Dynamic magnetic information storage or retrieval – General processing of a digital signal – In specific code or form
Patent
1989-06-28
1991-12-03
Envall, Jr., Roy N.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
In specific code or form
369103, 369109, 369110, 385 14, 385 37, 359571, G11B 700, G11B 2100
Patent
active
050704885
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.
REFERENCES:
patent: 4435041 (1984-03-01), Torok et al.
patent: 4718052 (1988-01-01), Kondo et al.
patent: 4737946 (1988-04-01), Yamashita et al.
patent: 4779259 (1988-10-01), Kono et al.
patent: 4797867 (1989-01-01), Sunagawa et al.
patent: 4842969 (1989-06-01), Kawatsuki
J. H. Harris et al. "Theory & Design of Couplers" Applied Optics 11/10/72 pp. 2234-2240.
T. Tamir & S. T. Peng, "Analysis & Design of Grating Couplers" Appl. Physics 14/77, pp. 235-254.
G. Hatakoshi et al. "Waveguide Grating Lenses for Optical Couplers" Applied Physics, 1984 vol. 23, No. 11, pp. 1749-1753.
M. L. Dakss "Grating Coupler for Efficient Excitation of Optical Guided Waves in Thin Films" in Applied Physics Letters 1970, vol. 16, No. 12.
Arimoto Akira
Fukushima Atsuko
Hira Yasuo
Ito Kenchi
Kawamoto Kazumi
Bui Hung H.
Envall Jr. Roy N.
LandOfFree
Optical integrated circuit and optical apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Optical integrated circuit and optical apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical integrated circuit and optical apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1700834