Patents Issued in February 14, 2008
-
Publication number: 20080037559Abstract: The present invention relates to a control system and communications systems that make it possible to transport traffic in a connection-oriented mode using the network infrastructure (30) and hardware of a traditionally connectionless network (34). According to the invention a traditionally connectionless network is complemented with a connection-oriented control plane (37). A subset (38b) of the address space (38) that in a connectionless network is used to define destination addresses is reserved for connection-oriented transport and is used to define path labels. An advantage of the invention is that an inexpensive Ethernet infrastructure (30) can be used for implementing a connection-oriented network (35).Type: ApplicationFiled: October 18, 2007Publication date: February 14, 2008Applicant: Telefonaktiebolaget LM EricssonInventor: Anders ERIKSSON
-
Publication number: 20080037560Abstract: The present invention proposes a routing method performed by a mobile terminal in wireless communication systems, comprising: (i) receiving route probing signals to the destination mobile terminal from another mobile terminal; (ii) calculating the route cost to the destination mobile terminal via said mobile terminal according to said route probing signals and system performance parameters; (iii) sending response messages to said another mobile terminal according to the calculated route cost.Type: ApplicationFiled: September 8, 2004Publication date: February 14, 2008Applicant: Koninklijke Philips Electronics N.V.Inventors: Bruce Jia, Sun Li, Pan Sheng
-
Publication number: 20080037561Abstract: A method for Layer 2 packet transmission is disclosed, wherein a corresponding relationship between packet attribute information and public MAC addresses is configured in an access device such that the access device could find a corresponding public MAC address in the corresponding relationship when receiving a packet from a user terminal, then replaces the source MAC address with the public MAC address found, and then sends the packet to a convergence layer device. A method for transmission of a Layer 2 packet without character information is also disclosed. The access device needs to obtain the packet attribute information and carry the information in the packet to be sent to the convergence layer device. An access device is also disclosed. As a result, the capacity of the VLAN and the MAC address table items needed for the convergence layer device to convert MAC addresses is greatly decreased.Type: ApplicationFiled: May 17, 2006Publication date: February 14, 2008Applicant: Huawei Technologies Co., LtdInventor: Haijun Wu
-
Publication number: 20080037562Abstract: A method and apparatus for centralized control of a network is described. The network includes a number of nodes. The method includes creating a database and storing the database on a master node of the network. The database contains topology information regarding a topology of the network. Each of the nodes is coupled to at least one other of the nodes, with the master node being one of the nodes.Type: ApplicationFiled: October 23, 2007Publication date: February 14, 2008Inventors: Ali Saleh, H. Zadikian, Zareh Baghdasarian, Vahid Parsi
-
Publication number: 20080037563Abstract: A method and corresponding apparatus is provided for automatically configuring a Network Interface Device (NID). The NID enables automatic detection of communications on multiple service ports. When the NID detects communications, it configures at least one of the multiple service ports and informs the supervisory unit of the service port(s) on which communications are detected. The NID may configure at least one of the multiple service ports by disabling the multiple service ports except the service port(s) on which communications are detected. The NID may subsequently detect inactivity and re-enable automatic detection of communications. The NID may activate a timer that times when to inform the supervisory unit, to configure service ports, or to re-enable automatic detection of communications. Embodiments of the invention reduce the time and effort required to install a NID, e.g., an ONT, especially when an installer does not initially know the best service port(s) to use.Type: ApplicationFiled: August 10, 2006Publication date: February 14, 2008Inventor: Marc R. Bernard
-
Publication number: 20080037564Abstract: An access node connected to a local exchange is provided, the access node including a V5 interface, a first timer and a first detection module. The V5 interface starts a V5 connection between the access node and the local exchange. The first timer times according to a first timing period if the V5 connection is started, and comprises a first timing-detection sub-module. The first detection module detects whether the access node receives variant and interface ID information within the first timing period. The first timing-detection sub-module detects whether the first timer times out if the access node does not receive the variant and interface ID information. A method for starting V5 connection is also disclosed.Type: ApplicationFiled: April 18, 2007Publication date: February 14, 2008Applicant: HON HAI PRECISION INDUSTRY CO., LTD.Inventor: CHU-FENG LIEN
-
