Polarization beam splitter rotator and design method thereof

Abstract

The invention provides a polarization beam splitter rotator and a design method thereof. The polarization beam splitter includes a double-layer trapezoidal mode converter and a reverse tapered coupler which are connected in series; the double-layer trapezoidal mode converter converts a transverse magnetic wave zero-order mode into a transverse electric wave first-order mode, and the reverse tapered coupler converts the transverse electric wave first-order mode into a transverse electric wave zero-order mode. The width of a first trapezoidal waveguide and a second trapezoidal waveguide is selected, and according to a relation between waveguide length and mode conversion efficiency, the length of the first trapezoidal waveguide and the second trapezoidal waveguide is determined; and the width of a third trapezoidal waveguide and a fourth trapezoidal waveguide is selected, and according to a relation between the waveguide length and mode conversion loss, the length of the reverse tapered coupler is determined. Characteristics of large working bandwidth, high conversion efficiency and high manufacturing tolerance and the like are realized through parameter optimization, the polarization beam splitter rotator can be used for improving practicability of a single-fiber three-way multiplexer, in addition, a manufacturing method is simple, is compatible with a standard silicon photon processing technological process, and the polarization beam splitter rotator and the design method thereof have relatively high practical value and good application prospects.

Description

technical field [0001] The invention relates to the technical field of optical communication, in particular to a polarization beam splitting rotator and a design method thereof. Background technique [0002] In recent years, with the rapid development of broadband access networks, broadband has become the most prominent feature of the development of access networks. High-bandwidth services such as video on demand, Internet TV (IPTV) and online games are gradually regarded as new business growth points by telecom operators and radio and television operators. Symmetrical Digital Subscriber Loop (ADSL)-based broadband access methods have been difficult to meet users' requirements for high bandwidth, bidirectional transmission capabilities, and security. Faced with this dilemma, telecom operators in various countries have turned their attention to Fiber To The Home (FTTH, FiberToTheHome) technology. Fiber-to-the-home technology can meet the high-bandwidth requirements of compr...

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Problems solved by technology

[0006] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a polarization splitting rotator and its design method, which are used to solve the polarization sensitivity of the single-fiber three-way multiplexer in the fiber-to-the-home system in the prior art. The problem of coupling with sex and large bandwidth

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