Patents by Inventor Ting-Kuang Chiang

Ting-Kuang Chiang 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).

  • Patent number: 7873133
    Abstract: The present invention provides a system, apparatus and method for recovering a client signal clock. The present invention is able to more effectively remove jitter within a clock signal by providing a phase shifting element in the feedback of a PLL system to compensate for sudden changes in an input reference clock. The PLL system provides flexible clock recovery so that it can accommodate various payload types because it extracts a client clock signal independent of a corresponding justification count number.
    Type: Grant
    Filed: June 26, 2006
    Date of Patent: January 18, 2011
    Assignee: Infinera Corporation
    Inventors: Scott A. Young, Ting-Kuang Chiang
  • Publication number: 20110008039
    Abstract: A forward error correction (FEC) communication device that includes a transmitter photonic integrated circuit (TxPIC) or a receiver photonic integrated circuit (RxPIC) and a FEC device for FEC coding at least one channel with a first error rate and at least one additional channel with a second error rate, wherein the first error rate is greater than the second error rate. The TxPIC chip is a monolithic multi-channel chip having an array of modulated sources integrated on the chip, each operating at a different wavelength, wherein at least one of the modulated sources is modulated with a respective FEC encoded signal. The TxPIC also includes an integrated wavelength selective combiner for combining the channels for transport over an optical link.
    Type: Application
    Filed: June 7, 2010
    Publication date: January 13, 2011
    Inventors: David F. Welch, Drew D. Perkins, Fred A. Kish, JR., Ting-Kuang Chiang
  • Publication number: 20110004700
    Abstract: A method includes receiving client data; extracting overhead data from the client data; mapping the client data into one or more frames, where each of the one or more frames has a frame payload section and a frame overhead section, where the client data is mapped into the frame payload section of the one or more frames; inserting the overhead data into the frame overhead section of the one or more frames; transporting the one or more frames across a network; extracting the overhead data from the frame overhead section of the one or more frames; recovering the client data from the one or more frames; inserting the extracted overhead data into the recovered client data to create modified client data; and outputting the modified client data.
    Type: Application
    Filed: July 1, 2009
    Publication date: January 6, 2011
    Inventors: Edward E. Sprague, Radhakrishna Valiveti, Jan Bialkowski, Ting-Kuang Chiang, Biao Lu, Rajan Rao, Parthiban Kandappan
  • Publication number: 20110004802
    Abstract: Consistent with the present disclosure, circuitry may be provided in an optical receiver that can determine a bit error rate (BER) associated with an incoming signal by dividing the number of errored bits in a frame alignment signals (FAS) by the number of bits in the FAS. Accordingly, although an optical signal may be severely degraded and forward error correction (FEC) cannot be performed, a BER may be obtained if the FAS can be identified. The BER can then be used in a feedback loop to control various optical or electrical components in the receiver to improve or reduce the BER to a level, for example, at which FEC can be performed.
    Type: Application
    Filed: July 1, 2009
    Publication date: January 6, 2011
    Inventors: JAN BIALKOWSKI, Satish K. Sridharan, Ting-Kuang Chiang
  • Patent number: 7848369
    Abstract: A modulator drive circuit provides a modulator drive signal to modulate an optical signal for transport across a network infrastructure. The modulator drive circuit powered by an adjustable voltage source, such that the modulator drive signal is generated from a data signal and the adjustable voltage source, an AC component of the modulator drive signal being derived from the data signal while a DC component of the modulator drive signal being derived from the adjustable voltage source. An array of such modulator drive circuits are provided on a single substrate.
    Type: Grant
    Filed: December 23, 2008
    Date of Patent: December 7, 2010
    Assignee: Infinera Corporation
    Inventors: Jeffrey S. Bostak, Ting-Kuang Chiang, Michael Kauffman
  • Publication number: 20100254705
    Abstract: Consistent with the present disclosure, an optical switch is provided that switches multiple wavelength division multiplexed (WDM) optical signals. Each of the WDM signals includes optical signals having the same wavelengths. The WDM signals are supplied to optical splitters, which supply power split portions of the WDM signals to corresponding optical gates. Groups of the optical gates are associated with a corresponding switching block, which may include a cyclical arrayed waveguide grating (AWG), and the optical gates within each group are controlled so that one gate passes a received WDM signal portion while the remaining optical gates in the group are in a blocking configuration. As a result, the WDM portion received by the non-blocking gate is demultiplexed in the switching block and each of the wavelength components that constitute the selected WDM portion are supplied to corresponding outputs within the switching block.
