| 1. |
- Huang, Qiangsheng, et al.
(författare)
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Experimental Demonstration of Single Mode-Splitting in Microring With Bragg Gratings
- 2015
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Ingår i: IEEE Photonics Technology Letters. - 1041-1135 .- 1941-0174. ; 27:13, s. 1402-1405
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Tidskriftsartikel (refereegranskat)abstract
- We demonstrate single mode-splitting in two types of microring resonators with Bragg gratings. In the first device type, gratings are periodically embedded to the inner wall of the microring resonator. By adjusting the reflection coefficient of the grating and the self-coupling coefficient between the waveguide and microring, experimental results show that the distance between the splitting dips can vary from 0 to more than 1 nm. In the second device type, Bragg gratings break into two identical parts with a pi phase shift between them. The center peak in the mode-splitting spectrum has a full-width at half-maximum of 0.1 nm. The spectra can also be a Fano-type transmission, when the phase shift deviates from pi.
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| 2. |
- Huang, Qiangsheng, et al.
(författare)
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FSR-free filter based on a coupled microring grating system
- 2015
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Ingår i: Optical Fiber Communication Conference, OFC 2015. - Washington, D.C. : Optical Society of America.
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Konferensbidrag (refereegranskat)abstract
- A coupled microring grating system is theoretically and experimentally demonstrated. It can be used as a no free spectral range filter, with an extinction ratio larger than 25dB and a 3dB bandwidth of 0.8nm.
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| 3. |
- Huang, Qiangsheng, et al.
(författare)
-
Ultracompact tapered coupler for the Si/III-V heterogeneous integration
- 2015
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Ingår i: Applied Optics. - 1559-128X .- 2155-3165. ; 54:14, s. 4327-4332
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Tidskriftsartikel (refereegranskat)abstract
- An ultracompact tapered coupler, which is suitable for mode transformation between a 220 nm high silicon wire waveguide and a Si/III-V hybrid waveguide, is proposed for Si/III-V heterogeneous integration. The tapered coupler is composed of three sections. Since the tapered coupler avoids exciting the unwanted high-order modes in the III-V waveguide, the length of the tapered coupler can be dramatically shortened. In the proposed structure, the total length of the trisectional tapered coupler can be as short as 8 mu m with a fundamental mode-coupling efficiency of over 95% in a bandwidth of over 100 nm. The alignment tolerance of the proposed structure is also analyzed.
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