Patents by Inventor Aravanan Gurusami
Aravanan Gurusami 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: 20240079839Abstract: A temperature controller is used for a gain fiber of a fiber amplifier. The controller includes a heat transfer structure and one or more temperature sinks, such as cooling plates. The heat transfer structure supports the gain fiber and is disposed in thermal contact with it. Portions of the temperature sink(s) are disposed in different thermal conductivity with sections of the heat transfer structure. For example, the sinks may have different material properties and/or material thicknesses. Also, portions of the temperature sink(s) can have different cooling rates. The different thermal conductivities conduct the heat from parts of the gain fiber differently from one another. In the end, an onset of Stimulated Brillouin Scattering (SBS) on the laser light path can be mitigated by conducting heat from the gain fiber with the different thermal conductivities.Type: ApplicationFiled: September 1, 2022Publication date: March 7, 2024Inventors: Eric T. Green, Aravanan Gurusami, Joseph Mangano, Martin Seifert
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Patent number: 11843219Abstract: A fiber-based master optical power amplifier (MOPA) is configured to utilize a pump source that operates in pulse mode with the arrival time of the pump pulses coordinated with the arrival time of the input pulses. The width of the pump pulses is also controlled, thus providing a mechanism for controlling both the amount of pump energy injected into the fiber amplifier, as well as the overlap in time between the pump pulse and the seed pulse. As the pulse repetition interval (PRI) of the input seed pulse changes, the timing of the pump pulses and their width are also changed so that a “constant gain” environment is created within the amplifying medium, providing an essentially constant energy output pulse, regardless of differences in ASE generated during different PRIs.Type: GrantFiled: July 23, 2020Date of Patent: December 12, 2023Inventors: Martin R. Williams, Timothy K. Zahnley, Thomas W. McNamara, Aravanan Gurusami, Scott Dahl, Siegfried Fleischer
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Patent number: 11777597Abstract: Modules for optical time-domain reflectometry (OTDR) are connected via at least one fiber link of a fiber optic communication network. The modules can perform OTDR operations on the at least one fiber link. In addition, the modules can establish an inter-node communication channel between each other on the at least one fiber link. The channel allows the OTDR modules to synchronize their OTDR operations and to exchange information, such as OTDR traces, between each other.Type: GrantFiled: June 14, 2022Date of Patent: October 3, 2023Assignee: II-VI DELAWARE, INC.Inventors: Michael J. L. Cahill, Aravanan Gurusami, Timothy K. Zahnley
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Patent number: 11747579Abstract: The present disclosure generally relates to devices, which may be used in communication or optoelectronic modules for example, suitable for arrayed positioning of a plurality of fiber optical components. In one form, an optoelectronic module includes a printed circuit board (PCB) and at least one optical component array device including an array of laterally or radially spaced receptacles configured to receive an optical component. One or more of the receptacles includes a fused fiber optical component positioned therein. A recursive fiber may extend between an output of a first fused fiber optical component and an input of a second fused fiber optical component, and an optical fiber routing member may be coupled to the PCB and include a plurality of guides extending away from the PCB and defining a pathway for routing optical fibers relative to the PCB.Type: GrantFiled: June 23, 2020Date of Patent: September 5, 2023Assignee: II-VI DELAWARE, INC.Inventors: Eric T. Green, Bradley Dailey, Aravanan Gurusami
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Publication number: 20230187895Abstract: A system for communicating supervisory information between amplifier nodes in an optical communication network utilizes modulation of an included pump source to superimpose the supervisory information on data signals (typically customer data signals) propagating between the amplifier nodes transmitted customer signals. The modulated pump appears as a modulated envelope on the amplified data signal exiting the amplifier node, and may be recovered by suitable demodulation components located at the second node (i.e., the destined receiver of the supervisory information). The supervisory information may include monitoring messages, provisioning data, protocol updates, etc., and is utilized as an input to an included modulator, which then forms a drive signal for the pump controller.Type: ApplicationFiled: February 2, 2023Publication date: June 15, 2023Applicant: II-VI Delaware, Inc.Inventors: Aravanan Gurusami, Deepak Devicharan, Timothy K. Zahnley, Martin R. Williams
