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Your search keyword '"Ahmed, Moustafa"' showing total 11 results
Start Over Author "Ahmed, Moustafa" Journal japanese journal of applied physics
11 results on '"Ahmed, Moustafa"'

10. Low-polarization dependent thermo-optic phase-shift in slow light Bragg reflector waveguide for beam steering and optical switching.

Author

Fuchida, Ayumi, Matsutani, Akihiro, Ahmed, Moustafa, Bakry, Ahmed, and Koyama, Fumio

Abstract

We demonstrate an electro-thermally tunable phase-shift in a slow-light Bragg reflector waveguide with large waveguide dispersion. The group index and phase shift are measured from the interference fringe between the reflection of input light and the output light in a 20-µm-long slow light waveguide. An electro-thermally tunable phase shift is over π in a compact 20-µm-long waveguide with power consumption below 30 mW. The result shows the low polarization dependence of the phase shift owing to the low polarization dependent group index of the slow-light Bragg reflector waveguide. [ABSTRACT FROM AUTHOR]

Published
2014
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11. Wavelength tuning and controlled temperature dependence in vertical-cavity surface-emitting lasers with a thermally and electrostatically actuated cantilever structure.

Author

Nakahama, Masanori, Sano, Hayato, Inoue, Shunya, Sakaguchi, Takahiro, Matsutani, Akihiro, Ahmed, Moustafa, Bakry, Ahmed, and Koyama, Fumio

Abstract

We demonstrate the wavelength tuning and the control of its temperature dependence in 850 nm GaAs vertical cavity surface emitting lasers (VCSELs) using a thermally and electrostatically actuated cantilever structure. The temperature dependence can be controlled from +0.035 to −0.14 nm/K by changing the length of a micromachined cantilever, which can be electrostatically actuated for wavelength tuning. Continuous wavelength tuning over 36 nm was obtained keeping almost constant temperature dependence. The result indicates a possibility of realizing widely-tunable VCSELs with engineered temperature dependence. [ABSTRACT FROM AUTHOR]

Published
2014
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