Publication number: 20080037565Abstract: Apparatus, methods, and machine-readable articles of manufacture improve reliability and scalability of a messaging system. In some embodiments, the system's configuration data and subscriber information are stored in a central repository of a core node, and replicated to one or more non-core nodes. Data replication may be performed in real-time or near real-time, periodically, sporadically, or otherwise. Nodes may rely on the replicated data to provide the system's subscribers and outside callers with services that do not involve updating of configuration or subscriber data. In this way, the non-core nodes may continue to process calls when the core node is unavailable. For example, the non-core nodes can route calls to the appropriate subscribers without relying on the core. As another example, die non-core nodes can take messages from callers when the core node is unavailable. The messages may be queued for posting and delivery when the core node becomes available.Type: ApplicationFiled: May 10, 2007Publication date: February 14, 2008Inventors: Douglas G. Murray, Steven J. Tindall, Roger E. Visser
-
Publication number: 20080037566Abstract: An interworking control mechanism for a communication connection between at least two parties located in different networks provides the following functions: a parameter may be added in a signalling towards one party, which interprets the parameter and shows/indicates a message to the user that a media composition change is not possible and thus prevented even if it would be instructed; otherwise, an announcement is sent from the network to the other party being incapable to execute the media composition change to inform the user about the dropping of a media stream; and a negotiation between the network and the terminal device of the party being incapable to execute the media composition change is initiated in order to modify the remaining session streams, such as to rearrange the available bandwidth and possibly to change a codec to a better one.Type: ApplicationFiled: May 17, 2007Publication date: February 14, 2008Inventor: Juha Rasanen
-
Publication number: 20080037567Abstract: A method and apparatus for ensuring QoS in a synchronous Ethernet bridge are disclosed, in which a classifier classifies an ingress packet according to a PHB mapped to a DSCP value of the packet and provides the classified packet to one of a predetermined synchronous packet queue and a predetermined asynchronous packet queue, a buffer queue with a plurality of queues mapped to priority levels buffers the classified packet, a marker marks the buffered packet as a synchronous packet or, if the buffered packet is an asynchronous packet, marks the packet in a predetermined format corresponding to a priority level of the packet, and a synchronous Ethernet scheduler schedules the marked packet.Type: ApplicationFiled: August 9, 2007Publication date: February 14, 2008Inventors: Jae-Hun Cho, Seong-Taek Hwang, Hoon Kim, Yun-Je Oh
-
Publication number: 20080037568Abstract: A method for translating data packets from one network protocol to another is disclosed. A set of translation templates is constructed. The translation templates are then loaded into a translation template cache. In response to a data packet from a first network arriving at a translation router, an appropriate translation template is selected from the set of translation templates within the translation template cache according to the translation context of the data packet. Next, a new header for transmission into a second network is constructed by reading header fields of the data packet from the first network along with the appropriate translation template in the translation template cache. The data payload of the data packet from the first network is subsequently removed from the header of the data packet and then appended to the constructed header of the second network. Finally, the newly constructed data packet is transmitted to the second network.Type: ApplicationFiled: August 17, 2007Publication date: February 14, 2008Inventors: Richard Anderson, Marc Faucher, Christos Georgiou, Francis Noel
-
Publication number: 20080037569Abstract: A method and apparatus for communication in a wireless sensor network. In one embodiment, one or more routers in a network may be available for communication with one or more star nodes at a randomized time and/or frequency. A connectivity assessment, which may be performed at several different frequencies and/or times, may be performed to evaluate the quality of communications between devices in the network. Primary and secondary communication relationships may be formed between devices to provide for system redundancy. One or more proxies may be maintained where each proxy includes a status of one or more devices in the network, e.g., one or more star nodes or routers. Proxies may be used to handle information requests and/or status change requests, e.g., a proxy may be requested to change a communication relationship between devices in the network and may generate command signals to cause the corresponding devices to make the change.Type: ApplicationFiled: July 12, 2007Publication date: February 14, 2008Applicant: Sensicast SystemsInventors: Jay Werb, Victor Berry, Howard Weiss, C. Lamb
-
Publication number: 20080037570Abstract: A power saving method and apparatus are provided for saving power by reducing the number of changes between active mode and sleep mode using multiple channels. A process for negotiating which of multiple channels will be assigned a transmission opportunity (TXOP) is performed. A TXOP MAP is configured by exchanging a packet through a common channel during a predetermined time at every monitoring time according to a negotiated channel. The TXOP is allocated to each channel according to the TXOP MAP. As a change between the active mode and the sleep mode is reduced, power can be saved, resources of the mesh network can be efficiently used, and interference between nodes can be reduced.Type: ApplicationFiled: April 30, 2007Publication date: February 14, 2008Inventors: Jae-Hoon Kim, Young-Gon Choi
