Coherent light generators – Particular resonant cavity – Distributed feedback
Patent
1993-03-03
1994-06-28
Davie, James W.
Coherent light generators
Particular resonant cavity
Distributed feedback
372 20, 372 46, 372 50, 385 14, H01S 310
Patent
active
053253922
ABSTRACT:
The distributed reflector includes a substrate and at least one optical waveguide formed on the substrate and having a refractive index larger than the substrate and at least one optical confinement layer having a refractive index smaller than the optical waveguide layer. A diffractive grating is formed in at least one layer constituting the optical waveguide. The diffractive grating has a structure of which at least one parameter defining optical reflectivity varies depending on its position, and is formed continuously for at least two periods, the period being approximately defined by the length of repeating unit region. The parameter may be pitch, coupling coefficient, bandgap composition, phase shift, etc. The semiconductor laser includes the distributed reflector which may be of a distributed reflector type or distributed feed back type and has distributed reflector regions and a phase adjustment region. Application of current or voltage to the refractive index of the active region or inactive region in which a diffractive grating is present or absent adjusts the refractive index thereof and enables coarse and fine adjustment of lasing wavelength.
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Ishii Hiroyuki
Kano Fumiyoshi
Tamamura Toshiaki
Tohmori Yuichi
Davie James W.
Nippon Telegraph and Telephone Corporation
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