Patents by Inventor Cecil D. Smith
Cecil D. Smith 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: 9191117Abstract: The present disclosure provides high-speed wavelength division multiplexing (WDM) transponders (e.g., 10 Gb/s, 40 Gb/s, 100 Gb/s, and beyond) that receive one or more optical signals and convert and/or remodulate the received optical signals onto a newly generated optical channel along with overhead processing/addition, forward error correction, and the like. In general, the transponders of the present invention include a client-side and a line-side, each with bi-directional optical transmission. The transponders provide an effective mechanism to support WDM networks that are transparent to the client-side.Type: GrantFiled: September 23, 2010Date of Patent: November 17, 2015Assignee: Ciena CorporationInventors: Stephen B. Alexander, Michael Y. Frankel, Steve W. Chaddick, Roy C. Litz, Cecil D. Smith
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Patent number: 8306424Abstract: The present invention provides a remodulating channel selector for a wavelength division multiplexed optical communication system. The remodulating selector receives a WDM input signal, selects a particular optical channel from the WDM signal and places the information from the selected signal onto a newly-generated optical output signal. The wavelength of the output optical signal can be the same as or different from one of the optical channels which comprises the WDM input signal. When used in a WDM optical communication system with remodulators at the transmission input, the remodulating selectors provide complete control over the interfaces with optical transmitters and receivers, permitting use with a broad range of optical equipment.Type: GrantFiled: August 24, 2010Date of Patent: November 6, 2012Assignee: Ciena CorporationInventors: Stephen B. Alexander, Steve W. Chaddick, Roy C. Litz, Cecil D. Smith
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Patent number: 7903981Abstract: The present invention provides a software-based electro-optic modulator bias control system resident in an optical transceiver including an electro-optic modulator that includes an optical-to-electrical converter including a transimpedance amplifier, an analog-to-digital converter, and a software algorithm, wherein the software algorithm is operable for determining an optimum bias voltage applied to the electro-optic modulator by discovering a maximum average optical power transmitted by the electro-optic modulator, or quadrature point, wherein the quadrature point is discovered by determining at what bias voltage the slope of an average optical power transmitted by the electro-optic modulator, defined as an optical power change given an incremental bias voltage change, is equal to zero.Type: GrantFiled: January 23, 2007Date of Patent: March 8, 2011Assignee: Ciena CorporationInventors: Steve S. Cho, Cecil D. Smith
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Publication number: 20110013911Abstract: The present disclosure provides high-speed wavelength division multiplexing (WDM) transponders (e.g., 10 Gb/s, 40 Gb/s, 100 Gb/s, and beyond) that receive one or more optical signals and convert and/or remodulate the received optical signals onto a newly generated optical channel along with overhead processing/addition, forward error correction, and the like. In general, the transponders of the present invention include a client-side and a line-side, each with bi-directional optical transmission. The transponders provide an effective mechanism to support WDM networks that are transparent to the client-side.Type: ApplicationFiled: September 23, 2010Publication date: January 20, 2011Inventors: Stephen B. Alexander, Michael Y. Frankel, Steve W. Chaddick, Roy C. Litz, Cecil D. Smith
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Publication number: 20100329682Abstract: The present invention provides a remodulating channel selector for a wavelength division multiplexed optical communication system. The remodulating selector receives a WDM input signal, selects a particular optical channel from the WDM signal and places the information from the selected signal onto a newly-generated optical output signal. The wavelength of the output optical signal can be the same as or different from one of the optical channels which comprises the WDM input signal. When used in a WDM optical communication system with remodulators at the transmission input, the remodulating selectors provide complete control over the interfaces with optical transmitters and receivers, permitting use with a broad range of optical equipment.Type: ApplicationFiled: August 24, 2010Publication date: December 30, 2010Inventors: Stephen B. Alexander, Steve W. Chaddick, Roy C. Litz, Cecil D. Smith
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Patent number: 7809270Abstract: The present invention provides a remodulating channel selector for a wavelength division multiplexed optical communication system. The remodulating selector receives a WDM input signal, selects a particular optical channel from the WDM signal and places the information from the selected signal onto a newly-generated optical output signal. The wavelength of the output optical signal can be the same as or different from one of the optical channels which comprises the WDM input signal. When used in a WDM optical communication system with remodulators at the transmission input, the remodulating selectors provide complete control over the interfaces with optical transmitters and receivers, permitting use with a broad range of optical equipment.Type: GrantFiled: April 8, 2008Date of Patent: October 5, 2010Assignee: Ciena CorporationInventors: Stephen B. Alexander, Steve W. Chaddick, Roy C. Litz, Cecil D. Smith
