Andrew J Daiber

US Patent:

6540397, Apr 1, 2003

Filed:

Apr 5, 2001

Appl. No.:

09/828693

Inventors:

Jiro Yoshinari - Tokyo, JP
Takuya Tsukagoshi - Tokyo, JP
Hideki Hirata - Tokyo, JP
Naoki Hayashida - Tokyo, JP
Tokuyuki Honda - Mountain View CA
Mark E. McDonald - Milpitas CA
Michael V. Morelli - San Jose CA
Andrew J. Daiber - Palo Alto CA
Sanjoy Ghose - Scotts Valley CA
Lambertus Hesselink - Atherton CA
Shunichi Nishimura - Milpitas CA
Sergei Sochava - Sunnyvale CA

Assignee:

Siro Technologies, Inc. - San Jose CA
TDK Corporation - Tokyo

International Classification:

G04B 3700

US Classification:

368286, 3692753, 369284

Abstract:

An optical information medium comprising at least two data layers for bearing recorded information, and a servo layer for bearing tracking servo, information which is independently formed from the data layers; wherein the medium is used with a recording or reading system wherein a data beam for recording or reading the data in the data layer and a servo beam for reading the tracking servo information in the servo layer are used, and the servo layer is read by the servo beam that had passed through the data layer; and a filter layer is disposed between the data layer and the servo layer, and the filter layer exhibits higher absorption to the data beam than to the servo beam.

US Patent:

6549664, Apr 15, 2003

Filed:

Jun 30, 1999

Appl. No.:

09/343933

Inventors:

Andrew J. Daiber - Palo Alto CA
Robert R. McLeod - Morgan Hill CA
Ray Snyder - San Francisco CA

Assignee:

Siros Technologies, Inc. - Davis CA

International Classification:

G06K 936

US Classification:

382232, 359 1, 359 3

Abstract:

A method for storing data in a holographic storage medium comprises the steps of dividing a bit stream of binary data into data groups, encoding the data groups as binary patterns, and storing the binary patterns holographically as data pages. Each binary pattern comprises channel bits, wherein the number of âoffâ channel bits is greater than the number of âonâ channel bits. To retrieve information from the storage medium, the medium is illuminated and resultant light signals are gathered. The light signals are converted to the binary patterns, and the binary patterns are converted to the data groups. Binary patterns stored in the storage medium only slightly perturb subsequent reading and writing of data, since the patterns have fewer âonâ channel bits than âoffâ channel bits.

US Patent:

6563779, May 13, 2003

Filed:

Jun 15, 2000

Appl. No.:

09/595433

Inventors:

Mark E. McDonald - Mountain View CA
Robert R. McLeod - Morgan Hill CA
Andrew J. Daiber - Palo Alto CA

Assignee:

Siros Technologies, Inc. - Davis CA

International Classification:

G11B 700

US Classification:

369103, 369118

Abstract:

A tracking error signal generation apparatus and method which utilizes confocal detection with a split detector and a differencing circuit for generation of tracking error signals. A first lens is positioned in the path of a light beam returning from an optical medium. A pinhole is positioned in the path of the light beam after the first lens and proximate to the focal plane of the first lens. A second lens is positioned in the path of the light beam after the pinhole, and a split detector, having equal halves is positioned in the path of the light beam after the second lens. A differencing circuit is operatively coupled to each of the halves of the split detector. In operation, a light beam is focused by an optical head onto a track in the optical medium, and the reflection of the beam from the optical medium is directed through the first lens, through the pinhole, through the second lens, and onto the split detector. When the focus of the light beam is centered on the track, the reflected light reaching the split detector is evenly distributed on the two halves of the detector, such that the differencing circuit will generate a tracking error signal (TES) having nominally a zero value. When the focus of the light beam is off-center with respect to the track, the reflected light received by detector is unevenly distributed on the two halves of the detector such that the differencing circuit generates a non-zero tracking error signal, which will be of positive or negative value depending upon the direction off-center of the light beam focus spot.

US Patent:

6574174, Jun 3, 2003

Filed:

Apr 15, 2000

Appl. No.:

09/549075

Inventors:

James R. Amble - Redwood City CA
Mark E. McDonald - Milpitas CA
Michael V. Morelli - San Jose CA
Andrew J. Daiber - Palo Alto CA
Herman A. Ferrier - Scotts Valley CA
Sanjoy Ghose - Scotts Valley CA
Thomas A. Kridl - Los Altos CA
Matthew Lipson - Sunnyvale CA
Shunichi Nishimura - Tokyo, JP
Sergei Sochava - Sunnyvale CA
LeRoy A. Volz - San Jose CA

Assignee:

Siros Technologies, Inc. - Davis CA

International Classification:

G11B 700

US Classification:

369 4426, 369 4437, 369 94

Abstract:

An optical information storage system using optical storage media including multiple data layers or stacks wherein each of the multiple data stacks has a storage density comparable to a conventional single layer optical disk. The optical data storage system comprises an optical medium having a single dedicated servo layer and multiple data stacks which each contain an embedded servo format, a servo laser beam positioned to maintain a first focus point on the dedicated servo reference layer, a read-write laser beam positioned to maintain a second focus point on one of the data stacks, a first, dedicated servo system which provides focus and tracking error correction according to error signals generated from the dedicated servo layer, and a second, embedded servo system which provides focus and tracking error correction according to error signals generated from the data stacks. The dedicated servo layer, in different embodiments of the invention, may be positioned either below or above the data stacks in the optical medium, or interposed between data stacks. The data stacks may comprise discrete physical data layers or âvirtualâ data layers defined by a format hologram.

