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An etched diffraction grating wavelength division multiplexer with bragg tooth surface structure and its design method

A wavelength division multiplexer and diffraction grating technology, applied in the field of optical communication, can solve the problems of the center wavelength error of the diffraction band of the device, limited application and promotion, and the boundary of the diffraction band cannot be effectively determined, and achieves low insertion loss and low technological difficulty requirements. , high efficiency

Active Publication Date: 2018-03-02
YANGZHOU RUNWELL OPTOELECTRONICS TECH
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  • Application Information

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Problems solved by technology

However, the limitation of the Bragg grating design method of the device makes the center wavelength of the diffraction band of the device have a large error, and the boundary of the diffraction band cannot be effectively determined.
Secondly, the Bragg concave grating that satisfies both the Rowland circle structure and the ellipse structure is only a special case of Bragg blazed grating, which greatly limits its application and promotion.

Method used

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  • An etched diffraction grating wavelength division multiplexer with bragg tooth surface structure and its design method
  • An etched diffraction grating wavelength division multiplexer with bragg tooth surface structure and its design method
  • An etched diffraction grating wavelength division multiplexer with bragg tooth surface structure and its design method

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Embodiment 1

[0047] Such as figure 1 The Bragg-EDG structure, its detailed Bragg reflector structure see image 3 . The Bragg reflector structure is composed of periodic dielectric layer stacks (thickness d 1 , Refractive index n 1 The first dielectric 304 with a thickness d 2 , Refractive index n 2 of the second 305 stack). The surface of the first dielectric layer 304 is a Bragg reflective tooth surface 301, the thickness of the non-reflective surface of this structure is equal to a single Bragg period 303, the grating period 302 is equal to d / sinθ (θ is the grating blaze angle 310), and the incident light beam 306 passes through the Bragg-EDG Diffraction and splitting are performed after the grating to obtain a diffracted beam 307 . The feature of this structure is that part of the periodic structure of a single reflective surface is extended and supplemented by adjacent reflective surfaces, which can improve the reflection efficiency of the device and reduce the insertion loss. ...

Embodiment 2

[0049] Such as figure 2 The Bragg-EDG structure, its detailed Bragg reflector structure see Figure 4 , its single Bragg reflector is an independent reflective tooth surface 401 structure, the thickness of the non-reflective surface of this structure is equal to multiple Bragg periods 303, namely N*d, and the grating period 302 is equal to N*d / sinθ (θ is the grating blaze angle 310 ), the incident light beam 306 passes through the Bragg-EDG grating and then undergoes diffraction and splitting to obtain a diffracted light beam 307. The diffraction order of this structure is large, and it is generally used in the case of dense wavelength division multiplexing with high resolution.

[0050] Concrete design steps of the present invention are:

[0051] 1. According to the material refractive index of the periodic structure of the Bragg reflector, the Bragg-EDG incident light angle, and the blaze angle of the Bragg reflector, calculate the normalized frequency, the relationship b...

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Abstract

The invention discloses a wavelength division multiplexer having an etching diffraction grating with a Bragg tooth surface structure and a design method thereof and belongs to the field of photo-communication wavelength division multiplexing. The wavelength division multiplexer is comparatively low in manufacture technical difficulty, good in frequency spectrum performance and requires no secondary coating. The wavelength division multiplexer includes an input waveguide, an output waveguide array, a free transmission zone and an etching concave grating with the Bragg tooth surface structure. The wavelength division multiplexer is characterized in that the tooth face of the etching concave grating adopts the Bragg tooth face structure which is a reflecting face structure with mediums having different refractive indexes arranged periodically. The etching diffraction grating with the Bragg tooth surface structure is designed based on a modified grating equation which is deduced by the combination of a photonic crystal theory and a grating equation. The wavelength division multiplexer can be prepared by using a shallow etching method and is low in processing technical difficulty, small in size and high in diffraction efficiency, and is capable of realizing course wavelength division multiplexing and intensive wavelength division multiplexing.

Description

technical field [0001] The invention belongs to the field of optical communication, relates to wavelength division multiplexing technology, in particular to an etching diffraction grating wavelength division multiplexer with a Bragg tooth surface structure and a design method thereof. Background technique [0002] Wavelength division multiplexing technology can realize channel expansion of tens or hundreds of times on a single waveguide or optical fiber, and has become the mainstream technology for optical communication expansion since the mid-to-late 1990s. With the wide application of cloud computing, etc., the requirements for capacity expansion are getting higher and higher, and it is urgent to further increase the number of wavelength division multiplexing channels. [0003] The wavelength division multiplexing device is the core device of the wavelength division multiplexing technology, among which the planar integrated waveguide multiplexer / demultiplexer is the mainst...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/293G02B6/124
CPCG02B6/1225G02B6/124G02B6/29304
Inventor 朱京平杜炳政李宝毛玉政张云尧
Owner YANGZHOU RUNWELL OPTOELECTRONICS TECH
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