Patents by Inventor Alan Nilsson
Alan Nilsson 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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Patent number: 8705904Abstract: Consistent with the present disclosure, optical devices are provided along different optical paths in a photonic integrated circuit (PIC). The optical components have different optical losses associated therewith so that optical signals propagating in the optical paths have desired power levels, which may be uniform, for example.Type: GrantFiled: November 1, 2008Date of Patent: April 22, 2014Assignee: Infinera CorporationInventors: Fred A. Kish, Jr., Mehrdad Ziari, Radhakrishnan L. Nagarajan, Masaki Kato, Vincent G. Dominic, Sanjeev Murthy, Alan Nilsson
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Publication number: 20090175573Abstract: Consistent with the present disclosure, optical devices are provided along different optical paths in a photonic integrated circuit (PIC). The optical components have different optical losses associated therewith so that optical signals propagating in the optical paths have desired power levels, which may be uniform, for example.Type: ApplicationFiled: November 1, 2008Publication date: July 9, 2009Inventors: Fred A. Kish, JR., Mehrdad Ziari, Radhakrishnan L. Nagarajan, Masaki Kato, Vincent G. Dominic, Sanjeev Murthy, Alan Nilsson
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Publication number: 20080031626Abstract: A photonic integrated circuit (PIC) chip comprising an array of modulated sources, each providing a modulated signal output at a channel wavelength different from the channel wavelength of other modulated sources and a wavelength selective combiner having an input optically coupled to received all the signal outputs from the modulated sources and provide a combined output signal on an output waveguide from the chip. The modulated sources, combiner and output waveguide are all integrated on the same chip.Type: ApplicationFiled: October 9, 2007Publication date: February 7, 2008Applicant: INFINERA CORPORATIONInventors: David Welch, Vincent Dominic, Fred Kish, Mark Missey, Radhakrishnan Nagarajan, Atul Mathur, Frank Peters, Robert Taylor, Matthew Mitchell, Alan Nilsson, Stephen Grubb, Richard Schneider, Charles Joyner, Jonas Webjorn, Ting-Kuang Chiang, Robert Grencavich, Vinh Nguyen, Donald Pavinski, Marco Sosa
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Publication number: 20080013881Abstract: A photonic integrated circuit (PIC) chip comprising an array of modulated sources, each providing a modulated signal output at a channel wavelength different from the channel wavelength of other modulated sources and a wavelength selective combiner having an input optically coupled to received all the signal outputs from the modulated sources and provide a combined output signal on an output waveguide from the chip. The modulated sources, combiner and output waveguide are all integrated on the same chip.Type: ApplicationFiled: July 6, 2007Publication date: January 17, 2008Applicant: INFINERA CORPORATIONInventors: David Welch, Vincent Dominic, Fred Kish, Mark Missey, Radhakrishnan Nagarajan, Atul Mathur, Frank Peters, Robert Taylor, Matthew Mitchell, Alan Nilsson, Stephen Grubb, Richard Schneider, Charles Joyner, Jonas Webjorn, Drew Perkins
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Publication number: 20070248299Abstract: A photonic integrated circuit (PIC) chip comprising an array of modulated sources, each providing a modulated signal output at a channel wavelength different from the channel wavelength of other modulated sources and a wavelength selective combiner having an input optically coupled to received all the signal outputs from the modulated sources and provide a combined output signal on an output waveguide from the chip. The modulated sources, combiner and output waveguide are all integrated on the same chip.Type: ApplicationFiled: June 21, 2007Publication date: October 25, 2007Applicant: INFINERA CORPORATIONInventors: David Welch, Vincent Dominic, Fred Kish, Mark Missey, Radhakrishnan Nagarajan, Atul Mathur, Frank Peters, Robert Taylor, Matthew Mitchell, Alan Nilsson, Stephen Grubb, Richard Schneider, Charles Joyner, Jonas Webjorn, Drew Perkins
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Publication number: 20070242918Abstract: A photonic integrated circuit (PIC) chip comprising an array of modulated sources, each providing a modulated signal output at a channel wavelength different from the channel wavelength of other modulated sources and a wavelength selective combiner having an input optically coupled to received all the signal outputs from the modulated sources and provide a combined output signal on an output waveguide from the chip. The modulated sources, combiner and output waveguide are all integrated on the same chip.Type: ApplicationFiled: June 20, 2007Publication date: October 18, 2007Applicant: INFINERA CORPORATIONInventors: David Welch, Vincent Dominic, Fred Kish, Mark Missey, Radhakrishnan Nagarajan, Atul Mathur, Frank Peters, Robert Taylor, Matthew Mitchell, Alan Nilsson, Stephen Grubb, Richard Schneider, Charles Joyner, Jonas Webjorn, Drew Perkins
