Abstract
A two-port polarization-insensitive single-mode fiber-silicon wire-waveguide coupler module, 5.3 × 3.4 × 0.7 mm(3) in size, is realized. The spot-size converter (SSC) involved utilizes a concatenated horizontal up-taper and vertical down-taper. Measured coupling losses between the fiber and the silicon-wire waveguide of the E(11)(y) and E(11)(x) modes of the SSC are 2.8 and 2.7 dB/port, respectively. The device platform is planar, robust, and easy to fabricate with conventional lithography.
Highlights
Silicon-based photonic nano-wire waveguide structures may lead to monolithic integration among electronic, optoelectronic and optical devices
The device platform is planar, robust, and easy to fabricate with conventional lithography
The proposed polarization-insensitive spot-size converter (SSC) possesses desirable features of planar geometry, robustness, simplicity in design, requiring relatively small number of processing steps in fabrication, and requiring no anti-reflection coating for its endface
Summary
Silicon-based photonic nano-wire waveguide structures may lead to monolithic integration among electronic, optoelectronic and optical devices. The resulting integrated optoelectronic circuits together with single-mode fibers (SMFs) will facilitate a variety of applications. The great disparity between the mode-field diameters (MFDs) of the SMFs and that of the Si-wire waveguides will result in excessive coupling losses when they are directly butt coupled. Vertical expansion of MFD in the waveguides is well-recognized to be much more difficult to accomplish. It is highly desirable for the SSCs be polarization insensitive [3, 6, 13]. We report realization of a two-port polarization-insensitive single-mode fiber-silicon wire waveguide coupler module that employs SSCs of new configuration in a silicon-on-insulator (SOI) substrate
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