    Type: Application
    Filed: April 3, 2009
    Publication date: October 7, 2010
    Inventors: Drew D. Perkins, Ting-Kuang Chiang, Curtis Villamizar
  • Patent number: 7769051
    Abstract: An optical transmission network is inherently asynchronous due to the utilization of a variable overhead ratio (V-OHR). The network architecture makes extensive use of OEO regeneration, i.e., deals with any electronic reconditioning to correct for transmission impairments, such as, for example, FEC encoding, decoding and re-encoding, signal reshaping, retiming as well as signal regeneration. The optical transmission network includes a plesiochronous clocking system with intermediate nodes designed to operate asynchronously with a single local frequency clock without complicated network synchronization schemes employing high cost clocking devices such as phase locked loop (PLL) control with crystal oscillators and other expensive system components.
    Type: Grant
    Filed: October 22, 2007
    Date of Patent: August 3, 2010
    Assignee: Infinera Corporation
    Inventors: Drew D. Perkins, Ting-Kuang Chiang, Edward E. Sprague, Daniel P. Murphy
  • Patent number: 7751713
    Abstract: Embodiments of the present invention route a WDM signal across multiple communication paths using skew characteristics of at least some of the communication paths. The network is an optical transport network, using either circuit or packet based switching, and wavelength division multiplexed wavelengths and/or optical carrier groups (“OCGs”) over a fiber link to another node in the network. The plurality of communication paths involves different signal and path attributes such as a plurality of carrier wavelengths, optical carrier groups, physical communication paths (different nodes, different fibers along a same path, or any combination of the foregoing), or any other differentiating factors between two paths.
    Type: Grant
    Filed: July 23, 2007
    Date of Patent: July 6, 2010
    Assignee: Infinera Corporation
    Inventors: Drew D. Perkins, David F. Welch, Ting-Kuang Chiang, Charles H. Joyner, Edward E. Sprague, Parthiban Kandappan, Stephen G. Grubb, Biao Lu, Prasad Paranjape
  • Patent number: 7734191
    Abstract: A forward error correction (FEC) communication device that includes a transmitter photonic integrated circuit (TxPIC) or a receiver photonic integrated circuit (RxPIC) and a FEC device for FEC coding at least one channel with a first error rate and at least one additional channel with a second error rate, wherein the first error rate is greater than the second error rate. The TxPIC chip is a monolithic multi-channel chip having an array of modulated sources integrated on the chip, each operating at a different wavelength, wherein at least one of the modulated sources is modulated with a respective FEC encoded signal. The TxPIC also includes an integrated wavelength selective combiner for combining the channels for transport over an optical link.
    Type: Grant
    Filed: December 11, 2006
    Date of Patent: June 8, 2010
    Assignee: Infinera Corporation
    Inventors: David F. Welch, Drew D. Perkins, Fred A. Kish, Jr., Ting-Kuang Chiang
  • Patent number: 7716560
    Abstract: The present invention provides a system, apparatus and method for accurately identifying optical or digital impairments on a span using FEC errors identified at an intermediary node. This information may be provided to an end node within a network to switch to a redundant path around the impaired optical path or span therein. In one embodiment of the invention, signal degradation is identified by analyzing FEC data within a FEC decoded signal at an intermediary node. An identification of signal degradation provides an indication of a potential failing span within an optical link, which may be provided in-band or out-of-band to a terminal node so that a signal may be switched around a failing path, or span therein, prior to an actual failure event.
