| Patent Number |
Title Of Patent |
Date Issued |
| RE38809 |
Photonic variable delay devices based on optical birefringence |
October 4, 2005 |
| Optical variable delay devices for providing variable true time delay to multiple optical beams simultaneously. A ladder-structured variable delay device comprises multiple basic building blocks stacked on top of each other resembling a ladder. Each basic building block has two polarizat |
| RE38735 |
Compact programmable photonic variable delay devices |
May 17, 2005 |
| Optical variable delay devices for providing variable true time delay to multiple optical beams simultaneously. A ladder-structured variable delay device comprises multiple basic building blocks stacked on top of each other resembling a ladder. Each basic building block has two polarizat |
| 7436569 |
Polarization measurement and self-calibration based on multiple tunable optical polarization rot |
October 14, 2008 |
| Devices and techniques for generating and analyzing states of polarization in light using multiple adjustable polarization rotators in various applications. |
| 7391977 |
Monitoring mechanisms for optical systems |
June 24, 2008 |
| This application describes optical monitoring devices and applications in optical systems for monitoring various optical parameters of light, including the signal to noise ratio, the degree of polarization, and the differential group delay (DGD). |
| 7382962 |
Fiber stretcher apparatus |
June 3, 2008 |
| Designs of fiber stretcher apparatus using one or more linear actuators to stretch fiber loops for various applications including variable optical delay lines and devices using such delay lines. |
| 7372568 |
Low cost polametric detector |
May 13, 2008 |
| Polarimeters based on transversal division of the input beam and use of different polarization elements in different polarization states to change polarizations of different portions of the input beam so that the power levels of the different portions of the input beam can be measured |
| 7343100 |
Optical communications based on optical polarization multiplexing and demultiplexing |
March 11, 2008 |
| This application describes techniques for optical multiplexing and demultiplexing in optical communication systems based on polarization multiplexing of different signal channels. |
| 7265837 |
Sensitive polarization monitoring and controlling |
September 4, 2007 |
| Techniques and devices for monitoring polarization of light using at least two polarization elements where the difference between the outputs of the two polarization elements are used to monitor a change in polarization. |
| 7265836 |
In-line optical polarimeter using free-space polarization sampling elements |
September 4, 2007 |
| This application teaches various implementations of methods and in-line polarimeters with free-space sampling elements to sample four sample beams for determining the polarization state of input light. In one exemplary implementation, a device in this application includes four optica |
| 7233720 |
Devices based on optical waveguides with adjustable Bragg gratings |
June 19, 2007 |
| A system for filtering light propagating in a waveguide is described. The system utilizes an adjustable periodic grating which induces mode coupling of predetermined frequencies of light propagating in the waveguide. |
| 7227686 |
Tunable PMD emulators and compensators |
June 5, 2007 |
| Tunable PMD emulators and compensators for producing different PMD profiles with an adjustable average DGD value. |
| 7218436 |
Optical instrument and measurements using multiple tunable optical polarization rotators |
May 15, 2007 |
| Devices and techniques for generating and analyzing states of polarization in light using multiple adjustable polarization rotators in various applications. |
| 7157687 |
Optical devices with folded optical path designs |
January 2, 2007 |
| Optical devices with folded optical paths to reduce size of optical devices and optical elements in the optical devices. The folded optical paths operate by manipulating optical polarization of light. Exemplary optical switches and variable optical attenuators are described. |
| 7154659 |
Optical depolarizers and DGD generators based on optical delay |
December 26, 2006 |
| Techniques and devices for depolarizing light and producing a variable differential group delays in optical signals. In one implementation, an input optical beam is split into first and second beams with orthogonal polarizations. One or two optical reflectors are then used to cause the |
| 7067795 |
Methods and systems for dynamic control of polarization of an optical signal |
June 27, 2006 |
