Modulus-division multiplexer with low nonlinear coefficients

A nonlinear coefficient and multiplexer technology, applied in the field of optical information processing and optical fiber communication, can solve problems such as narrow working band, difficult integration, high loss, etc., and achieve large effective mode field area, low nonlinear coefficient, and wide application foreground effect

Active Publication Date: 2017-05-17
LIAOCHENG UNIV
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Problems solved by technology

Although the structural complexity of the "photonic lantern" is lower than that of the space coupler, its manufacturing process is precise and complex, and it is very difficult to precisely control the position of the optical fiber when it is melted, the thickness and length of the tapered body; the output port formed by the tapered Not exactly matched to the transmission channel, resulting in high loss
Literature [12 Shi Jian. Research on mode division multiplexing communication technology based on few-mode fiber [D]. Jilin University, 2013] designed a mode division multiplexer/demultiplexer based on asymmetric planar waveguide, which realized the mode multiplexing However, the planar multiplexer has the problems of narrow working band, difficult integration, and difficult fusion with optical fiber
Literature[13 Huang B, Xia C, Matz G...

Method used

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  • Modulus-division multiplexer with low nonlinear coefficients
  • Modulus-division multiplexer with low nonlinear coefficients
  • Modulus-division multiplexer with low nonlinear coefficients

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Embodiment 1

[0021] Example 1 figure 1 It is a schematic diagram of a single-channel cross-section of a low-nonlinear coefficient mode division multiplexer of the present invention, and the single-channel cross-section of the multiplexer is generally composed of a pure silica matrix cladding and a doped silica core; The circle radii are denoted as R1 and R2 respectively, corresponding to the outer diameter of the core and the outer diameter of the cladding in turn, where R1=38 µm and R2=100 µm. The channel core radius and refractive index distribution are designed to be balanced; the channel cladding and core center refractive indices are 1.4440 and 1.4449 respectively; the refractive index from the channel core center to the cladding changes gradually, and is set according to equation (1). The characteristics of the mode division multiplexer are studied by full vector finite element method and beam propagation method.

[0022] figure 2 is the channel effective area and the nonlinear c...

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Abstract

The invention provides a modulus-division multiplexer with low nonlinear coefficients. 6-mode few-mode multiplexing with gradually-varied refractive index distribution, a large effective mode field area, low nonlinear coefficients, high coupling efficiency and a wide working band is realized; in the working band of 1.45mu m-1.65mu m, the coupling efficiency of the modulus-division multiplexer is better than -0.449dB, and a flat characteristic is achieved; and due to the characteristic, the modulus-division multiplexer has wide application prospects in the fields of optical-fiber communication few-mode transmission, Front-haul few-mode transmission and the like.

Description

technical field [0001] The invention relates to a mode division multiplexing structure, in particular to a low nonlinear coefficient mode division multiplexer, which can be applied to the fields of optical fiber communication, optical information processing and the like. Background technique [0002] Optical fiber is an important transmission medium for optical fiber communication systems; with the further development of optical fiber manufacturing technology, people realized a low-loss optical fiber with a loss of about 0.2dB / km in the 1550nm band in 1979; low-loss optical fiber started a revolution in the field of optical fiber communication In 1995, the commercialization of erbium-doped fiber amplifiers working in the 1550nm band led to the great development of optical fiber communication and nonlinear fiber optics; various types of optical fibers and optical fiber communication systems were widely used [1 G. P. Agrawal, Nonlinear Fiber Optics, 5e, Elsevier Inc. Elsevier ...

Claims

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Application Information

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IPC IPC(8): G02B6/293
CPCG02B6/2938
Inventor 郑宏军刘倩倩黎昕白成林胡卫生
Owner LIAOCHENG UNIV
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