Patents by Inventor Thomas Wetteland Baehr-Jones
Thomas Wetteland Baehr-Jones has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20240046011Abstract: Systems and methods for computer simulation for determining a field generated from a source, with the field interacting with one or more structures. The systems and methods comprise dividing a domain into subdomains, solving iteratively for the field in a subset of the subdomains by solving for a residual field within an extended subdomain around each subdomain within the subset. If the subdomain comprises a structure, the boundary of the structure extends beyond the boundary of the extended subdomain to a second extended subdomain.Type: ApplicationFiled: October 20, 2023Publication date: February 8, 2024Inventor: Thomas Wetteland BAEHR-JONES
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Patent number: 11506840Abstract: An integrated optical device fabricated in the back end of line process located within the vertical span of the metal stack and having one or more advantages over a corresponding integrated optical device fabricated in the silicon on insulator layer.Type: GrantFiled: April 30, 2019Date of Patent: November 22, 2022Assignee: Nokia Solutions and Networks OyInventors: Ruizhi Shi, Michael J. Hochberg, Ari Jason Novack, Thomas Wetteland Baehr-Jones
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Publication number: 20220207211Abstract: Systems and methods for computer simulation for determining a field generated from a source, with the field interacting with one or more structures. The systems and methods comprise dividing a domain into subdomains, solving iteratively for the field in a subset of the subdomains by solving for a residual field within an extended subdomain around each subdomain within the subset. If the subdomain comprises a structure, the boundary of the structure extends beyond the boundary of the extended subdomain to a second extended subdomain.Type: ApplicationFiled: August 12, 2020Publication date: June 30, 2022Inventor: Thomas Wetteland BAEHR-JONES
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Patent number: 11209674Abstract: An optical modulator apparatus may include a plurality of segment drivers, each segment driver having a unique offset voltage and driving but a portion or a segment of an electro-optical modulator. A modulating electrical signal may be applied to the segment drivers via a plurality of electrical delays. Parameters of the segment drivers may be selected so as to approximate a pre-defined transfer function, which may include a linear or a non-linear transfer function.Type: GrantFiled: April 13, 2020Date of Patent: December 28, 2021Assignee: Nokia Solutions & Networks OyInventors: Ran Ding, Thomas Wetteland Baehr-Jones, Peter D. Magill, Michael J. Hochberg, Alexander Rylyakov
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Patent number: 11175456Abstract: A low loss high extinction ratio on-chip polarizer is disclosed. The polarizer includes an input waveguide taper having an outer waveguiding region that widens in the direction of light propagation along at least a portion of the taper length, and a core waveguiding region that narrows in the direction of light propagation along at least a portion of the taper length, so as to selectively squeeze out light of undesired modes into the outer regions while preserving light of a desired mode in the waveguide core. An output filter section is provided to prevent light from reentering the output waveguide after being squeezed out. An integrated light absorber/deflector may be coupled to the outer waveguiding regions.Type: GrantFiled: October 25, 2019Date of Patent: November 16, 2021Assignee: Nokia Solutions & Networks OyInventors: Ruizhi Shi, Thomas Wetteland Baehr-Jones, Yangjin Ma, Yang Liu, Michael J. Hochberg, Matthew Akio Streshinsky, Alexandre Horth
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Patent number: 11086187Abstract: An optical waveguide modulator with automatic bias control is disclosed. A dither signal is applied to the modulator bias and its signature detected in light tapped from an output of the modulator using a phase sensitive dither detector such as a lock-in amplifier. The detected signal is processed using pre-recorded information defining the direction of the detected signal change relative to a change in the modulator bias, and the bias is adjusted in the direction determined using the information. An IQ bias of a quadrature modulator is controlled by dithering bias settings of two inner modulators at different dither frequencies, and detecting an oscillation at a sum frequency.Type: GrantFiled: November 14, 2019Date of Patent: August 10, 2021Assignee: Nokia Solutions & Networks OyInventors: Kishore Padmaraju, Thomas Wetteland Baehr-Jones, Bernd-Harald Horst Jurgen Rohde, Robert Palmer, Matthew Akio Streshinsky, Marc Bohn, Torsten Wuth
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Patent number: 11070033Abstract: Conventional integrated optical amplifiers, which combine different types of platforms, e.g. silicon photonic integrated circuit for the device layer, and a Group III-V material for the gain medium, typically include a curved waveguide extending through the gain medium coupled to waveguides in the main device layer. Unfortunately, the radius of curvature of the curved waveguide becomes a limiting factor for both size and amplification. Accordingly, an optical amplifier which eliminates the need for the curved waveguide by including a coupler for splitting an input optical signal into two sub-beams, for passage through the gain medium, and a reflector, such as a U-turn, for reflecting or redirecting the two sub-beams back through the gain medium to the coupler for recombination, would be a welcome improvement. A phase tuner may also be provided to ensure coherence cancellation between the two sub-beams to maximize output and minimize back reflection without requiring an isolator.Type: GrantFiled: February 28, 2019Date of Patent: July 20, 2021Assignee: Nokia Solutions & Networks OyInventors: Thomas Wetteland Baehr-Jones, Saeed Fathololoumi, Yangjin Ma
