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A grating-type single-fiber three-way multiplexer

A single-fiber three-way, multiplexer technology, applied in the field of optical communication, can solve the problems of large size, difficult packaging, and high cost, and achieve the effects of low insertion loss, reduced crosstalk, and low cost

Active Publication Date: 2020-08-14
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The single-fiber three-way multiplexer currently in practical use is coupled by separate components, which has disadvantages such as high cost, difficult packaging and large size, and is far from meeting the development of future optical devices.

Method used

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  • A grating-type single-fiber three-way multiplexer
  • A grating-type single-fiber three-way multiplexer
  • A grating-type single-fiber three-way multiplexer

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specific Embodiment

[0041] The silicon nanowire optical waveguide based on silicon insulator (SOI) material is selected: the core layer is silicon material, the thickness is 220nm, and the refractive index is 3.4744; the lower cladding material is SiO 2 , with a thickness of 2 μm and a refractive index of 1.4404; the upper cladding material is SU-8 with a thickness of 1.2 μm and a refractive index of 1.57.

[0042] For the first mode demultiplexer, the widths on both sides of the wide tapered waveguide in the evolution region are selected to be 0.45 μm and 0.55 μm respectively, and the widths on both sides of the narrow tapered waveguide in the evolution region are respectively 0.25 μm and 0.12 μm, and the lengths of the three sections are respectively 15 μm, 35 μm and 5 μm, the distance between the wide and narrow tapered waveguides remains unchanged at 0.2 μm, the maximum distance between the front S-shaped waveguide and the light waveguide is 0.5 μm, and the maximum distance between the rear S-...

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Abstract

The invention discloses a grating type triplexer. The output end of a first grating filter is connected with the input end of a second grating filter sequentially through a first single-mode connection optical waveguide, a first mode filter and a second single-mode connection optical waveguide; after sequentially passing through a third single-mode connection optical waveguide, a curved waveguideand a second mode filter, the output end of the second grating filter is connected with the input end of a third grating filter; the download end of the third grating filter is a third output waveguide; an input waveguide is used as an input port of two channel signals and an output port of one channel signal, a first output waveguide is used as an input port, a second output waveguide is used asan output port, and a third output waveguide is used as an output port; and the first and second mode filters are curved waveguides. According to the invention, crosstalk among channels can be reduced, the low-insertion-loss low-crosstalk on-chip triplexer is obtained, and the grating type triplexer has the advantages of simple process, simple structure, low insertion loss, low crosstalk and the like.

Description

technical field [0001] The invention belongs to the field of optical communication, and in particular relates to a grating-type single-fiber three-way multiplexer. Background technique [0002] With the gradual development and integration of radio and television networks and the Internet, data services have an increasing demand for bandwidth. In the current optical communication system, Fiber To The Home (FTTH) is a transmission method that directly connects optical fiber to the user's home, and it solves the "last mile" information transmission. Single-fiber three-way multiplexer is a core device of FTTH in passive optical network mode. Its main function is to transmit downlink analog CATV signal with wavelength of 1550nm, downlink digital signal with wavelength of 1490nm and uplink terminal user transmission signal with wavelength of 1310nm Multiplexing into the same optical fiber, thus realizing "triple play". [0003] The single-fiber three-way multiplexer currently in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/12G02B6/124G02B6/293
Inventor 戴道锌刘大建
Owner ZHEJIANG UNIV