Coherent light generators – Particular active media – Semiconductor
Patent
1990-06-13
1992-06-02
Epps, Georgia Y.
Coherent light generators
Particular active media
Semiconductor
372 20, 372 33, 372 45, 372 46, 372 96, 372 98, 372102, H01S 319
Patent
active
051193930
ABSTRACT:
A wavelength-tunable semiconductor laser device presenting a large wavelength-tunable range or a very-high-speed modulating semiconductor laser device having a distributed feedback structure including a diffraction grating as in the case of a DBR laser or a DFB laser incorporates therein a plurality of active layers differing from one another in constituent elements or composition ratio or thickness for reducing spectral line widths, while improving single-mode spectral oscillation characteristics.
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Chinone Naoki
Ohtoshi Tsukuru
Oka Akihiko
Okai Makoto
Sakano Shinji
Epps Georgia Y.
Hitachi , Ltd.
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