| Techniques and systems for dynamically controlling polarization of an optical signal by using various feedback controls, and by combining both feed-forward and feedback controls. Various dynamic control algorithms for such systems and other optical systems have been disclosed. |
| 7027198 |
Generation and analysis of state of polarization using tunable optical polarization rotators |
April 11, 2006 |
| This application describes optical monitoring devices and applications in optical systems for monitoring various optical parameters of light, including the signal to noise ratio, the degree of polarization, and the differential group delay (DGD). |
| 6975454 |
Variable polarization-dependent-loss source |
December 13, 2005 |
| An optical device including a beam splitter, polarization controller, and beam combiner is described. In some embodiments, the beam splitter and beam combiner are provided in a single element. An incoming light beam is split into two beams with different polarization components. The |
| 6937798 |
Optical spectrum monitor |
August 30, 2005 |
| Devices and techniques for monitoring spectrum of light. For example, a fiber spectral monitoring device and associated technique are described for monitoring spectral information in light based on an interferometer design. |
| 6873783 |
Fiber devices with transverse-pressure-controlled squeezers |
March 29, 2005 |
| Implementations of a polarization control method and apparatus are provided. In one implementation, a device uses super-polished squeezing surfaces to apply pressure against a polyimide coated fiber thereby minimizing micro-bending effects that cause losses in the fiber. Special cont |
| 6836327 |
In-line optical polarimeter based on integration of free-space optical elements |
December 28, 2004 |
| In-line optical polarimeters and techniques for calibrating such polarimeters are described. In one implementation a polarimeter integrates components in free space to enhance device performance. |
| 6795616 |
Control of guided light in a waveguide |
September 21, 2004 |
| A system for filtering light propagating in a waveguide is described. The system utilizes an adjustable periodic grating which induces mode coupling of predetermined frequencies of light propagating in the waveguide. |
| 6754404 |
Transverse-pressure-controlled fiber devices |
June 22, 2004 |
| Implementations of a polarization control method and apparatus are provided. In one implementation, a device uses super-polished squeezing surfaces to apply pressure against a polyimide coated fiber thereby minimizing micro-bending effects that cause losses in the fiber. Special cont |
| 6628862 |
Thermal-induced waveguide gratings |
September 30, 2003 |
| Techniques and devices for forming a controllable thermal grating in an optical waveguide. |
| 6628861 |
Control of guided light in waveguide using external adjustable grating |
September 30, 2003 |
| A system for filtering light propagating in a waveguide is described. The system utilizes an adjustable periodic grating which induces mode coupling of predetermined frequencies of light propagating in the waveguide. |
| 6628850 |
Dynamic wavelength-selective grating modulator |
September 30, 2003 |
| Techniques and devices for modulating an optical signal transmitting through an optical waveguide such as a fiber and a planar waveguide by dynamically controlling an adjustable grating formed in a cladding layer of the waveguide. |
| 6576886 |
Dynamic control of polarization of an optical signal |
June 10, 2003 |
| Techniques for dynamically controlling polarization of an optical signal by combining both feed-forward and feedback controls. |
| 6493474 |
Fiber devices based on fiber squeezer polarization controllers |
December 10, 2002 |
| An improved polarization control method and apparatus is provided. The described invention uses super-polished squeezing surfaces to apply pressure against a polyimide coated fiber thereby minimizing micro-bending effects that cause losses in the fiber. Special control circuitry has also |
| 6487336 |
WDM channel equalization and control |
November 26, 2002 |
| Devices that couple variable attenuators to a single WDM multiplexer to individually adjust and control the power levels of different WDM channels, e.g., substantially equalizing the power levels of the channels. Optical reflection and in-fiber variable attenuators are implemented to |
| 6480637 |
Fiber squeezer polarization controller with low activation loss |
November 12, 2002 |
| An improved polarization control method and apparatus is provided. The described invention uses super-polished squeezing surfaces to apply pressure thereby minimizing micro-bending effects that cause losses in the fiber. Special control circuitry has also been designed to maintain a |