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Patent number: 11036004Abstract: A compact, low-loss and wavelength insensitive Y-junction for submicron silicon waveguides. The design was performed using FDTD and particle swarm optimization (PSO). The device was fabricated in a 248 nm CMOS line. Measured average insertion loss is 0.28±0.02 dB across an 8-inch wafer. The device footprint is less than 1.2 ?m×2 ?m, orders of magnitude smaller than MMI and directional couplers.Type: GrantFiled: December 10, 2018Date of Patent: June 15, 2021Assignee: Nokia Solutions & Networks OyInventors: Yang Liu, Yangjin Ma, Ruizhi Shi, Michael J. Hochberg, Yi Zhang, Shuyu Yang, Thomas Wetteland Baehr-Jones
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Publication number: 20210049245Abstract: Systems and methods for computer simulation for determining a field generated from a source, with the field interacting with one or more structures. The systems and methods comprise dividing a domain into subdomains, solving iteratively for the field in a subset of the subdomains by solving for a residual field within an extended subdomain around each subdomain within the subset. If the subdomain comprises a structure, the boundary of the structure extends beyond the boundary of the extended subdomain to a second extended subdomain.Type: ApplicationFiled: August 16, 2019Publication date: February 18, 2021Inventor: Thomas Wetteland Baehr-Jones
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Patent number: 10873400Abstract: Described are various embodiments of a dual optical modulator, system and method. In one embodiment, an optical modulator modulates an input optical signal having a designated optical frequency. The modulator comprises first and second tunable modulators operable around the optical frequency and operatively disposed between a bus waveguide path and an opposed waveguide path. The modulator further comprises a relative optical phase-shifter optically coupled between the tunable modulators so to impart a relative optical phase shift between the bus waveguide path and the opposed waveguide path. The tunable modulators are respectively driveable to modulate a respective resonance thereof in complimentary directions relative to the optical frequency and thereby resonantly redirect a selectable portion of the input optical signal along the opposed waveguide path such that the relative optical phase shift is imparted thereto for output.Type: GrantFiled: January 28, 2020Date of Patent: December 22, 2020Assignee: Elenion Technologies, LLCInventors: Thomas Wetteland Baehr-Jones, Michael J. Hochberg, Yang Liu
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Patent number: 10802218Abstract: An optical device and a method of manufacturing an optical device, including a ridge waveguide second, and a strip-loaded ridge waveguide section, comprises applying two different protective layers and two separate etches at two different depths. The protective layers overlap to protect the same section of the optical device, and to limit the surfaces of optical device to exposure to multiple etches, except at edges where the protective layers overlap.Type: GrantFiled: May 29, 2019Date of Patent: October 13, 2020Assignee: Elenion Technologies, LLCInventors: Thomas Wetteland Baehr-Jones, Ruizhi Shi
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Patent number: 10788679Abstract: A path-switchable dual polarization controller includes an input polarization beam splitter (PBS) switchably connected to either one of two optical controllers configured to tunably remix polarization components received from the PBS to obtain two target polarization components of input light. When one of the optical controllers requires a reset, PBS outputs are switched to the other optical controller, and the first optical controller is reset offline. The circuit may be used for polarization demultiplexing.Type: GrantFiled: December 13, 2017Date of Patent: September 29, 2020Assignee: Elenion Technologies, LLCInventors: Thomas Wetteland Baehr-Jones, Rafid Antoon Sukkar, Richard C. Younce
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Publication number: 20200272019Abstract: Conventionally, wavelength locking and monitoring has been achieved used various components, including calibrated etalon filters, gratings, and arrays of color filters, which offer fairly bulky solutions that require complicated controls. An improved on-chip wavelength monitor comprises: a combination comb filter comprising a plurality of comb filters, each for receiving a test beams, and each comb filter including a substantially different FSR, e.g. 10× to 20× the next closest FSR. A controller dithers a phase tuning section of each comb filter to generate a maximum or minimum output in a corresponding photodetector indicative of the wavelength of the test signal.Type: ApplicationFiled: May 12, 2020Publication date: August 27, 2020Inventors: Yang Liu, Yangjin Ma, Ran Ding, Thomas Wetteland Baehr-Jones, Saeed Fathololoumi, Kishore Padmaraju
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Publication number: 20200241332Abstract: An optical modulator apparatus may include a plurality of segment drivers, each segment driver having a unique offset voltage and driving but a portion or a segment of an electro-optical modulator. A modulating electrical signal may be applied to the segment drivers via a plurality of electrical delays. Parameters of the segment drivers may be selected so as to approximate a pre-defined transfer function, which may include a linear or a non-linear transfer function.Type: ApplicationFiled: April 13, 2020Publication date: July 30, 2020Inventors: Ran Ding, Thomas Wetteland Baehr-Jones, Peter D. Magill, Michael J. Hochberg, Alexander Rylyakov
