
1.Department of Electrical and Computer Engineering, University of California, Santa Barbara, CA 93106, USA
2.Centre for Optical and Electromagnetic Research, State Key Laboratory for Modern Optical Instrumentation, Zhejiang University, Zijingang, Hangzhou 310058, China
Professor DX Dai, Department of Electrical and Computer Engineering, University of California, Santa Barbara, CA 93106, USA. E-mail: dxdai@zju.edu.cn
Professor JE Bowers, Department of Electrical and Computer Engineering, University of California, Santa Barbara, CA 93106, USA. E-mail: bowers@ece.ucsb.edu
Published:2012-03,
Published Online:29 March 2012,
Received:12 January 2012,
Revised:16 February 2012,
Accepted:17 February 2012
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Dai, D. X., Bauters, J. & Bowers, J. E. Passive technologies for future large-scale photonic integrated circuits on silicon: polarization handling, light non-reciprocity and loss reduction. Light: Science & Applications, 1, e1 (2012).
Dai, D. X., Bauters, J. & Bowers, J. E. Passive technologies for future large-scale photonic integrated circuits on silicon: polarization handling, light non-reciprocity and loss reduction. Light: Science & Applications, 1, e1 (2012). DOI: 10.1038/lsa.2012.1.
Silicon-based large-scale photonic integrated circuits are becoming important
due to the need for higher complexity and lower cost for optical transmitters
receivers and optical buffers. In this paper
passive technologies for large-scale photonic integrated circuits are described
including polarization handling
light non-reciprocity and loss reduction. The design rule for polarization beam splitters based on asymmetrical directional couplers is summarized and several novel designs for ultra-short polarization beam splitters are reviewed. A novel concept for realizing a polarization splitter–rotator is presented with a very simple fabrication process. Realization of silicon-based light non-reciprocity devices (e.g.
optical isolator)
which is very important for transmitters to avoid sensitivity to reflections
is also demonstrated with the help of magneto-optical material by the bonding technology. Low-loss waveguides are another important technology for large-scale photonic integrated circuits. Ultra-low loss optical waveguides are achieved by designing a Si
3
N
4
core with a very high aspect ratio. The loss is reduced further to
<
0.1 dB m
−1
with
an improved fabrication process incorporating a high-quality thermal oxide upper cladding by means of wafer bonding. With the developed ultra-low loss Si
3
N
4
optical waveguides
some devices are also demonstrated
including ultra-high-Q ring resonators
low-loss arrayed-waveguide grating (de)multiplexers
and high-extinction-ratio polarizers.
integrationlow lossnon-reciprocalpolarizationsilicon
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