Christopher D Kerr

US Patent:

7327913, Feb 5, 2008

Filed:

Sep 22, 2003

Appl. No.:

10/669130

Inventors:

Isaac Shpantzer - Bethesda MD, US
Arkady Kaplan - East Brunswick NJ, US
Aviv Salamon - Washington DC, US
Yaakov Achiam - Rockville MD, US
Jacob B. Khurgin - Baltimore MD, US
Michael Tseytlin - Bethesda MD, US
Pak Shing Cho - Gaithersburg MD, US
Arthur Greenblatt - Silver Spring MD, US
Christopher Kerr - Annapolis MD, US
Geoffrey Harston - Laurel MD, US

Assignee:

Celight, Inc. - Silver Spring MD

International Classification:

G02B 6/12
G02B 6/26
G02F 1/03
G02F 1/07
H04B 10/06

US Classification:

385 15, 385 14, 359245, 398204, 398214

Abstract:

An optical device is provided with first and second inputs. A first coupler coupled is coupled to the first input and produces at least a first and second output. A second coupler is coupled to the second input and produces at least a first and second output. A third coupler is coupled to the first output of the first coupler and to the first output of the second coupler. A fourth coupler is coupled to the second output of the first coupler and to the second output of the second coupler. First and second crossing waveguides are provided with an angle selected to minimize crosstalk and losses between the first and second cross waveguides. The first crossing waveguide connects one of the first or second outputs from the first coupler with an input of the fourth coupler. The second crossing waveguide connects one of the first or second outputs from the second coupler with an input of the third coupler. A first phase shifter is coupled to the first and second waveguides.

US Patent:

7397979, Jul 8, 2008

Filed:

Dec 14, 2006

Appl. No.:

11/610964

Inventors:

Isaac Shpantzer - Bethesda MD, US
Arkady Kaplan - Rockville MD, US
Aviv Salamon - Washington DC, US
Yaakov Achiam - Rockville MD, US
Jacob B. Khurgin - Baltimore MD, US
Michael Tseytlin - Bethesda MD, US
Pak Shing Cho - Gaithersburg MD, US
Arthur Greenblatt - Silver Spring MD, US
Christopher Kerr - Annapolis MD, US
Geoffrey Harston - Laurel MD, US

Assignee:

CeLight, Inc. - Silver Spring MD

International Classification:

G02B 6/12
G02B 6/26
G02F 1/03
G02F 1/07
H04B 10/06

US Classification:

385 14, 385 15, 359245, 398204, 398214

Abstract:

An optical device is provided with first and second inputs. A first coupler coupled is coupled to the first input and produces at least a first and second output. A second coupler is coupled to the second input and produces at least a first and second output. A third coupler is coupled to the first output of the first coupler and to the first output of the second coupler. A fourth coupler is coupled to the second output of the first coupler and to the second output of the second coupler. First and second crossing waveguides are provided with an angle selected to minimize crosstalk and losses between the first and second cross waveguides. The first crossing waveguide connects one of the first or second outputs from the first coupler with an input of the fourth coupler. The second crossing waveguide connects one of the first or second outputs from the second coupler with an input of the third coupler. A first phase shifter is coupled to the first and second waveguides.

US Patent:

54394023, Aug 8, 1995

Filed:

Sep 30, 1994

Appl. No.:

8/314278

Inventors:

Charles M. Dai - Potomac MD
Christopher J. Kerr - Germantown MD
Phuc N. Nguyen - Lorton VA

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

B63H 11103

US Classification:

440 47

Abstract:

The invention is directed to a method for designing a fluid inlet duct for marine vehicle hull, generally comprises the steps of: (a) determining an inlet duct surface geometry, represented by a series of fifth-order Bezier cross-link curves, within specified hydrodynamic design constraints; (b)generating a panel representation of the surface geometry; (c) calculating the pressure and velocity distributions of the flow within the inlet duct; (d) evaluating the surface geometry; (e) repeating steps (a)-(d) for subsequent iterations of the surface geometry until the specified hydrodynamic design constraints are satisfactorily met at a predetermined design condition; (f) evaluating a resulting surface geometry at off-design conditions; (g) repeating step (a)-(d) for subsequent iterations of the surface geometry until the specified hydrodynamic design constraints are satisfactorily met at off-design conditions; (h) performing a geometric refinement to a fillet region of high curvature in the inlet duct; (i) generating a panel representation of a resulting surface geometry; (j) calculating the pressure and velocity distributions of the flow within the inlet duct; (k) evaluating the surface geometry at desired operating conditions; and (l) repeating steps (h)-(k) for subsequent iterations of the surface geometry until the specified hydrodynamic design constraints are optimally met.