Patents by Inventor Evan L. Goldstein
Evan L. Goldstein 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: 7231147Abstract: An optical carrier drop/add transmission system and method for adding a signal to multiplexed input optical signals conveyed by an optical multiplex input line. The multiplexed input optical signals are demultiplexed to provide isolated input optical signals to an optical switch matrix comprising switches in an array of lines and column, the isolated input optical signals being inputted in a direction parallel to a line of switches in the optical switch matrix. The added optical signal is input in a direction parallel to a column in the optical switch matrix. An output line is selected and the switch that is on the column on which the added optical signal is inputted and on the selected output line is switched.Type: GrantFiled: July 25, 2005Date of Patent: June 12, 2007Assignee: AT&T Corp.Inventors: Evan L. Goldstein, Lih-Yuan Lin, Chuan Pu, Robert William Tkach
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Patent number: 7167611Abstract: A transparent optical switch includes network management and performance monitoring using bit level information obtained by extracting selected information on a polling basis and analyzing the extracted information in the electrical domain. In one embodiment, a signal is injected into the switch fabric of the switch via a demultiplexing device. The injected signal is extracted at the output of the switching fabric via an N:1 switch and analyzed by a signal analyzer to verify input to output connections. In another embodiment, an optical switch includes first and second switch fabrics for 1:2 broadcast capability. In a further embodiment, an optical communication system includes a plurality of optical networks and a plurality of optical switches that cooperate to generate unequipped signals and to obtain autonomously switch-to-switch port connectivity information required for auto-topology discovery.Type: GrantFiled: September 29, 2005Date of Patent: January 23, 2007Assignee: AT&T Corp.Inventors: Sid Chaudhuri, Evan L. Goldstein
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Patent number: 7158696Abstract: A transparent optical switch includes network management and performance monitoring using bit level information obtained by extracting selected information on a polling basis and analyzing the extracted information in the electrical domain. In one embodiment, a signal is injected into the switch fabric of the switch via a demultiplexing device. The injected signal is extracted at the output of the switching fabric via an N:1 switch and analyzed by a signal analyzer to verify input to output connections. In another embodiment, an optical switch includes first and second switch fabrics for 1:2 broadcast capability. In a further embodiment, an optical communication system includes a plurality of optical networks and a plurality of optical switches that cooperate to generate unequipped signals and to obtain autonomously switch-to-switch port connectivity information required for auto-topology discovery.Type: GrantFiled: February 15, 2005Date of Patent: January 2, 2007Assignee: AT & T Corp.Inventors: Sid Chaudhuri, Evan L. Goldstein
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Patent number: 6928244Abstract: An optical carrier drop/add transmission system and method for adding a signal to multiplexed input optical signals conveyed by an optical multiplex input line. The multiplexed input optical signals are demultiplexed to provide isolated input optical signals to an optical switch matrix comprising switches in an array of lines and columns, the isolated input optical signals being inputted in a direction parallel to a line of switches in the optical switch matrix. The added optical signal is input in a direction parallel to a column in the optical switch matrix. An output line is selected and the switch that is on the column on which the added optical signal is inputted and on the selected output line is switched.Type: GrantFiled: November 27, 2000Date of Patent: August 9, 2005Assignee: AT&T Corp.Inventors: Evan L. Goldstein, Lih-Yuan Lin, Chuan Pu, Robert William Tkach
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Patent number: 6862380Abstract: A transparent optical switch includes network management and performance monitoring using bit level information obtained by extracting selected information on a polling basis and analyzing the extracted information in the electrical domain. In one embodiment, a signal is injected into the switch fabric of the switch via a demultiplexing device. The injected signal is extracted at the output of the switching fabric via an N:1 switch and analyzed by a signal analyzer to verify input to output connections. In another embodiment, an optical switch includes first and second switch fabrics for 1:2 broadcast capability. In a further embodiment, an optical communication system includes a plurality of optical networks and a plurality of optical switches that cooperate to generate unequipped signals and to obtain autonomously switch-to-switch port connectivity information required for auto-topology discovery.Type: GrantFiled: February 1, 2001Date of Patent: March 1, 2005Assignee: AT&T Corp.Inventors: Sid Chaudhuri, Evan L. Goldstein
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Patent number: 6498673Abstract: The invention provides methods and systems for micro-machined tunable delay lines. Particularly, the micro-machined tunable delay lines of the present invention utilize adjustable micro-machined micro-mirrors to alter the path length traversed by an optical signal.Type: GrantFiled: January 4, 2001Date of Patent: December 24, 2002Assignee: AT&T Corp.Inventors: Nicholas J. Frigo, Evan L. Goldstein, Lih-Yuan Lin, Chuan Pu, Robert William Tkach
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Patent number: 6445485Abstract: Methods and systems for controlling the state of polarization of an optical beam using micro-machined devices are provided. By cascading a number of simple polarization state rotators integrated on a number of silicon substrates, the state of polarization of an optical beam can be effectively manipulated to any point on the Poincaré sphere.Type: GrantFiled: January 4, 2001Date of Patent: September 3, 2002Assignee: AT&T Corp.Inventors: Nicholas J. Frigo, Evan L. Goldstein, Lih-Yuan Lin, Chuan Pu, Robert William Tkach
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Patent number: 5392154Abstract: In a multiwavelength lightwave communications system automatic self-power regulation on a channel-by-channel basis is achieved with a cascade of multiwavelength amplifier modules (200), wherein each multiwavelength amplifier module in the cascade includes a plurality of pump-shared parallel fiber amplifiers (208) operated in gain-saturation and connected between an optical demultiplexer (203) and multiplexer (209). An optional first gain stage (202) improves performance with higher optical signal-to-noise ratio. By self-regulating the power in each channel, the communications system is scalable, allowing the system to grow without deleterious effects due to power spread.Type: GrantFiled: March 30, 1994Date of Patent: February 21, 1995Assignee: Bell Communications Research, Inc.Inventors: Gee-Kung Chang, Lars E. Eskildsen, Evan L. Goldstein, Muhammed Z. Iqbal, Chinlon Lin
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Patent number: 5345332Abstract: In a multiwavelength lightwave communications system channel-by-channel power regulation is achieved with a cascade of inhomogeneously broadened saturated fiber amplifiers spaced along the optical fiber transmission path. In the described embodiment, inhomogeneous broadening is achieved by immersing each of the erbiumdoped fiber amplifiers in the cascade in a bath of liquid nitrogen, thereby cooling each amplifier to approximately 77 K.Type: GrantFiled: May 3, 1993Date of Patent: September 6, 1994Assignee: Bell Communications Research, Inc.Inventors: Valeria L. daSilva, Lars E. Eskildsen, Evan L. Goldstein, Yaron Silberberg