High-pass low-filtration type filter mold device and preparation method thereof

Abstract

The invention provides a high-pass low-filtration type filter mode device and a preparation method thereof. The high-pass low-filtration type filter mode device comprises a substrate, a lower cladding, a core layer and an upper cladding which are stacked in sequence, the core layer comprises a waveguide and a functional area which are connected with each other; the waveguide comprises an input rectangular straight waveguide, a first tapered waveguide, a second tapered waveguide and an output rectangular straight waveguide which are integrated in sequence; the functional area is located between the first conical waveguide and the second conical waveguide and comprises passing structures and a filter mode structure, the filter mode structure is connected with the first conical waveguide and the second conical waveguide, and the passing structures are distributed on the two sides of the filter mode structure and connected with the first conical waveguide and the second conical waveguide. The high-order mode is transmitted through low loss of the passing structure, the fundamental mode or the mode lower than the passing mode order is guided by the first conical waveguide to the mode filtering structure to be changed into a radiation mode, and transmission cannot be continued. The filter realizes the functions of high-order mode passing and low-order mode filtering, and has the advantages of compact size, low loss and large bandwidth.

Description

technical field [0001] The invention relates to a high-pass and low-filter type filter and a preparation method thereof, belonging to the technical field of integrated optoelectronic devices. Background technique [0002] With the rapid development of communication technology and the continuous progress of science and technology, the demand for communication capacity shows an explosive growth, and the optical communication capacity based on wavelength division multiplexing technology is difficult to meet the demand. At the same time, due to the limitation of nonlinear Shannon capacity, the transmission capacity of single-mode fiber systems gradually reaches the upper limit. The proposed mode division multiplexing technique using multiple mutually orthogonal eigenmodes as different channels improves the communication capacity. [0003] Modular division multiplexing technology is an important means to cope with the ever-increasing demands of optical communication transmission...

AI Technical Summary

Problems solved by technology

However, so far, there are few research results on high-pass low-filtering model filters.

Some research results use special materials, such as graphene, hyperbolic materials and vanadium oxide, to achieve low-order mode filtering, but the cost is high; low-order mode filtering and optical resonant devices based on mode conversion can only prevent one Specific higher-order modes, and these structures require cascading various mode-blocking filters, the structure is complex, and the preparation process is cumbersome

[0005] In view of this, it is necessary to propose a high-pass low-filtering filter and its preparation method to solve the problems of high cost and large size, and achieve the effect of passing high-order modes and eliminating low-order modes

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