-
Publication number: 20080037571Abstract: Network devices of a digital network for communication between a plurality of devices have a source for transmitting data into the network, and sinks for receiving data from the network. Managers (logical controllers) to which priorities are assigned in a hierarchical order manage connections between sources and sinks. Before setting up a connection, a manager first queries a negotiation administrator to obtain a right to negotiate with other managers and to set up connections. When all other managers having higher priorities also have granted the connection, the manager connects sources and sinks.Type: ApplicationFiled: July 31, 2007Publication date: February 14, 2008Applicant: OASIS SILICONSYSTEMS HOLDING AGInventors: Herbert Hetzel, Rainer Klos, Martin Miller
-
Publication number: 20080037572Abstract: Provided are apparatuses and methods for determining a logical channel for transmission of a data packet in a network. A logical channel may provide a corresponding Quality of Service (QoS). Data traffic may be identified based on class of service (CoS) and each CoS may be handled through a default QoS configuration, for example. A logical channel may be associated with or preconfigured with a designated default QoS configuration such that transmission of data on the logical channel may be available without prior QoS negotiation or setup signaling. In one example, the selection of the logical channel may be based on a Differentiated Services Code Point (DSCP) marked in the data packet.Type: ApplicationFiled: January 3, 2007Publication date: February 14, 2008Applicant: NOKIA CORPORATIONInventors: Benoist Sebire, Tatikonda Sivakumar, Haitao Tang
-
Publication number: 20080037573Abstract: A method and apparatus for encoding and distributing media signals comprising a module for receiving and distributing media data through a communications network, wherein the module performs an encoding process in response to a control signal generated by a controller operating in collaboration with the module.Type: ApplicationFiled: July 17, 2007Publication date: February 14, 2008Applicant: VEODIA, INC.Inventor: Guillaume Cohen
-
Publication number: 20080037574Abstract: A method of securing an invited Push-To (PT) user's privacy in an automatic answer mode of a PT service is discussed. According to an embodiment of the present invention, a method for performing a PT (Push-To) service setting procedure, includes transmitting PT service setting information of a PT client to a PT server during a PT service setting procedure, the PT service setting information including answer mode setting information and privacy information, the answer mode setting information indicating if an answer mode of the PT client is an automatic answer mode or a manual answer mode, the privacy information indicating whether or not an identity of the PT client is to be kept private in the answer mode; and storing the PT service setting information of the PT client in the PT server, whereby the PT server can selectively inform identification information of the PT client to another PT client based on the privacy information.Type: ApplicationFiled: June 6, 2007Publication date: February 14, 2008Applicant: LG Electronics Inc.Inventors: Kang-Suk Huh, Sung Bum Choi
-
Publication number: 20080037575Abstract: A system and method are presented for changing physical layer (PHY) parameters in a PHY device of a communications system. New parameters are written to a first-in first-out queue in a serial interface, while the scheduled time for the changeover is written to a control register in the serial interface. When the time for the changeover occurs, the parameters are written to the PHY device via a port of the serial interface.Type: ApplicationFiled: October 3, 2007Publication date: February 14, 2008Applicant: Broadcom CorporationInventors: A. Hollums, Niki Pantelias, David Ferguson
-
Publication number: 20080037576Abstract: A multimedia communication system in an Internet Protocol (IP) network includes broadcast capabilities. A system-wide emergency broadcast initiated by a user with the appropriate authority interrupts all teleconferences in progress. A group-wide high priority broadcast initiated by a user with the appropriate authority may interrupt some teleconferences in progress in the selected or other group(s). A group-wide normal priority broadcast allows all teleconferences to remain in progress and user may choose to join or not join the broadcast when the in-progress teleconference has ended.Type: ApplicationFiled: June 28, 2005Publication date: February 14, 2008Inventors: Cherng-Daw Hwang, Steven Wang, Weiping Li
-
Publication number: 20080037577Abstract: In inter-vehicle communication, a communication apparatus may not normally receive a packet having a sufficient reception power level. Under such circumstances, a control circuit in the apparatus determines that the received packet has collided with other packet if a condition is met that a time period for a receiver circuit to receive a packet having a reception power level of equal to or more than a set value is longer than a time period required for the receiver circuit to receive a packet having a predetermined packet length.Type: ApplicationFiled: August 9, 2007Publication date: February 14, 2008Applicant: DENSO CorporationInventor: Michinaga Nagura
-
