Integrated electro-optic modulator structure for coherent optical communication

Abstract

Disclosed is an integrated coherent-light-communication electro-optical modulator structure which comprises a light beam splitter, four electro-optical modulators, two light beam combiners, a polarization rotator and a polarization beam combiner. The light beam splitter is provided with an input port, a multimode waveguide region and four output ports, wherein light intensities of light fields output by the four output ports are equal, and difference of two outside phases outputting light fields and two middle phases outputting light fields is 90 degrees; input ports of the four electro-optical modulators are connected with four output ports of the light beam splitter; each light beam combiner is provided with two input ports, a multimode waveguide region and an output port, wherein the input port of each light beam combiner is connected with output ports of two electro-optical modulators on one side of the four electro-optical modulators; the input port of the polarization rotator is connected with the output ports of the light beam combiners; and one input port of the polarization beam combiner is connected with the output port of one polarization rotator, and the other input port of the polarization is connected with the other output port of the two light beam combiners.

Description

technical field [0001] The invention relates to the technical field of optical fiber communication, in particular to an integrated electro-optical modulator structure for coherent optical communication. Background technique [0002] In recent years, with the popularity of new services such as high-quality video, social network services, and cloud storage, and the continuous promotion of high-speed and large-capacity access networks, the demand for bandwidth of transmission equipment and communication links in telecommunications networks has shown a trend of continuous and rapid growth. The 100G coherent communication system based on the polarization multiplexed quadrature phase shift keying (DP-QPSK, Dual Polarization Quadrature PhaseShift Keying) modulation format has gradually moved from the laboratory to commercial use. The higher-speed next-generation 400G technology has attracted widespread attention in the industry, and the use of advanced modulation formats with highe...

AI Technical Summary

Problems solved by technology

[0010] The main purpose of the present invention is to provide an integrated electro-optic modulator structure for coherent optical communication. The optical beam splitter realizes the 90-degree phase shift function required by the electro-optic modulator while splitting light, which can solve the problem of traditional coherent optical modulator. The problem of low optical bandwidth of the phase shifter in the electro-optical modulator for optical communication achieves the purpose of reducing the difficulty of designing and implementing the optical transmitter in coherent optical communication, and has the advantages of small size, low power consumption, low cost and high stability

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