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Patent number: 11588295Abstract: A system and method for communicating supervisory information between amplifier nodes in an optical communication network utilizes modulation of an included pump source to superimpose the supervisory information on through-transmitted customer signals (or ASE associated with the amplifier if no customer traffic is present). The supervisory information (which may include monitoring messages, provisioning data, protocol updates, and the like) is utilized as an input to an included modulator, which then forms a drive signal for the pump controller. In a preferred embodiment, binary FSK modulation is used.Type: GrantFiled: November 1, 2019Date of Patent: February 21, 2023Assignee: II-VI Delaware, Inc.Inventors: Aravanan Gurusami, Deepak Devicharan, Timothy K. Zahnley, Martin R. Williams
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Publication number: 20220321212Abstract: Modules for optical time-domain reflectometry (OTDR) are connected via at least one fiber link of a fiber optic communication network. The modules can perform OTDR operations on the at least one fiber link. In addition, the modules can establish an inter-node communication channel between each other on the at least one fiber link. The channel allows the OTDR modules to synchronize their OTDR operations and to exchange information, such as OTDR traces, between each other.Type: ApplicationFiled: June 14, 2022Publication date: October 6, 2022Inventors: Michael J. L. Cahill, Aravanan Gurusami, Timothy K. Zahnley
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Patent number: 11405102Abstract: Modules for optical time-domain reflectometry (OTDR) are connected via at least one fiber link of a fiber optic communication network. The modules can perform OTDR operations on the at least one fiber link. In addition, the modules can establish an inter-node communication channel between each other on the at least one fiber link. The channel allows the OTDR modules to synchronize their OTDR operations and to exchange information, such as OTDR traces, between each other.Type: GrantFiled: April 1, 2021Date of Patent: August 2, 2022Assignee: II-VI DELAWARE, INC.Inventors: Michael J. L. Cahill, Aravanan Gurusami, Timothy K. Zahnley
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Publication number: 20220085889Abstract: A pluggable bidirectional optical amplifier module may include preamp and booster optical amplifiers and a housing. The preamp optical amplifier may be configured to amplify optical signals traveling in a first direction. The booster optical amplifier may be configured to amplify optical signals traveling in a second direction. The housing may at least partially enclose the preamp optical amplifier and the booster optical amplifier. The pluggable bidirectional optical amplifier module may have a mechanical form factor that is compliant with a pluggable communication module form factor MSA. A colorless mux/demux cable assembly may be operated with the pluggable bidirectional optical amplifier. The colorless mux/demux cable assembly may include a 1:N optical splitter a N:1 optical combiner coupled side-by-side to the 1:N optical splitter, a first fiber optic cable optic cable, and a second fiber optic cable.Type: ApplicationFiled: September 23, 2021Publication date: March 17, 2022Inventors: Martin R. Williams, Yajun Wang, Eric Timothy Green, Aravanan Gurusami, Deepak Devicharan, Timothy Kent Zahnley, Mike Burgess
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Publication number: 20210396942Abstract: The present disclosure generally relates to devices, which may be used in communication or optoelectronic modules for example, suitable for arrayed positioning of a plurality of fiber optical components. In one form, an optoelectronic module includes a printed circuit board (PCB) and at least one optical component array device including an array of laterally or radially spaced receptacles configured to receive an optical component. One or more of the receptacles includes a fused fiber optical component positioned therein. A recursive fiber may extend between an output of a first fused fiber optical component and an input of a second fused fiber optical component, and an optical fiber routing member may be coupled to the PCB and include a plurality of guides extending away from the PCB and defining a pathway for routing optical fibers relative to the PCB.Type: ApplicationFiled: June 23, 2020Publication date: December 23, 2021Inventors: Eric T. Green, Bradley Dailey, Aravanan Gurusami
