Integrated-optic double-ring resonators with a wide free spectralrange of 100 GHz |
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Authors: | Suzuki S. Oda K. Hibino Y. |
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Affiliation: | NTT Opto-Electron. Labs., Ibaraki; |
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Abstract: | Integrated-optic double-ring resonators with a wide free spectral range (FSR) of 100 GHz are fabricated using GeO2-doped silica waveguides with a high relative refractive index difference (Δ) of 1.5%. The resonators are composed of two ring resonators comprising small ring waveguides with radii of 1.75 and 2.0 mm. The double-ring resonator module exhibited a wide FSR of 98.0 GHz, a finesse of higher than 138, a low crosstalk of less than -11.7 dB, and a low insertion loss of 6.1 dB. The measured FSR of 98.0 GHz is wider than any previously reported ring resonator composed of optical waveguides |
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