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A Novel Optical Isolator Based on Waveguide Structure

An optical isolator and waveguide technology, which is applied in the coupling of optical waveguides, instruments, optics, etc., can solve the problems of unfavorable monolithic integration of optoelectronic devices, high price, complex structure of optical isolators, etc., and achieve low manufacturing process difficulty and high bandwidth. The effect of maximizing and simplifying working conditions

Active Publication Date: 2018-04-27
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the problems of complex structure, high price and unfavorable monolithic integration with other optoelectronic devices of the traditional optical isolator designed by using the Faraday effect

Method used

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  • A Novel Optical Isolator Based on Waveguide Structure
  • A Novel Optical Isolator Based on Waveguide Structure
  • A Novel Optical Isolator Based on Waveguide Structure

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Embodiment 1. The first novel optical isolator based on the optical waveguide structure

[0052] The structure of the optical isolator is as Figure 1 to Figure 3 As shown, it consists of a substrate 1 and a waveguide layer located on the substrate 1 . The waveguide layer does not need to use any magneto-optical materials, and is composed of two parts of waveguides, wherein the first waveguide 2 is used to protect a part from being etched when the straight waveguide formed by the first etching on the waveguide layer is etched for the second time. A section of convex waveguide is formed by etching; the second waveguide 3 is an ordinary straight waveguide obtained without protection during secondary etching.

[0053] The substrate layer 1 is silicon dioxide.

[0054] The first waveguide 2 is monocrystalline silicon.

[0055] The second waveguide 3 is monocrystalline silicon.

[0056] The principle of the present invention is based on the non-reciprocity of specular re...

Embodiment 2

[0068] Embodiment 2. The second novel optical isolator based on the optical waveguide structure

[0069] The structure of the optical isolator is as Figure 4 to Figure 5 As shown, it is composed of the first novel optical isolator based on the optical waveguide structure provided in Embodiment 1 and integrated with the polarization beam splitter 4 based on the optical waveguide structure. The optical isolator can realize the function of optical power isolation on the basis of the first novel optical isolator based on the optical waveguide structure provided in Embodiment 1. For specific structural parameters and performance indicators of the polarization beam splitter 4 based on the optical waveguide structure, refer to the original literature Dai, D., Z. Wang, and J.E. Bowers, Ultrashort broadband polarization beam splitter based on anasymmetrical directional coupler. Optics Letters, 2011.36(13):p.2590-2592.

[0070]The polarization beam splitter 4 based on the optical wav...

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PUM

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Abstract

The invention relates to a novel optoisolator based on a waveguide structure. No magneto-optic material needs to be adopted in the novel optoisolator; the novel optoisolator is formed by a substrate (1) and two waveguide layers located on the substrate (1); a first waveguide (2) is a waveguide used for protecting part of a straight waveguide against etching when secondary etching is carried on the straight waveguide formed by primary etching the waveguide layers and has a protruding section; a second waveguide (3) is a common straight waveguide obtained when secondary etching is carried out without protection. The novel optoisolator is used for achieving the function that TE or TM polarized light with the certain wave length is isolated; the novel optoisolator is achieved based on the waveguide structure, compatibility with the semiconductor technology is achieved, and monolithic integration with other optoelectronic devices such as semiconductor laser units is easily achieved. The novel optoisolator does not depend on special material characteristics like magneto-optic material characteristics, and therefore the novel optoisolator can be achieved on any optical waveguide material like various III-V compound semiconductors, silicon-based semiconductors, SiQ2 and the like.

Description

technical field [0001] The invention belongs to the field of integrated optoelectronic devices, in particular to a novel optical isolator (Optical Isolator) based on a waveguide structure. The characteristic of ordinary specular reflection is utilized, so that the polarization state of the reflected light is perpendicular to the polarization state of the input linearly polarized light, thereby achieving the effect of optical isolation. If it is necessary to achieve optical power isolation under specific requirements, a polarization beam splitter (Polarization BeamSplitter) also based on the optical waveguide structure can be designed at the front end of the isolator to eliminate the reflected light. The invention has potential application value in reducing device cost and monolithic integration of optoelectronic devices. Background technique [0002] An optical isolator is a passive optical device that allows light to pass through and blocks reflected light. Its function is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/26G02B6/122
CPCG02B6/122G02B6/264
Inventor 李洵朱仲书
Owner HUAZHONG UNIV OF SCI & TECH