Narrowband Optical Filter Based on Microdisk Resonator

Abstract

The invention discloses an optical filter based on a micro-disk resonator, and the filter comprises an input optical waveguide which is used for inputting a to-be-processed broadband optical signal; amicro-disk optical filter which comprises a first-stage micro-disk optical filter and a second-stage micro-disk optical filter, wherein each stage of micro-disk optical filter comprises a micro-diskresonant cavity, and an input end straight waveguide and a download section straight waveguide which are adjacent to the micro-disk resonant cavity; a middle optical waveguide which comprises a firstmiddle optical waveguide and a second middle optical waveguide and is used for transmitting the broadband optical signals among the micro-disk optical filters; and an output optical waveguide which isused for outputting the broadband optical signal passing through the filtering output end of the second-stage micro-disk optical filter to finish a filtering function of the integrated optical filter. The filter only adopts two micro-disc resonator structures, and is simple in structure, low in loss, small in size and low in adjustment and control difficulty. The optical filter realizes the filtering function of narrow bandwidth and high roll-off rate, and can meet the requirements of the field of optical fiber communication for microwave photon signal processing.

Description

technical field [0001] The invention relates to the technical field of optical fiber communication, in particular to a narrow-band optical filter based on a microdisk resonator. Background technique [0002] The emergence of wavelength division multiplexing (WDM, Wavelength-Division Multiplexing) technology and Erbium Doped Fiber Amplifier (EDFA, Erbium Doped Fiber Amplifier) ​​has made breakthroughs in optical communication, and the speed of optical fiber transmission networks has continued to increase. Optical filters use optical methods and optical components to achieve the filtering function of optical signals in signal processing in the field of optical fiber communication technology. Compared with traditional electronic technologies, optical components have flexible and wide-ranging bandwidth characteristics, which can directly filter microwave signals with high frequency bandwidth. It is of great significance in the advanced applications of broadband access, quantum ...

AI Technical Summary

Problems solved by technology

Common optical filters with narrow bandwidth and high roll-off rate often use fiber Bragg grating (FBG, Fiber Bragg Grating), Mach-Zehnder (MZ, Mach-Zehnder) and other structures, but the above solutions have large losses and large volumes. High cost, poor stability, difficult adjustment and control, etc.

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