Rectangular optical filter based on annulet and design method of rectangular optical filter

Abstract

The invention discloses a rectangular optical filter based on an annulet. According to the rectangular optical filter, the trouble of independent turning multicavity can be avoided, the structure is simple, the size is small, turning is simple and convenient, the insensitivity of manufacturing error is achieved, good pass band flatness and rectangular coefficient are achieved, and about twice group delay compared with an ordinary annulet can be obtained. The rectangular optical filter based on the annulet is provided with a first port (In), a second port (Through), a third port (Drop) and a fourth port (Add), a microstructure with subwavelength size is added to the waveguide of a dual-arm coupling annulet to form a reflection point, a mode of back propagation and a mode with two propagation directions of clockwise direction and counter clockwise direction are stimulated, the reflection point is formed by the added microstructure to cause backscattering and intercoupling, a new resonance peak is subjected to spectral peak spliting at the original resonance peak, and the flatness of the pass band is adjusted by controlling the coupling strength to obtain the rectangular optical filter. The invention further provides a design method.

Description

technical field [0001] The invention relates to the technical fields of optical communication and optoelectronics, in particular to a microring-based rectangular optical filter and a design method of the microring-based rectangular optical filter. Background technique [0002] Rectangular optical filters based on microrings have important applications in wavelength division multiplexing and achieving flat group delay. Related rectangular optical filter structures based on microrings include: multi-ring series coupling, multi-ring parallel coupling, etc. [0003] The biggest disadvantage of this structure is that multiple independent tuning units (such as heating electrodes, etc.) are required to post-compensate the errors introduced by the manufacture of each microring, which is not easy to control and use. Secondly, the size of the overall device will also increase, which is not conducive to dense integration. Contents of the invention [0004] In order to overcome the ...

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Problems solved by technology

[0003] The biggest disadvantage of this structure is that it is necessary to use multiple independent tuning units (such as heating electrodes, etc.) to post-compensate the errors introduced by the manufacture of each microring, which is not easy to control and use.

Secondly, the size of the overall device will also increase, which is not conducive to dense integration

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