Patents by Inventor Tan Thai
Tan Thai 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: 6856767Abstract: The present invention provides an optical signal quality selection system for optimizing the quality of information transmission. The system splits an incoming optical signal into two equal signals. The split signals are evaluated in optical performance monitors, transmitting an electrical output message to a signal selector relating to the quality of the respective signal. A second electrical message is sent from the optical performance generator to an alarm indicator signal generator, which sends an optical signal to the signal selector to drop the one of the split signals and transmit the non-dropped split signal. An unequipped optical signal from an optical idle signal generator is triggered if no active optical signal is being transmitted.Type: GrantFiled: April 18, 2001Date of Patent: February 15, 2005Assignee: Alphion CorporationInventors: Mohammad Laham, Raj Acharya, Roman Antosik, Jayantha Das, Bharat Dave, Chinnabbu Ekambaram, Khem Gandhi, Frank Hujber, David Lowe, Frederick Renner, Jiten Sarathy, Ronald Simprini, Boris Stefanov, Tan Thai, Ravi Vora
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Patent number: 6727991Abstract: A method and circuit are presented for an all-optical format independent preprocessor that processes an arbitrary optical input signal by converting a NRZ signal to a PRZ signal, or if the input optical signal is RZ, by merely amplifying it. The method involves subtracting a delayed copy of the signal from the original, thereby effectively doubling its frequency, and inserting a pulse at each transition of the original signal, whether rising or falling. In a preferred embodiment this stage is implemented via an integrated SOA in each arm of an asymmetric interferometric device. The asymmetry consists of a delay element in one arm. In a preferred embodiment the entire device is fabricated on a semiconductor substrate, allowing for compactness as well as minimization of interconnectivity losses and overall power consumption. The output of the preprocessor, having a significant frequency component at its original clock rate, can then be fed to a clock recovery stage for all-optical clock recovery.Type: GrantFiled: July 15, 2002Date of Patent: April 27, 2004Assignee: Alphion CorporationInventors: Julio Martinez, Kwang Kim, Olga Nedzhvetskaya, Doruk Engin, Jiten Sarathy, Roman Antosik, Bharat Dave, Michael Evans, David Lidsky, Ronald Simprini, Boris Stefanov, Tan Thai
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Patent number: 6724484Abstract: A method and circuit are presented for an all-optical format independent preprocessor that processes an arbitrary optical input signal by converting a NRZ signal to a PRZ signal, or if the input optical signal is RZ, by merely amplifying it. The method involves subtracting a delayed copy of the signal from the original, thereby effectively doubling its frequency, and inserting a pulse at each transition of the original signal, whether rising or falling. In a preferred embodiment this stage is implemented via an integrated SOA in each arm of an asymmetric interferometric device. The asymmetry consists of a delay element in one arm. In a preferred embodiment the entire device is fabricated on a semiconductor substrate, allowing for compactness as well as minimization of interconnectivity losses and overall power consumption. The output of the preprocessor, having a significant frequency component at its original clock rate, can then be fed to a clock recovery stage for all-optical clock recovery.Type: GrantFiled: July 15, 2002Date of Patent: April 20, 2004Assignee: Alphion CorporationInventors: Julio Martinez, Kwang Kim, Olga Nedzhvetskaya, Doruk Engin, Jiten Sarathy, Roman Antosik, Bharat Dave, Michael Evans, David Lidsky, Ronald Simprini, Boris Stefanov, Tan Thai
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Patent number: 6646794Abstract: A method and circuit are presented for an all-optical format independent preprocessor that processes an arbitrary optical input signal by converting a NRZ signal to a PRZ signal, or if the input optical signal is RZ, by merely amplifying it. The method involves subtracting a delayed copy of the signal from the original, thereby effectively doubling its frequency, and inserting a pulse at each transition of the original signal, whether rising or falling. In a preferred embodiment this stage is implemented via an integrated SOA in each arm of an asymmetric interferometric device. The asymmetry consists of a delay element in one arm. In a preferred embodiment the entire device is fabricated on a semiconductor substrate, allowing for compactness as well as minimization of interconnectivity losses and overall power consumption. The output of the preprocessor, having a significant frequency component at its original clock rate, can then be fed to a clock recovery stage for all-optical clock recovery.Type: GrantFiled: July 15, 2002Date of Patent: November 11, 2003Assignee: Alphion CorporationInventors: Julio Martinez, Kwang Kim, Olga Nedzhvetskaya, Doruk Engin, Jiten Sarathy, Bharat Dave, Ronald Simprini, Boris Stefanov, Tan Thai