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Patent number: 10693563Abstract: An optical IQ demodulator that does not require a power-consuming DSP is disclosed. A DC offset is added to one of the I and Q optical signal components at an IQ transmitter. After mixing with an LO signal and differential detection at the receiver, this DC offset results in a heterodyne-frequency tone in each of the quadrature detection channels of the receiver. The phase of this oscillation is recovered using a PLL circuit, which output is used to separate the transmitter I and Q channels for decoding thereof using conventional electronics.Type: GrantFiled: January 13, 2020Date of Patent: June 23, 2020Assignee: Elenion Technologies, LLCInventor: Thomas Wetteland Baehr-Jones
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Publication number: 20200186253Abstract: A distributed traveling-wave Mach-Zehnder modulator driver having a plurality of modulation stages that operate cooperatively (in-phase) to provide a signal suitable for use in a 100 Gb/s optical fiber transmitter at power levels that are compatible with conventional semiconductor devices and conventional semiconductor processing is described.Type: ApplicationFiled: November 28, 2019Publication date: June 11, 2020Inventors: Ran Ding, Thomas Wetteland Baehr-Jones, Michael J. Hochberg, Alexander Rylyakov
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Patent number: 10680410Abstract: Practical silicon-based light sources are still missing, despite the progress in germanium lasers, because both silicon and germanium are indirect-band semiconductors and inefficient at light generation. A tunable and single mode external cavity laser comprising: a gain medium for generating light between a reflective surface at one end of the gain medium; and a wavelength selective reflector at the other end of a laser cavity. A splitter disposed in the laser cavity includes an input port optically coupled to the gain medium, an input/output port optically coupled to the wavelength selective reflector, and an output port for outputting laser light at selected wavelengths. The wavelength selective reflector reflects light of one or more selected periodic wavelengths back to the gain medium via the input/output port, and passes light of non-selected wavelengths out of the laser cavity.Type: GrantFiled: October 28, 2019Date of Patent: June 9, 2020Assignee: Elenion Technologies, LLCInventors: Yangjin Ma, Yang Liu, Ruizhi Shi, Thomas Wetteland Baehr-Jones, Saeed Fathololoumi
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Patent number: 10670939Abstract: Conventionally, wavelength locking and monitoring has been achieved used various components, including calibrated etalon filters, gratings, and arrays of color filters, which offer fairly bulky solutions that require complicated controls. An improved on-chip wavelength monitor comprises: a combination comb filter comprising a plurality of comb filters, each for receiving a test beams, and each comb filter including a substantially different FSR, e.g. 10× to 20× the next closest FSR. A controller dithers a phase tuning section of each comb filter to generate a maximum or minimum output in a corresponding photodetector indicative of the wavelength of the test signal.Type: GrantFiled: December 27, 2017Date of Patent: June 2, 2020Assignee: Elenion Technologies, LLCInventors: Yang Liu, Yangjin Ma, Ran Ding, Thomas Wetteland Baehr-Jones, Saeed Fathololoumi, Kishore Padmaraju
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Publication number: 20200169325Abstract: Described are various embodiments of a dual optical modulator, system and method. In one embodiment, an optical modulator modulates an input optical signal having a designated optical frequency. The modulator comprises first and second tunable modulators operable around the optical frequency and operatively disposed between a bus waveguide path and an opposed waveguide path. The modulator further comprises a relative optical phase-shifter optically coupled between the tunable modulators so to impart a relative optical phase shift between the bus waveguide path and the opposed waveguide path. The tunable modulators are respectively driveable to modulate a respective resonance thereof in complimentary directions relative to the optical frequency and thereby resonantly redirect a selectable portion of the input optical signal along the opposed waveguide path such that the relative optical phase shift is imparted thereto for output.Type: ApplicationFiled: January 28, 2020Publication date: May 28, 2020Inventors: Thomas Wetteland Baehr-Jones, Michael J. Hochberg, Yang Liu
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Patent number: 10666016Abstract: Higher power tunable lasers are feasible using photonics integrated circuit based external cavity laser configurations by using multiple RSOAs inside a single cavity to provide multiple on-chip coherent optical output at the same wavelength. The total collective output power in various output branches potentially adds up being higher than what commercial lasers can provide. Using multiple RSOA increases and distributes the number of gain materials, which keeps them in a linear regime and avoids available gain saturation, which thereby removes gain saturation limitation in optical amplifications.Type: GrantFiled: May 9, 2018Date of Patent: May 26, 2020Assignee: Elenion Technologies, LLCInventors: Thomas Wetteland Baehr-Jones, Saeed Fathololoumi