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| Number | Title | Issue Date |
| 8174756 | Rhomb beam splitter in optical communication Rhomb beam splitters are used to implement various optical demodulators, in particular PSK and DPSK demodulators. The parallel beam-splitting and reflective surfaces of the rhomb structure produce reflection and transmission beams that exit the beam splitter paralle... | 05/08/2012 |
| 8164824 | Demodulator A demodulator includes a splitter, a first dielectric substance, and a combiner. The splitter splits a differential phase shift keying optical signal into a first light beam and a second light beam and outputs the first light beam to a first optical path and the sec... | 04/24/2012 |
| 8111450 | Rhomb beam splitter in optical communication Rhomb beam splitters are used to implement various optical demodulators, in particular PSK and DPSK demodulators. The parallel beam-splitting and reflective surfaces of the rhomb structure produce reflection and transmission beams that exit the beam splitter paralle... | 02/07/2012 |
| 8068273 | Demodulator A demodulator and method are provided. The demodulator for demodulating an optical signal, includes a splitter that splits a differential phase modulation signal into a first split light component and a second split light component, couples the first split light com... | 11/29/2011 |
| 8064127 | Quasicrystalline structures and uses thereof This invention relates generally to the field of quasicrystalline structures. In preferred embodiments, the stopgap structure is more spherically symmetric than periodic structures facilitating the formation of stopgaps in nearly all directions because of higher rot... | 11/22/2011 |
| 8004749 | Pseudo common-path DPSK demodulator A rhomb beam splitter, rather than a conventional cube, is used in combination with a mirror reflecting both the reflected and transmitted beams to obtain a delay-line interferometer demodulator with a substantially common path. This significantly reduces the sensit... | 08/23/2011 |
| 8004750 | Multiple-FSR DPSK demodulator A switchable free-spectral-range mode selector is used to change the free spectral range of a free-space delay-line interferometer. The mode selector consists of a rotatable device with at least one transparent plate selected to produce the desired change in the fre... | 08/23/2011 |
| 7978401 | Delay demodulation devices The delay demodulation device 1 comprises: an input waveguide 2 which receives DQPSK signals; a Y-branch waveguide 3 which splits the input waveguide 2; a first Mach-Zehnder interferometer 4; and a second Mach-Zehnder interferomete... | 07/12/2011 |
| 7884996 | Delay-line demodulator A delay-line demodulator for demodulating a differential quadrature phase shift keying (DQPSK) signal is provided. The demodulator includes two Mach-Zehnder interferometers individually comprising two waveguides having different lengths therebetween and through whic... | 02/08/2011 |
| 7843627 | Coherent demodulation with reduced latency adapted for use in scanning probe microscopes A signal demodulator and the method of using the same in a scanning probe microscope or the like to provide a feedback path with reduced latency are disclosed. The demodulator includes an input port, a first mixer and a first integrator. The input port receives an i... | 11/30/2010 |
| 7813032 | Methods to control phase shifts of delay demodulation devices The present invention provides methods to control phase shift of delay demodulation devices to reduce Polarization Dependent wavelength (PDλ) to be less than, for example, 0.5 GHz (i.e. 0.004 nm). The method to control phase shift in a Planar Lightwave Circuit (PLC... | 10/12/2010 |
| 7649678 | Delay-line demodulator A delay-line demodulator for demodulating a differential quadrature phase shift keying (DQPSK) signal is provided. The demodulator includes two Mach-Zehnder interferometers individually comprising two waveguides having different lengths therebetween and through whic... | 01/19/2010 |
| 7649677 | Multi-ridged subwavelength aperture for optical transmission and thermally assisted magnetic recording A subwavelength aperture includes a plurality of ridges that project from an aperture sidewall into the aperture opening. The ridges may be closely spaced such that the hot spots associated with the ridges are likewise closely spaced and create an elongated hot spot... | 01/19/2010 |
| 7626754 | Light steering using an array of tunable phase delay elements An apparatus and method for steering a beam of light using an array of tunable optical phase delay elements is presented. The sidelobes of an angular spectrum of light reflected from the array are causing an optical crosstalk. The selected sidelobes are suppressed b... | 12/01/2009 |
