Witzens
Jeremy Witzens, Seattle, WA US
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20100128336 | INTEGRATED CONTROL SYSTEM FOR LASER AND MACH-ZEHNDER INTERFEROMETER - An integrated control system for a laser and Mach-Zehnder interferometer are disclosed and may include configuring a bias point for low-speed control of an optical modulator utilizing control circuitry integrated on the same CMOS die. The optical modulator may be differentially monitored. A laser source for the modulator may be controlled utilizing monitor photodiodes via optical taps on outputs of the modulator, or utilizing a monitor photodiode on one output port of the modulator, which may comprise a Mach-Zehnder interferometer. An error signal may be generated by subtracting monitor photodiode signals from optical taps on output ports of the modulator. The bias point of the modulator may be adjusted by minimizing the error signal. Calibration time of the bias point may be reduced utilizing electronic data inversion. An output of the modulator may comprise a Y-junction and a single monitor photodiode may measure both branches of the modulator. | 05-27-2010 |
Jeremy Witzens, Aachen DE
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20110305414 | METHOD AND SYSTEM FOR INTEGRATED POWER COMBINERS - A system for integrated power combiners is disclosed and may include receiving optical signals in input optical waveguides and phase-modulating the signals to configure a phase offset between signals received at a first optical coupler, where the first optical coupler may generate output signals having substantially equal optical powers. Output signals of the first optical coupler may be phase-modulated to configure a phase offset between signals received at a second optical coupler, which may generate an output signal having an optical power of essentially zero and a second output signal having a maximized optical power. Optical signals received by the input optical waveguides may be generated utilizing a polarization-splitting grating coupler to enable polarization-insensitive combining of optical signals. Optical power may be monitored using optical detectors. The monitoring of optical power may be used to determine a desired phase offset between the signals received at the first optical coupler. | 12-15-2011 |
20130195401 | Integrated Microtoroids Monolithically Coupled with Integrated Waveguides - A photonic apparatus comprises an integrated waveguide, an integrated resonator in the form of a microtoroid and a thermally reflowable film. The reflowable film comprises a first film area and a second film area. The reflowable film is one of a thin film and a stack of thin films. The first film area is thermally reflown, the microtoroid is formed in the thermally reflown first film area. The second film area is not reflown in the immediate vicinity of the microtoroid. The microtoroid is optically coupled to the integrated waveguide located on or located within one of or both of the first or second film areas. The first and second film areas are directly connected to each other. The microtoroid has an edge extending along a circumference. The microtoroid can be a non-inverted or an inverted microtoroid, wherein the second film area is inside or outside of the circumference. | 08-01-2013 |
20130209112 | Laser to Chip Coupler - A method and an apparatus for butt-coupling an input beam incoming from a photonic device of a second optical element to a primary photonic chip at an input interface of the primary photonic chip is disclosed. The primary photonic chip comprises a coupling apparatus. The light from the input beam is butt-coupled to the coupling apparatus. The coupling apparatus comprises a plurality of more than one single mode optical paths on the primary photonic chip. The single mode optical paths are strongly coupled to each other at the input interface of the primary photonic chip. Regions of strongly coupled single mode optical paths can correspond to one or both of distinct but highly coupled waveguides or waveguides fully merged into a multi-mode section. | 08-15-2013 |
20130221211 | Broadband Optical Phase Detection and Phase Noise Removal with an Optical Resonator - A phase noise detection apparatus comprises a laser beam, an optical resonator coupled thereto at a coupling point and a photodetector receiving light from the laser beam. The laser beam and the resonator coupled thereto convert phase noise of light transported by the laser beam prior to the coupling point into intensity noise of light transported by the laser beam thereafter. Intensity noise is converted into an electrical signal by the photodetector. The electrical signal is sent through a first signal path and a second signal path such that the first signal path transports a signal substantially proportional to the intensity noise, which is integrated in an integrator in the second path. Relative gain of the two signal paths can be adjusted and the overall gain of the signal path is preferably such that the optical phase modulator at least partially cancels said phase noise in the optical domain. | 08-29-2013 |