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Publication number: 20070242919Abstract: A photonic integrated circuit (PIC) chip comprising an array of modulated sources, each providing a modulated signal output at a channel wavelength different from the channel wavelength of other modulated sources and a wavelength selective combiner having an input optically coupled to received all the signal outputs from the modulated sources and provide a combined output signal on an output waveguide from the chip. The modulated sources, combiner and output waveguide are all integrated on the same chip.Type: ApplicationFiled: June 22, 2007Publication date: October 18, 2007Applicant: INFINERA CORPORATIONInventors: David Welch, Vincent Dominic, Fred Kish, Mark Missey, Radhakrishnan Nagarajan, Atul Mathur, Frank Peters, Robert Taylor, Matthew Mitchell, Alan Nilsson, Stephen Grubb, Richard Schneider, Charles Joyner, Jonas Webjorn, Drew Perkins
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Publication number: 20070201785Abstract: Electro-optic amplitude varying elements (AVEs) or electro-optic multi-function elements (MFEs) are integrated into signal channels of photonic integrated circuits (PICs) or at the output of such PICs to provide for various optical controlling and monitoring functions. In one case, such PIC signal channels may minimally include a laser source and a modulator (TxPIC) and in another case, may minimally include a photodetector to which channels, in either case, an AVE or an MFE may be added.Type: ApplicationFiled: November 3, 2006Publication date: August 30, 2007Applicant: INFINERA CORPORATIONInventors: David Welch, Fred Kish, Radhakrishnan Nagarajan, Alan Nilsson, Robert Taylor
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Publication number: 20070172169Abstract: An optical transmitter comprises a monolithic transmitter photonic integrated circuit (TxPIC) chip that includes an array of modulated sources formed on the PIC chip and having different operating wavelengths approximating a standardized wavelength grid and providing signal outputs of different wavelengths. A wavelength selective combiner is formed on the PIC chip having a wavelength grid passband response approximating the wavelength grid of the standardized wavelength grid. The signal outputs of the modulated sources optically coupled to inputs of the wavelength selective combiner to produce a combined signal output from the combiner. A first wavelength tuning element coupled to each of the modulated sources and a second wavelength tuning element coupled to the wavelength selective combiner. A wavelength monitoring unit is coupled to the wavelength selective combiner to sample the combined signal output.Type: ApplicationFiled: March 29, 2007Publication date: July 26, 2007Applicant: INFINERA CORPORATIONInventors: Fred Kish, Charles Joyner, David Welch, Robert Taylor, Alan Nilsson
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Publication number: 20070127864Abstract: Electro-optic amplitude varying elements (AVEs) or electro-optic multi-function elements (MFEs) are integrated into signal channels of photonic integrated circuits (PICs) or at the output of such PICs to provide for various optical controlling and monitoring functions. In one case, such PIC signal channels may minimally include a laser source and a modulator (TxPIC) and in another case, may minimally include a photodetector to which channels, in either case, an AVE or an MFE may be added.Type: ApplicationFiled: February 3, 2007Publication date: June 7, 2007Applicant: INFINERA CORPORATIONInventors: David Welch, Fred Kish, Radhakrishnan Nagarajan, Alan Nilsson, Robert Taylor
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Publication number: 20070092177Abstract: A transmissive active channel element is provided in each signal channel of a monolithic multi-channel TxPIC where each channel also includes a modulated source. The active channel element functions both as a power control element for both monitoring and regulating the output channel signal level of each signal channel and as a modulator for channel wavelength tagging or labeling to provide for wavelength locking the modulated sources. The power regulating function is also employed to control the channel signal power outputs of each channel to be uniform across the channel signal array. All of these functions are carried out by a feedback loop utilizing digital signal processing.Type: ApplicationFiled: June 29, 2006Publication date: April 26, 2007Applicant: INFINERA CORPORATIONInventors: Alan Nilsson, Robert Smith, Yishai Kagan, Paul Freeman