| 7480091 | Delay-line demodulator and method of adjusting a phase shift in the demodulator In a method of phase adjustment for the demodulator 1 of the present invention, the phase adjustment is performed by driving any one of the heaters on the two waveguides 10 and 11 in the Mach-Zehnder interferometer (MZI) 6 and on the two ... | 01/20/2009 |
| 7411725 | Optical signal demodulator A demodulator includes: a Michelson interferometer having: a half-mirror which splits an optical signal, emits a first split light to a first optical path, and emits a second split light to a second optical path; a first reflector which reflects the first split ligh... | 08/12/2008 |
| 7411726 | Multi-channel differentially encoded phase shift keyed receivers An optical, multi-channel, Differential Phase Shift Keying (DPSK) receiver demodulates multiple Wavelength Division Multiplexed (WDM) channels using at least one interferometer. This distributes expense of the interferometer(s) over all channels of an optical signal... | 08/12/2008 |
| 7379652 | Method and apparatus for detecting optical spectral properties using optical probe beams with multiple sidebands Techniques for detecting optical spectral properties of a target are described. The technique includes providing an optical carrier which has an optical frequency bandwidth which is narrow compared to the width of the narrowest spectral feature of the target to be d... | 05/27/2008 |
| 7366055 | Ocean bottom seismic sensing system Seismic sensor systems and sensor station topologies, as well as corresponding cable and sensor station components, manufacturing and deployment techniques are provided. For some embodiments, networks of optical ocean bottom seismic (OBS) stations are provided, in w... | 04/29/2008 |
| 7340180 | Countermeasures for idle pattern SRS interference in ethernet optical network systems Optical networks as defined by the IEEE 802.3ah standard suffer from Stimulated Raman Scattering (SRS) that causes data transmission at a first optical wavelength to interfere with broadcast video transmission at a second optical wavelength in single mode optical fi... | 03/04/2008 |
| 7330304 | Method and apparatus for PPM demodulation using a semiconductor optical amplifier An optical pulse position modulation receiver relying on the gain dynamics in a semiconductor optical amplifier (SOA). Optical PPM signal pulses and periodic optical clock pulses at a different frequency and/or polarization than the signal pulses are coupled into an... | 02/12/2008 |
| 7327913 | Coherent optical detector and coherent communication system and method 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 thir... | 02/05/2008 |
| 7327462 | Method and apparatus for direct detection of signals from a differential delay heterodyne interferometric system A direct detection method and apparatus for a fiber optic acoustic sensor array systems using an in-line Michelson sensor TDM array and an interferometric section having two acousto-optic modulators that produce optical pulses that are frequency shifted with respect... | 02/05/2008 |
| 7327923 | Spiral multilayer fibers A spiral wound fiber that includes birefringent interfaces is useful in different optical devices. One type of wound fiber includes at least first and second material layers. At least one of the layers is polymeric and at least one of the layers is birefringent. The... | 02/05/2008 |
| 7321731 | Optical pulse position modulation discriminator Systems and methods are disclosed herein to provide various optical techniques. For example, in accordance with an embodiment of the present invention, a pulse position modulation discriminator architecture is disclosed for discriminating temporal positions of PPM-e... | 01/22/2008 |
| 7266311 | Control of delay line interferometer The delay setting of an optical delay line interferometer (DLI) used to decode differentially encoded phase shift keyed signals (DPSK or DQPSK) is controlled using a control signal representative of the ratio Perr2/Perr1 of the rate of occurren... | 09/04/2007 |
| 7262402 | Integrated imager circuit comprising a monolithic array of single photon avalanche diodes An integrated imager circuit having a monolithic array of single photon avalanche diodes (SPADs) for capturing an image of a scene when said scene is hit by an optical pulse. The array has a plurality of SPADs connected to 2D readout circuits which determines the in... | 08/28/2007 |
