Optical waveguides – With optical coupler – Input/output coupler
Patent
1997-10-20
1998-11-03
Ullah, Akm E.
Optical waveguides
With optical coupler
Input/output coupler
G02B 634
Patent
active
058321543
ABSTRACT:
A width of a core in an optical waveguide is decreased in accordance with a value of a predetermined equation, as a distance of a position of the core to the center position thereof is decreased. Consequently, a rectangular spectrum property having no ripple is obtained on a lower wavelength side in a reflection grating. In addition, the width of the core is changed at the position Z in the direction of light propagation, while a UV light is radiated to the core, so that a periodically striated distribution of refractive indices having an envelope which is changed in accordance with a value of ".vertline.sin (C.multidot.Z).vertline./.vertline.C.multidot.Z.vertline." is formed in the core of the optical waveguide, and a phase of a light to be propagated in the direction of the light propagation is shifted at the position Z as defined below by .pi.. Z=m.pi./C(m= - - - , -3,-2,-1,1,2,3, - - - ) Thus, a rectangular spectrum property is obtained in a low reflection grating.
REFERENCES:
patent: 4830447 (1989-05-01), Kamiyama et al.
patent: 5323477 (1994-06-01), Lebby et al.
patent: 5367588 (1994-11-01), Hill et al.
patent: 5745617 (1988-04-01), Starodubov et al.
Arai Hideaki
Uetsuka Hisato
Hitachi Cable Ltd.
Ullah Akm E.
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