JPS62148918A - Optical isolator device - Google Patents

Abstract

PURPOSE:To control efficiently coupling between a polarizer and an analyzer by using V grooves for 45 deg. rotation formed on inside faces of a polarizer fixing device and an analyzer fixing device to set the angle of polarization and the optical axis of the polarizer and the analyzer. CONSTITUTION:A rotator 10 is inserted and fixed to a Farady rotator fixing device 11, and a permanent magnet 12 is inserted to the rotator 10. A polarizer 4 is inserted to a polarizer fixing device 2 through a pair of V grooves 6 for 45 rotation. At this time, an Si rubber elastic adhesive is filled in remainder V grooves 6 to fix the polarizer 4 by the whole of the side face. Next, an analyzer 5 is rotated at 45 deg. with respect to the optical axis and is inserted and fixed to an analyzer fixing device 3. V grooves 7 for 45 deg. rotation used at this time are rotated at 45 deg. with respect to V grooves 6 to which the polarizer 4 is inserted. By this method, it is unnecessary to adjust the angle of polarization and the optical axis, and the angle of polarization and the optical axis are set easily. The polarizer and the analyzer are fixed easily with remainder V grooves.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an optical isolator device used for the purpose of removing returning light to a semiconductor laser, and in particular to adjusting the polarization angle between a polarizer and an analyzer and adjusting the optical axis. It's about coordination.

BACKGROUND OF THE INVENTION Recently, optical communication systems and optical application equipment using semiconductor lasers as light sources have been used in various fields, and various optical isolator devices have been proposed to remove light returning to the semiconductor lasers. ing. Optical isolator devices generally consist of three parts: a polarizer, a F/75″ F-rotator, and an analyzer. Conventionally, the adjustment of the polarization angle J3J between the polarizer and analyzer and the optical axis was , after fixing the polarizer, detect the optimal position by rotating the analyzer η
A method was adopted.

Problems to be Solved by the Invention However, in the adjustment method J3 as described above, a considerable amount of 0.00% is required to adjust the polarization angle and the optical axis. ), resulting in the problem of low productivity of optical isolator radicals.

The present invention solves the above problems, and when using a Faraday rotator with a Faraday rotation angle of 45 degrees, the
By aligning the central axes of the polarizer and analyzer in the optical axis direction using the processing precision of the V-groove for 5-degree rotation, and by predefining the polarization angle to 45 degrees, the extinction ratio can be maintained without reducing the extinction ratio. It is an object of the present invention to provide an optical isolator device that can simultaneously set the polarization angle and optical axis of a polarizer and analyzer, and can also easily fix them.

Means for solving the problem In order to solve this problem, the present invention provides a polarizer fixed VC
45 extending in the optical axis direction on the inner surface of the analyzer fixing device and the analyzer fixing device.
A V-groove for degree rotation is provided, and this V-groove can be used to set the polarization angle and optical axis of the polarizer and analyzer, and the remaining V-groove after setting is used to fill it with adhesive. By doing so, it was also used to fix the polarizer and analyzer.

Effect With the above configuration, the polarizer fixing device and the analyzer fixing Ve
By using the V-groove for 45-degree rotation formed on the inner surface of the stomach, the polarization angle and optical axis settings of the polarizer and analyzer can be set at the same time, and the connection between the polarizer and analyzer can be made for a short time. It is possible to control til+-'J quickly and efficiently, and they can also be easily fixed using the remaining V-groove after setting.

EXAMPLE An example of the present invention will be described below based on the drawings. FIG. 1 is a sectional view of an optical isolator device according to an embodiment of the present invention, and FIG. 2 is a perspective view showing a portion of the polarizer fixing device.

