Light isolator

Abstract

A light isolator is composed of a first optical fibre collimator, an isolating center, a second optical fibre colliamtor with a longer sleeve tube, and an external packing sleeve tube. The isolating center conssits of two polarizers, a polarizing rotary crystal and a magnetic ring whose length is slightly less than or equal to the total length of the said polarizers and rotary crystal. The isolating center is in the sleeve tube of the second colliamtor and the magnetic ring is stuck to the sleeve tube.

Description

【Technical field】 [0001] The present invention relates to an optical combination, in particular to an optical isolator with low insertion loss, small size, compact structure and less susceptible to external environment changes. 【Background technique】 [0002] In the optical communication system, the signal light will pass through many different optical interfaces during transmission, and each optical interface will have different degrees of reflection, and the return light generated by the reflection will return to the light source along the original optical path. When the return light intensity reaches a certain level, it will cause instability of the light source, frequency drift, amplitude change and other problems, thus affecting the normal operation of the entire 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 communi...

AI Technical Summary

Problems solved by technology

[0006] However, since the magnetic ring 34 of the optical isolation center 30 is inserted into the lens end 131 due to the adhesive bonding, there will be a problem of glue overflow, thereby polluting the exit surface of the lens 13 and the adjacent polarizer surface. , and the pollution is difficult to remove, which will destroy the transmittance of the exit surface of the lens 13, and even reduce its exit area, thereby increasing the insertion loss of the entire optical isolator

Simultaneously because this optical fiber collimating device 10 is fixedly connected with the isolation center 30, the flexibility of adjusting beam alignment is greatly reduced, and the size requirements of the required polarizers 31, 33, polarization rotator crystal 32 and magnetic ring 34 are also limited. Larger, not conducive to the stack integration of multi-level optical isolators, the required manufacturing cost is also high, and it does not adapt to the development trend of the entire industry

Not only that, because the optical isolation center 30 is located outside the sleeve 12, it is easily affected by the humidity and temperature of the external environment, and the first polarizer 31, the polarization rotation crystal 32 and the second polarizer 33 are pre-installed on the magnetic In the ring 34, if the inside of the magnetic ring 34 is contaminated before assembly, it is not easy to clean

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