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optical transmitter

A technology of optical transmitters and light beams, which is applied in the coupling of electromagnetic transmitters and optical waveguides, and can solve the problems of increased equipment size and structural complexity

Active Publication Date: 2017-04-12
FUJITSU OPTICAL COMPONENTS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, the structure in which the prism is additionally provided leads to an increase in the number of parts by as much as the prism, which may result in an increase in the complexity of the structure and the size of the device

Method used

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Embodiment Construction

[0020] Preferred embodiments of the present invention will be described with reference to the accompanying drawings. It should be noted that the technology disclosed herein will not be limited by this embodiment.

[0021] refer to figure 1 and figure 2 , the technology on which the optical transmitter according to the first embodiment depends will be described first. figure 1 is a diagram showing an example of the shape of a signal beam emitted from an optical waveguide toward an optical fiber. exist figure 1 , it is assumed that the x-axis is defined along the longitudinal direction of the substrate 113 ; the y-axis is defined along the width direction of the substrate 113 ; and the z-axis is defined along the thickness direction of the substrate 113 .

[0022] like figure 1 As shown, an optical transmitter having a semiconductor optical modulator is configured such that when a signal beam is emitted from an optical waveguide 116 on a substrate 113 toward an optical fib...

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Abstract

A first lens transmits a beam of light having a vertical cross-sectional diameter made closer to a horizontal cross-sectional diameter. The beam of light is emitted from an optical waveguide on a substrate and configured such that the vertical cross-sectional diameter which is the diameter of a vertical cross section along the direction of the thickness of the substrate is greater than the horizontal cross-sectional diameter which is the diameter of a horizontal cross section along the direction of the width of the substrate. A second lens is disposed at a position, at which the vertical cross-sectional diameter and the horizontal cross-sectional diameter coincide with each other, so as to focus the beam of light on the optical fiber. The position is closer to the optical fiber than the first lens along the direction of travel of the beam of light transmitted by the first lens.

Description

technical field [0001] Embodiments discussed herein relate to optical transmitters. Background technique [0002] Recently, in optical communication systems, for example, optical modulators using semiconductors such as indium phosphide (InP) (hereinafter referred to as "semiconductor optical modulators") are being developed instead of using lithium niobate (LiNbO 3 ) light modulator (hereinafter referred to as "LN light modulator"). Compared with LN modulators, semiconductor modulators can achieve higher efficiency of applied electric field, thereby facilitating the reduction of driving voltage and size. That is, the semiconductor light modulator can be more easily reduced in size than the LN light modulator. [0003] However, semiconductor waveguides and lithium niobate (LiNbO 3 ) waveguide confines light at a higher level, the waveguide mode distribution is significantly lower. Therefore, when the signal beam output from the semiconductor optical modulator is emitted f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/42H04B10/50
CPCG02B6/32G02B6/30G02B6/34
Inventor 丸山真示佐佐木诚美柴田康平久保辉洋竹内信太郎加藤大织田中刚人
Owner FUJITSU OPTICAL COMPONENTS LTD