Abstract: Techniques and devices for optical sensing of rotation based on measurements and sensing of optical polarization or changes in optical polarization due to rotation without using optical interferometry.

Abstract: The technology disclosed in this application provide for non-destructive and non-contact optical characterization of fiber reinforced plastic composites and other structures under test based on optical transmission scanning.

Abstract: Techniques and devices for optical sensing of rotation based on measurements and sensing of optical polarization or changes in optical polarization due to rotation without using optical interferometry.

Abstract: Designs and implementations of light detection and ranging (LiDAR) systems that project light at a set of different wavelength division multiplexed (WDM) wavelengths based on WDM optical designs to reduce the number of components, complexity of LiDAR optical systems, the weight and cost of LiDAR systems for a wide range of applications.

Abstract: Techniques and devices for optical sensing of rotation based on measurements and sensing of optical polarization or changes in optical polarization in light waves in an optical loop due to rotation without using optical interferometry and a closed loop feedback in modulating the light in the optical loop.

Abstract: The disclosed technology includes, among others, methods and devices for measuring distributed fiber bend or stress related characteristics along an optical path of fiber under test (FUT) uses both a light input unit and a light output unit connected to the FUT at one single end.

Abstract: Techniques and devices for sensing or measuring electric currents and/or temperature based on photonic sensing is disclosed. An optical current sensor head is located near or at a current-carrying conductor so that a magnetic field associated with the current is present at a Faraday material and the optical detection unit detects the light from the Faraday material to determine a magnitude of the current. An optical temperature sensor head is located near or at a location so that the temperature at a temperature-sensing Faraday material is reflected by the optical polarization rotation which is detected to determine the temperature.

Abstract: Techniques, devices or systems based on optoelectronic oscillators (OEOs) to provide operations of optical sensing and ranging and other optical sensing operations including detecting objects based on light detection and ranging (LiDAR) based on either continuous wave or pulsed optical probe light from OEOs.

Abstract: Optical polarization-based devices and techniques are provided to enable low cost construction and easy signal processing to measure the light frequency via measurements of signals associated with a delay between the two orthogonal polarizations after passing through a DGD element and the retardation value of the DGD element without directly measuring the optical frequency. The optical detection may be designed in various configurations. In particular, for example, the optical detection may split the optical output of the DGD into two optical beams with two different optical detectors so that the final frequency information can be deducted into a pair of sine and cosine functions, such as a pair of sine and cosine functions of measured optical signal levels and the retardation value of the DGD element.

Abstract: Optical designs and techniques for providing compact optical delay lines by using a dual fiber collimator structured to include (1) an input fiber line that receives and guides an input light beam, (2) an output fiber line that guides and exports an output light beam that has an optical delay relative to the input light beam, and (3) a collimating lens placed on one side of end facets of the input and output fiber lines to receive the input light beam from the input fiber line and to output the output beam light to the output fiber line.

Abstract: Optical designs and techniques for providing compact optical delay lines by using a dual fiber collimator structured to include (1) an input fiber line that receives and guides an input light beam, (2) an output fiber line that guides and exports an output light beam that has an optical delay relative to the input light beam, and (3) a collimating lens placed on one side of end facets of the input and output fiber lines to receive the input light beam from the input fiber line and to output the output beam light to the output fiber line.

Abstract: The technology disclosed in this application provide for non-destructive and non-contact optical characterization of fiber reinforced plastic composites and other structures under test based on optical transmission scanning.

Abstract: This patent document discloses fiber sensing techniques and devices for shape monitoring by using single- and multi-core optical fiber implementations and optical interferometry. Implementations can be made based on coherent optical time domain reflectometry (OTDR) or optical frequency domain reflectometry (OFDR).

Abstract: Techniques and devices for optical sensing of rotation based on measurements and sensing of optical polarization or changes in optical polarization due to rotation without using optical interferometry.

Abstract: This patent application discloses techniques and devices for sensing or measuring electric currents and/or temperature based on photonic sensing techniques. An optical current sensor head is located near or at a current-carrying conductor so that a magnetic field associated with the current is present at a Faraday material and the optical detection unit detects the light from the Faraday material to determine a magnitude of the current. An optical temperature sensor head is located near or at a location so that the temperature at a temperature-sensing Faraday material is reflected by the optical polarization rotation which is detected to determine the temperature.

Abstract: The disclosed technology in this patent document includes, among others, methods and apparatus for distributed measuring at least one of fiber bend or stress related characteristics along an optical path of a fiber under test (FUT) using both a light input unit and a light output unit connected to the FUT at one single end.

Abstract: Techniques and devices for optical sensing of rotation based on measurements and sensing of optical polarization or changes in optical polarization due to rotation without using optical interferometry. In implementations, a device for optical sensing of rotation can include a detection device that includes: (1) a beam splitter that splits the optical output into four optical beams; (2) four detection modules that receive the four optical beams, respectively, to obtain measurements of four different optical Stokes parameters from the four optical beams, respectively, and (3) a processing unit that processes the measurements of four different optical Stokes parameters to determine a rotation angle of a state of polarization of the optical output and a differential phase shift between the first and the second optical beams caused by a rotation experienced by the optical loop.

Abstract: The disclosed technology includes, among others, methods and devices for measuring distributed fiber bend or stress related characteristics along an optical path of fiber under test (FUT) uses both a light input unit and a light output unit connected to the FUT at one single end.

Abstract: The disclosed technology in this patent document includes, among others, methods apparatus for distributed measuring at least one fiber bend or stress related characteristics along an optical path of fiber under test (FUT) uses both a light input unit and a light output unit connected to the FUT at one single end.

Abstract: Optical techniques and sensor devices for sensing or measuring electric currents and/or temperature based on photonic sensing techniques in optical reflection modes by using optical dielectric materials exhibiting Faraday effects are provided in various configurations. The disclosed optical sensing technology uses light to carry and transmit the current or temperature information obtained at the sensing location to a remote base station and this optical transmission allows remote sensing in various applications and provide a built-in temperature calibration mechanism to enhance the measurement accuracy in a range of different temperature conditions.