Patents by Inventor Amir Jafari
Amir Jafari 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: 10898753Abstract: In one embodiment, an adjustable surface stiffness treadmill includes a treadmill unit, a scissor mechanism that supports the treadmill unit, a stiffness adjustment mechanism configured to adjust a vertical stiffness of the treadmill unit, and an input link having a first end and a second end, the first end being connected to the scissor mechanism and the second end being connected to the stiffness adjustment mechanism, wherein the input link translates downward vertical forces imposed upon the treadmill unit into horizontal forces imposed upon the stiffness adjustment mechanism.Type: GrantFiled: May 31, 2019Date of Patent: January 26, 2021Assignee: Board Of Regents, The University of Texas SystemInventor: Amir Jafari
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Publication number: 20200366377Abstract: Techniques are described for implementing an out-of-band communication channel used to exchange control channel information in sub-carrier-based optical communication systems. In an example implementation, an apparatus includes laser operable to supply an optical signal, a digital signal processor operable to supply digital signals, a digital to analog circuitry operable to provide analog signals based on the digital signals, and driver circuitry is coupled to the digital to analog circuitry and operable to supply at least one drive signal. The apparatus also includes a modulator operable to receive said at least one drive signal, modulate the optical signal based on said at least one drive signal to provide a plurality of optical subcarriers, amplitude modulate the plurality of optical subcarriers at a first frequency to carry first control information, and modulate the plurality of subcarriers at a second frequency to carry second control information.Type: ApplicationFiled: September 20, 2019Publication date: November 19, 2020Inventors: Amir Jafari, Steven J. Hand, Mohamed Osman
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Publication number: 20200366378Abstract: Techniques are described for implementing an out-of-band communication channel used to exchange control channel information in sub-carrier-based optical communication systems. In an example implementation, a transmitter includes a laser operable to supply an optical signal, a digital signal processor operable to supply first electrical signals based on first data input to the digital signal processor and second data input to the digital signal processor, digital-to-analog conversion circuitry operable to output second electrical signals based on the first electrical signals, modulator driver circuitry is operable to output third electrical signals based on the second electrical signals, and an optical modulator operable to supply first and second modulated optical signals based on the third electrical signals. The first modulated optical signal includes a plurality of optical subcarriers carrying user data. The second modulated optical signal is polarization modulated based on the second data.Type: ApplicationFiled: September 20, 2019Publication date: November 19, 2020Inventors: Amir Jafari, Steven J. Hand, Mohamed Osman
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Publication number: 20200363590Abstract: Techniques are described for implementing an out-of-band communication channel used to exchange control channel information in sub-carrier-based optical communication systems. In an example implementation, an apparatus includes an optical tap coupled to an optical communication path carrying a modulated optical signal carrying a plurality of optical subcarriers. The optical tap has a first output configured to supply a first portion of the modulated optical signal and a second output configured to supply a second portion of the modulated optical signal. The plurality of optical subcarriers are amplitude modulated based on control data at a first frequency, and each of the plurality of optical subcarriers is modulated to carry user data at a second frequency greater than the first frequency. The apparatus is configured to supply the control based on the first portion of the modulated optical signal.Type: ApplicationFiled: September 20, 2019Publication date: November 19, 2020Inventors: Amir Jafari, Steven J. Hand, Mohamed Osman
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Publication number: 20200366379Abstract: Techniques are described for implementing an out-of-band communication channel used to exchange control channel information in sub-carrier-based optical communication systems. In an example implementation, an optical communication system includes a primary transceiver, a component, and secondary transceivers. The primary transceiver is operable to supply first optical subcarriers to an optical communication path, the first optical subcarriers being amplitude modulated at a first frequency to carry first control information and amplitude modulated at a second frequency to carry second control information. The component is operable to be coupled to the optical communication path and includes circuitry operable to detect the first control information. The secondary transceivers are coupled to a terminal end of the optical communication path. At least one of the secondary transceivers is operable to detect the second control information and block the first control information.Type: ApplicationFiled: September 20, 2019Publication date: November 19, 2020Inventors: Amir Jafari, Steven J. Hand, Mohamed Osman
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Publication number: 20200287621Abstract: A transmitter can include a laser operable to output an optical signal; a digital signal processor operable to receive user data and provide electrical signals based on the data; and a modulator operable to modulate the optical signal to provide optical subcarriers based on the electrical signals. A first one of the subcarriers carriers carries first TDMA encoded information and second TDMA encoded information, such that the first TDMA encoded information is indicative of a first portion of the data and is carried by the first one of the subcarriers during a first time slot, and the second TDMA encoded information is indicative of a second portion of the data and is carried by the first one of the subcarriers during a second time slot. The first TDMA encoded information is associated with a first node remote from the transmitter and the second TDMA encoded information is associated with a second node remote from the transmitter.Type: ApplicationFiled: March 4, 2020Publication date: September 10, 2020Inventors: Amir Jafari, Kuang-Tsan Wu, David F. Welch, Steven Joseph Hand, Mohamed Osman
