N-mode multiplexer/demultiplexer based on asymmetric Y-furcate structure

Abstract

The invention discloses an N-mode multiplexer / demultiplexer based on an asymmetric Y-furcate structure. The N-mode multiplexer / demultiplexer is formed by cascade connection of N-1 asymmetric Y furcates. Each asymmetric Y furcate comprises a main waveguide, a wide branching waveguide and a thin branching waveguide. The wide branching waveguides are larger than the thin branching waveguides in width. The sum of the widths of the wide branching waveguides and the widths of the thin branching waveguides is equal to the widths of the main waveguides. The included angles of the positions where the wide branching waveguides are intersected with the thin branching waveguides are smaller than 1 degree. The main waveguides and the wide branching waveguides of two adjacent asymmetric Y furcates are connected through tapered heat insulation waveguides. The widths of the main waveguides of the two adjacent asymmetric Y furcates are different. The N-mode multiplexer / demultiplexer has the advantages of achieving transmission of a plurality of data channels, being large in bandwidth and low in loss and crosstalk, and the like.

Description

technical field [0001] The invention relates to a multiplexing / demultiplexing device, in particular to an N-mode multiplexing / demultiplexing device based on an asymmetrical Y branch structure. Background technique [0002] With the rapid growth of Internet data traffic, the capacity of optical links needs to be expanded urgently. Currently, ways to expand the capacity of optical links include space division multiplexing technology, wavelength division multiplexing technology, polarization multiplexing technology and mode multiplexing technology. Among them, each optical mode in mode multiplexing technology can be used as an independent channel for data transmission, which has the advantage of flexible processing of eigenmodes, and has become an important solution to improve the communication capacity of a single link in optical interconnection. [0003] As a key device in mode multiplexing transmission systems, mode multiplexer / demultiplexer has attracted more and more atte...

AI Technical Summary

Problems solved by technology

However, traditional mode multiplexers / demultiplexers based on cascaded asymmetric directional couplers need to precisely control the coupling length and strength of the asymmetric directional couplers to achieve multiple data channel transmission, based on cascaded multimode grating-assisted couplers The traditional mode multiplexer / demultiplexer is limited by the bandwidth of the grating-assisted coupler itself. Although multiple data channel transmission can be realized, the capacity expansion of the optical link is limited.

Therefore, conventional mode multiplexers / demultiplexers based on cascaded asymmetric directional couplers and cascaded multimode grating-assisted However, the expansion of optical link capacity is limited by the performance of its own devices, and the expansion of optical link capacity is relatively limited.

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