Optical waveguides – With optical coupler – Input/output coupler
Patent
1994-06-02
1995-11-28
Bovernick, Rodney B.
Optical waveguides
With optical coupler
Input/output coupler
385 14, 369 4411, 369 4412, G11B 700, G02B 634
Patent
active
054715482
ABSTRACT:
An apparatus and method for detecting focus and tracking error signals and monitoring pointing in an optical device wherein a return beam of light undergoes changes in angle and collimation in response to changes in focus and tracking are provided. A waveguide device includes a substrate having a surface, a waveguide layer on the surface having segments of different thicknesses for adjusting an effective refractive index of each segment, a cladding contacting the waveguide layer with the waveguide layer positioned between the substrate and the cladding, and a linear input coupling grating for input coupling the return beam. The grating includes a processing grating to input couple light to effect a desired change in input coupled intensity with defocus or detracking, an isolation grating for decoupling light scattered within the waveguide, and an interchip grating to couple light already processed to focus and tracking detectors. The grating and detectors are used to generate focus error signals, tracking error signals, and pointing error signals.
REFERENCES:
patent: 4758062 (1988-07-01), Sunagawa et al.
patent: 4833561 (1989-05-01), Sunagawa et al.
patent: 4868803 (1989-09-01), Sunagawa et al.
patent: 4885732 (1989-12-01), Sunagawa et al.
patent: 4923300 (1990-05-01), Michel et al.
patent: 4991919 (1991-02-01), Nishiwaki et al.
patent: 5044718 (1991-09-01), Kando
patent: 5081615 (1992-01-01), Sunagawa
patent: 5105403 (1992-04-01), Kando et al.
patent: 5153860 (1992-10-01), Sunagawa et al.
patent: 5159650 (1992-10-01), Nishiwaki et al.
patent: 5208800 (1993-05-01), Isobe et al.
patent: 5235581 (1993-08-01), Miyugawa et al.
Shogo et al., An Integrated-Optic Disk Pickup Device, Journal of Lightwave Technology, vol. LT-4, No. 7, Jul. 1986.
Bovernick Rodney B.
Eastman Kodak Company
Owens Raymond L.
Sanghavi Hemang
LandOfFree
Segmented waveguide gratings used as optical recording sensors does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Segmented waveguide gratings used as optical recording sensors, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Segmented waveguide gratings used as optical recording sensors will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2019706