Donald L Mcdaniel

US Patent:

6600846, Jul 29, 2003

Filed:

Jan 15, 2001

Appl. No.:

09/761008

Inventors:

Donald L. McDaniel - North Andover MA
Daryoosh Vakhshoori - Cambridge MA
Masud E. Azimi - Nashua NH
Parviz Tayebati - Boston MA

Assignee:

CoreTek, Inc. - Wilmington MA

International Classification:

G02B 612

US Classification:

385 14, 359110, 359130

Abstract:

A fully integrated optical system for monitoring the channels of an optical fiber in a WDM fiberoptic system.

US Patent:

6677570, Jan 13, 2004

Filed:

May 2, 2001

Appl. No.:

09/847506

Inventors:

Yakov Kogan - Wayland MA
Donald McDaniel - North Andover MA
Reich Watterson - Lexington MA

Assignee:

Nortel Networks Limited - St. Laurent

International Classification:

H01J 4014

US Classification:

250214A, 250214 L, 250238

Abstract:

According to an aspect of the present invention, a power detector including a photodiode and a logarithmic transimpedance amplifier is mounted inside a hermetically sealed package in such a way that the photodiode and the logarithmic transimpedance amplifier are located on the same thermally conductive substrate.

US Patent:

6744524, Jun 1, 2004

Filed:

Jun 3, 2002

Appl. No.:

10/103416

Inventors:

Yakov Kogan - Bedford MA
Reich L. Watterson - Lexington MA
Donald L. McDaniel - North Andover MA

Assignee:

Nortel Networks Limited - St. Laurent

International Classification:

G01B 902

US Classification:

356519

Abstract:

A method and apparatus is provided for calibrating a Fabry-Perot etalon based optical measurement system. The calibration is performed by analyzing the shape of transmission peaks output from the etalon in response to a known optical signal and using that information, along with a formula that approximates the response of the etalon, to perform the calibration.

US Patent:

6765682, Jul 20, 2004

Filed:

Jan 11, 2002

Appl. No.:

10/044250

Inventors:

Yakov Kogan - Bedford MA
Donald McDaniel - North Andover MA

Assignee:

Nortel Networks Limited - St. Laurent

International Classification:

G01B 902

US Classification:

356519

Abstract:

According to an aspect of the present invention, a circuit is provided for determining the wavelength and power of a given optical signal across a wide dynamic range. The wavelength and power determinations are performed by logarithmic ratio amplifier in concert with a digital signal processor that utilizes representative equations of the measured optical signal.

US Patent:

6934033, Aug 23, 2005

Filed:

Dec 28, 2000

Appl. No.:

09/750204

Inventors:

Donald L. McDaniel - North Andover MA, US
Rong Huang - Woburn MA, US
Parviz Tayebati - Boston MA, US
Reich L. Watterson - Lexington MA, US

Assignee:

Coretek, Inc. - Billerica MA

International Classification:

G01B009/02

US Classification:

356454

Abstract:

Wavelength reference apparatus for use in calibrating a tunable Fabry-Perot filter or a tunable VCSEL, whereby the device may be tuned to a precise, known wavelength, the wavelength reference apparatus comprising an LED, where the LED is chosen so as to have an emission profile which varies with wavelength; an etalon, where the etalon is chosen so as to have a transmission profile which comprises a comb of transmission peaks, with each transmission peak occurring at a precise, known wavelength; and a detector for detecting the light emitted by the LED and passing through the etalon; whereby when a tunable Fabry-Perot filter or tunable VCSEL is positioned between the etalon and the detector, and the device is swept through its tuning range by varying the tuning voltage applied to the device, the known transmission wavelengths established by the LED and the etalon can be correlated to counterpart tuning voltages of the device, whereby to calibrate the device.

US Patent:

20120119658, May 17, 2012

Filed:

Nov 17, 2010

Appl. No.:

12/948747

Inventors:

Donald Louis McDaniel - North Andover MA, US

Assignee:

Luminus Devices, Inc. - Billerica MA

International Classification:

H05B 37/02
H05K 13/00

US Classification:

315151, 315294, 295921

Abstract:

A system and method for tuning white light while reducing manufacturing costs.

US Patent:

20220229307, Jul 21, 2022

Filed:

Jan 17, 2022

Appl. No.:

17/577168

Inventors:

- Shizuoka, JP
Kosuke Saito - Hamamatsu-shi, JP
Alexander Cutler - Hopkinton MA, US
Jonathan P. Murray - Chelmsford MA, US
Donald L. McDaniel - North Andover MA, US
Huiling Zhu - Lexington MA, US

Assignee:

Hamamatsu Photonics K.K. - Shizuoka

International Classification:

G02B 27/10
G02B 26/00

Abstract:

A spectrally-shaped source includes a source that generates a round beam. An optical element transforms the round beam to a rectangular beam. An image forming dispersive device angularly disperses wavelengths and images the rectangular beam at a modulation plane. A pixelated SLM is illuminated by the dispersed wavelengths of the rectangular beam such that each column of illuminated pixels is illuminated by a different wavelength. Toroidal optics projects light directed from the SLM to an output plane and focuses the angularly dispersed wavelengths of the beam so that a selected portion of the optical beam is reflected toward the toroidal optic by the SLM. A controller instructs the pixelated SLM to selectively reflect the portion of the optical beam toward the toroidal optic and to selectively reflect another portion of the beam away from the toroidal optic so as to provide a desired spectral shape.