Tunable Optical Waveguide Resonators

1. Tunable Optical Waveguide Resonators Yin Xi State Key Lab of Advanced Optical Communication Systems and Networks, Department of Electronic Engineering, Shanghai Jiao Tong University, China

2. OUTLINE • Advantages of silicon photonics • Self-coupled optical waveguide • Tunable Two-Stage Self-Coupled Optical Waveguide (SCOW) Resonators

3. Advantages of silicon photonics

4. Self-coupled optical waveguide(SCOW) Given this simple structure and its large group index variation, the induced Electromagnetically induced transparency (EIT) can find potential applications in reconfigurable delay lines and nonlinear signal processing. Ref:Linjie Zhou, etc., Vol. 36, No. 1, OPTICS LETTERS,2011.

5. Tunable Two-Stage Self-Coupled Optical Waveguide (SCOW) Resonators Ref: Zhi Zou, etc., Optical Fiber Communication Conference (OFC) 2013 paper: OTu3C.6

6. Tunable Two-Stage Self-Coupled Optical Waveguide (SCOW) Resonators Fig. 1 The structure of the Two-Stage Self-Coupled Optical Waveguide (SCOW) Resonators Fig. 2 Transmission spectra of the two-stage SCOW resonators. The coupling lengths in the individual SCOW resonators are (a) Lc1 = 6 μm, Lc2 = 10 μm, and (b) Lc1 = 8 μm, Lc2 = 12 μm. As shown in Fig. 2(b). The FWHM of the sharp dip is 0.12 nm, corresponding to a quality factor of ~13,000. The extinction ratio of the dip is ~29 dB. In this case, the cascaded SCOW resonators can be used as high-order bandstop filters. Ref: Zhi Zou, etc., Optical Fiber Communication Conference (OFC) 2013 paper: OTu3C.6

7. Tunable Two-Stage Self-Coupled Optical Waveguide (SCOW) Resonators We can see that with 0.57 mW tuning power, the bottom ripple at 1556.2 nm resonance wavelength is minimized to 1.1 dB, thus a flat-bottom bandstop optical filter with a high extinction ratio (>25 dB) is realized. Ref: Zhi Zou, etc., Optical Fiber Communication Conference (OFC) 2013 paper: OTu3C.6

8. Thank you for your attention