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A transmitting module for mode multiplexing-wavelength division multiplexing

A wavelength division multiplexing and mode multiplexing technology, which is applied in the field of planar optical waveguide integrated devices, can solve the problems of large device size and many waveguide crossings, and achieve the effects of reduced insertion loss, less waveguide crossings, and simple and compact structure

Active Publication Date: 2017-05-24
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The more direct way is to directly combine the mode multiplexing device with multiple wavelength division multiplexing devices (such as arrayed waveguide gratings), but when this hybrid multiplexer is integrated with a laser array and an optical modulator array to form a transmitting module, There are too many waveguide crossings and the problem of excessive device size

Method used

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  • A transmitting module for mode multiplexing-wavelength division multiplexing
  • A transmitting module for mode multiplexing-wavelength division multiplexing
  • A transmitting module for mode multiplexing-wavelength division multiplexing

Examples

Experimental program
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Effect test

Embodiment 1

[0066] Take M=4, N=16 as an example, which includes 64 node units and a 4-channel mode multiplexer.

[0067] The laser array contains 16 laser units, and the channel spacing of the emission wavelength of each laser unit is Δλ ch =1.6nm, where the wavelength emitted by the laser unit 1n is λ n =1525.6nm+nΔλ ch , n=1,...,N.

[0068] Here, each connecting waveguide is a silicon nanowire optical waveguide based on silicon insulator SOI material: its core layer is silicon material with a thickness of 220nm and a refractive index of 3.4744; its lower cladding material is SiO 2 , with a thickness of 2 μm and a refractive index of 1.4404; its cladding is air with a refractive index of 1.0.

[0069] Considering the situation of M=4 and N=16, the 1×2 power divider in the node unit 3mn adopts a directional coupler structure, and the first 2×2 power divider 3mn6, the fifth connecting waveguide 3mn12, the second 2×2 The annular cavity formed by connecting the power divider 3mn7 and the...

Embodiment 2

[0074] Take M=8, N=16 as an example, which includes 128 node units and an 8-channel mode multiplexer.

[0075] The laser array contains 16 laser units, and the channel spacing of the emission wavelength of each laser unit is Δλ ch = 1.6nm. The node unit adopts such as figure 2In the unit structure shown, each connecting waveguide is made of silicon nanowire optical waveguide based on silicon insulator SOI material, the 1×2 power divider 3mn5, the first 2×2 power divider 3mn6, and the second 2×2 power divider 3mn7 adopt Such as Figure 8 The multimode interference coupler structure shown. The waveguide of the optical modulation area in the optical modulator adopts Figure 4 In the structure shown, high-speed modulation is achieved by the mechanism of the carrier depletion type. The intersection of the first connecting waveguide 3mn8 and the second connecting waveguide 3mn9 widens the width of the waveguide to reduce loss and crosstalk.

Embodiment 3

[0077] Take M=2, N=8 as an example, which includes 16 node units and a 2-channel mode multiplexer.

[0078] The laser array contains 8 laser units, and the channel spacing of the emission wavelength of each laser unit is Δλ ch = 1.6nm. The node unit adopts such as figure 2 In the unit structure shown, each connecting waveguide is made of silicon nanowire optical waveguide based on silicon insulator SOI material, the 1×2 power divider 3mn5, the first 2×2 power divider 3mn6, and the second 2×2 power divider 3mn7 adopt Such as Figure 9 The Mach-Zehnder interference coupler structure shown. The waveguide of the optical modulation area in the optical modulator adopts Figure 5 In the structure shown, high-speed modulation is realized by a carrier accumulation type mechanism. The intersection of the first connecting waveguide 3mn8 and the second connecting waveguide 3mn9 widens the width of the waveguide to reduce loss and crosstalk.

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Abstract

The invention discloses a transmitter module for mode multiplexing-wavelength division multiplexing. Each node cell of a node cell array is provided with four ports, which are a first port, a second port, a third port and a fourth port that are used for receiving unmodulated light, adjacent node cells are connected by corresponding ports so as to form an N*M array, the first ports of the row of node cells at the edge of the node cell array are respectively connected with output ends of N laser cells of a laser array, the fourth ports of the row of node cells at the edge of the node cell array are respectively connected with M input ends of an M channel mode multiplexer, and the output end of the M channel mode multiplexer is connected with output multimode waveguide. The transmitter module has the advantages of being concise and compact in structure and convenient in design, having little waveguide cross, and being beneficial to lowering insertion loss and channel crosstalk, and realizes two-dimension multiplexing of mode and wavelength.

Description

technical field [0001] The invention relates to a planar optical waveguide integrated device, in particular to a mode multiplexing-wavelength division multiplexing transmitting module. Background technique [0002] As we all know, long-distance optical communication has achieved great success. Similarly, optical interconnection, as a new interconnection method, can overcome the bottleneck problem of traditional electrical interconnection, and has attracted widespread attention. Since J.W.Goodman proposed to adopt the optical interconnection scheme in VLSI in 1984, the research of optical interconnection has made great progress. At present, optical interconnection is continuously advancing towards ultra-short distance interconnection, and its communication capacity demand is increasing day by day. Aiming at the large amount of data transmission in the optical interconnection system, the most direct method is to borrow the wavelength division multiplexing (WDM) technology co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/50G02B6/125G02B6/293
Inventor 戴道锌
Owner ZHEJIANG UNIV