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Polarization-independent waveguide modulator using a novel quantum well with mass-dependent width

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5 Author(s)
Yamaguchi, T. ; Dept. of Electron. Eng., Tokyo Univ., Japan ; Morimoto, T. ; Akeura, K. ; Tada, K.
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We propose a novel quantum well (QW) structure with two or four thin barriers inserted in which effective width of the well is mass-dependent. It is very useful for polarization-independent optical modulation. Incorporation of tensile strain is also discussed for further improvement of the polarization insensitivity. Fabrication of a modulator with lattice-matched QW's results in 6-V switching voltage with more than -10-dB extinction (--30 dB maximum) for both TE and TM modes over 29-nm wavelength range. Compared with the quasiparabolic QW, this new quantum well has better fabrication tolerance, wider wavelength range of operation, and higher yield.<>

Published in:

Photonics Technology Letters, IEEE  (Volume:6 ,  Issue: 12 )