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Publication number: 20200287649Abstract: Consistent the present disclosure, a network or system is provided in which a hub or primary node may communication with a plurality of leaf or secondary nodes. The hub node may operate or have a capacity that may be greater than that of the leaf nodes. Accordingly, relatively inexpensive leaf nodes may be deployed that receive data carrying optical signals from and supply data carrying optical signals to the hub node. One or more connections may couple each leaf node to the hub node, whereby each connection may include one or more spans or segments of optical fibers, optical amplifiers, and optical add/drop multiplexer, for example. Consistent with an aspect of the present disclosure, optical subcarriers may be transmitted over such connections. The subcarriers may be generated by a combination of a laser and a modulator, such that multiple lasers and modulators are not required, and costs may be reduced.Type: ApplicationFiled: March 4, 2020Publication date: September 10, 2020Inventors: Amir Jafari, David F. Welch, Steven Joseph Hand, Mohamed Osman
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Publication number: 20200287648Abstract: Consistent the present disclosure, a network or system is provided in which a hub or primary node may communication with a plurality of leaf or secondary nodes. The hub node may operate or have a capacity that may be greater than that of the leaf nodes. Accordingly, relatively inexpensive leaf nodes may be deployed that receive data carrying optical signals from and supply data carrying optical signals to the hub node. One or more connections may couple each leaf node to the hub node, whereby each connection may include one or more spans or segments of optical fibers, optical amplifiers, and optical add/drop multiplexer, for example. Consistent with an aspect of the present disclosure, optical subcarriers may be transmitted over such connections. The subcarriers may be generated by a combination of a laser and a modulator, such that multiple lasers and modulators are not required, and costs may be reduced.Type: ApplicationFiled: March 4, 2020Publication date: September 10, 2020Inventors: Amir Jafari, David F. Welch, Steven Joseph Hand, Mohamed Osman
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Publication number: 20200287651Abstract: A transmitter can include a laser operable to output an optical signal; a digital signal processor operable to receive data and provide a plurality of electrical signals based on the data; and a modulator operable to modulate the optical signal to provide a plurality of optical subcarriers based on the plurality of electrical signals. One of the plurality of subcarriers carries first information indicative of a first portion of the data in a first time slot and second information indicative of a second portion of the data in a second time slot. The first information is associated with a first node remote from the transmitter and the second information is associated with a second node remote from the transmitter. A receiver as well as a system also are described.Type: ApplicationFiled: March 4, 2020Publication date: September 10, 2020Inventors: Amir Jafari, Kuang-Tsan Wu, David F. Welch, Steven Joseph Hand, Mohamed Osman
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Publication number: 20200139538Abstract: In one embodiment, a mechanically over-damped actuator includes an output link comprising a lever and a torsion spring associated with the lever, wherein the lever has an initial equilibrium position and is pivotable about a pivot axis, wherein the spring opposes pivoting of the lever away from its initial equilibrium position such that the spring tends to return the lever to the equilibrium position.Type: ApplicationFiled: November 5, 2019Publication date: May 7, 2020Applicant: Board of Regents, The University of Texas SystemInventor: Amir Jafari
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Publication number: 20200003088Abstract: In one embodiment, an electromagnetic soft actuator includes a first soft outer member comprising a soft internal electrically conductive coil, a second soft outer member comprising a soft internal electrically conductive coil, and a soft inner shaft on which the first and second soft outer members are mounted, the first and second soft outer members being linearly displaceable along a length of the soft inner shaft, the soft inner shaft comprising a permanent magnet, wherein the first and second outer members linearly move under an electromagnetic force relative to the soft inner shaft and each other when an electric current is applied to the soft internal electrically conductive coils.Type: ApplicationFiled: June 28, 2019Publication date: January 2, 2020Applicant: Board of Regents, The University of Texas SystemInventors: Amir Jafari, Nafiseh Ebrahimi
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Publication number: 20190366152Abstract: In one embodiment, an adjustable surface stiffness treadmill includes a treadmill unit, a scissor mechanism that supports the treadmill unit, a stiffness adjustment mechanism configured to adjust a vertical stiffness of the treadmill unit, and an input link having a first end and a second end, the first end being connected to the scissor mechanism and the second end being connected to the stiffness adjustment mechanism, wherein the input link translates downward vertical forces imposed upon the treadmill unit into horizontal forces imposed upon the stiffness adjustment mechanism.Type: ApplicationFiled: May 31, 2019Publication date: December 5, 2019Applicant: Board of Regents, The University of Texas SystemInventor: Amir Jafari
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Patent number: 9157485Abstract: A rotary joint (10; 110) includes an output member (12; 112) rotatable about a first axis of rotation (x1), a first actuator device (14) arranged to generate a rotary motion about the first axis (x1), an input member (16; 116) driven by the first actuator device (14; 114) about the first axis (x1), elastic elements (20, 64; 120) between the input member (16; 116) and the output member (12; 112) and configured such that the transmission of the torque takes place via the elastic elements (20, 64; 120). A second actuator device (22; 122) is arranged to change the stiffness of the rotary joint (10; 110).Type: GrantFiled: September 23, 2011Date of Patent: October 13, 2015Assignee: FONDAZIONE ISTITUTO ITALIANO DI TECNOLOGIAInventors: Gianluca Pane, Nikos G. Tsagarakis, Amir Jafari, Darwin G. Caldwell
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Publication number: 20130178297Abstract: A rotary joint (10; 110) includes an output member (12; 112) rotatable about a first axis of rotation (x1), a first actuator device (14) arranged to generate a rotary motion about the first axis (x1), an input member (16; 116) driven by the first actuator device (14; 114) about the first axis (x1), elastic elements (20, 64; 120) between the input member (16; 116) and the output member (12; 112) and configured such that the transmission of the torque takes place via the elastic elements (20, 64; 120). A second actuator device (22; 122) is arranged to change the stiffness of the rotary joint (10; 110).Type: ApplicationFiled: September 23, 2011Publication date: July 11, 2013Applicant: FONDAZIONE ISTITUTO ITALIANO DI TECNOLOGIAInventors: Gianluca Pane, Nikos G. Tsagarakis, Amir Jafari, Darwin Caldwell