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Publication number: 20070019901Abstract: A method of tuning optical components integrated on a monolithic semiconductor chip having a plurality of first optical components integrated on the chip with each fabricated to approximate an emission wavelength along a given wavelength grid and together forming a first optical component wavelength grid. A second optical component is integrated on the chip with and optically coupled to the group of first optical components. The second optical component has a second optical component wavelength grid approximating the given wavelength grid where at least one emission peak along the second optical component wavelength grid is within an acceptable wavelength tolerance range of a particular first optical component of the first optical component wavelength grid but not the same as a corresponding emission wavelength of a particular first optical component.Type: ApplicationFiled: July 3, 2006Publication date: January 25, 2007Applicant: Infinera CorporationInventors: Fred Kish, Charles Joyner, David Welch, Robert Taylor, Alan Nilsson
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Publication number: 20070014509Abstract: An optical transmitter comprises an array of modulated sources having different operating wavelengths approximating a standardized wavelength grid and providing signal outputs of different wavelengths. Signal outputs of the modulated sources are optically coupled to inputs of the wavelength selective combiner to produce a combined signal output from the combiner. The wavelength selective combiner has a wavelength grid passband response approximating the wavelength grid of the standardized wavelength grid. A first wavelength tuning element is coupled to each of the modulated sources and a second wavelength tuning element is coupled to the wavelength selective combiner. A wavelength monitoring unit is coupled to receive a sampled portion the combined signal output from the wavelength selective combiner. A wavelength control system is coupled to the first and second wavelength tuning elements and to the wavelength monitoring unit to receive the sampled portion of the combined signal output.Type: ApplicationFiled: August 9, 2006Publication date: January 18, 2007Applicant: INFINERA CORPORATIONInventors: Fred Kish, Charles Joyner, David Welch, Robert Taylor, Alan Nilsson
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Publication number: 20070003281Abstract: A system, apparatus and method are described for deployment of a control loop between optical or electro-optical modules and a multiplexing module to provide a desired power profile of banded optical channel groups. The power output characteristics of the optical or electro-optical modules, the properties of the transmission paths of the banded optical channel groups, and other factors may be analyzed to allow the control loop to achieve the desired power profile on the banded optical channel groups. The control loop may adjust the output power on the optical or electro-optical modules so that the banded optical channel groups are delivered to an optical component, such as an optical multiplexer or photo-detector, having a particular optical power profile.Type: ApplicationFiled: June 22, 2006Publication date: January 4, 2007Applicant: INFINERA CORPORATIONInventors: Matthew Mitchell, Robert Taylor, Vincent Dominic, Alan Nilsson
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Publication number: 20060182441Abstract: A method and apparatus operates an array of laser sources as an integrated array on a single substrate or as integrated in an optical transmitter photonic integrated circuit (TxPIC) maintaining the emission wavelengths of such integrated laser sources at their targeted emission wavelengths or at least to more approximate their desired respective emission wavelengths. Wavelength changing elements may accompany the laser sources to bring about the change in their operational or emission wavelength to be corrected to or toward the desired or target emission wavelength. The wavelength changing elements may be comprise of temperature changing elements, current and voltage changing elements or bandgap changing elements.Type: ApplicationFiled: March 28, 2006Publication date: August 17, 2006Applicant: Infinera CorporationInventors: Fred Kish, Charles Joyner, David Welch, Robert Taylor, Alan Nilsson