Jeremy Witzens, Del Mar, CA US
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20120024010 | ENHANCING THE OPTICAL CHARACTERISTICS OF A GEMSTONE - Various embodiments described herein comprise a gemstone or other piece of jewelry, which incorporates one or more diffractive optical elements to enhance the fire displayed by the gemstone. In certain embodiments, the diffractive optical element comprises a diffraction grating etched on one or more facets of the gemstone. | 02-02-2012 |
20120234393 | APPARATUS FOR DETECTING TARGET MOLECULES AND RELATED METHODS - An apparatus for analysis of a sample and in particular of a biological sample. The apparatus contains a microfluidic chip with dies, adapted to be selectively activated or deactivated by presence of target molecules in the biological sample. The apparatus further contains a light source to emit light for illumination of the microfluidic chip and an optical filter to allow passage of the light from the dies once activated or deactivated by the presence of the target molecules. A method for pressurizing a microfluidic chip is also disclosed, where a chamber is provided, the chamber is connected with the microfluidic chip and pressure is applied to the chamber. | 09-20-2012 |
Jeremy Witzens, Cologne DE
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20140064734 | WDM TELECOMMUNICATIONS LINK WITH COHERENT DETECTION AND OPTICAL FREQUENCY COMB SOURCES - An optical data link has a transmitter and a receiver with coherent detection at the receiver and more than one optical carrier frequency. The optical carrier frequencies are generated by a frequency comb source in both the transmitter and the receiver. The frequency comb sources generate frequency combs that have frequency components and a free spectral range. The optical carrier frequencies transport more than one optical channel. Either at least one frequency component or the free spectral range of the optical comb generated at the receiver is locked to the comb generated at the transmitter by an optical phase locked loop, or an electrical phase locked loop or a feed-forward carrier recovery generates an intermediate frequency carrier reference that is routed to more than one channel to demodulate the data. | 03-06-2014 |
Jeremy Witzens, Koln DE
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20140126856 | Method and System for Integrated Power Combiners - A method and system for integrated power combiners are disclosed and may include a chip comprising a polarization controller, the polarization controller comprising an input optical waveguide, optical couplers, and a polarization-splitting grating coupler. The chip may be operable to: generate two output signals from a first optical coupler that receives an input signal from said input optical waveguide, phase modulate one or both of the two output signals to configure a phase offset between the two generated output signals before communicating signals with the phase offset to a second optical coupler. One or both optical signals generated by said second optical coupler may be phase modulated to configure a phase offset between signals communicated to the polarization-splitting grating coupler; and an optical signal of a desired polarization may be launched into an optical fiber via the polarization-splitting grating coupler by combining the signals communicated to the polarization-splitting grating coupler. | 05-08-2014 |
Jeremy Witzens, Koeln DE
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20140248019 | ELECTRO-OPTICAL MODULATOR BASED ON CARRIER DEPLETION OR CARRIER ACCUMULATION IN SEMICONDUCTORS WITH ADVANCED ELECTRODE CONFIGURATION - An electro-optical modulator with two electrodes as part of a transmission line of a first phase modulator and two electrodes as part of a transmission line of a second phase modulator included in two arms of a Mach-Zehnder-interferometer. An electrical controller applies a first electrical high-frequency-modulated voltage signals between the first and second electrodes and applies a second electrical high-frequency-modulated signals between the fourth and third electrodes. The electrical controller applies signals such that voltages applied to the first and fourth electrodes have substantially a same high-frequency content, and voltages applied to the second and third electrodes have substantially the same high-frequency content. In such configuration, a constant voltage offset is produced by either the voltages applied to the first and fourth electrodes or, the second and third electrodes. Thereby, cross-talk between electrodes, electrical losses, device size and fabrication costs may be reduced. | 09-04-2014 |