In FIG. 1, 1 is a protective case, 2J3 and 3 are a polarizer fixing device and an analyzer fixing device into which the polarizer 4 and analyzer 5 are inserted and fixed, and the polarizer, Jζ and analyzer 5 are attached to the inner surface of the device. V grooves 6 and 7 for 45 degree rotation are provided parallel to the optical axis Δ so as to be able to rotate by 45 degrees with respect to the axis. 8
．． Reference numeral 9 denotes a ring-shaped aberration installed inside the polarizer fixing device 2 and the analyzer fixing device 3 to stop the transmitted light from the V-grooves 6 and 7. 10 is a Faraday rotator with a Faraday rotation angle of 45 degrees, and YrG
The crystals are arranged in eight columns with respect to the optical axis A, and the peripheral portion is fixed by a Faraday rotator fixing device 11. A permanent magnet 12 is arranged around the Faraday rotator fixing device 11 and is made of a samarium cobalt magnet. The protective case 1, the polarizer fixing device 2, the analyzer fixing device 3, the apertures 8 and 9, and the Faraday rotator fixing device 11 are made of brass, and all of their surfaces are blackened to prevent reflection. Furthermore, solder fixation using a YAG laser is used to fix the protective case 1 and each component.

Next, the V-groove for 45 degree rotation will be explained in more detail with reference to FIG. Although FIG. 2 only shows the polarizer fixing device 2, the same applies to the analyzer fixing device.

In FIG. 2, eight V-grooves 6 for 45-degree rotation are provided at intervals of 45 degrees, and their lengths coincide with the optical axis direction. When the rectangular polarizer 4 is set using one set of 45 degree rotation V grooves 6, the remaining 45 degree rotation V grooves 6 (
In the figure, the shaded area) is used as a groove for filling adhesive for fixing the polarizer 4 to the fixture @2.

Next, its effect will be explained. First, the Faraday rotator 10 that exhibits the 7 Alladay effect is inserted and fixed into the Faraday rotator fixing device 11, then inserted into the permanent magnet 12 that applies saturation magnetization to the Faraday rotator 10, and fixed inside the protective case 1. Subsequently, the polarizer 4 is inserted into the polarizer fixing bag @2 via a set of V grooves 6 for 45 degree rotation. At this time, if the remaining V-groove 6 is filled with a silicone rubber adhesive having elasticity, the polarizer 4 is fixed on the entire side surface. Next, the analyzer 5 is rotated by 45 degrees with respect to the optical axis in order to match the Faraday rotation angle, and is inserted and fixed into the analyzer fixing device @3 in the same way as the polarizer 4 is fixed. At this time, the V groove 7 for 45 degree rotation is 45 degrees with respect to the V groove 6 into which the polarizer 4 is inserted.
゛Use a rotated one. According to this method, there is no need to adjust the polarization angle and optical axis as in the past, and the polarization angle and optical axis can be easily set, resulting in extremely high productivity and the use of the remaining V-groove. Thus, an optical isolator device 17 in which the polarizer 4 and analyzer 5 can be easily fixed is obtained.

In this example, a silicone rubber adhesive was used to fix the polarizer 4 and the analyzer 5, but the adhesive is not limited to this, and other adhesives may be used as long as they do not impair their elasticity against changes in anal temperature. It can also be from.

According to the present invention, by inserting the polarizer and analyzer into their respective fixing devices and fixing them in the protective case, it is possible to set the polarization angle between the polarizer and analyzer and This is an optical isolator device that can set and fix the optical axis, making it extremely productive and reliable.

can be obtained, and its practical effects are significant.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an optical isolator device according to an embodiment of the present invention, and FIG. 2 is a partial perspective view of the polarizer fixing device. 2... Polarizer fixing device, 3... Analyzer fixing device, 4
...Polarizer, 5...Analyzer, 6,7...Groove for 45 degree rotation, 8.9...Average core, 10...Faraday rotator, 11...Faraday rotator fixed intragastric Representative Morimoto Yoshihiro 1st figure 2 - duck light fixation 3 - set of lucid pupils 4 - polarized light - inspection L) 6.7 - - 4 Wolf times φλ old V true

Claims (1)

[Claims] 1. An optical isolator device comprising a polarizer, a Faraday rotator, and an analyzer, and having a polarizer fixing device and an analyzer fixing device into which the polarizer and analyzer are inserted and fixed, the polarizer fixing device and the analyzer A V-groove for 45-degree rotation extending in the optical axis direction is provided on the inner surface of the fixing device, and this V-groove is used to enable the polarization angle setting and optical axis setting of the polarizer and analyzer, and also allows the remaining V of
An optical isolator device in which the groove is filled with adhesive for fixing the polarizer and analyzer.