Patents by Inventor Shinkyo Kaku
Shinkyo Kaku 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: 7860678Abstract: A method for automated calibration of an avalanche photodiode receiver includes measuring two values of avalanche photodiode biases at two successive times, measuring and comparing a bit error rate corresponding to each value. When the bit error rate of the second value is equal to or greater than the bit error rate of the first value, then a third value and a fourth value of avalanche photodiode bias closer together are measured. When the bit error rate of the fourth value is smaller than the bit error rate of the third value, two subsequent values as third value and fourth value are measured, and an optimum avalanche photodiode bias when the bit error rate of the fourth value is equal to the bit error rate of the third value is measured.Type: GrantFiled: January 8, 2008Date of Patent: December 28, 2010Assignee: Allied Telesis, Inc.Inventors: Shinkyo Kaku, Vitali Tikhonov, Severino Tolentino
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Patent number: 7826740Abstract: A system and method for an Avalanche photo-diode (“APD”) optical receiver and laser system to adjust its performance during system operation without disturbing network traffic. Very small changes may be adaptively applied to some key portions of the system by controlling a set of main system parameters including Q-factor; Bit Error Rate (BER); histograms of “1” and “0” levels; input optical power; and laser output power. This adaptive routine may be performed during operation of the system to keep the main system parameters close to their optimum value. During adjustment, the system may be divided into separate portions. The adjustment of each portion may be independent of the other portions of the system. For the optical network system, optimization and priority of different portions may be assigned based on network channel architecture.Type: GrantFiled: April 19, 2007Date of Patent: November 2, 2010Assignee: Allied Telesis Inc.Inventors: Nikolai Fediakine, Shinkyo Kaku, Vitali Tikhonov
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Patent number: 7495203Abstract: Disclosed are an in-line monitoring apparatus, an optical receiver and a method for monitoring an input power of an optical signal in which one or more power monitoring stages, for example can measure the input power over an extended input power range. In one embodiment, an apparatus includes an avalanche photodiode (“APD”) configured to receive the optical signal and an input configured to bias the APD. It also includes one or more power monitoring stages coupled to the input in parallel with the APD for generating one or more measurement signals in-situ. In one embodiment, a range selector selects which one of the one or more power monitoring stages is to provide a measurement signal indicative of the input optical power. The power monitoring stages can provide for a wide range of linear current measurements as well as a range of measurable currents to monitor low-powered optical signals.Type: GrantFiled: September 9, 2005Date of Patent: February 24, 2009Assignee: Allied Telesyn, Inc.Inventors: Shinkyo Kaku, Vitali Tikhonov
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Patent number: 7439481Abstract: Disclosed are an in-line monitoring apparatus with a temperature compensator, an optical receiver and a method for stabilizing gain of an avalanche photodiode (“APD”) over an extended range of input power values and across temperature variations. The apparatus can include one or more power monitoring stages coupled in parallel to the APD for generating one or more measurement signals in-situ. The apparatus also includes a temperature compensator configured to adjust an operational parameter for the APD as a function of temperature and the measurement signal. The temperature compensator adjusts the bias to maintain a substantially uniform gain across temperature variations to facilitate an increased sensitivity with which to monitor the input power at lower levels than if the temperature compensator did not adjust the bias in response to the temperature. One of the power monitoring stages can be configured to monitor the low-powered optical signals.Type: GrantFiled: September 9, 2005Date of Patent: October 21, 2008Assignee: Allied Telesyn, Inc.Inventors: Shinkyo Kaku, Vitali Tikhonov
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Publication number: 20080222493Abstract: A method and system for optimizing a response time of a monitoring loop with forward error correction. Characteristics of a fiber optic communications channel are adjusted based on the number of errors corrected in the FEC decoder. An adaptive BER is calculated much faster by using a signal from an FEC decoder, than by comparing input and output transmission. Thereby, the lag time in adjusting the transmission characteristics of the fiber optic channel is minimized and the overall performance of the system is improved.Type: ApplicationFiled: May 22, 2008Publication date: September 11, 2008Applicant: ALLIED TELESIS, INC.Inventors: Nikolai Fediakine, Shinkyo Kaku, Vitali Tikhonov