Publication number: 20080037578Abstract: A method for providing network access to a shared access communications medium for a plurality of users includes the steps of conducting predictive admission control by arbitrating user requests for access to the shared medium based on predicted aggregate demands, conducting lookahead scheduling for use in making user channel assignments by forecasting schedule transmission opportunities one or more channels of the shared medium, and balancing load by making channel assignments such that a plurality users are each assigned a respective channel of the shared medium based upon a predicted need. Congestion parameters can predicted for each channel of the shared medium and mapped to a congestion measure using a mathematical function that takes into account packet loss rate, packet delay, packet delay jitter, and available capacity.Type: ApplicationFiled: September 18, 2007Publication date: February 14, 2008Inventors: WILLIAM CARLSON, Matthew Moyer, Martin McKinnon, Freeman Rufus, John Hart
-
Publication number: 20080037579Abstract: The present invention discloses a network adapter which can allow an electric device which does not have a networking function to access various networks and perform a control operation. The network adapter includes a first interface for sending a sound/image signal to one electric device, a second interface for receiving a data from another electric device, a multimedia processing unit for converting the data into a sound/image signal, and a control processing unit for controlling the data received from another electric device to be converted into the sound/image signal and transmitted to one electric device, when the data is required to be converted into the sound/image signal.Type: ApplicationFiled: August 10, 2007Publication date: February 14, 2008Inventors: Dong-hun Lee, Sang-hyuk Kang, Jin-sung Park, Joon-hyung Park, Ji-hwon Kim
-
Publication number: 20080037580Abstract: In one embodiment, techniques for processing voice collisions are provided. A voice collision of two or more voice streams associated with two or more speakers is determined. The voice collision of the two or more voice streams is dynamically disambiguated. The two or more voice streams are then rendered such that the voice collision is disambiguated. The voice collision may be disambiguated using spatial relocation, buffering, etc.Type: ApplicationFiled: August 8, 2006Publication date: February 14, 2008Applicant: Cisco Technology, Inc.Inventors: Shmuel Shaffer, Steven Christenson
-
Publication number: 20080037581Abstract: The present invention provides a transmission apparatus including transmitting side line interfaces which convert packet format data sent from an asynchronous network to a SONET/SDH frame format and then transmit the data, multiple receiving side line interfaces which receive the SONET/SDH frame format data and convert the data to packet format data and a circuit switching section which performs circuit switching. The transmitting side line interfaces include a variable length frame mapping section which converts the packet format data to variable length frame format data and a time division multiplexing mapping section which converts the variable length frame format data to the SONET/SDH frame format data. The receiving side line interfaces include a variable length frame demapping section which reconverts the SONET/SDH frame format data to variable length frame format data.Type: ApplicationFiled: January 25, 2007Publication date: February 14, 2008Applicant: FUJITSU LIMITEDInventor: Hiroyuki Asano
-
Publication number: 20080037582Abstract: A message converting method is disclosed, including: recognizing a type of a received message, sending the message to a message parsing module matching the type of the message; acquiring recipient information and the content of the message carried in the message; selecting an destination communication manner supporting the content of the message, and acquiring new recipient information corresponding to the recipient information and the destination communication manner; encapsulating the sender information, the new recipient information and corresponding content of the message supported by the destination communication manner, and sending a new message generated through the encapsulation to an address designated by the new recipient information. A message converting device is also disclosed. A communication manner suitable for content of message may be selected for sending the message, thus bringing convenience to users, and lowering requirements on terminals.Type: ApplicationFiled: August 10, 2007Publication date: February 14, 2008Inventor: Rui Wang
-
Publication number: 20080037583Abstract: Disclosed herein are systems and methods for applying unified management policies to monitor, store, search and otherwise manage electronic communications, no matter what format those electronic communications take. Such unified management policy or policies are based on an integrated true identity of a user, typically a person. In one embodiment, a policy implementation module for managing electronic communications transmitted across a communications network in multiple communication formats is provided. The module comprises a message filtering process configured to uniformly filter electronic communications transmitted in the multiple communication formats and that are determined to be associated with a true identity of user employing the multiple communication formats.Type: ApplicationFiled: March 20, 2007Publication date: February 14, 2008Applicant: POSTINI, INC.Inventors: Adam S. Dawes, Scott M. Petry, Peter K. Lund, Donald R. Woods, Joseph J. Green, Roderick J. McChesney, Ninh C. Mai
-
