Photonic crystal triple wavelength division multiplexer based on application of FTTH

Abstract

The invention relates to a photonic crystal triple wavelength division multiplexer based on the application of FTTH (fiber to the home). The division multiplexer adopts the two-dimensional photonic crystal with hexagonal lattice air holes on a high refractivity flat plate. The photonic crystal triple wavelength division multiplexer contains four photonic crystal line-defect waveguides and two photonic crystal point-defect micro-cavities, wherein the four photonic crystal line-defect waveguides are an input waveguide, a first channel, a second channel and a third channel respectively; the two defect micro-cavities are a downlink micro-cavity with the wavelength of 1490nm and a downlink micro-cavity with the wavelength of 1310nm; the two micro-cavities are placed on both sides of the input waveguide; and the second channel and the third channel are separately connected with the 1310nm of downlink micro-cavity and the 1490nm of downlink micro-cavity, and the tail end of the input waveguide is connected with the first channel through a folding directional coupler. The invention is convenient to prepare, has high practicability and micron dimension and can be applied in the FTTH access network.

Description

technical field [0001] The invention relates to a triple wavelength division multiplexer (Triplexer), which is suitable for future fiber-to-the-home (FTTH) access networks. Background technique [0002] Optical triple wavelength division multiplexers are very important devices for fiber-to-the-home applications in passive optical networks. According to the recommendation of ITU G.983, it can filter out three set wavelengths, namely 1310nm uplink signal, 1490nm and 1550nm two downlink signals. Currently, planar lightwave loop (PLC) technology is the most promising option for making such low-cost devices and has been developed commercially. Such multiplexers based on arrayed waveguide grating technology have been widely used in coarse wavelength division multiplexing and dense wavelength division multiplexing systems. These technologies have many advantages such as easy integration, high efficiency and reliability. However, these traditional optical triple wavelength divisi...

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Problems solved by technology

[0004] In order to overcome the shortcomings of the existing triple wavelength division multiplexer, which are difficult to manufacture, poor in practicability, and cannot be applied to fiber-to-the-home access networks, the present invention provides a device that is easy to manufacture, strong in practicability, has a micron level and can be applied Photonic crystal triple wavelength division multiplexer based on fiber-to-the-home application in fiber-to-the-home access network

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