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Publication number: 20080215280Abstract: A method for automated calibration of an avalanche photodiode receiver includes measuring two values of avalanche photodiode biases at two successive times, measuring and comparing a bit error rate corresponding to each value. When the bit error rate of the second value is equal to or greater than the bit error rate of the first value, then a third value and a fourth value of avalanche photodiode bias closer together are measured. When the bit error rate of the fourth value is smaller than the bit error rate of the third value, two subsequent values as third value and fourth value are measured, and an optimum avalanche photodiode bias when the bit error rate of the fourth value is equal to the bit error rate of the third value is measured.Type: ApplicationFiled: January 8, 2008Publication date: September 4, 2008Inventors: Shinkyo Kaku, Vitali Tikhonov, Severino Tolentino
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Patent number: 7415210Abstract: The optical signal multiplexer/demultiplexer of the invention is characterized by incorporating a bidirectional optical transceiver which is capable of using individual channels working in a transmitting and receiving modes simultaneously. The device consists of a number of optical prisms combined into a single module and provided with appropriate dichroic mirrors and interferrometric filters located on the outer surfaces of the prisms. According to one embodiment of the invention, the module consists of two sequentially arranged parallelogram prisms, a single-channel signal input/output unit with an optical collimator/focusator on one side of the prism module and a two-channel signal output/input unit with a respective optical collimator/focusator on the other side of the prism module.Type: GrantFiled: July 28, 2003Date of Patent: August 19, 2008Assignee: Allied Telesis, Inc.Inventors: Igor Gurevich, Victor Faibishenko, Nikolai Fedyakin, Shinkyo Kaku, Leonid Velikov
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Publication number: 20070248357Abstract: A system and method for an Avalanche photo-diode (“APD”) optical receiver and laser system to adjust its performance during system operation without disturbing network traffic. Very small changes may be adaptively applied to some key portions of the system by controlling a set of main system parameters including Q-factor; Bit Error Rate (BER); histograms of “1” and “0” levels; input optical power; and laser output power. This adaptive routine may be performed during operation of the system to keep the main system parameters close to their optimum value. During adjustment, the system may be divided into separate portions. The adjustment of each portion may be independent of the other portions of the system. For the optical network system, optimization and priority of different portions may be assigned based on network channel architecture.Type: ApplicationFiled: April 19, 2007Publication date: October 25, 2007Inventors: Nikolai Fediakine, Shinkyo Kaku, Vitali Tikhonov
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Publication number: 20070116460Abstract: A system and method for an Avalanche photo-diode (“APD”) optical receiver and laser system to adjust its performance during system operation without disturbing network traffic. Very small changes may be adaptively applied to some key portions of the system by controlling a set of main system parameters including Q-factor; Bit Error Rate (BER); histograms of “1” and “0” levels; input optical power; and laser output power. This adaptive routine may be performed during operation of the system to keep the main system parameters close to their optimum value. During adjustment, the system may be divided into separate portions. The adjustment of each portion may be independent of the other portions of the system. For the optical network system, optimization and priority of different portions may be assigned based on network channel architecture.Type: ApplicationFiled: September 18, 2006Publication date: May 24, 2007Inventors: Nikolai Fediakine, Shinkyo Kaku, Vitali Tikhonov
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Publication number: 20070116132Abstract: A method and system for optimizing a response time of a monitoring loop with forward error correction. Characteristics of a fiber optic communications channel are adjusted based on the number of errors corrected in the FEC decoder. An adaptive BER is calculated much faster by using a signal from an FEC decoder, than by comparing input and output transmission. Thereby, the lag time in adjusting the transmission characteristics of the fiber optic channel is minimized and the overall performance of the system is improved.Type: ApplicationFiled: September 18, 2006Publication date: May 24, 2007Inventors: Nikolai Fediakine, Shinkyo Kaku, Vitali Tikhonov