Publication number: 20080037584Abstract: This invention presents a multimode xDSL line card adaptive activation method, comprising the following steps: A) A master controller is installed and configured with multiple templates based on the modes of operation supported by a line card, and forwards templates to said line card; B) The line card receives templates forwarded by the master controller and activates the line card communications chip; C) The communications chip communicates with the remote CPE and decides on a mode of operation according to a handshake protocol; D) The line card employs a corresponding template according to the mode of operation chosen in Step C, and practices circuit activation with the CPE. This invention solves the existing problems in current multimode xDSL technology of poor compatibility and inability to adapt effectively.Type: ApplicationFiled: December 14, 2006Publication date: February 14, 2008Applicant: Huawei Technologies Co., Ltd.Inventors: Yong Liang, Haihong Wei, Binfeng Wang, Xinjun Zhang
-
Publication number: 20080037585Abstract: An interface and related methods for rate pacing in an Ethernet architecture are described herein.Type: ApplicationFiled: October 22, 2007Publication date: February 14, 2008Inventors: Mark Feuerstraeter, Bradley Booth
-
Publication number: 20080037586Abstract: A communication interface and a method for establishing the communication interface for communications between a mobile station and a serving network node over a Gb interface in a GSM network are described herein. The communication interface comprises control logic, a network layer having a plurality of NSAPIs, and a link layer having a plurality of user-data SAPIs. The number of NSAPIs equals the number of user-data SAPIs. In one embodiment, the number of NSAPIs is limited to equal the number of user-data SAPIs. In another embodiment, the number of SPAIs is expanded to equal the number of NSAPIs. In both cases, the control logic performs one-to-one mapping between the NSAPIs and the user-data SAPIs.Type: ApplicationFiled: April 13, 2007Publication date: February 14, 2008Applicant: Telefonaktiebolaget LM Ericsson (publ)Inventors: Christian Herrero-Veron, Regina Johannesson
-
Device, system and method for analysis of fragments in a transmission control protocol (TCP) session
Publication number: 20080037587Abstract: A method performed in an intrusion detection/prevention system, a system or a device for analyzing segments in a transmission in a communication network. The transmission includes segments in the same transmission control protocol (TCP) session. Segments in a transmission are monitored. Data in the segments in the transmission are reassembled in an order indicated by a segment reassembly policy, the segment reassembly policy indicating an order specific to at least comprehensively overlapped segments.Type: ApplicationFiled: August 10, 2006Publication date: February 14, 2008Applicant: Sourcefire, Inc.Inventors: Martin Frederick Roesch, Judy Hollis Novak, Steven Sturges -
Publication number: 20080037588Abstract: Disclosed are a radio link control (RLC) entity and a data processing method for the RLC entity. The RLC entity includes a transmission data storing module that stores PDUs corresponding to SDUs transmitted from a first upper layer and outputs the stored PDUs by SDU units, a ciphering module that ciphers the PDUs stored in the transmission data storing module and transmitting the ciphered PDUs to a first RLC entity, a deciphering module that deciphers the ciphered PDUs transmitted from a second RLC entity, and a received data storing module that stores the deciphered PDUs and outputs the PDUs toward a second upper layer in the form of SDU units.Type: ApplicationFiled: November 14, 2006Publication date: February 14, 2008Inventor: Seung June Yi
-
Publication number: 20080037589Abstract: A home network, in one embodiment including a home wiring system; a demarcation point unit in electrical communication with the home wiring system; and a home network module in electrical communication with the home wiring system. The home network module is adapted for connection to a home electronic device. The demarcation point unit passes data to and receives data from the home electronic device through the home network module.Type: ApplicationFiled: October 16, 2007Publication date: February 14, 2008Inventors: Avi Kliger, Rami Kopelman, Nachum Avishay, Alon Shtern, Amir Wassermann
-
Publication number: 20080037590Abstract: A multiplexer includes: a first band-pass filter for a first channel, which is formed in a microstrip line on a dielectric substrate and has a first branching characteristic having a center frequency of f1 and an attenuation pole at a frequency of fa1; and a second band-pass filter for a second channel, which is formed in a microstrip line on a dielectric substrate and has a second branching characteristic having a center frequency of f2 and an attenuation pole at a frequency of fa2. The following relationships (1) to (5) are satisfied: (1) f1<f2; (2) f1<fa1; (3) fa2<f2; (4) f2?fa1<(f2?f1)/2; and (5) fa2?f1<(f2?f1)/2. The second branching characteristic exhibits ?20 dB or less at the frequency of fa1 and the first branching characteristic exhibits ?20 dB or less at the frequency of fa2.Type: ApplicationFiled: March 14, 2007Publication date: February 14, 2008Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Fumihiko Aiga, Hiroyuki Kayano, Tatsunori Hashimoto, Noritsugu Shiokawa
-