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Publication number: 20090041471Abstract: The present invention provides a remodulating channel selector for a wavelength division multiplexed optical communication system. The remodulating selector receives a WDM input signal, selects a particular optical channel from the WDM signal and places the information from the selected signal onto a newly-generated optical output signal. The wavelength of the output optical signal can be the same as or different from one of the optical channels which comprises the WDM input signal. When used in a WDM optical communication system with remodulators at the transmission input, the remodulating selectors provide complete control over the interfaces with optical transmitters and receivers, permitting use with a broad range of optical equipment.Type: ApplicationFiled: April 8, 2008Publication date: February 12, 2009Inventors: Stephen B. Alexander, Steve W. Chaddick, Roy C. Litz, Cecil D. Smith
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Publication number: 20080175598Abstract: The present invention provides a software-based electro-optic modulator bias control system resident in an optical transceiver including an electro-optic modulator that includes an optical-to-electrical converter including a transimpedance amplifier, an analog-to-digital converter, and a software algorithm, wherein the software algorithm is operable for determining an optimum bias voltage applied to the electro-optic modulator by discovering a maximum average optical power transmitted by the electro-optic modulator, or quadrature point, wherein the quadrature point is discovered by determining at what bias voltage the slope of an average optical power transmitted by the electro-optic modulator, defined as an optical power change given an incremental bias voltage change, is equal to zero.Type: ApplicationFiled: January 23, 2007Publication date: July 24, 2008Inventors: Steven S. Cho, Cecil D. Smith
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Patent number: 7369780Abstract: The present invention provides a remodulating channel selector for a wavelength division multiplexed optical communication system. The remodulating selector receives a WDM input signal, selects a particular optical channel from the WDM signal and places the information from the selected signal onto a newly-generated optical output signal. The wavelength of the output optical signal can be the same as or different from one of the optical channels which comprises the WDM input signal. When used in a WDM optical communication system with remodulators at the transmission input, the remodulating selectors provide complete control over the interfaces with optical transmitters and receivers, permitting use with a broad range of optical equipment.Type: GrantFiled: July 15, 2003Date of Patent: May 6, 2008Assignee: Ciena CorporationInventors: Stephen B. Alexander, Steve W. Chaddick, Roy C. Litz, Cecil D. Smith
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Publication number: 20040013433Abstract: The present invention provides a remodulating channel selector for a wavelength division multiplexed optical communication system. The remodulating selector receives a WDM input signal, selects a particular optical channel from the WDM signal and places the information from the selected signal onto a newly-generated optical output signal. The wavelength of the output optical signal can be the same as or different from one of the optical channels which comprises the WDM input signal. When used in a WDM optical communication system with remodulators at the transmission input, the remodulating selectors provide complete control over the interfaces with optical transmitters and receivers, permitting use with a broad range of optical equipment.Type: ApplicationFiled: July 15, 2003Publication date: January 22, 2004Applicant: CIENA CorporationInventors: Stephen B. Alexander, Steve W. Chaddick, Roy C. Litz, Cecil D. Smith
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Patent number: 6618176Abstract: The present invention provides a remodulating channel selector for a wavelength division multiplexed optical communication system. The remodulating selector receives a WDM input signal, selects a particular optical channel from the WDM signal and places the information from the selected signal onto a newly-generated optical output signal. The wavelength of the output optical signal can be the same as or different from one of the optical channels which comprises the WDM input signal. When used in a WDM optical communication system with remodulators at the transmission input, the remodulating selectors provide complete control over the interfaces with optical transmitters and receivers, permitting use with a broad range of optical equipment.Type: GrantFiled: February 26, 2001Date of Patent: September 9, 2003Assignee: Ciena CorporationInventors: Stephen B. Alexander, Steve W. Chaddick, Roy C. Litz, Cecil D. Smith
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Patent number: 6344915Abstract: The present invention provides a system and method for intelligently shutting down an optical energy source in a communication system having optical amplifiers upon detection of a system failure.Type: GrantFiled: June 19, 1998Date of Patent: February 5, 2002Assignee: Ciena CorporationInventors: Stephen B. Alexander, Cecil D. Smith, Roy C. Litz, Robert M. Corwin, John L. Shanton, III, Donald T. Newman
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Publication number: 20010013964Abstract: The present invention provides a remodulating channel selector for a wavelength division multiplexed optical communication system. The remodulating selector receives a WDM input signal, selects a particular optical channel from the WDM signal and places the information from the selected signal onto a newly-generated optical output signal. The wavelength of the output optical signal can be the same as or different from one of the optical channels which comprises the WDM input signal. When used in a WDM optical communication system with remodulators at the transmission input, the remodulating selectors provide complete control over the interfaces with optical transmitters and receivers, permitting use with a broad range of optical equipment.Type: ApplicationFiled: February 26, 2001Publication date: August 16, 2001Inventors: Stephen B. Alexander, Steve W. Chaddick, Roy C. Litz, Cecil D. Smith
