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Reducing Insertion Loss of Photonic Crystal Couplers by Suppressing the Remained Power |
| MAO Xiao-Yu;WANG Jian-Feng;HUANG Yi-Dong;ZHANG Wei;PENG Jiang-De |
| Department of Electronics Engineering, Tsinghua University, Beijing 100084 |
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| Cite this article: |
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MAO Xiao-Yu, WANG Jian-Feng, HUANG Yi-Dong et al 2007 Chin. Phys. Lett. 24 454-457 |
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Abstract We find that the increasing coupling strength can lead to a decreasing density of power inside the waveguide of a photonic crystal waveguide (PC-WG) directional coupler, which is called the mode power remaining phenomenon. This phenomenon is detrimental to achieving low insertion loss of the coupler. An improved structure of the PC-WG directional coupler is proposed by simply increasing the radii of air holes in the post coupling region. The simulation results demonstrate that the insertion loss can be reduced dramatically by suppressing the remained power, and therefore both the short coupling length (8μm) and low insertion loss (lower than 0.5dB) can be obtained.
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| Keywords:
42.70.Qs
78.20.Bh
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Received: 01 September 2006
Published: 24 February 2007
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| PACS: |
42.70.Qs
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(Photonic bandgap materials)
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78.20.Bh
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(Theory, models, and numerical simulation)
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