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Megneto-optical optical element

An optical component, magneto-optical technology, applied in optics, nonlinear optics, instruments, etc., can solve the problems of miniaturization and low cost of magneto-optical optical components

Inactive Publication Date: 2005-03-30
TDK CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it becomes more difficult to miniaturize and reduce the cost of magneto-optical optical components

Method used

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  • Megneto-optical optical element

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0077] use now figure 1 and figure 2 The magneto-optical optical component according to the first embodiment of the present invention will be described. figure 1 Showing the structure of the magneto-optical optical component 1 of the present embodiment, figure 2 The structure of main parts of the magneto-optical optical component 1 is shown. here, in figure 1 and figure 2 Among them, the advancing direction of the light beam projected in the plane parallel to the light incident surface of the magneto-optical crystal of the magneto-optical optical component 1 is set as the X axis, and the direction perpendicular to the X axis in the plane is set as the Y axis. . And the Z axis is selected as the direction perpendicular to the light incident and exit planes. figure 1 Represents the structure of the magneto-optical optical component 1 viewed along the -Y direction, figure 2 (a) shows the structure of the main part of the magneto-optical optical component 1 viewed a...

no. 2 Embodiment approach

[0089] Refer below Figure 3 to Figure 18 A magneto-optical optical component according to a second embodiment of the present invention will be described. First, problems that may occur in the magneto-optical optical component 1 of the first embodiment described above will be described.

[0090] image 3 and figure 2 Correspondingly, it represents the optical path of the transmitted light in the Faraday rotator 20 of the magneto-optical optical component 1 . exist image 3 neutralize figure 2 Differently, considering the beam diameter of the light, the figure shows the optical path L2 (solid line) on the central axis of the light beam as approximately parallel light, the optical path L1 (long dotted line) shifted from the optical path L2 to the -X direction, and the optical path L1 (long dotted line) from the optical path Optical path L3 (short dashed line) shifted from L2 to the +X direction. Such as image 3 As shown, in the magneto-optical optical component 1 of th...

Embodiment 2-1

[0105] Now, the magneto-optical optical component of Example 2-1 of the present embodiment will be described. Figure 9 The configuration of main parts of the polarization controller 2 of this embodiment is shown. exist Figure 9 in, with figure 1 and figure 2 Construct the coordinate system similarly. Such as Figure 9 As shown, the polarization control body 2 has a magnetic yoke 42 (in Figure 9 Only the ends 42a and 42b) and the electromagnet of the coil wound on the yoke 42 are shown. One end portion 42 a of the yoke 42 is disposed close to the back surface of the total reflection film 30 such that the top end surface 42 c faces the back surface of the total reflection film 30 . The other end portion 42 b of the yoke 42 is disposed close to the back surface of the total reflection film 31 such that the top end surface 42 d faces the back surface of the total reflection film 31 . The distal end surface 42c of the end portion 42a and the distal end surface 42d of th...

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Abstract

The invention provides small-sized, power-saving and easily-producible magneto-optical devices. The magneto-optical device comprises a Faraday rotator having nearly parallel surfaces and a Z-direction magnetic easy axis; a total reflection film formed partly on one surface of the Faraday rotator; another total reflection film formed partly on the other surface thereof; a light input region through which light enters the Faraday rotator; a light output region through which the light having alternately reflected on the total reflection films goes out of the Faraday rotator; a permanent magnet that forms a predetermined magnetic domain structure in the Faraday rotator and applies a magnetic field component in the Z-direction to the Faraday rotator so that the magnetization direction could be the same both in the light input region and the light output region; and an electromagnet that varies the position at which the magnetic field component applied to the Faraday rotator is 0 (zero).

Description

technical field [0001] The present invention relates to magneto-optical optical components, in particular to magneto-optical optical components such as polarization controllers or light modulators, variable optical attenuators, optical isolators, and optical circulators. Background technique [0002] In high-speed optical communication with a transmission rate of 40 Gbps, polarization mode dispersion becomes one of the main factors of transmission degradation. For this reason, research on a polarization mode dispersion (PMD) compensator for compensating the influence of polarization mode dispersion has been actively carried out in recent years. As one of the main components of the PMD compensator, there is a polarization controller that controls the polarization state of light. As disclosed in Non-Patent Document 1, lithium niobate (LN) or liquid crystals, optical fiber squeakers, variable Faraday rotators, and the like are known as optical devices constituting the polariza...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/01G02F1/09
CPCG02F2201/34G02F2201/17G02F1/092
Inventor 岩塚信治
Owner TDK CORP
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