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Journal of Lightwave Technology

Journal of Lightwave Technology


  • Vol. 16, Iss. 8 — Aug. 1, 1998
  • pp: 1447–

An Integrated Two-Stage Cascaded Mach-Zehnder Device in GaAs

M. H. Hu, Zhengyu (Johnny) Huang, K. L. Hall, Robert Scarmozzino, and Richard M. Osgood Jr.

Journal of Lightwave Technology, Vol. 16, Issue 8, pp. 1447- (1998)

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An integrated, cascaded, asymmetric GaAs/AlGaAs Mach-Zehnder (MZ) interferometer, for use in wavelength filtering and time-domain multiplexing, has been designed, fabricated, and tested. This device employs several new passive components, including height-tapered Y-branches, for uniform splitting and recombining, and index-tailored waveguide bends, for low-loss operation. The waveguide bend is designed with a predistorted index profile for minimizing both transition loss and radiation loss. The circuit is fabricated with a resistless, light-induced local etching technique, which enables rapid iterative fabrication of the device geometry to achieve the desired operating path delays. Acting as a wavelength filter, the fabricated device has a {-}24.3 dB minimum-to-maximum extinction ratio and a {-}10.5 dB side-lobe suppression ratio. Acting as a pulse-rate multiplexer, the device generates a four-pulse train with a 10-ps pulse-to-pulse separation and an amplitude uniformity of 80% for each input pulse.


M. H. Hu, Zhengyu (Johnny) Huang, K. L. Hall, Robert Scarmozzino, and Richard M. Osgood Jr., "An Integrated Two-Stage Cascaded Mach-Zehnder Device in GaAs," J. Lightwave Technol. 16, 1447- (1998)

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