A Dual Polarization Mode Multiplexing-Demultiplexing Chip Based on Monolithic Integration

Abstract

The invention discloses a monolithic integration based dual polarization mode multiplexing-demultiplexing chip. the two input ends of each polarization beam combiner are connected to respective inputsingle mode waveguide, and the output ends are connected to the input ends of corresponding spot-size converters; the output ends of the spot-size converters are connected to one ends of connecting waveguide, and the other ends of the connecting waveguide are connected to output multimode waveguide through a mode multiplexer; an optical signal can be input from the input single mode waveguide andoutput from the output multimode waveguide when the chip is taken as a multiplexer; and the optical signal can be input from the output multimode waveguide and output from the input single mode waveguide when the chip is taken as a demultiplexer. The chip can load multi-channel signal to N eigenmodes in the same multimode waveguide, so that mode multiplexing can be formed; transmission capacity can be enlarged by combining a polarization multiplexing technology; and the chip has outstanding advantages of conveniently connecting to an on-chip optical interconnection system and coupling to few-mode fibers.

Description

technical field [0001] The invention relates to a multiplexing-demultiplexing device, in particular to a dual polarization mode multiplexing-demultiplexing chip based on monolithic integration. Background technique [0002] As we all know, long-distance optical communication has achieved great success. Similarly, optical interconnection, as a new interconnection method, can overcome the bottleneck problem of traditional electrical interconnection, and has attracted widespread attention. At present, optical interconnection is continuously advancing towards ultra-short distance interconnection, and its communication capacity demand is increasing day by day. In view of the large amount of data transmission in the optical interconnection system, the most direct method is to borrow the wavelength division multiplexing (WDM) technology commonly used in long-distance optical fiber communication systems. [0003] However, the wavelength division multiplexing system requires expens...

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Problems solved by technology

However, this design requires the asymmetric directional coupler to have significant polarization sensitivity, which is usually achieved by using an ultra-high refractive index difference optical waveguide, so it is more suitable for on-chip optical interconnection systems, but it is difficult to couple with few-mode fibers

The literature [Nobutomo Hanzawa et al., "Two-mode PLC-based modemulti / demultiplexer for mode and wavelength division multiplexed transmission." Opt. Express.21(22): 25752–25760, 2013] gives a SiO-based 2 The asymmetric directional coupler of optical waveguide can realize the coupling with few-mode fiber, but it has polarization insensitivity, it is difficult to realize polarization multiplexing, and SiO 2 Large waveguide size is not suitable for on-chip optical interconnection systems

Therefore, the prior art lacks a multi-channel integrated optical waveguide dual-polarization mode multiplexer-demultiplexer that is suitable for on-chip optical interconnection systems and is convenient for coupling connection with few-mode fibers

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