Wide tuning characteristics of double-ring coupled lasers |
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| Authors: | Doo Gun Kim Young-Wan Choi |
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| Institution: | a Photonics Device Team, Korea Photonics Technology Institute, WolChul-dong, Buk-go, Gwangju 500-779, Republic of Korea
b Microwave and Lightwave Telecommunications Laboratory, School of Electrical and Electronics Engineering, Chung-Ang University, 221 Heuksuk-dong, Dongjak-ku, Seoul 156-756, Republic of Korea |
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| Abstract: | The wide tuning characteristics of double-ring coupled lasers with/without an extended waveguide are analyzed and optimized using the scattering matrix formalism. To obtain the optimum design schemes of the tunable laser diodes, the cross coupling ratios of two rings, the tuning enhancement factor, the propagation loss of passive waveguides, the optical gain of an active region, and the back and front-facet reflectivity of the waveguide are taken into account. When the coupling ratio of the ring and input/output waveguides is fixed, the extinction ratio and the linewidth are decreased as the tuning enhancement factor is increased, while the tuning range is increased. |
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| Keywords: | Tunable laser Ring resonator Scattering matrix Transmission matrix |
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