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Publication number: 20070057160Abstract: Disclosed are an in-line monitoring apparatus with a temperature compensator, an optical receiver and a method for stabilizing gain of an avalanche photodiode (“APD”) over an extended range of input power values and across temperature variations. The apparatus can include one or more power monitoring stages coupled in parallel to the APD for generating one or more measurement signals in-situ. The apparatus also includes a temperature compensator configured to adjust an operational parameter for the APD as a function of temperature and the measurement signal. The temperature compensator adjusts the bias to maintain a substantially uniform gain across temperature variations to facilitate an increased sensitivity with which to monitor the input power at lower levels than if the temperature compensator did not adjust the bias in response to the temperature. One of the power monitoring stages can be configured to monitor the low-powered optical signals.Type: ApplicationFiled: September 9, 2005Publication date: March 15, 2007Inventors: Shinkyo Kaku, Vitali Tikhonov
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Publication number: 20070058989Abstract: Disclosed are an in-line monitoring apparatus, an optical receiver and a method for monitoring an input power of an optical signal in which one or more power monitoring stages, for example can measure the input power over an extended input power range. In one embodiment, an apparatus includes an avalanche photodiode (“APD”) configured to receive the optical signal and an input configured to bias the APD. It also includes one or more power monitoring stages coupled to the input in parallel with the APD for generating one or more measurement signals in-situ. In one embodiment, a range selector selects which one of the one or more power monitoring stages is to provide a measurement signal indicative of the input optical power. The power monitoring stages can provide for a wide range of linear current measurements as well as a range of measurable currents to monitor low-powered optical signals.Type: ApplicationFiled: September 9, 2005Publication date: March 15, 2007Inventors: Shinkyo Kaku, Vitali Tikhonov
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Patent number: 6939058Abstract: The optical module of the invention for high-speed bidirectional transceiver consists of a signal receiving unit, a signal transmitting unit, a common receiving-transmitting optical fiber, and a fiber coupling unit. The laser diode and the photodiode are arranged parallel to each other in closely located recesses of the module housing. Such an arrangement makes it possible to shorten distances for guiding lead wires from the terminals of the PC board to the respective terminals of the transmitting and receiving diodes. The laser diode emits a first transmitting laser beam that passes through a microobjective that collimates the beam and directs into onto a full-reflection mirror located inside the module housing. The full-reflection mirror reflects the first transmitting beam at an angle of 90° and transmits it to the end face of an optical fiber through an optical fiber collimator that centers the beam with the fiber core.Type: GrantFiled: February 12, 2002Date of Patent: September 6, 2005Assignees: MicroAlign Technologies, Inc., Allied Telesyn International Corp.Inventors: Igor Gurevich, Victor Faibishenko, Nikolai Fedyakin, Shinkyo Kaku, Leonid Velikov
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Publication number: 20050025483Abstract: The optical signal multiplexer/demultiplexer of the invention is characterized by incorporating a bidirectional optical transceiver which is capable of using individual channels working in a transmitting and receiving modes simultaneously. The device consists of a number of optical prisms combined into a single module and provided with appropriate dichroic mirrors and interferrometric filters located on the outer surfaces of the prisms. According to one embodiment of the invention, the module consists of two sequentially arranged parallelogram prisms, a single-channel signal input/output unit with an optical collimator/focusator on one side of the prism module and a two-channel signal output/input unit with a respective optical collimator/focusator on the other side of the prism module.Type: ApplicationFiled: July 28, 2003Publication date: February 3, 2005Inventors: Igor Gurevich, Victor Faibishenko, Nikolai Fedyakin, Shinkyo Kaku, Leonid Velikov
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Publication number: 20030152336Abstract: The optical module of the invention for high-speed bidirectional transceiver consists of a signal receiving unit, a signal transmitting unit, a common receiving-transmitting optical fiber, and a fiber coupling unit. The laser diode and the photodiode are arranged parallel to each other in closely located recesses of the module housing. Such an arrangement makes it possible to shorten distances for guiding lead wires from the terminals of the PC board to the respective terminals of the transmitting and receiving diodes. The laser diode emits a first transmitting laser beam that passes through a microobjective that collimates the beam and directs into onto a full-reflection mirror located inside the module housing. The full-reflection mirror reflects the first transmitting beam at an angle of 90° and transmits it to the end face of an optical fiber through an optical fiber collimator that centers the beam with the fiber core.Type: ApplicationFiled: February 12, 2002Publication date: August 14, 2003Inventors: Igor Gurevich, Victor Faibishenko, Nikolai Fedyakin, Shinkyo Kaku, Leonid Velikov
