Journal
OPTICS LETTERS
Volume 43, Issue 15, Pages 3766-3769Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.43.003766
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Funding
- National Natural Science Foundation of China (NSFC) [11774235, 61705130]
- Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning, Natural Science Foundation of Shanghai [17ZR1443400]
- Open Fund of the Key Laboratory of Astronomical Optics Technology, CAS [CAS-KLAOT-KF201703]
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A vertically integrated waveguide self-coupled resonator based tunable optical filter was demonstrated. Unlike the conventional U-bend self-coupled waveguide structure, a top-layer S-bend waveguide was cross-coupled with the racetrack resonator on a bottom layer. The different waveguide coupling effect was compared with the same resonance structure, which can realize the same free spectral range as well as a high quality factor. Spectrum response can be designed separately by varying the coupling coefficient between waveguide and resonator. A heater attached on the top of the resonator can be utilized for the resonance wavelength tuning, while a heater on the top of crosscoupled waveguide has little influence on the device performance, which can help to improve the stability. The presented device can also be applied as a tunable modulator/switch. (C) 2018 Optical Society of America
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