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Patent number: 6570697Abstract: A method and circuit are presented for an all-optical format independent preprocessor that processes an arbitrary optical input signal by converting a NRZ signal to a PRZ signal, or if the input optical signal is RZ, by merely amplifying it. The method involves subtracting a delayed copy of the signal from the original, thereby effectively doubling its frequency, and inserting a pulse at each transition of the original signal, whether rising or falling. In a preferred embodiment this stage is implemented via an integrated SOA in each arm of an asymmetric interferometric device. The asymmetry consists of a delay element in one arm. In a preferred embodiment the entire device is fabricated on a semiconductor substrate, allowing for compactness as well as minimization of interconnectivity losses and overall power consumption. The output of the preprocessor, having a significant frequency component at its original clock rate, can then be fed to a clock recovery stage for all-optical clock recovery.Type: GrantFiled: May 4, 2001Date of Patent: May 27, 2003Assignee: Alphion CorporationInventors: Julio Martinez, Kwang Kim, Olga Nedzhvetskaya, Doruk Engin, Jiten Sarathy, Roman Antosik, Bharat Dave, Michael Evans, David Lidsky, Ronald Simprini, Boris Stefanov, Tan Thai
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Publication number: 20030067648Abstract: A method and apparatus are presented for implementing maintenance signaling in an optical data network, said method comprising the use of a finite set of optical symbols to distinguish between different classes of failures. The method is format and bit rate transparent, and a network element does not need to read bits to interpret a signaling message. Faults protected within the network are distinguished from faults originating outside the network, and power glitches are filtered out of incoming alarm signals originating outside the network.Type: ApplicationFiled: April 8, 2002Publication date: April 10, 2003Inventors: Roman Antosik, Jayanta Das, Bharat Dave, Kuo-Ming Lee, David Lowe, Kwang Kim, Jithamithra Sarathy, Ronald Simprini, Boris Stefanov, Tan Thai, Wai-Ching Yu
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Publication number: 20020181087Abstract: A method and circuit are presented for an all-optical format independent preprocessor that processes an arbitrary optical input signal by converting a NRZ signal to a PRZ signal, or if the input optical signal is RZ, by merely amplifying it. The method involves subtracting a delayed copy of the signal from the original, thereby effectively doubling its frequency, and inserting a pulse at each transition of the original signal, whether rising or falling. In a preferred embodiment this stage is implemented via an integrated SOA in each arm of an asymmetric interferometric device. The asymmetry consists of a delay element in one arm. In a preferred embodiment the entire device is fabricated on a semiconductor substrate, allowing for compactness as well as minimization of interconnectivity losses and overall power consumption. The output of the preprocessor, having a significant frequency component at its original clock rate, can then be fed to a clock recovery stage for all-optical clock recovery.Type: ApplicationFiled: July 15, 2002Publication date: December 5, 2002Inventors: Julio Martinez, Kwang Kim, Olga Nedzhvetskaya, Doruk Engin, Jiten Sarathy, Roman Antosik, Bharat Dave, Michael Evans, David Lidsky, Ronald Simprini, Boris Stefanov, Tan Thai