    Type: Grant
    Filed: June 30, 2006
    Date of Patent: May 11, 2010
    Assignee: Infinera Corporation
    Inventors: Edward E. Sprague, Marco E. Sosa, Daniel P. Murphy, Christopher C. Liou, Ting-Kuang Chiang, Drew D. Perkins
  • Patent number: 7684399
    Abstract: An optical transmission network is inherently asynchronous due to the utilization of a variable overhead ratio (V-OHR). The network architecture makes extensive use of OEO regeneration, i.e., deals with any electronic reconditioning to correct for transmission impairments, such as, for example, FEC encoding, decoding and re-encoding, signal reshaping, retiming as well as signal regeneration. The optical transmission network includes a plesiochronous clocking system with intermediate nodes designed to operate asynchronously with a single local frequency clock without complicated network synchronization schemes employing high cost clocking devices such as phase locked loop (PLL) control with crystal oscillators and other expensive system components.
    Type: Grant
    Filed: October 22, 2007
    Date of Patent: March 23, 2010
    Assignee: Infinera Corporation
    Inventors: Drew D. Perkins, Ting-Kuang Chiang, Edward E. Sprague, Daniel P. Murphy
  • Publication number: 20100014861
    Abstract: A network may include an ingress node that is configured to receive a client signal having a client rate that is one of a multiple different client rates, asynchronously map the client signal into a first frame of a first rate, asynchronously map the first frame into a second frame of a second rate, and output the second frame on the network; an intermediate node that is configured to receive the second frame, recover the first frame from the second frame, asynchronously map the first frame into a third frame of a third rate, and output the third frame on the network, where the intermediate node does not recover the client signal from the first frame; and an egress node that is configured to receive the third frame, recover the first frame from the third frame, recover the client signal from the first frame, and output the client signal.
    Type: Application
    Filed: February 6, 2009
    Publication date: January 21, 2010
    Applicant: INFINERA CORPORATION
    Inventors: Ting-Kuang CHIANG, Edward E. Sprague
  • Publication number: 20090324220
    Abstract: Embodiments of the present invention route a wavelength division multiplexed signal across multiple communication paths using skew characteristics of at least some of the communication paths. The network is a wavelength division multiplexed optical transport network. The plurality of communication paths involves different signal and path attributes such as a plurality of carrier wavelengths, optical carrier groups, physical communication paths (different nodes, different fibers along a same path, or any combination of the foregoing), or any other differentiating factors between two paths.
    Type: Application
    Filed: June 30, 2008
    Publication date: December 31, 2009
    Inventors: Drew D. Perkins, David F. Welch, Ting-Kuang Chiang, Charles H. Joyner, Edward E. Sprague, Parthiban Kandappan, Stephen Grubb, Prasad Paranjape
  • Publication number: 20090245793
    Abstract: Embodiments of the present invention provide a systems, devices, and methods in which a client signal is divided into a plurality of channels, mapped within transport frames, and combined into a WDM transport signal. These embodiments include intra-nodal redundancy that protects against failure events within the transport transmitter. In particular, redundancy is provided within a network transport transmitter such that redundant paths are available so that electrical channels may be routed around a malfunctioning component within the transmitter.
    Type: Application
    Filed: March 31, 2008
    Publication date: October 1, 2009
    Inventor: Ting-Kuang Chiang
  • Patent number: 7574146
    Abstract: An optical transmission network includes an optical transmitter photonic integrated circuit (TxPIC) chip, utilized in an optical transmitter and has a plurality of monolithic modulated sources integrated for multiple signal channels on the same semiconductor chip is provided with channel equalization at the optical receiver side of the network that permits one or more such integrated modulated sources in the TxPIC chip to be out of specification thereby increasing the chip yield and reducing manufacturing costs in the deployment of such TxPIC chips. FEC error counts at the FEC decoder on the optical receiver side of the network includes counters that accumulate a plurality of bit pattern-dependent error counts based on different N-bit patterns in the received data bit stream. The accumulated counts of different N-bit patterns are utilized to provide for corrections to threshold and phase relative to the bit eye pattern as well as provided for weight coefficients for the optical receiver equalization system.
