Abstract

Using a conventional microwave photonic technique, we demonstrate lightwave switching in laterally coupled GaAs-AlGaAs microring resonators by free carrier injection. The ring waveguide is optically pumped just above its bandgap energy, which results in a temporal tuning of the microring resonant wavelengths by the refractive index change due to the induced free carriers. Both the transmission and the phase function of the resonators are investigated and used to demonstrate all-optical switching. The switching time, limited by surface recombination of carriers, is 20 ps. A switching energy of a few picojoules shifts the microring resonance by 1.2 nm.

© 2003 IEEE

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Opt. Lett. (3)

Other (10)

S. M. Sze, Physics of Semiconductor Devices, 2nd ed. New York: Wiley, 1981.

M. Yairi and D. Miller, "Equivalence of diffusive conduction and giant ambipolar diffusion", J. Appl. Phys., vol. 91, pp. 4374-4381, Apr. 2002.

S. T. Ho, C. E. Soccolich, M. N. Islam, W. S. Hobson, A. F. J. Levi and R. E. Slusher, "Large nonlinear phase shifts in low-loss AlxGa1-xAs waveguides near half-gap", Appl. Phys. Lett., vol. 59, pp. 2558-2560, Nov. 1991.

V. Van, T. A. Ibrahim, K. Ritter, P. P. Absil, F. G. Johnson, R. Grover, J. Goldhar and P.-T. Ho, "All-optical nonlinear switching in GaAs-AlGaAs microring resonators", IEEE Photon. Technol. Lett., vol. 14, pp. 74-76, Jan. 2002.

C. H. Lee, Picosecond Optoelectronic Devices, London: U.K.: Academic, 1984.

C. H. Lee, P. S. Mak and A. P. DeFonzo, "Optical control of millimeter-wave propagation in dielectric waveguides", IEEE J. Quantum Electron., vol. QE-16, pp. 277-287, Mar. 1980 .

A. M. Yurek, C. D. Striffler and C. H. Lee, "Optoelectronic devices for millimeter waves," in Infrared and Millimeter Waves, K. J. Button, Ed. New York: Academic, 1985,vol. 14,ch. 4, pp. 249-290.

K. Djordjev, S.-J. Choi, S.-J. Choi and P. D. Dapkus, "Microdisk tunable resonant filters and switches", IEEE Photon. Technol. Lett., vol. 14, pp. 828-830, June 2002.

J. V. Hryniewicz, P. P. Absil, B. E. Little, R. A. Wilson and P.-T. Ho, "Higher order filter response in coupled micro-ring resonators", IEEE Photon. Technol. Lett., vol. 12, pp. 320 -322, Mar. 2000.

P. P. Absil, J. V. Hryniewicz, B. E. Little, R. A. Wilson, L. G. Joneckis and P.-T. Ho, "Compact microring notch filters", IEEE Photon. Technol. Lett., vol. 12, pp. 398-400, Apr. 2000.

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