| 7259901 | Optical signal demodulators An optical signal demodulator for demodulating an M-ary phase shift key (PSK) optical signal comprises a plurality of interferometers arranged such that the optical signal is divided between the interferometers. Each interferometer comprises a plurality of interfero... | 08/21/2007 |
| 7233430 | Multi-channel DPSK receiver An optical, multi-channel, Differential Phase Shift Keying (DPSK) receiver demodulates multiple Wavelength Division Multiplexed (WDM) channels using a single interferometer. This distributes expense of the interferometer over all channels of an optical signal, allow... | 06/19/2007 |
| 7233399 | Feedback control of an interferometer The invention proposes a method for feedback control, in which a portion of a data signal is split and rectified and the signal intensity is detected with slow speed electronics for improving the control of a delay line interferometer (DLI) used in optical data tran... | 06/19/2007 |
| 7215894 | Optical transmitter device An optical transmitter device capable of high-speed shutdown of optical output. A bias controller generates a low-frequency signal, extracts the frequency component of a low-frequency signal from an electrical signal fed back thereto, and compares the phase of the f... | 05/08/2007 |
| 7173753 | Optical data receiver systems An optical data receiver for the distribution and demodulation of compressed TDM data packages comprises, optical distributor means to which the data packages are applied for selective distribution to a plurality of AWG optical demultiplexer/detector arrays, so that... | 02/06/2007 |
| 7171082 | Method and apparatus for optical top-hat pulse generation An optical top-hat pulse generator comprising a polarization-maintaining fiber loop and controlled by solitons. A polarization-maintaining coupler launches a continuous wave optical signal into the fiber loop along a principal axis of the fiber loop. Another coupler... | 01/30/2007 |
| 7155071 | Device for Mach-Zehnder modulator bias control for duobinary optical transmission and associated system and method An electro-optical device includes an amplifier having an input receiving a data signal, a crossing adjustment input, and an output. The device includes a light source and a Mach-Zehnder modulator having a first input coupled to the output of the amplifier, an optic... | 12/26/2006 |
| 7149029 | Interferometric PPM demodulators based on semiconductor optical amplifiers An optical demodulator for use as a pulse position demodulator. The demodulator has one or more semiconductor optical amplifiers coupled to receive an optical signal to be demodulated at first end thereof and for receiving optical control pulses at a second end ther... | 12/12/2006 |
| 7145713 | Techniques for recovering optical spectral features using a chirped optical field Techniques for recovering optical spectral features include receiving a detected time series that represents a temporally varying intensity of an optical signal. The optical signal is formed in response to an interaction between a target optical spectrum and a chirp... | 12/05/2006 |
| 7136426 | Communication system including a wire network linked with another network via radio waves A vehicle-vehicle communication system includes an in-vehicle wire LAN established in a vehicle. The in-vehicle wire LAN includes a plurality of devices connected by optical fiber links. A terminal for radio vehicle-vehicle communication is connected to the in-vehic... | 11/14/2006 |
| 7134343 | Opto-acoustoelectric device and methods for analyzing mechanical vibration and sound An opto-acoustoelectric device encompasses a diaphragm having a diffraction grating, the diaphragm is susceptible to a vibration driven by an external force; a light source oriented to irradiate the diffraction grating; and a photo detector configured to detect the ... | 11/14/2006 |
| 7133135 | Method and apparatus for the direct characterization of the phase of an optical signal A method and apparatus for the direct characterization of the phase of an optical signal includes measuring the interference between the optical signal and a sequence of optical pulses and processing the measured interference. The method and apparatus split and comb... | 11/07/2006 |
| 7068412 | Multi-wavelength generating method and apparatus based on flattening of optical spectrum With respect to the relative intensity noise (RIN) for inputs to an optical modulator or the signal-to-noise ratio (SNR) for outputs therefrom, the optical modulator modulating coherent lights of different wavelengths obtained by slicing a spectrum of the multi-wave... | 06/27/2006 |