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Publication number: 20060093362Abstract: Electro-optic amplitude varying elements (AVEs) or electro-optic multi-function elements (MFEs) are integrated into signal channels of photonic integrated circuits (PICs) or at the output of such PICs to provide for various optical controlling and monitoring functions. In one case, such PIC signal channels may minimally include a laser source and a modulator (TxPIC) and in another case, may minimally include a photodetector to which channels, in either case, an AVE or an MFE may be added.Type: ApplicationFiled: November 7, 2005Publication date: May 4, 2006Applicant: Infinera CorporationInventors: David Welch, Fred Kish, Radhakrishnan Nagarajan, Alan Nilsson, Robert Taylor
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Publication number: 20060062519Abstract: An optical transmitter comprises a monolithic transmitter photonic integrated circuit (TxPIC) chip that includes an array of modulated sources formed on the PIC chip and having different operating wavelengths approximating a standardized wavelength grid and providing signal outputs of different wavelengths. A wavelength selective combiner is formed on the PIC chip having a wavelength grid passband response approximating the wavelength grid of the standardized wavelength grid. The signal outputs of the modulated sources optically coupled to inputs of the wavelength selective combiner to produce a combined signal output from the combiner. A first wavelength tuning element coupled to each of the modulated sources and a second wavelength tuning element coupled to the wavelength selective combiner. A wavelength monitoring unit is coupled to the wavelength selective combiner to sample the combined signal output.Type: ApplicationFiled: November 14, 2005Publication date: March 23, 2006Applicant: Infinera CorporationInventors: Fred Kish, Charles Joyner, David Welch, Robert Taylor, Alan Nilsson
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Publication number: 20050286909Abstract: An optical transmitter comprises a monolithic transmitter photonic integrated circuit (TxPIC) chip that includes an array of modulated sources formed on the PIC chip and having different operating wavelengths approximating a standardized wavelength grid and providing signal outputs of different wavelengths. A wavelength selective combiner is formed on the PIC chip having a wavelength grid passband response approximating the wavelength grid of the standardized wavelength grid. The signal outputs of the modulated sources optically coupled to inputs of the wavelength selective combiner to produce a combined signal output from the combiner. A first wavelength tuning element coupled to each of the modulated sources and a second wavelength tuning element coupled to the wavelength selective combiner. A wavelength monitoring unit is coupled to the wavelength selective combiner to sample the combined signal output.Type: ApplicationFiled: August 17, 2005Publication date: December 29, 2005Applicant: Infinera CorporationInventors: Fred Kish, Charles Joyner, David Welch, Robert Taylor, Alan Nilsson
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Publication number: 20050084202Abstract: A power monitoring and correction to a desired power level of a laser or group of lasers utilizes two photodetectors which are employed to accurately determine the amount of output power from the front end or “customer” end of a laser or a plurality of such lasers. During power detection, which may be accomplished intermittently or continuously, the laser is modulated with a tone of low frequency modulation. One photodetector at the rear of the laser is employed to detect the DC value of the frequency tone, i.e., a value or number representative of the AC peak-to-peak swing, amplitude or modulation depth of the tone. Also, the rear photodetector may be employed to determine the optical modulation index (OMI). In either case, these values may be employed in a closed loop feedback system to adjust or otherwise calibrate the value of the low tone frequency relative to the total desired bias current applied to the laser.Type: ApplicationFiled: October 8, 2004Publication date: April 21, 2005Applicant: Infinera CorporationInventors: Robert Smith, Alan Nilsson
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Publication number: 20050025409Abstract: A photonic integrated circuit (PIC) chip with a plurality of electro-optic components formed on a major surface of the chip and a submount that includes a substrate that extends over the major surface of the chip forming an air gap between the substrate and the major surface, the substrate to support electrical leads for electrical connection to some of the electro-optic components on the chip major surface.Type: ApplicationFiled: May 25, 2004Publication date: February 3, 2005Applicant: Infinera CorporationInventors: David Welch, Vincent Dominic, Fred Kish, Mark Missey, Radhakrishnan Nagarajan, Atul Mathur, Frank Peters, Robert Taylor, Matthew Mitchell, Alan Nilsson, Stephen Grubb, Richard Schneider, Charles Joyner, Jonas Webjorn, Ting-Kuang Chiang, Robert Grencavich, Vinh Nguyen, Donald Pavinski, Marco Sosa