Publication number: 20080037591Abstract: A data recording and reproducing apparatus includes a separation unit configured to separate a program clock reference (PCR) from a received transport stream packet (TS packet), a counter to count system time clocks (STCs) generated corresponding to the clock frequency, a comparison unit configured to compare the PCR with the STC to output a difference between the PCR and the STC as a control signal, a first control unit configured to control the clock frequency on the basis of the control signal and to output information on a control parameter and a control timing for controlling the clock frequency, a second control unit configured to generate a system time clock packet (STC packet) containing the control parameter and the control timing as control information, and a recording unit configured to record the TS packet and the STC packet.Type: ApplicationFiled: December 22, 2006Publication date: February 14, 2008Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Hirofumi Mori, Tatsunori Saito
-
Publication number: 20080037592Abstract: A transmission device in which a bus of a central processing unit is used to synchronize timing signals between units, thereby restraining enlargement in scale of wiring. A reference signal generator generates a reference signal. A reference signal receiver is mounted on a unit set as an active or standby unit and receives the reference signal. A timing signal generator divides the frequency of the received reference signal by means of a frequency divider/counter to generate a timing signal. A count holder holds the count value of the frequency divider/counter. The bus connects the units and the central processing unit. A count receiver receives, via the bus, the count value from the count holder of the active unit. A count updater updates the count value of the frequency divider/counter to the count value received by the count receiver.Type: ApplicationFiled: July 19, 2007Publication date: February 14, 2008Applicant: FUJITSU LIMITEDInventors: Takashi Kaiga, Koichi Sugama, Tsutomu Chikazawa, Yukio Katayanagi, Kenichi Yajima, Hideo Abe, Ryuji Kayama, Masahiro Shioda
-
Publication number: 20080037593Abstract: Techniques are disclosed for synchronizing service data between a data store and a device using the service data. These synchronization techniques may be used with a synchronization method and device that adaptively adjust synchronization parameters, such as the synchronization interval and quantity of synchronized data, on a per-end-user basis in response to actual end-user behavior. In particular, heavy users of service data are rewarded with improved synchronization parameters, such as a combination of shorter synchronization intervals and increased synchronization data quantities, which provides closer to “direct access” performance.Type: ApplicationFiled: October 15, 2007Publication date: February 14, 2008Inventors: Gregory Friedman, Coyle MARL
-
Publication number: 20080037594Abstract: High-speed, high-performance, low-power transponders, serializers and deserializers are disclosed. A transponder may include a transmitter and a receiver. A serializer may include (i) a serdes framer interface (SFI) circuit for receiving data channels and a reference channel from a framer and realigning the data channels, (ii) a clock multiplier unit (CMU) for receiving a clock frequency and translating the clock frequency to a higher clock frequency, (iii) a multiplexing circuit for merging data channels into one data channel, (iv) an output driver stage, (v) a reference selection circuit for selecting a reference clock, filtering the reference clock, and providing to the CMU one of the selected reference clock or a filtered reference clock.Type: ApplicationFiled: August 30, 2007Publication date: February 14, 2008Applicant: SIERRA MONOLITHICS, INCInventors: Craig Hornbuckle, David Rowe, Thomas Krawczyk, Samuel Steidl, Inho Kim
-
Publication number: 20080037595Abstract: A system is disclosed for providing a first electromagnetic field and a second electromagnetic field to vibrational analysis equipment that is responsive to a difference between first and second frequencies of the first and second electromagnetic fields respectively. The system includes a non-linear crystal that may be pumped at a high repetition rate to provide a pulsed signal field at a signal field frequency and a pulsed idler field at an idler field frequency as output. The signal field provides the first electromagnetic field and the idler field provides the second electromagnetic field. The system also includes a tuning system for permitting the difference between the signal field frequency and the idler field frequency to be changed. The system also includes an output unit for providing the first and second electromagnetic fields to the vibrational analysis equipment.Type: ApplicationFiled: July 17, 2007Publication date: February 14, 2008Inventors: Feruz Gankkhanov, Silvia Carrasco, Xiaoliang Xie
-
Publication number: 20080037596Abstract: A laser beam irradiation apparatus includes a laser beam oscillation unit including a pulse laser beam oscillator for oscillating a pulse laser beam and a cycle frequency setting unit for setting the cycle frequency, an acousto-optic deflection unit for deflecting the optical axis of the pulse laser beam oscillated from the laser beam oscillation section, and a control unit for controlling the acousto-optic deflection unit. The control unit outputs a driving pulse signal having a predetermined time width including a pulse width of the pulse laser beam oscillated from the pulse laser beam oscillator to the acousto-optic deflection unit based on the cycle frequency setting signal from the cycle frequency setting section.Type: ApplicationFiled: August 8, 2007Publication date: February 14, 2008Inventors: Yutaka Kobayashi, Kouichi Nehashi, Keiji Nomaru, Yasuomi Kaneuchi
-
