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Rectangular ring resonator with optimum multimode inteference  

Kim, Doo-Gun (School of Electronics and Electrical Eng., Chung-Ang University)
Choi, Woon-Kyung (School of Electronics and Electrical Eng., Chung-Ang University)
Choi, Young-Wan (School of Electronics and Electrical Eng., Chung-Ang University)
Yi, Jong-Chang (School of Electronics and Electrical Eng., Hong Ik University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SD / v.44, no.11, 2007 , pp. 26-35 More about this Journal
Abstract
We characterized the properties of the fabricated filter with the total internal reflection mirror (TIR) in the rectangular ring resonator and very small multimode interference (MMI) couplers on an InP material platform for photonic integrated circuits. Coupling power in and out of a resonator is increased by using an optimum MMI length of 110 ${\mu}m$ and a width of 9 ${\mu}m$, respectively. The semiconductor optical amplifier with the length of 120 ${\mu}m$ is integrated in the resonator to compensate the loss of the internal waveguide and the TIR mirror. A free spectral range of approximately 2 nm (244 GHz) is observed with an on-off ratio of 13 dB. The curve fitting also yields the power coupled per pass as 42%. To reach critical coupling at this coupling level would require a round trip loss of about 2.4 dB.
Keywords
Total Internal Reflection Mirror; Multimode Interference; Semiconductor Optical Amplifier; Rectangular Ring Resonator;
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