On-chip integrated broadband adjustable photon filter

Abstract

The invention discloses an on-chip integrated broadband adjustable photon filter, which comprises a plurality of micro-ring structures connected in parallel. Each micro-ring structure comprises a runway type micro-ring resonator, an input straight waveguide, an output straight waveguide, a first heater, a second heater and a 180-degree bent waveguide. The input straight waveguide and the output straight waveguide are located at the two sides of the micro-ring resonator respectively; the input straight waveguide and the output straight waveguide are both parallel to the straight line segment ofthe micro-ring resonator; and the input straight waveguide and the straight line segment of the micro-ring resonator at the side where the input straight waveguide is located and the output straightwaveguide and the straight line segment of the micro-ring resonator at the side where the output straight waveguide is located form coupled regions respectively. The first heaters are arranged besidethe coupled regions and are used for heating the coupled regions; the second heaters are arranged beside the micro-ring resonators and are used for heating the micro-ring resonators; and meanwhile, every two adjacent micro-ring structures are connected through the bent waveguide, so that parallel connection of all the micro-ring structures is achieved. Thermal crosstalk between the adjacent micro-ring resonators is reduced, and accurate adjustment of bandwidth and central wavelength of the photon filter is realized.

Description

technical field [0001] The invention relates to the technical field of photonic integrated chips, in particular to an on-chip integrated broadband tunable photonic filter. Background technique [0002] In the field of photonic integrated chip technology, on-chip tunable photonic filters are one of the most important integrated devices, which can be used as wavelength division multiplexing / demultiplexing devices in optical communication systems, and can also be applied to microwave photonic signal processing. On-chip integrated photonic filters with low crosstalk and tunable central wavelength are ideal photonic components. Parallel connection of microring resonators is one of the main ways to realize broadband tunable photonic filters. [0003] figure 1 It is currently the most typical parallel connection method of photonic filters through parallel connection of microring resonators. figure 1 Among them, between the straight line segments of the input straight waveguide 1...

AI Technical Summary

Problems solved by technology

[0003] figure 1 It is currently the most typical parallel connection method of photonic filters through parallel connection of microring resonators. figure 1 Among them, between the straight line segments of the input straight waveguide 10 and its adjacent microring resonator 30, between the straight line segments of two adjacent microring resonators 30, the distance between the output straight waveguide 20 and its adjacent microring resonator 30 Coupling regions 40 are formed between the straight segments, and the distance between two adjacent microring resonators 30 in the direction perpendicular to the input straight waveguide 10 is very small, on the order of tens of microns, which leads to a When the ring resonator 30 is heated to change its central wavelength and coupling coefficient, it will also affect the adjacent micro-ring resonator 30, changing the central wavelength and coupling coefficient of the adjacent micro-ring resonator 30, which is commonly referred to as the adjacent micro-ring resonator. Thermal crosstalk between microring resonators 30 is large

Since the properties of each microring resonator 30 cannot be independently adjusted, that is, to reduce the thermal crosstalk between the microring resonators 30, this parallel connection method cannot realize precise adjustment of the bandwidth and central wavelength of the photonic filter

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