Microminiature optical add/drop filter based on two-dimensional photonic crystal

Abstract

The invention belongs to an optical add / drop filter, and particular relates to a microminiature optical add / drop filter based on a two-dimensional photonic crystal. The invention is characterized in that the optical add / drop filter comprises an upper end direct waveguide, a lower end direct waveguide and an autocollimating ring zone; the electromagnetic field energy of the upper end direct waveguide and the lower end direct waveguide are coupled to further form a resonant cavity by a photonic crystal ring zone; the range of the frequency or wavelength of photonic crystal autocollimating work is covered by an upper end waveguide working zone. The upper end direct waveguide and the lower end direct waveguide consist of dielectric column type photonic crystal arrays which are arranged by tetragonal lattices with line defects, and also consist of a photonic crystal arrays which are arranged by triangular lattices with line defects or two-dimensional plates with line defects. The photonic crystal autocollimating ring zone forms a photonic crystal autocollimating microring by adjusting the size of the radius of the photonic crystal of the ring zone under the limitation of an external photonic crystal band gap. The microminiature optical add / drop filter has more compact structure and simpler design and is applicable to optical communication and optical sensing system.

Description

technical field [0001] The invention belongs to optical add / drop filters, in particular to an ultra-small optical add / drop filter based on two-dimensional photonic crystals. Background technique [0002] Optical Add / Drop Filter (Optical Add / Drop Filter) mainly realizes downloading signals from the optical communication transmission system to the local area, or uploading signals sent by local users to other node users to enter the transmission system without affecting the transmission of other wavelength channels , and maintain the transparency of the optical domain, it is the core component of the widely used optical add-drop multiplexer, optical modulator and optical switch in the wavelength division multiplexing system (WDM). With the rapid growth of communication capacity and the emergence of various new services, the development of ultra-small add-drop filters and large-capacity channel filters needs to be solved urgently. Due to the high quality factor (Q) and small si...

AI Technical Summary

Problems solved by technology

However, for the air-hole photonic crystal microring, the straight waveguide obtained by simply removing a row of photonic crystals generally exhibits multi-modes, especially at the corners of the ring area, which easily excites other modes, thereby reducing the downlink efficiency of the filter. , but also increases the complexity of device design and production

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