and the reliability is not good

The second disadvantage is that in the forward transmission direction of the optical signal, because there is a certain air gap between the optical components of the isolator core 2', the beam walk-off of the O light and the E light is increased, and the O light is increased. and the spacing between the E light, which brings about the polarization-dependent loss due to the beam separation of the O light and the E light

Although this method can glue the discrete optical parts into a whole, avoiding the disadvantages of the isolator core assembled from the discrete optical components, but because of the method of glue bonding, there is glue on the light-transmitting surface, which limits its scope of use and service life

In addition, because the glued isolator core is processed from long strips, glued and then cut into small pieces, it still cannot meet the needs of mass production. In terms of production efficiency, the saving of man-hours is not obvious

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