Magneto-optic optical parts
An optical component and magneto-optical technology, applied in optics, nonlinear optics, instruments, etc., can solve the problems of increasing electromagnet 115, difficulty in miniaturization, low power consumption, etc.
Inactive Publication Date: 2004-03-24
TDK CORPARATION
View PDF3 Cites 2 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0015] However, in the method of applying a magnetic field disclosed in Patent Document 1, in order to rotate the magnetization similarly when a magnetic field in the vertical direction generated by the permanent magnet 114 is applied, it is necessary to strengthen the force in the in-plane direction applied by the electromagnet 115. The magnetic field requires increasing the size of the electromagnet 115 or passing a large current, making it difficult to miniaturize and reduce power consumption.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0041] Refer below Figure 1 to Figure 12 A magneto-optical optical component according to an embodiment of the present invention will be described. First, refer to Figure 1 to Figure 3 The principle of operation of the magneto-optical optical component of this embodiment will be described. Figure 1 to Figure 3 The state in which the magnetic field is applied by changing various conditions of the Faraday rotator (magneto-optical crystal) is shown. figure 1 (A), Figure 2(A) and image 3 (A) shows a state in which the direction perpendicular to the light entrance and exit plane of the Faraday rotator 20 is seen. The area enclosed by the circle approximately at the center of the Faraday rotator 20 is the light transmission area C. For example, linearly polarized light that enters from the front of the paper to the back of the paper enters the light transmission region C of the Faraday rotator 20 , rotates the polarization azimuth by a predetermined angle, and exits toward ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
There is provided a magneto-optic optical device, such as a variable optical attenuator, an optical modulator or an optical switch, which is small, has a low power consumption, and has a high speed. A magnetic field in the same direction as the traveling direction of a light beam is applied vertically to a light entrance / exit plane of a Faraday rotator by a permanent magnet, and a light transmission region is completely contained in, for example, a region of a magnetic domain A, and emits a light beam without attenuation. When power is applied to an electromagnet to cause a region of the magnetic domain A and a region of a magnetic domain B to substantially equally exist in the light transmission region, a Faraday rotation angle thetaf becomes 0 DEG . When a further large current is made to flow to the electromagnet, the light transmission region is completely contained in the region of the magnetic domain B. The Faraday rotation angle at the time when the light transmission region is in the region of the magnetic domain B becomes -thetafs. As the Faraday rotation angle is changed from 0 DEG to -thetafs, the intensity of light absorbed by a second polarizer is increased, and excellent attenuation is realized.
Description
technical field [0001] The invention relates to a variable optical attenuator and an optical modulator used in an optical communication system, or a magneto-optical optical component such as an optical switch. Background technique [0002] As a variable optical attenuator, a so-called magneto-optical variable optical attenuator is known that controls the amount of light attenuation by changing the Faraday rotation angle generated by the strength of an applied magnetic field. The magneto-optical variable optical attenuator has improved reliability because there are no mechanical moving parts, and has the advantage of being easy to miniaturize. The magneto-optical variable optical attenuator has a magneto-optic crystal and an electromagnet that applies a magnetic field to the magneto-optic crystal. By changing the amount of current flowing through the electromagnet and controlling the strength of the magnetic field applied on the magneto-optical crystal, the strength of the m...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): G02F1/09
CPCG02F1/09
Inventor 岩信治
Owner TDK CORPARATION