Distributed feedback semiconductor laser

Details Distributed feedback semiconductor laser Distributed feedback semiconductor laser

2006-09-12

2006-09-12

Harvey, Minsun Oh (Department: 2828)

Coherent light generators

Particular active media

Semiconductor

C372S043010

Reexamination Certificate

active

07106772

ABSTRACT:
A tuning layer is disposed spaced by some distance apart from an active layer in a thickness direction, the tuning layer having a transition wavelength shorter than a wavelength of light radiated from the active layer. A diffraction grating layer is disposed between the active layer and tuning layer, a refractive index of the diffraction grating layer being periodically changed along an optical resonator direction. A first electrode supplies the active layer with current. A second electrode supplies the tuning layer with current independently from the current to be supplied to the active layer. A TTG-DFB laser is provided which can maintain a proper coupling coefficient and has characteristics suitable for application to communication light sources.

REFERENCES:
patent: 5425042 (1995-06-01), Nido et al.
patent: 2003/0007765 (2003-01-01), Sato et al.
patent: 2003/0047738 (2003-03-01), Funabashi et al.
patent: 2003324243 (2003-11-01), None
M.-C. Amann et al.; “Tunable twin-guide laser: A novel laser diode with improved tuning performance”;Applied Physics Letters; vol. 54; 1989; pp. 2532-2533./Discussed in the specification.

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