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Patent number: 11177886Abstract: A pluggable bidirectional optical amplifier module may include preamp and booster optical amplifiers and a housing. The preamp optical amplifier may be configured to amplify optical signals traveling in a first direction. The booster optical amplifier may be configured to amplify optical signals traveling in a second direction. The housing may at least partially enclose the preamp optical amplifier and the booster optical amplifier. The pluggable bidirectional optical amplifier module may have a mechanical form factor that is compliant with a pluggable communication module form factor MSA. A colorless mux/demux cable assembly may be operated with the pluggable bidirectional optical amplifier. The colorless mux/demux cable assembly may include a 1:N optical splitter a N:1 optical combiner coupled side-by-side to the 1:N optical splitter, a first fiber optic cable optic cable, and a second fiber optic cable.Type: GrantFiled: March 6, 2020Date of Patent: November 16, 2021Assignee: II-VI DELAWARE, INC.Inventors: Martin Williams, Yajun Wang, Eric Green, Aravanan Gurusami, Deepak Devicharan, Timothy Zahnley, Mike Burgess
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Publication number: 20210281323Abstract: A pluggable bidirectional optical amplifier module may include preamp and booster optical amplifiers and a housing. The preamp optical amplifier may be configured to amplify optical signals traveling in a first direction. The booster optical amplifier may be configured to amplify optical signals traveling in a second direction. The housing may at least partially enclose the preamp optical amplifier and the booster optical amplifier. The pluggable bidirectional optical amplifier module may have a mechanical form factor that is compliant with a pluggable communication module form factor MSA. A colorless mux/demux cable assembly may be operated with the pluggable bidirectional optical amplifier. The colorless mux/demux cable assembly may include a 1:N optical splitter a N:1 optical combiner coupled side-by-side to the 1:N optical splitter, a first fiber optic cable optic cable, and a second fiber optic cable.Type: ApplicationFiled: March 6, 2020Publication date: September 9, 2021Inventors: Martin R. Williams, Yajun Wang, Eric Timothy Green, Aravanan Gurusami, Deepak Devicharan, Timothy Kent Zahnley, Mike Burgess
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Publication number: 20210135425Abstract: A system and method for communicating supervisory information between amplifier nodes in an optical communication network utilizes modulation of an included pump source to superimpose the supervisory information on through-transmitted customer signals (or ASE associated with the amplifier if no customer traffic is present). The supervisory information (which may include monitoring messages, provisioning data, protocol updates, and the like) is utilized as an input to an included modulator, which then forms a drive signal for the pump controller. In a preferred embodiment, binary FSK modulation is used.Type: ApplicationFiled: November 1, 2019Publication date: May 6, 2021Applicant: II-VI Delaware, Inc.Inventors: Aravanan Gurusami, Deepak Devicharan, Timothy K. Zahnley, Martin R. Williams
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Publication number: 20200358246Abstract: A fiber-based master optical power amplifier (MOPA) is configured to utilize a pump source that operates in pulse mode with the arrival time of the pump pulses coordinated with the arrival time of the input pulses. The width of the pump pulses is also controlled, thus providing a mechanism for controlling both the amount of pump energy injected into the fiber amplifier, as well as the overlap in time between the pump pulse and the seed pulse. As the pulse repetition interval (PRI) of the input seed pulse changes, the timing of the pump pulses and their width are also changed so that a “constant gain” environment is created within the amplifying medium, providing an essentially constant energy output pulse, regardless of differences in ASE generated during different PRIs.Type: ApplicationFiled: July 23, 2020Publication date: November 12, 2020Applicant: II-VI Delaware, Inc.Inventors: Martin R. Williams, Timothy K. Zahnley, Thomas W. McNamara, Aravanan Gurusami, Scott Dahl, Siegfried Fleischer
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Publication number: 20200251877Abstract: A fiber-based master optical power amplifier (MOPA) is configured to utilize a pump source that operates in pulse mode with the arrival time of the pump pulses coordinated with the arrival time of the input pulses. The width of the pump pulses is also controlled, thus providing a mechanism for controlling both the amount of pump energy injected into the fiber amplifier, as well as the overlap in time between the pump pulse and the seed pulse. As the pulse repetition interval (PRI) of the input seed pulse changes, the timing of the pump pulses and their width are also changed so that a “constant gain” environment is created within the amplifying medium, providing an essentially constant energy output pulse, regardless of differences in ASE generated during different PRIs.Type: ApplicationFiled: February 5, 2019Publication date: August 6, 2020Applicant: II-VI Delaware, Inc.Inventors: Martin R. Williams, Timothy K. Zahnley, Thomas W. McNamara, Aravanan Gurusami, Scott Dahl, Siegfried Fleischer