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Publication number: 20020181084Abstract: A method and circuit are presented for an all-optical format independent preprocessor that processes an arbitrary optical input signal by converting a NRZ signal to a PRZ signal, or if the input optical signal is RZ, by merely amplifying it. The method involves subtracting a delayed copy of the signal from the original, thereby effectively doubling its frequency, and inserting a pulse at each transition of the original signal, whether rising or falling. In a preferred embodiment this stage is implemented via an integrated SOA in each arm of an asymmetric interferometric device. The asymmetry consists of a delay element in one arm. In a preferred embodiment the entire device is fabricated on a semiconductor substrate, allowing for compactness as well as minimization of interconnectivity losses and overall power consumption. The output of the preprocessor, having a significant frequency component at its original clock rate, can then be fed to a clock recovery stage for all-optical clock recovery.Type: ApplicationFiled: July 15, 2002Publication date: December 5, 2002Inventors: Julio Martinez, Kwang Kim, Olga Nedzhvetskaya, Doruk Engin, Jiten Sarathy, Roman Antosik, Bharat Dave, Michael Evans, David Lidsky, Ronald Simprini, Boris Stefanov, Tan Thai
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Publication number: 20020181085Abstract: A method and circuit are presented for an all-optical format independent preprocessor that processes an arbitrary optical input signal by converting a NRZ signal to a PRZ signal, or if the input optical signal is RZ, by merely amplifying it. The method involves subtracting a delayed copy of the signal from the original, thereby effectively doubling its frequency, and inserting a pulse at each transition of the original signal, whether rising or falling. In a preferred embodiment this stage is implemented via an integrated SOA in each arm of an asymmetric interferometric device. The asymmetry consists of a delay element in one arm. In a preferred embodiment the entire device is fabricated on a semiconductor substrate, allowing for compactness as well as minimization of interconnectivity losses and overall power consumption. The output of the preprocessor, having a significant frequency component at its original clock rate, can then be fed to a clock recovery stage for all-optical clock recovery.Type: ApplicationFiled: July 15, 2002Publication date: December 5, 2002Inventors: Julio Martinez, Kwang Kim, Olga Nedzhvetskaya, Doruk Engin, Jiten Sarathy, Roman Antosik, Bharat Dave, Michael Evans, David Lidsky, Ronald Simprini, Boris Stefanov, Tan Thai
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Publication number: 20020048060Abstract: The present invention provides an optical signal quality selection system for optimizing the quality of information transmission. The system splits an incoming optical signal into two equal signals. The split signals are evaluated in optical performance monitors, transmitting an electrical output message to a signal selector relating to the quality of the respective signal. A second electrical message is sent from the optical performance generator to an alarm indicator signal generator, which sends an optical signal to the signal selector to drop the one of the split signals and transmit the non-dropped split signal. An unequipped optical signal from an optical idle signal generator is triggered if no active optical signal is being transmitted.Type: ApplicationFiled: April 18, 2001Publication date: April 25, 2002Inventors: Mohammad A. Laham, Raj Acharya, Roman Antosik, Jayantha Das, Bharat Dave, Chinnabbu Ekambaram, Khem Gandhi, Frank Hujber, David Lowe, Frederick Renner, Jiten Sarathy, Ronald Simprini, Boris Stefanov, Tan Thai, Ravi Vora
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Publication number: 20020041428Abstract: A method and circuit are presented for an all-optical format independent preprocessor that processes an arbitrary optical input signal by converting a NRZ signal to a PRZ signal, or if the input optical signal is RZ, by merely amplifying it. The method involves subtracting a delayed copy of the signal from the original, thereby effectively doubling its frequency, and inserting a pulse at each transition of the original signal, whether rising or falling. In a preferred embodiment this stage is implemented via an integrated SOA in each arm of an asymmetric interferometric device. The asymmetry consists of a delay element in one arm. In a preferred embodiment the entire device is fabricated on a semiconductor substrate, allowing for compactness as well as minimization of interconnectivity losses and overall power consumption. The output of the preprocessor, having a significant frequency component at its original clock rate, can then be fed to a clock recovery stage for all-optical clock recovery.Type: ApplicationFiled: May 4, 2001Publication date: April 11, 2002Inventors: Julio Martinez, Kwang Kim, Olga Nedzhvetskaya, Doruk Engin, Jiten Sarathy, Roman Antosik, Bharat Dave, Michael Evans, David Lidsky, Ronald Simprini, Boris Stefanov, Tan Thai