Publication number: 20080037597Abstract: In a first embodiment, the invention makes use of a Neodymium doped YAG (Nd: YAG) gain medium placed in an optical resonant cavity formed by two mirrors. Power extraction is maximized for a specific laser cavity. In particular the concave curvature on the rod ends contributes a negative lensing component to modify the strength of the thermal lens. In a second embodiment the present invention uses an amplifier rod medium with curved ends to act as lensing elements to collect emission from the laser gain medium and/or oscillator described in the first embodiment of the invention. The combination of thermal lens and curved rod ends produces a lensing effect which allows light to be directly coupled from a laser. In addition, variation of the input pump power allows for control of the thermal lens formed within the amplifier rod.Type: ApplicationFiled: February 23, 2005Publication date: February 14, 2008Inventors: Michael Mason, Duncan Parsons-Karavassilis, Nicolas Hay, Matthew Kelly, Andrew Comley, Burly Cumberland, Michael Poulter
-
Publication number: 20080037598Abstract: A device for generating a frequency converted laser beam includes a nonlinear crystal having a first end face and a second end face opposed to the first end face. The nonlinear crystal is configured to receive at least one input laser beam at the first end face and output a frequency converted beam at the second face. A beam waist of the at least one input laser beam is positioned between the first end face and the second end face during a frequency conversion process. The device also includes a second crystal having a first end face bonded to the second end face of the nonlinear crystal and a second end face opposed to the first end face. A beam diameter of the frequency converted beam at the first end face of the second crystal is less than a beam diameter of the frequency converted beam at the second end face of the second crystal.Type: ApplicationFiled: April 24, 2007Publication date: February 14, 2008Inventors: R.J. Miller, Shujie Lin, Kresimir Franjic
-
Publication number: 20080037599Abstract: In a wavelength conversion laser device, a laser light source emits first wavelength light. A non-linear optical crystal converts the first wavelength light into second wavelength light. A rotational driver rotates the non-linear optical crystal so as to alter an incidence angle of the first wavelength light with respect to the non-linear optical crystal. A rotational driving controller detects a portion of an output of the second wavelength light, generates a rotational control signal of the non-linear optical crystal in accordance with a change in the output, and transmits the rotational control signal to the rotational driver. A beam location maintaining mirror retroreflects the second wavelength light, outputted from the non-linear optical crystal, along a substantially same path as that of the first wavelength light. Also, an output beam distributor guides the retroreflected second wavelength light in a desired output direction.Type: ApplicationFiled: June 13, 2007Publication date: February 14, 2008Inventors: Byung Jin Ma, Kiyoyuki Kawai
-
Publication number: 20080037600Abstract: A wavelength conversion laser device includes a laser light source for emitting a first wavelength light, a nonlinear optical crystal for converting the first wavelength light into a second wavelength light, and a nonlinear optical crystal rotator for rotating the nonlinear optical crystal so as to change an incident angle of the first wavelength light into the nonlinear optical crystal. The device also includes a nonlinear optical crystal rotation driving controller for controlling a rotation amount of the rotator in accordance with an output change of the second wavelength light so that the nonlinear optical crystal has phase matching with the first wavelength light. The device further includes a light exit position adjustor for compensating an exit position change of the second wavelength light in accordance with the incident angle change of the first wavelength light so that the second wavelength light is outputted in a predetermined exit position.Type: ApplicationFiled: June 13, 2007Publication date: February 14, 2008Inventors: Byung Jin Ma, Kiyoyuki Kawai
-
Publication number: 20080037601Abstract: A method for preserving a mechanical alignment of a semiconductor laser (100) by use of a temperature control system (101). The semiconductor laser includes an optical mount (110) for mounting a semiconductor laser diode (131) and optical components (132,133). A thermal device (140) and a temperature sensor (180) are used for heating or cooling the optical mount and the semiconductor laser. The method includes adjusting the temperature of the semiconductor laser at a rate less than a predetermined temperature rate by use of the thermal device so as to minimise temperature-related faults, wherein the predetermined temperature rate is experimentally determined and is adapted to the semiconductor laser.Type: ApplicationFiled: July 5, 2007Publication date: February 14, 2008Applicant: Torsana Laser Technologies A/SInventor: Carl Christian Nielsen
-
Publication number: 20080037602Abstract: A laser diode array is formed on a heat sink having an insulating layer in which a plurality of grooves is formed through the ceramic layer and to or into the heat sink. A laser diode stack is soldered to the ceramic layer.Type: ApplicationFiled: July 26, 2007Publication date: February 14, 2008Inventors: Prabhu Thiagarajan, Mark McElhinney, Jason Helmrich, Feliks Lapinski
-
