Transverse electric-pass polarizer based on composite waveguide

A transverse electric field and composite waveguide technology, applied in the field of optoelectronics, can solve problems such as the influence of extinction ratio, and achieve the effects of small size, reduced coupling loss, and easy optical integration

CN107132616AInactive Publication Date: 2017-09-05ZHEJIANG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2017-09-05
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a transverse electric-pass polarizer based on composite waveguides. The polarizer comprises an incident silicon waveguide, an emitted silicon waveguide, and a middle coupling portion between the incident silicon waveguide and the emitted silicon waveguide. The middle coupling portion is of a five-layer waveguide structure arranged on an SOI substrate, the five-layer waveguide structure sequentially including, from bottom to top, a lower silicon layer, a lower silicon dioxide layer, an upper silicon layer, an upper silicon dioxide layer and a metal chromium layer. When a TM mold transmitted from the incident silicon waveguide passes by the middle coupling portion, the TM mold is coupled from the lower silicon dioxide layer to the upper silicon dioxide layer and is absorbed for attenuation by the metal chromium layer. When a TE mold transmitted from the incident silicon waveguide passes by the middle coupling portion, the TE mold is transmitted along the lower silicon dioxide layer and will not be coupled to the upper silicon dioxide layer. The polarizer has the advantages of small size, high extinction ratio and low insert loss, enables coupling loss to be reduced, and facilitates optical integration.
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Description

technical field

[0001] The invention relates to the technical field of optoelectronics, in particular to a polarizer based on a composite waveguide through which a transverse electric field passes. Background technique

[0002] With the introduction of long-distance all-optical networks, optical communication systems are becoming more and more complex. The high sensitivity of silicon-based components to the polarization of incident light has attracted people to design efficient and compact polarization control components, including polarizers, polarization beam splitters, and polarization rotators. In these polarization-controlling components, polarizers can be used to suppress the passage of unwanted polarization states and thus play an integral part in solving the polarization-dependent problems of many optical systems.

[0003] For on-chip applications, polarizers must achieve ultra-small packages, high extinction ratios, and low losses. Many TE-pass and transverse magn...

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Embodiment Construction

[0033] The present invention will be described in detail below with reference to the drawings and specific embodiments.

[0034] Such as figure 1 and 2, the specific implementation of the present invention refers to as figure 1 , the three-dimensional schematic diagram of the TE-pass polarizer of this embodiment, including the incident silicon waveguide and the outgoing silicon waveguide and the intermediate coupling part between the incident silicon waveguide and the outgoing silicon waveguide.

[0035] As shown in Figure 2(a), the middle coupling part is a five-layer waveguide structure placed on the SOI substrate 1. The five-layer waveguide structure is the lower silicon layer 2, the lower silicon dioxide layer 3, and the upper silicon layer from bottom to top. 4. Upper silicon dioxide layer 5 and metallic chromium layer 6 . The upper silicon layer 4, the upper silicon dioxide layer 5 and the metal chromium layer 6 have the same width, and the length of the middle coupl...