    Type: Grant
    Filed: July 9, 2004
    Date of Patent: August 11, 2009
    Assignee: Infinera Corporation
    Inventors: Ting-Kuang Chiang, Vincent G. Dominic, Robert B. Taylor
  • Publication number: 20090161247
    Abstract: Embodiments of the present invention analyze a plurality of parallel channels and identify specific channel(s) that have skew outside of an acceptable skew error margin. In certain embodiments, this skew is identified by determining the timing misalignment between a channel under test and a deskew channel. Other channels within the plurality of channels are masked by transmitting a repeating masked bit pattern. This timing misalignment may be measured by comparing a segment within the channel under test to a corresponding segment within the deskew channel and identifying a time differential between the two segments.
    Type: Application
    Filed: December 20, 2007
    Publication date: June 25, 2009
    Inventors: Ting-Kuang Chiang, Prasad Paranjape, Michael D. Jarchi, Mallikarjun Chillal
  • Patent number: 7551815
    Abstract: A method is disclosed for monitoring and controlling the bit error rate (BER) in an optical communication network where an optical receiver in the optical transmission network. The method includes the steps of decombining a combined channel signal received from the network and then monitoring a real time bit error rate (BER) of a decombined channel signal. The determined BER is then communicated, such as through an optical service channel (OSC) to an optical transmitter source that is the source of origin of the channel signal. Based upon the determined BER, the chirp of a channel signal modulator at the optical transmitter source that generated the monitored channel signal is adjusted by, for example, adjusting its bias. The same channel signal received at the optical receiver can be monitored again to determine if an acceptable level for the BER has been achieved by the previous chirp adjustment.
    Type: Grant
    Filed: August 9, 2006
    Date of Patent: June 23, 2009
    Assignee: Infinera Corporation
    Inventors: David F. Welch, Ting-Kuang Chiang, Vincent G. Dominic, Fred A. Kish, Jr., Radhakrishnan L. Nagarajan
  • Patent number: 7546001
    Abstract: Monolithic photonic integrated circuits (PICs) utilize forward error correction (FEC) joint encoder or plural encoders or a joint decoder or plural decoders.
    Type: Grant
    Filed: April 14, 2007
    Date of Patent: June 9, 2009
    Assignee: Infinera Corporation
    Inventors: David F. Welch, Radhakrishnan L. Nagarajan, Fred A. Kish, Jr., Vincent G. Dominic, Ting-Kuang Chiang
  • Patent number: 7519246
    Abstract: A photonic integrated circuit (PIC) chip comprising an array of modulated sources, each providing a modulated signal output at a channel wavelength different from the channel wavelength of other modulated sources and a wavelength selective combiner having an input optically coupled to received all the signal outputs from the modulated sources and provide a combined output signal on an output waveguide from the chip. The modulated sources, combiner and output waveguide are all integrated on the same chip.
    Type: Grant
    Filed: October 9, 2007
    Date of Patent: April 14, 2009
    Assignee: Infinera Corporation
    Inventors: David F. Welch, Vincent G. Dominic, Fred A. Kish, Jr., Mark J. Missey, Radhakrishnan L. Nagarajan, Atul Mathur, Frank H. Peters, Robert B. Taylor, Matthew L. Mitchell, Alan C. Nilsson, Stephen G. Grubb, Richard P. Schneider, Charles H. Joyner, Jonas Webjorn, Ting-Kuang Chiang, Robert Grencavich, Vinh D. Nguyen, Donald J. Pavinski, Jr., Marco E. Sosa
  • Publication number: 20090052892
    Abstract: Embodiments of the present invention route a wavelength division multiplexed signal across multiple communication paths using skew characteristics of at least some of the communication paths. The network is a wavelength division multiplexed optical transport network. The plurality of communication paths involves different signal and path attributes such as a plurality of carrier wavelengths, optical carrier groups, physical communication paths (different nodes, different fibers along a same path, or any combination of the foregoing), or any other differentiating factors between two paths.
    Type: Application
    Filed: September 6, 2007
    Publication date: February 26, 2009
    Inventors: Drew D. Perkins, David F. Welch, Ting-Kuang Chiang, Edward E. Spragua, Parthiban Kandappan, Stephen G. Grubb, Prasad Paranjape