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Patent number: 6279097Abstract: A method of generating a lookup table includes receiving an input address; generating a compressed address from the input address, the compressed address having fewer bits than the input address; selecting a first set of bits from the compressed address; determining whether a memory location pointed to by the first set of bits in an address lookup table includes an unoccupied memory slot; determining whether the input address matches any address stored in the memory location pointed to by the first set of bits in the address lookup table; and selecting a second set of bits from the compressed address in response to there not being an unoccupied memory slot in the memory location pointed to by the first set of bits and the input address not matching any address stored in the memory location pointed to by the first set of bits. A lookup table generator includes an address compressor, a barrel shifter, and an address lookup table that includes a memory location that is pointed to by the first set of bits.Type: GrantFiled: November 20, 1998Date of Patent: August 21, 2001Assignee: Allied Telesyn International CorporationInventor: Shinkyo Kaku
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Patent number: 5124982Abstract: An apparatus for coupling signals between a CSMA/CD data transmission medium and a plurality of data terminals. Collisions between data signals transmitted from more than one of the data terminals are detected to generate an internal collision signal. An external collision signal is generated in response to detected collision signals on the transmission medium. The internal and external collision signals are merged and broadcast through an isolating transformer to each of the data terminals.Type: GrantFiled: February 27, 1990Date of Patent: June 23, 1992Assignee: Allied Telesis, IncorporatedInventor: Shinkyo Kaku
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Patent number: 5063526Abstract: An apparatus for rotating bit-mapped data includes a specially designed data array (9) that includes a normal port (10) for accessing horizontal words of data and a rotated port (15) for accessing vertical words of data. In addition, address generating logic (6) is provided that automatically generates proper address seqences for accessing the normal words or the vertical words as appropriate during a rotation operation. The apparatus is cascadable (FIG. 29) to provide effectively any size data array.Type: GrantFiled: June 3, 1987Date of Patent: November 5, 1991Assignee: Advanced Micro Devices, Inc.Inventors: Koichi Kagawa, Chung-Li Yu, Shinkyo Kaku, Vinod Menon
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Patent number: 4992956Abstract: A device controls in real time the assembly of data for a bit map scanning device, such as a laser printer, under supervisory control of a host processor. The image data words are stored in a source memory and assembled in a video buffer, and automatically scanned out to the scanning device. The host processor generates a simplified set of control words that defines graphics, text and layout of the page to be assembled. A raster interface synchronizes the output of the assembled data with the scanning device. Three basic modes are supported: (1) dispatch mode, (2) font read/write mode, and (3) graphics load mode. The dispatch mode is the normal operational mode which provides for dispatching data from a source memory location to the video memory and for supplying data from the video memory out to the raster printer. The font read/write mode gives the host the ability to read/write font or graphics data from/to the source memory or the video memory.Type: GrantFiled: October 8, 1987Date of Patent: February 12, 1991Assignee: Advanced Micro Devices, Inc.Inventors: Shinkyo Kaku, Chung-Li Yu, Greg W. Barr, Steven Gary, David R. Staab, George W. Li, Anan Nagarajan, Shabbir M. Latif
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Patent number: 4839738Abstract: A decoder receives a series of input words defining variable length facsimile codes and generates pixel data to form a facsimile of an image. A code windowing apparatus selects a variable length code from the received series of words. A decoding ROM generates intermediate codes and code window control signals in response to the selected variable length codes. A reference windowing apparatus connected to receive pixel data generated during the decode of a previous scan line of the facsimile, selects a reference window of pixel data from a previous scan line. A color change detector indentifies a position of a color change picture element in the reference window. Output pixel data is generated in response to the intermediate codes and the position of the color change picture element in the reference window.Type: GrantFiled: April 22, 1987Date of Patent: June 13, 1989Assignee: Advanced Micro Devices, Inc.Inventors: Shinkyo Kaku, Chung-Li Yu