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Patent number: 10727643Abstract: A fiber-based master optical power amplifier (MOPA) is configured to utilize a pump source that operates in pulse mode with the arrival time of the pump pulses coordinated with the arrival time of the input pulses. The width of the pump pulses is also controlled, thus providing a mechanism for controlling both the amount of pump energy injected into the fiber amplifier, as well as the overlap in time between the pump pulse and the seed pulse. As the pulse repetition interval (PRI) of the input seed pulse changes, the timing of the pump pulses and their width are also changed so that a “constant gain” environment is created within the amplifying medium, providing an essentially constant energy output pulse, regardless of differences in ASE generated during different PRIs.Type: GrantFiled: February 5, 2019Date of Patent: July 28, 2020Assignee: II-VI Delaware, Inc.Inventors: Martin R. Williams, Timothy K. Zahnley, Thomas W. McNamara, Aravanan Gurusami, Scott Dahl, Siegfried Fleischer
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Patent number: 10564068Abstract: An OTDR system utilizes a laser source that is turned “on” and kept powered until its light reaches the end of the fiber span being measured (i.e., until the fiber span is fully illuminated). At any point in time after the fiber is fully illuminated, the laser source can be turned “off”. The return (reflected and backscattered) signal is directed into a photodetector of the OTDR, and is measured from the point in time when the fiber span starts to be illuminated. The measurements are made by sampling the return signal at predetermined time intervals—defined as the sampling rate. The created power samples are then subjected to post-processing in the form of a differentiation operation to create a conventional OTDR trace from the collected data.Type: GrantFiled: July 5, 2017Date of Patent: February 18, 2020Assignee: II-VI Delaware, Inc.Inventors: Aravanan Gurusami, Timothy Zahnley, Scott Dahl, Deepak Devicharan, Ian Peter McClean
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Patent number: 9806486Abstract: An optical amplifier module is configured as a multi-stage free-space optics arrangement, including at least an input stage and an output stage. The actual amplification is provided by a separate fiber-based component coupled to the module. A propagating optical input signal and pump light are provided to the input stage, with the amplified optical signal exiting the output stage. The necessary operations performed on the signal within each stage are provided by directing free-space beams through discrete optical components. The utilization of discrete optical components and free-space beams significantly reduces the number of fiber splices and other types of coupling connections required in prior art amplifier modules, allowing for an automated process to create a “pluggable” optical amplifier module of small form factor proportions.Type: GrantFiled: March 17, 2016Date of Patent: October 31, 2017Assignee: II-VI IncorporatedInventors: Mark H. Garrett, Aravanan Gurusami, Ian Peter McClean, Nadhum Zayer, Eric Timothy Green, Mark Filipowicz, Massimo Martinelli
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Publication number: 20170307472Abstract: An OTDR system utilizes a laser source that is turned “on” and kept powered until its light reaches the end of the fiber span being measured (i.e., until the fiber span is fully illuminated). At any point in time after the fiber is fully illuminated, the laser source can be turned “off”. The return (reflected and backscattered) signal is directed into a photodetector of the OTDR, and is measured from the point in time when the fiber span starts to be illuminated. The measurements are made by sampling the return signal at predetermined time intervals—defined as the sampling rate. The created power samples are then subjected to post-processing in the form of a differentiation operation to create a conventional OTDR trace from the collected data.Type: ApplicationFiled: July 5, 2017Publication date: October 26, 2017Applicant: II-VI IncorporatedInventors: Aravanan Gurusami, Timothy Zahnley, Scott Dahl, Deepak Devicharan, Ian Peter McClean
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Patent number: 9752955Abstract: An OTDR system utilizes a laser source that is turned “on” and kept powered until its light reaches the end of the fiber span being measured (i.e., until the fiber span is fully illuminated). At any point in time after the fiber is fully illuminated, the laser source can be turned “off”. The return (reflected and backscattered) signal is directed into a photodetector of the OTDR, and is measured from the point in time when the fiber span starts to be illuminated. The measurements are made by sampling the return signal at predetermined time intervals—defined as the sampling rate. The created power samples are then subjected to post-processing in the form of a differentiation operation to create a conventional OTDR trace from the collected data.Type: GrantFiled: June 30, 2015Date of Patent: September 5, 2017Assignee: II-VI INCORPORATEDInventors: Aravanan Gurusami, Timothy Zahnley, Scott Dahl, Deepak Devicharan, Ian Peter McClean