US Patent:

6661814, Dec 9, 2003

Filed:

Dec 31, 2002

Appl. No.:

10/335628

Inventors:

William B. Chapman - Sunnyvale CA
Andrew Daiber - Palo Alto CA
Hua Li - Fremont CA
Mark McDonald - Milpitis CA

Assignee:

Intel Corporation - Santa Clara CA

International Classification:

H01S 330

US Classification:

372 6, 372 9, 372 28, 372 92, 385 15, 385 24, 385 39, 359110

Abstract:

Method and apparatus for producing a laser output having stimulated Brillouin scattering (SBS) suppression characteristics. An excitation signal is provided to an optical path length adjustment element in an external cavity laser to modulate the optical path length of the cavity. This produces a laser output having a wavelength modulation frequency and line width that are a function of the frequency and amplitude of the excitation signal. Under appropriate modulation frequency and line width combinations, the laser output comprises an optical signal with SBS suppression characteristics, thus enabling a higher power signal to be launched into a fiber link since the SBS suppression characteristics raise the SBS threshold of the link. The optical path length modulation also produces an intensity (amplitude) modulation in the laser output. A detector is employed to produce a feedback signal indicative of the intensity modulation that is used for tuning the laser in accordance with a wavelength locking servo loop.

US Patent:

6661815, Dec 9, 2003

Filed:

Dec 31, 2002

Appl. No.:

10/335684

Inventors:

William J. Kozlovsky - Sunnyvale CA
Andrew Daiber - Emerald Hills CA
Doug Sprock - San Jose CA
Mark S. Rice - San Jose CA
Rob Carney - Belmont CA

Assignee:

Intel Corporation - Santa Clara CA

International Classification:

H01S 313

US Classification:

372 20, 372 3808, 372 32, 372 29011, 372 28, 372 26, 372 31, 372 92

Abstract:

A servo technique for concurrently providing wavelength locking and stimulated Brillouin scattering (SBS) suppression in an external cavity laser. Respective wavelength locking and SBS suppression signals are generated by a controller and combined into a composite drive signal. The composite drive signal is used to drive an optical path length adjustment element to modulate the optical path length of the laser cavity. The wavelength locking and SBS suppression portions of the drive signals produce concurrent modulations of the laser optical path length having different modulation frequencies and causing different frequency (wavelength) excursions. These modulations produce corresponding wavelength and intensity amplitude modulations in the lasers output. A feedback signal indicative of the intensity amplitude modulations is filtered to attenuate the portion of the signal due to the SBS suppression modulation, and is received as a tuning feedback signal by the controller. In response, the control provides a tuning adjustment signal to adjust the frequency of the laser.

US Patent:

6665321, Dec 16, 2003

Filed:

Dec 31, 2002

Appl. No.:

10/335815

Inventors:

Sergei L. Sochava - Sunnyvale CA
Andrew Daiber - Redwood City CA
Mark McDonald - Milpitis CA

Assignee:

Intel Corporation - Santa Clara CA

International Classification:

H01S 310

US Classification:

372 20, 372 23, 372 19, 372 98, 372 64, 372 92, 372 32, 372 29023

Abstract:

A method for selecting free spectral ranges (FSR) of intra-cavity optics to optimize reliability of the channel switching mechanism and corresponding apparatus. In particular, the optimal relationship between the FSR of the internal etalon and the FSR of the laser cavity is derived. For the external cavity diode lasers (ECDL) the optimal relationship between the FSR of the internal etalon and the FSR of the gain chip is also derived. Equations are derived for selecting free spectral ranges of various optical cavities so as to create a locally commensurate condition under which the relative position of the lasing mode with respect to the transmission peak of the lasers tunable filter (e. g. , etalon plus channel selector) does not change when the laser hops between adjacent channels.

US Patent:

6687269, Feb 3, 2004

Filed:

Dec 31, 2002

Appl. No.:

10/335630

Inventors:

Mark S. Rice - San Jose CA
Andrew J. Daiber - Emerald Hills CA

Assignee:

Intel Corporation - Santa Clara CA

International Classification:

H01S 313

US Classification:

372 29022, 372 29023, 372 32, 372 2902, 372 28

Abstract:

An apparatus including a cavity optical length actuator to vary a cavity optical path length of a laser in response to an excitation signal having varying frequencies. The cavity optical length actuator induces intensity perturbations in an optical beam of the laser corresponding to the excitation signal. A sensor senses the intensity perturbations in the optical beam and generates a response signal corresponding to the intensity perturbations. A combiner combines the excitation signal and the response signal to generate an error signal.