G - Physics – 02 – F
Patent
G - Physics
02
F
G02F 1/01 (2006.01) G11B 7/12 (2006.01)
Patent
CA 2098957
WAVEGUIDE OPTICAL PICK-UP HEAD USING MACH-ZEHNDER INTERFEROMETER WAVEFRONT SENSOR APPARATUS AND METHOD ABSTRACT OF THE DISCLOSURE An integrated optic head contains a planar and channel waveguides, a waveguide condensing lens, and integrated waveguide photodetectors. The main portion of the beam returning from the disk is focused by the lens onto an integrated waveguide photodetector to provide the data signal. A smaller portion of the beam is sampled by channel waveguide Mach-Zehnder (MZ) interferometers that measure the beam wavefront curvature to provide the focus error signal (FES). Additional channel waveguides provide reference signals for the interferometers and provide a means of measuring the tracking error signal (TES). The TES method includes subtracting light detected by one channel waveguide detector from light detected by another, which difference is the tracking error. The FES method includes obtaining the difference in the ratios of the light emanating from two interferometers divided by the light emanating from their respective channel waveguides, which difference in ratios is the focus error.
Eastman Kodak Company
Gowling Lafleur Henderson Llp
LandOfFree
Waveguide optical pick-up head using mach-zehnder... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Waveguide optical pick-up head using mach-zehnder..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Waveguide optical pick-up head using mach-zehnder... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1807796