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Integrated mageneto-optical modulator with optical isolator, method of mfg same and optical communication system using same

A magneto-optical modulator and optical isolator technology, applied in the field of optical communication systems, can solve the problems that the optical isolator cannot effectively block feedback light, cannot achieve broadband communication, and high-frequency magnetic fields cannot effectively apply magneto-optical components.

Inactive Publication Date: 2004-03-24
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, there is also a problem that when a high-frequency magnetic field is applied to the outside of the optical isolator, the high-frequency magnetic field used for modulation cannot be effectively applied to the magneto-optical element due to the influence of eddy currents.
[0012] There is also a problem that when a magneto-optical modulator and an optical isolator using a magnetostatic wave are composed of a single element (JP2001-272639A), since the magnetostatic wave can only be excited by a narrow frequency bandwidth, broadband communication like optical communication cannot be realized
In the same situation, there is another problem, that is, the optical isolator cannot effectively block the reflected feedback light, and when the modulation depth in the optical modulator becomes larger, more reflected feedback light will return toward the light source.

Method used

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  • Integrated mageneto-optical modulator with optical isolator, method of mfg same and optical communication system using same
  • Integrated mageneto-optical modulator with optical isolator, method of mfg same and optical communication system using same
  • Integrated mageneto-optical modulator with optical isolator, method of mfg same and optical communication system using same

Examples

Experimental program
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no. 1 example

[0033] The following will refer to figure 1 and 2 describe the first embodiment of the present invention. figure 1 is a partial cross-sectional view of the entire integrated magneto-optic modulator with optical isolator of the present invention. exist figure 1 Among them, 2 is a polarizer, 4 is a magneto-optical element, 6 is a polarizer and an analyzer, 7 is a magnet, 8 is a magneto-optical element, 9 is a magnet, 10 is an analyzer, and 70 is a housing. figure 1 A top cross-sectional view of an integrated magneto-optical modulator with an optical isolator is shown. 2 is a perspective view of a main part including an optical isolator unit and a magneto-optical modulator unit of a first embodiment of an integrated magneto-optical modulator with an optical isolator. In FIG. 2 , 2 is a polarizer, 4 is a magneto-optical element, 6 is a polarizer and an analyzer, 8 is a magneto-optic element, 10 is an analyzer, and 128 is an impedance adjuster.

[0034] Referring to Figure ...

no. 2 example

[0043] Next, referring to Fig. 3, a second embodiment of the present invention will be described. 3 is a perspective view of a main part including an optical isolator unit and a magneto-optical modulator unit of a second embodiment of an integrated magneto-optical modulator with an optical isolator. In Fig. 3, 2 is a polarizer, 4 is a magneto-optical element, 6 is a polarizer and an analyzer, 8 is a magneto-optical element, 10 is an analyzer, 13 is a strip line, 129 is a terminal load (impedance adjustment device).

[0044] The first and second embodiments mainly differ in the direction of the applied bias magnetic field and the high-frequency field generator for applying the high-frequency magnetic field. And here, in order to shorten the optical path length of the whole element (the length from the incident part of the incident light Pin to the exit part of the radiated light Pout), the polarizer 2, the polarizer and the analyzer 6, and the analyzer 10 adopt a thin glass po...

no. 3 example

[0049] Next, refer to Figures 4A-4E , to describe the third embodiment of the present invention. Figures 4A-4E The schematic diagrams of the first to fifth steps of the manufacturing method of the integrated magneto-optical modulator with the optical isolator including the optical isolator and the magneto-optical modulator on the same substrate are respectively described. exist Figure 4A Among them, 20 is a non-magnetic garnet substrate; in Figure 4B Among them, 5 is the growth magneto-optical element, 20 is the non-magnetic garnet substrate; in Figure 4C Among them, 4 is a magneto-optical element for forming a strip line and a small piece, 8 is a magneto-optical element, 20 is a non-magnetic garnet substrate, and 120 is a groove; Figure 4D Among them, 2 is a polarizer, 6 is a polarizer and an analyzer, and 10 is an analyzer; in Figure 4E Among them, 2 is a polarizer, 6 is a polarizer and analyzer, 10 is an analyzer, and 13 is a stripline.

[0050] First, if Figu...

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Abstract

The integrated magneto-optical modulator with optical isolator of the present invention comprises an optical isolator unit, a magneto-optical modulator unit, and an impedance adjuster. The optical isolator unit rotates a polarization of an incident light (Pin) from a light source to transmit the light with rotated polarization, and eliminates a reflected feedback light toward the light source. The magneto-optical modulator unit modulates an intensity of the light from the optical isolator unit and transmits the modulated light outside (Pout). The impedance adjuster adjusts electrical impedance at the magneto-optical modulator unit in order to effectively introduce the high-frequency signal for light modulation to the magneto-optical modulator unit. Further, the optical isolator unit and the magneto-optical modulator unit are contained in a single package.

Description

technical field [0001] The present invention relates to an integrated magneto-optical modulator with an optical isolator that integrates an optical isolator for optical communication and an optical modulator that uses magneto-optic effect to modulate light, and the manufacturing method and use of the modulator The modulator for optical communication systems. Background technique [0002] Magneto-optical modulators (such as Pockels cells) have been widely used in traditional optical communication systems. In particular, using LiNbO 2 A waveguide light modulator based on the photoelectric effect of crystals is a typical example (see Nishihara et al., Optical Integrated Circuits, pp. 298-304, 1985, Ohm-sha). However, an optical modulator using a photoelectric crystal has a disadvantage that it suffers from DC drift (J-Appl.Phys, Vol. 76, No. 3, pp. 1405-1408, 1994) and light attenuation, so it is difficult to operate stably for a long time , or cost a lot to avoid deteriorat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/00G02F1/09
CPCG02F1/092G02F1/0036G02F1/093G02F2201/122
Inventor 峰本尚
Owner PANASONIC CORP