Publication number: 20080037603Abstract: In a rod-type solid laser apparatus, a laser rod 1 is held by a rod holder 5, the rod holder 5 is held in a recessed portion 40 formed in an adjust ring 7, and the adjust ring 7 is mounted on a cavity container 4. The rod holder 5 is pressed against the cavity container 4 by the bottom surface of the recessed portion 40 of the adjust ring 7, and the diameter of the recessed portion 40 is set slightly larger than the outside diameter of the rod holder 5, whereby the rod holder 5 can be moved freely in the radial direction of the recessed portion 40 within the recessed portion 40. On the adjust ring 7, there are radially disposed two adjust screws 8a, 8b and a spring 9 which respectively extend from the side surfaces of the adjust ring 7 into the recessed portion 40 in such a manner that they are contacted with the rod holder 5. The rod holder is pressed and supported by three points, that is, the respective leading ends of the adjust screws 8a, 8b and spring 9.Type: ApplicationFiled: April 15, 2004Publication date: February 14, 2008Inventors: Junji Kano, Shuichi Fujikawa, Takafumi Kawai
-
Publication number: 20080037604Abstract: Apparatus and method for collimating pump light of a first wavelength from laser diode(s) into a collimated beam within an enclosure having first and second optical ports, directing pump light from the collimated beam to the first port; and directing signal light inside the enclosure between the first and second port. The signal and pump wavelengths are different. The enclosure provides a pump block having a first port that emits pump light to a gain fiber outside the enclosure and that also passes signal light either into or out of the enclosure, and another port that passes signal light either out of or into the enclosure. Some embodiments use a dichroic mirror to direct pump light to the first port and direct signal light between the first and second ports. Some embodiments include a wavelength-conversion device to change the wavelength of at least some of the signal light.Type: ApplicationFiled: March 5, 2007Publication date: February 14, 2008Applicant: ACULIGHT CORPORATIONInventor: Matthias Savage-Leuchs
-
Publication number: 20080037605Abstract: An optical waveguide has a semiconductor laser section, an intermediate section, and an optical modulator section on a surface of a substrate. The distance of a surface extending outwardly from and transverse to both sides of a mesa stripe in the semiconductor laser section from the surface of the substrate is larger than the distance of a surface extending outwardly from and transverse to both sides of the mesa stripe in the optical modulator section from the surface of the substrate. The distance of a surface extending outwardly from and transverse to both sides of the mesa stripe in the intermediate section from the surface of the substrate decreases from the semiconductor laser section toward the optical modulator section.Type: ApplicationFiled: July 11, 2007Publication date: February 14, 2008Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Takeshi Yamatoya, Yasunori Miyazaki, Toshitaka Aoyagi
-
Publication number: 20080037606Abstract: A vertical cavity surface-emitting laser (VCSEL) is disclosed. The VCSEL includes a layer that at least partially defines an optical cavity having an optical axis. The VCSEL further includes a resonant reflector layer extending across at least part of the optical cavity. The resonant reflector layer has a refractive index that does not abruptly change laterally across the optical cavity. The refractive index of the resonant reflector layer includes contributions from a first material having a first refractive index and a second material having a second refractive index. At least one of the first material and the second material includes a polymer.Type: ApplicationFiled: July 19, 2007Publication date: February 14, 2008Applicant: Finisar CorporationInventors: Robert Morgan, Eva Strzeleck
-
Publication number: 20080037607Abstract: The present invention provides a laser diode with a current blocking layer without a pn-junction. The laser diode includes a lower cladding layer, an active region and an upper cladding layer on the GaAs substrate in this order. The active region includes first and second regions. The upper cladding layer, which includes a ridge structure, locates on the first region, while, the current blocking region is on the second region of the active region so as to sandwich the ridge structure. The current blocking layer of the invention is made of one of un-doped GaInP and un-doped AlGaInP grown at a relatively low temperature and shows high resistance greater than 105 ?·cm.Type: ApplicationFiled: August 13, 2007Publication date: February 14, 2008Inventor: Jun-ichi Hashimoto
-
Publication number: 20080037608Abstract: The present invention is a tunable semiconductor laser for swept source optical coherence tomography, comprising a semiconductor substrate; a waveguide on top of said substrate with multiple sections of different band gap engineered multiple quantum wells (MQWs); a multiple of distributed feedback (DFB) gratings corresponding to each said band gap engineered MWQs, each DFB having a different Bragg grating period; and anti-reflection (AR) coating deposited on at least the laser emission facet of the laser to suppress the resonance of Fabry-Perot cavity modes. Each DFB MQWs section can be activated and tuned to lase across a fraction of the overall bandwidth as is achievable for a single DFB laser and all sections can be sequentially activated and tuned so as to collectively cover a broad bandwidth, or simultaneously activated and tuned to enable a tunable multi-wavelength laser.Type: ApplicationFiled: August 11, 2006Publication date: February 14, 2008Inventors: Yan Zhou, Keith E. O'Hara