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Patent number: 6233077Abstract: The present invention provides a remodulating channel selector for a wavelength division multiplexed optical communication system. The remodulating selector receives a WDM input signal, selects a particular optical channel from the WDM signal and places the information from the selected signal onto a newly-generated optical output signal. The wavelength of the output optical signal can be the same as or different from one of the optical channels which comprises the WDM input signal. When used in a WDM optical communication system with remodulators at the transmission input, the remodulating selectors provide complete control over the interfaces with optical transmitters and receivers, permitting use with a broad range of optical equipment.Type: GrantFiled: October 28, 1999Date of Patent: May 15, 2001Assignee: Ciena CorporationInventors: Stephen B. Alexander, Steve W. Chaddick, Roy C. Litz, Cecil D. Smith
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Patent number: 5784184Abstract: The present invention provides a WDM optical communication system with remodulators at the transmission input and remodulating channel selectors adjacent the optical receivers, providing complete control over the interfaces with optical transmission equipment. In an exemplary embodiment, the WDM system includes optical transmitters which input transmitted optical signals into optical remodulators. The optical remodulators place the information from each of the transmitted signals onto separate optical channels in the WDM system channel plan. The optical channels are multiplexed onto an optical waveguide. At the receive end, remodulating channel selectors each receive a portion of the WDM optical signal, select a particular optical channel, and place the information from the selected channel onto a newly-generated optical signal. This newly-generated optical signal is output to a receiver or to a further WDM optical system.Type: GrantFiled: June 24, 1996Date of Patent: July 21, 1998Assignee: CIENA CorporationInventors: Stephen B. Alexander, Steve W. Chaddick, Roy Litz, Cecil D. Smith
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Patent number: 5726784Abstract: A WDM optical communication system is described which is capable of placing information from incoming information-bearing optical signals onto N optical signal channels for conveyance over an optical waveguide. The optical system includes a first set of one or more optical transmitters, each of which emits an information-bearing optical signal at one or more transmission wavelengths, .lambda..sub.Ti. At least M optical receiving systems are provided, each receiving system configured to receive an information-bearing optical signal at a particular reception wavelength .lambda..sub.j, where M is a whole number greater than or equal to N and j is from 1 to M. Each receiving system includes at least one Bragg grating member for selecting the particular reception wavelength .lambda..sub.j. An optical waveguide optically communicates with each of the M receiving systems for transmitting a plurality of optical signals.Type: GrantFiled: March 29, 1996Date of Patent: March 10, 1998Assignee: Ciena Corp.Inventors: Stephen B. Alexander, Steve W. Chaddick, David R. Huber, Cecil D. Smith
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Patent number: 5715076Abstract: The present invention provides a remodulating channel selector for a wavelength division multiplexed optical communication system. The remodulating selector receives a WDM input signal, selects a particular optical channel from the WDM signal and places the information from the selected signal onto a newly-generated optical output signal. The wavelength of the output optical signal can be the same as or different from one of the optical channels which comprises the WDM input signal. When used in a WDM optical communication system with remodulators at the transmission input, the remodulating selectors provide complete control over the interfaces with optical transmitters and receivers, permitting use with a broad range of optical equipment.Type: GrantFiled: June 24, 1996Date of Patent: February 3, 1998Assignee: Ciena CorporationInventors: Stephen B. Alexander, Steve W. Chaddick, Roy Litz, Cecil D. Smith
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Patent number: 5504609Abstract: The present invention provides an optical communication system capable of placing incoming information-bearing optical signals onto plural optical signal channels for transmission over an optical waveguide. The optical system includes plural optical transmission elements, each transmission element emitting an information-bearing optical signal at a first transmission wavelength. Plural optical receiving systems are provided, each receiving system configured to receive an information-bearing optical signal at a particular reception wavelength. Each receiving system includes an optical filtering member comprising at least one Bragg grating member for selecting the particular reception wavelength. An optical waveguide optically communicates with each of the receiving systems for transmitting a plurality of optical signals. A plurality of optical amplifiers are positioned along the optical waveguide for amplifying plural optical signals simultaneously.Type: GrantFiled: May 11, 1995Date of Patent: April 2, 1996Assignee: Ciena CorporationInventors: Stephen B. Alexander, Steve W. Chaddick, David R. Huber, Cecil D. Smith
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Patent number: 4475676Abstract: This device is a clip having a mouth on opposite sides, one for clipping to a supporting object, and the other for a plurality of golf ball markers being clipped therein, and one of the clip sides including bent-up tongues, behind which golf ball tees are clipped.Type: GrantFiled: April 27, 1983Date of Patent: October 9, 1984Inventor: Cecil D. Smith