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Optical modulation element and communication system

A technology of light modulation components and modulation electrodes, which is applied in the direction of electrical components, transmission systems, electromagnetic wave transmission systems, etc.

Inactive Publication Date: 2004-01-14
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0018] In the future, in order to widely use optical modulation elements in optical communication systems, etc., there is still room for improvement in the characteristics of the above-mentioned conventional optical modulation elements

Method used

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  • Optical modulation element and communication system
  • Optical modulation element and communication system
  • Optical modulation element and communication system

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Embodiment 1

[0070] Next, Embodiment 1 of the light modulation element of the present invention will be described with reference to FIGS. 4( a ) to 4 ( c ). Fig. 4(a) shows the planar configuration of the optical modulation element of this embodiment, and Fig. 4(b) shows a cross section perpendicular to the waveguide. Fig. 4(c) schematically shows the electric field intensity distribution formed by the modulation electrode of the light modulation element.

[0071] As shown in FIG. 4( a ), the optical modulation element of this embodiment has an optical waveguide 12 formed on the surface of a substrate 11 having a photoelectric effect by proton exchange using benzoic acid or the like. The substrate 11 is made of, for example, lithium tantalate (LiTaO 3 ) single crystal or lithium niobate (LiNbO 3 ) materials such as single crystals are formed.

[0072] The optical waveguide 12 branches into two branch optical waveguides 12a, 12b at two branch points 18a, 18b. The input light input from ...

Embodiment 2

[0111] Below, refer to Figure 15 (a)-(c) illustrate Embodiment 2 of the light modulation element of the present invention. Figure 15 (a) shows the planar configuration of the light modulation element of this embodiment, Figure 15 (b) shows the region where the remnant polarization polarity of the substrate is reversed. Figure 15 (c) shows the electric field intensity distribution in the parallel coupled lines.

[0112] The light modulation element of this embodiment is such as Figure 15 As shown in (a), there is an optical waveguide 22 formed on the surface of a substrate 21 having a photoelectric effect by a proton exchange method using benzoic acid or the like. The substrate 21 is made of, for example, lithium tantalate (LiTaO 3 ) single crystal or lithium niobate (LiNbO 3 ) materials such as single crystals are formed.

[0113] The optical waveguide 22 is configured to branch into two branched optical waveguides 22a, 22b at two branching points 28a, 28b, and the ...

Embodiment 3

[0127] Below, refer to Figure 16 (a) and Figure 16 (b) Embodiment 3 of the light modulation element of the present invention will be described. Figure 16 (a) shows the planar configuration of the light modulation element of this embodiment, Figure 16 (b) is its longitudinal section.

[0128] The light modulation element of this embodiment is such as Figure 16 As shown in (a), with lithium tantalate (LiTaO 3 ) single crystal or lithium niobate (LiNbO 3 ) The optical waveguide 32 is formed by passing the surface portion of the substrate 31 having a photoelectric effect such as a single crystal through a proton exchange method using benzoic acid. The optical waveguide 32 is configured to branch into two branched optical waveguides 32a, 32b at two branching points 38a, 38b, and the input light input from the entrance side optical waveguide 32x is branched at the one-side branching point 38a, and passes through the two branching points. After the optical waveguides 32a a...

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Abstract

Provided is an optical modulator of high efficiency which can be mounted on an optical communication system and the like. The optical modulator is provided with an optical waveguide 12 at least a part of which is formed by using a material having an electrooptic effect, an modulation electrode 13 having first and second conductor lines 13a and 13b electromagnetically bonded to each other and applying a modulation electric field to the optical waveguide 12, a conductive layer 14 forming a first micro strip line together with the first conductor line 13a and a second micro strip line together with the second conductor line 13b, an electric signal inputting section 15 supplying a high frequency signal for optical modulation to the modulation electrode and connection members 16a and 16b interconnecting the first and the second conductor lines 13a and 13b at both ends. The first and the second conductor lines 13a and 13b function as a resonator of an odd mode of the high frequency signal.

Description

technical field [0001] The present invention relates to an optical modulation element and a communication system, in particular to an optical modulation element and a communication system which use light to transmit high-frequency signals above several GHz used in wireless. Background technique [0002] In systems that use optical signals for communication or information processing, it is necessary to modulate the phase or intensity of light with electrical signals (such as high-frequency signals such as microwaves or millimeter waves). In this light modulation method, there are direct modulation and external modulation. [0003] Direct modulation is as figure 1 As shown in (a), the intensity of the light output from the light source itself is modulated by directly modulating the current that drives the light source such as a semiconductor laser. Because direct modulation does not require a modulator outside the light source, it is suitable for system miniaturization, but ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/035G02F1/21G02F1/225
CPCG02F1/2255G02F1/0356G02F2001/212G02F1/212
Inventor 榎原晃小崎正浩矢岛浩义
Owner PANASONIC CORP
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