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Optical system including optical waveguide

An optical system and optical waveguide technology, applied in the field of optical systems, can solve the problems of reduced light propagation efficiency, optical waveguide light leakage, and insertion loss reduction, etc., to achieve the effect of ensuring light propagation efficiency, high light propagation efficiency, and large design freedom

Inactive Publication Date: 2008-08-06
RESONAC CORPORATION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the size of the optical multiplexer / demultiplexer is large, and when the size is reduced to meet the requirements of use, the transmission efficiency of light will be significantly reduced, and light leakage may occur between the optical waveguides
[0015] On the other hand, when grooves perpendicular to the optical axis are provided in the MMI portion as described in Patent Document 3 and thin-film optical devices are provided, the present inventors observed that the field of the light wave at the incident end does not converge properly at the exit end.
That is, in the case of configuring the multiplexer / demultiplexer as described in Patent Document 3, the light of the wavelength that should be emitted is caused by radiation loss at the outgoing end and the insertion loss is reduced, and the light of the wavelength that should not be emitted leaks into the optical waveguide to cause isolation. falling problem

Method used

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  • Optical system including optical waveguide
  • Optical system including optical waveguide
  • Optical system including optical waveguide

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no. 1 Embodiment approach

[0124] In an optical system including a conventional optical waveguide disclosed in Patent Document 3 or the like, the MMI portion has a constant width. In the first embodiment, the width of the MMI portion is different on both sides of the thin film optical device.

[0125] In the structure where the structure of the existing MMI is simply combined with the thin-film optical device, the reason for the phenomenon of performance degradation is that the groove part where the thin-film optical device is inserted differs from the adjacent MMI part in the vertical direction and relative to the core. There is no covering layer in the left and right directions, and the sealing effect of the light wave disappears. The resulting perturbation of the light wave field can be considered to affect the field shape of the convergent light at the exit end. Therefore, the first embodiment solves the problem by optimizing the structure to compensate the field of propagating light in the perturb...

no. 2 Embodiment approach

[0147] In the second embodiment, the width W of the MMI portion is different on both sides of the thin film optical device.

[0148] In addition, the positional relationship between the incident optical waveguide and the outgoing optical waveguide, which was conventionally symmetrical, is made asymmetrical with respect to the central axis of the MMI.

[0149] The configuration of the optical system 110 including the optical waveguide of the second embodiment is as follows figure 2 As shown, the same components as those of the optical system 10 including the optical waveguide of the first embodiment are given the same symbols and their descriptions are omitted.

[0150] In the optical system 110 including the optical waveguide according to the second embodiment, the width W in the direction perpendicular to the traveling direction of the light of the fourth and fifth multimode optical waveguides is equal, and the second and third light input / output members extend toward all 1...

no. 3 Embodiment approach

[0162] The configuration of the optical system 210 including the optical waveguide of the third embodiment is as follows image 3 As shown, the same components as those of the optical system 10 including the optical waveguide of the first embodiment are given the same symbols and their descriptions are omitted.

[0163] In the optical system 210 including the optical waveguide according to the third embodiment, the width W in the direction perpendicular to the traveling direction of the light of the fourth and fifth multimode optical waveguides is different, and the second and third light input / output means 1 / 2D of the centerline interval of the input and output positions of the fifth multimode optical waveguide 5 and the distance D between the center line of the input and output positions of the second and third optical input and output members to the fifth multimode optical waveguide and the central position of the input and output of the first optical input and output membe...

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Abstract

The invention provides an optical waveguide having an effect resulting from a size reduction such as an increase in the number of fetches, because it has no substantial rise in the manufacturing cost but can reduce the size, and an optical system including the optical waveguide. The optical system includes first, second and third optical input / output means (12, 14 and 16), fourth and fifth multimode optical waveguides (20 and 22) capable of transmitting a light in multiple modes, and optical filter mounting means (26) for mounting an optical filter (24) between the fourth and fifth multimode optical waveguides (20 and 22) in a direction to intersect the traveling direction of the light in the fourth and fifth multimode optical waveguides. The optical system is characterized in that the fourth and fifth multimode optical waveguides (20 and 22) have different widths in a direction perpendicular to the light traveling direction.

Description

technical field [0001] The present invention relates to an optical system including an optical waveguide, and more particularly to an optical system including a so-called multi-mode interference (MMI: Multi-Mode Interference) optical waveguide. Background technique [0002] With the recent development of multimedia communication starting with the Internet, research on wavelength division multiplexing (WDM:Wavelength Division Multiplexing) technology for high-speed and large-capacity communication is flourishing. One of the important optical components in constructing a WDM communication system is an optical multiplexer / demultiplexer that combines or separates light having multiple wavelengths. From the viewpoint of cost reduction, miniaturization, and high performance, this optical multiplexer / demultiplexer is formed of quartz (glass) or polymer on a substrate, and an optical transceiver is actually mounted to realize integration. [0003] An optical filter type, a directio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/12G02B6/293
Inventor 宫寺信生山本礼
Owner RESONAC CORPORATION