US 5,070,488 A · Optical integrated circuit and optical apparatus

Abstract

An optical integrated circuit and an optical apparatus used in optical communication or an opto-electronics apparatus such as an optical disk recording apparatus, in which various kinds of aberration caused by wavelength variation of a light source when a semiconductor laser is used as the light source. An aberration correcting grating having such grating pitches as to nearly satisfy the Bragg condition preferably with respect to a certain wavelength of the semiconductor laser beam is used. As a result, lowering of incidence (entrance) and radiation (exit) coupling efficiencies of the grating coupler and aberration such as chromatic aberration can be prevented. Even if a multi-mode semiconductor laser is used as a light source, the characteristics of the optical integrated circuit and optical apparatus do not vary largely.

Claims24

Dependent claims

An optical apparatus comprising:

an optical waveguide disposed with respect to a surface of a substrate for propagating a laser beam therealong;
grating coupler means formed on the optical waveguide for enabling at least one of coupling of the laser beam to the optical waveguide as an input laser beam and coupling of the laser beam from the optical waveguide as an output laser beam;
and
aberration correction grating means disposed with respect to the grating coupler means for enabling at least one of aberration correction of the input laser beam to the grating coupler means and aberration correction of the output laser beam from the grating coupler means.

1 more element

Dependencies are inferred from the claim text.

Optical integrated circuit and optical apparatus

Life of this patent

Optical integrated circuit and optical apparatus

Life of this patent

Abstract

Claims24