Array type wave guide multiplexing/demultiplexing device

Abstract

This invention provides an array waveguide multipath multiplex / demultiplex device including input waveguide, input panel waveguide, waveguide array, output panel waveguide, output wavejuide, waveguide array with constant adjacent waveguide length difference is connected with and output waveguide is connected with, a ladder waveguide coupler with a branch is in between input waveguide and input panel waveguide including ordinary single mode or quasi-single mode waveguide and a ladder waveguide narrowing steadily along the direction from the waveguide to the panel waveguide, that is, the narrow end of ladder waveguide is connected with the panel waveguide, two ladder waveguides are set at either side that is to say, the broad end is connected with the panel waveguide.

Description

technical field [0001] The invention relates to an arrayed waveguide multiplexer / demultiplexer, in particular to an arrayed waveguide multiplexer / demultiplexer with low crosstalk and flat spectral response, belonging to the wavelength division multiplexing technology in the field of optical transmission Waveguide array grating type optical wavelength multiplexer / demultiplexer in . Background technique [0002] With the development of optical transmission research, wavelength division multiplexing technology has become an effective means to increase the capacity of communication information. The so-called wavelength division multiplexing refers to combining multiple lights of different wavelengths into the same waveguide or optical fiber for transmission, and demultiplexing is to divide the lights of different wavelengths in the same waveguide or optical fiber into different waveguides or optical fibers according to the wavelength. technology. The key part to realize the wa...

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Problems solved by technology

This solution increases the insertion loss, and at the same time, the structure of the arrayed waveguide is more complicated, and the process is more difficult

[0015] The second is to add a Y-shaped branch between the input waveguide 1 and the slab waveguide 2, or a multimode interference waveguide, because at the connection between the slab waveguide and the Y branch (or multimode interference waveguide), the Y branch or the multimode Interferometric waveguides can be realized as figure 2 The field distribution shown, such that the interference pattern of this field distribution after passing through AWGR also has the following image 3 The field distribution shown, so it can achieve a flat spectral response, which is also a method that is used more, but this method generally has a larger insertion loss, but whether it is a multimode waveguide or a Y branch, there is a relatively large radiation Loss, so that the field distribution of the interference pattern after they pass through the AWG has a relatively large side convex, which leads to a relatively large crosstalk

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