| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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An Eight-Channel 400 GHz-Spacing Etched Diffraction Grating Multi/Demultiplexer on a Nanophotonic Silicon-on-Insulator Platform |
| SHEN Ao1, QIU Chen1, HU Ting1, XU Chao1, JIANG Xiao-Qing1,2, LI Yu-Bo1,2**, YANG Jian-Yi1,2** |
1Department of Information Science and Electronics Engineering, Zhejiang University, Hangzhou 310027
2Cyrus Tang Center for Sensor Materials and Applications, Zhejiang University, Hangzhou 310027
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| Cite this article: |
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SHEN Ao, QIU Chen, HU Ting et al 2013 Chin. Phys. Lett. 30 084204 |
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Abstract An eight-channel 400 GHz-spacing planar waveguide multi/demultiplexer employing etched diffraction grating is designed and fabricated on a silicon-on-insulator platform with a 220 nm thick top layer. The design parameters are optimized by scalar diffraction simulation to obtain optimal performance with a small footprint of only 0.75 mm2. A bi-level adiabatic taper is used to connect the input/output waveguide and the slab waveguide so as to reduce the insertion loss and the broadening of the diffraction angle of the propagating light. The device is fabricated in a two-step process with E-beam lithography and dry etching, and the alignment accuracy is 10 nm or even better. Measurements show that the insertion loss is 7.35 dB and the crosstalk between adjacent channels is about ?15 dB. Ways to improve the performance are also investigated in detail.
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Received: 16 May 2013
Published: 21 November 2013
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| PACS: |
42.25.Fx
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(Diffraction and scattering)
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42.79.Dj
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(Gratings)
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42.79.Sz
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(Optical communication systems, multiplexers, and demultiplexers?)
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42.82.Et
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(Waveguides, couplers, and arrays)
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42.82.-m
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(Integrated optics)
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