Muhammad J Mughal

US Patent:

6982818, Jan 3, 2006

Filed:

Oct 10, 2003

Appl. No.:

10/684260

Inventors:

Nabeel Agha Riza - Oviedo FL, US
Muhammad Junaid Mughal - Orlando FL, US

Assignee:

Nuonics, Inc. - Winter Park FL

International Classification:

G02F 1/00
G01J 5/02

US Classification:

359237, 359285, 359312, 25033907, 250343

Abstract:

Electronically agile optical filtering modules for equalizing light propagation differences in at least two spaced optical beam pathways in the modules. The modules use optical polarization rotation devices that may include acousto-optic tunable filter (AOTF) devices, liquid crystal devices, and magneto-optic devices. Such devices may be subject to polarization dispersion losses (PDL) and polarization mode dispersion (PMD) that may be different for when light travel along different light paths through the device. By redirecting light beams back along a different bi-directional path through the devices which may exhibit non-uniform performance across orthogonal polarizations, PDL and PMD may be reduced.

US Patent:

7092079, Aug 15, 2006

Filed:

Sep 8, 2003

Appl. No.:

10/657808

Inventors:

Nabeel Agha Riza - Oviedo FL, US
Muhammad Junaid Mughal - Orlando FL, US

Assignee:

Nuonics, Inc. - Winter Park FL

International Classification:

G01J 1/00

US Classification:

356121

Abstract:

An agile optical beam profiler using a two-dimensional small tilt digital micromirror device/chip, a translation stage, and single photodetector or pair of photodetectors. A method of profiling an optical beam includes positioning a programmable spatial light modulator in an incident optical beam and sequentially moving the spatial light modulator to at least one position in a first planar direction in a displacement increment less than a pixel width of the spatial light modulator. The method also includes directing respective portions of the optical beam to a photodetector at each position of the spatial light modulator. The method may also include calibrating the photodetectors by directing a portion of the beam to the photodetector, then directing the entire beam, or a remaining portion of the beam, to the photodetector, and normalizing the detected power of the portion with the detected power of the entire beam, or remaining portion, respectively.