Single-fiber three-way multiplexer with grating

Abstract

The invention provides a single-fiber three-way multiplexer with a grating. The single-fiber three-way multiplexer with the grating at least comprises an input waveguide used for being connected with an optical wave signal with a first wavelength and a second wavelength, an uploading waveguide used for being connected with an optical wave signal with a third wavelength, a first output waveguide, a second output waveguide and a multi-mode waveguide coupler, wherein the multi-mode waveguide coupler is used for separating a first wavelength signal and a second wavelength signal; the first wavelength signal and the second wavelength signal are output through the first output waveguide and the second output waveguide respectively; and in addition, the grating of the multi-mode waveguide coupler can reflect the optical wave signal with the third wavelength; the optical wave signal is output by the input waveguide; and preferably, the input waveguide, the uploading waveguide, the first output waveguide, the second output waveguide and the multi-mode waveguide coupler are formed by etching a semiconductor substrate. The single-fiber three-way multiplexer has the advantages of being compact and small in structure, completely compatible with the manufacturing process and a complementary metal oxide semiconductor (CMOS) process, free from a complex process, and low in processing cost.

Description

technical field [0001] The invention relates to the field of optical fiber access networks, in particular to a single-fiber three-way multiplexer with a grating. Background technique [0002] With the rapid development of optical fiber access network technology and the increase of IPTV, video on demand and online games, users' demand for access bandwidth is further increasing, and the requirements for optical fiber access network are getting higher and higher. Fiber-to-the-home technology (FTTH) has become the main technical solution of optical fiber access network, and passive optical network (PON) technology is the mainstream technology of FTTH, which can realize the integration of video, voice and data. In the PON technology used for FTTH, the core device to realize the communication between the optical line terminal (OLT) and the end user is the single-fiber three-way multiplexer. The multiplexer is an actual requirement in the application field, so it is of great signi...

AI Technical Summary

Problems solved by technology

The single-fiber three-way multiplexer currently used in practice is composed of discrete devices, which has the disadvantages of being difficult to package, large coupling loss, and high cost; and another three-way multiplexer based on planar optical waveguide technology (PLC) is due to the core The refractive index difference between the layer and the cladding is very small, resulting in its device size is still large

In addition, PLC-based three-way multiplexers often use multimode waveguide couplers (MMI) and arrayed waveguide gratings (AWG) in cascaded manner to achieve multiplexing functions, making the structure of the device not compact enough

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