期刊
IEEE JOURNAL OF QUANTUM ELECTRONICS
卷 46, 期 11, 页码 1656-1661出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JQE.2010.2057410
关键词
High index contrast; multimode interference; silicon wire waveguides; waveguide crossings
资金
- National Science Council of Taiwan [NSC 97-2221-E-009-031]
We present a design technique for a compact waveguide crossing by using a 90 multimode-interference (MMI) based waveguide crossing sandwiched by four identical miniaturized tapers where the power of the input guided mode is coupled into even modes of the MMI section at a specific power ratio and with different phases, thereby reducing the dimension of this waveguide crossing with imperceptible loss and crosstalk. Using the finite difference time domain method, we demonstrate that the MMI-based waveguide crossing embedded in short Gaussian tapers has a size 5426 nm x 5426 nm, insertion loss 0.21 dB, and crosstalk -44.4 dB at the wavelength of 1550 nm and broad transmission spectrum ranging from 1500 to 1600 nm.
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