Photonic crystal multimode optical fiber with completely-separated intrinsic modes

Abstract

The invention discloses a photonic crystal multimode optical fiber with completely-separated intrinsic modes. The photonic crystal multimode optical fiber comprises a birefringent fiber core which isasymmetrical in horizontal and vertical directions, an inner cladding layer formed by arranging circular air holes in a hexagonal array and an outer cladding layer formed by pure silicon dioxide. Theoptical fiber supports more than 10 intrinsic modes, and the effective refractive index difference between any two adjacent modes is greater than 1x10<-4> and even greater than 1x10<-3>, that is, allmodes are completely separated, thereby realizing the multichannel intrinsic-mode multiplexing communication of the optical fiber. According to the invention, the mode division multiplexing transmission is directly carried out on the basis of an optical fiber intrinsic mode, the supported intrinsic modes are completely separated and simplified, and the intrinsic mode stable transmission of the multichannel optical fiber can be realized without MIMO-DSP technology. The photonic crystal multi-mode optical fiber provided by the invention is completely composed of a pure silicon dioxide matrix andan air hole lattice, is based on the existing photonic crystal optical fiber manufacturing process, and is convenient for implementing the actual drawing.

Description

technical field [0001] The invention belongs to the field of optical communication, and more specifically relates to a photonic crystal multimode optical fiber with completely separated eigenmodes. Background technique [0002] The key technologies to improve optical communication capacity mainly include various signal multiplexing technologies and advanced signal modulation technologies. For example, signal multiplexing technologies include wavelength division multiplexing, time division multiplexing, polarization multiplexing, orthogonal frequency division multiplexing, space division multiplexing, etc.; advanced signal modulation technologies include m-order phase shift keying (m-PSK) , m-order quadrature amplitude modulation (m-QAM), etc. Among them, space division multiplexing uses the space dimension to increase the number of parallel channels in the space to effectively improve the communication capacity of the transmission system, and still has a very wide developme...

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Problems solved by technology

[0003] In view of the above problems, the present invention provides a photonic crystal multimode optical fiber with completely separated eigenmodes, which is used in the field of mode division multiplexing transmission directly based on optical fiber eigenmode multiplexing, aiming at solving the problem of existing optical fiber multi-channel mode division multiplexing. The use of transmission needs to be supplemented by MIMO-DSP to alleviate the problem of mode crosstalk

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