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Optical modulator and optical module using same

An optical modulator and optical modulation element technology, applied in the field of optical modules, can solve the problems of extinction ratio, optical output characteristics and reliability effects, characteristics changes of accelerated deterioration test characteristics and reliability decline, etc. The effect of suppressing changes in characteristics

Pending Publication Date: 2021-04-09
SUMITOMO OSAKA CEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, especially when an interference-type optical modulation element such as a Mach-Zehnder optical modulator is used as the optical modulation element 1502, an asymmetrical temperature distribution occurs between adjacent parallel waveguides on the substrate. The additional phase differences that are different from each other will also have an unfavorable influence on the characteristics and reliability of the light modulation element 1502 itself, such as the extinction ratio and light output characteristics.
That is, in an optical modulator using an interferometric optical modulation element, an asymmetrical temperature distribution that occurs over a long period of time due to the proximity to heat-generating electronic components is expected, and characteristic fluctuations that cannot be predicted in accelerated degradation tests, etc. and the drop in reliability will be particularly significant for the

Method used

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  • Optical modulator and optical module using same
  • Optical modulator and optical module using same
  • Optical modulator and optical module using same

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Experimental program
Comparison scheme
Effect test

no. 1 approach

[0063] figure 1 It is a plan view showing the structure of the light modulator 100 according to the first embodiment of the present invention, figure 2 is a side view of the light modulator 100, image 3 Yes figure 1 The AA cross-sectional view of the light modulator 100 is shown.

[0064] The light modulator 100 includes a light modulation element 102 , a modulator case 104 that accommodates the light modulation element 102 , an input optical fiber 108 that inputs light to the light modulation element 102 , and an input fiber 108 that transmits light output from the light modulation element 102 to the modulator case 104 . Externally guided output fiber 110.

[0065] It should be noted that since the modulator case 104 is hermetically sealed, the interior of the modulator case 104 cannot actually be observed, but in figure 1 In the figure, in order to facilitate understanding of the structure inside the modulator case 104 , the components inside the modulator case 104 ...

no. 2 approach

[0097] Next, a second embodiment of the present invention will be described. Figure 4 It is a plan view showing the configuration of the light modulator 400 according to the second embodiment. and, Figure 5 Yes Figure 4 The BB cross-sectional view of the light modulator 400 is shown. exist Figure 4 and Figure 5 , for and figure 1 and image 3 In the light modulator 100 of the first embodiment, the same components and wall thicknesses as figure 1 and image 3 The reference numerals in the same reference numerals refer to the above-mentioned description of the light modulator 100 . Also, the side appearance of the light modulator 400 is the same as figure 2 The side appearance of the light modulator 100 shown is the same. Moreover, in Figure 4 , in order to facilitate the understanding of the structure of the light modulator 400, and figure 1 Likewise, the internal structures that cannot be observed in the assembled state are also indicated by solid lines. ...

no. 3 approach

[0104] Next, a third embodiment of the present invention will be described. Image 6 It is a plan view showing the configuration of the light modulator 600 according to the third embodiment. and, Figure 7 Yes Image 6 The CC cross-sectional view of the light modulator 600 is shown. exist Image 6 and Figure 7 , about and figure 1 , figure 2 , image 3 , Figure 4 and Figure 5 In the light modulators 100 and 400 of the first and second embodiments, the same components and wall thicknesses are used, and the same figure 1 , figure 2 , image 3 , Figure 4 and Figure 5 The reference numerals in the same reference numerals refer to the description of the above-mentioned light modulators 100 and 400 . Also, the side appearance of the light modulator 600 is the same as figure 2 The side appearance of the light modulator 100 shown is the same. Moreover, in Image 6 , in order to facilitate the understanding of the structure of the light modulator 600, the sam...

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Abstract

The present invention suppresses fluctuations in characteristics and the deterioration of the long-term reliability of an optical module that result from a heat source being disposed near the optical module. The present invention is provided with an optical modulation element constituted by an optical waveguide, and a housing that stores the optical modulation element. The housing includes: a bottom wall that has a quadrilateral shape in plan view; a first long-side wall and a second long-side wall that are connected to two mutually opposite sides of the bottom wall; and a first short-side wall and a second short-side wall that are connected to the other two mutually opposite sides of the bottom wall and that are shorter than the first and second long-side walls. The mean thickness of the second long-side wall is greater than or equal to the mean thickness of the first long-side wall. At least either the first short-side wall or the second short-side wall has a smaller thickness than the mean thickness of the first long-side wall. The optical modulation element is secured to a pedestal part provided on a portion of the bottom wall, and a high-heat resistance section is provided on a portion of the bottom wall other than the portion where the pedestal part is provided.

Description

technical field [0001] The present invention relates to an optical modulator and an optical module for performing an optical communication operation using the optical modulator. Background technique [0002] In recent years, the digital coherent transmission technology, which has been applied in long-distance optical communication, is gradually applied to urban optical communication such as medium-distance and short-distance due to the further increase of communication demand. In such digital coherent transmission, LiNbO is typically used as an optical modulator. 3 (hereinafter, referred to as LN) substrate DP-QPSK (Dual Polarization-Quadrature Phase Shift Keying) modulator. Below, LiNbO will be used 3 The light modulator of the substrate is called an LN modulator. [0003] Such an optical modulator is mounted and used in an optical module that performs an optical communication operation together with a circuit board provided with, for example, a driver IC (driver integra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/03G02F1/035
CPCG02F1/225G02F1/212G02F2202/20
Inventor 宫崎德一菅又彻
Owner SUMITOMO OSAKA CEMENT CO LTD