Modulus-division multiplexer with low nonlinear coefficients

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 ...

AI Technical Summary

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, et al.Structured directional coupler pair for multiplexing of degenerate modes[C].Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference. IEEE, 2013:1-3; 14 Xie Y, Fu S, Liu H, et al.Design and numerical optimization of a mode multiplexer based on few-modefiber couplers [J]. Journal of Optics, 2013, 15(12):3901-3901; 15 Tsekrekos CP, Syvridis D. Symmetric Few-Mode Fiber Couplers as the Key Component for Broadband Mode Multiplexing [J]. Journal of Lightwave Technology, 2014, 32(14): 2461-2467.] designed a mode directly coupled multiplexer; the multiplexer The manufacturing process of the multiplexer is simple, it can be directly fused with the optical fiber, and has a wide operating band; but the design of the multiplexer does not consider the non-linear problem of the transmission channel

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