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| Number | Title | Issue Date |
| 7970280 | Thermally-floating transmitter wavelength grid of signal channels in a WDM transmission system A method and apparatus is provided for tracking a thermally floating wavelength signal channel grid generated at an optical transmitter (Tx) in an optical transmission system or optical network where the wavelengths of the individual Tx signal channels may move in w... | 06/28/2011 |
| 7899280 | Low loss lateral optical waveguide intersections A geometrically shaped optical waveguide crossing with minimal transmission loss is described. A symmetrically tapered waveguide intersection is used to minimize loss in the intersecting region where at least two optical waveguides cross one another. The present inv... | 03/01/2011 |
| 7885492 | Transmitter photonic integrated circuit (TxPIC) chips 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 o... | 02/08/2011 |
| 7881612 | Optical autodiscovery for automated logical and physical connectivity check between optical modules Optical autodiscovery is provide between two optical modules to insure that when an optical signal is coupled between the two optical module, the optical signal from a first module does not interfere with operation of a second module. The autodiscovery is implemente... | 02/01/2011 |
| 7877016 | Photonic integrated circuit (PIC) transceivers for an optical line terminal (OLT) and an optical network unit (ONU) in passive optical networks (PONs) A photonic integrated circuit (PIC) for a PON transceiver comprises a single monolithic chip having a modulated transmitter laser diode of a first wavelength, λ1, for generating a first communication signal outgoing from the chip via an input/output port... | 01/25/2011 |
| 7873133 | Recovery of client clock without jitter 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 compens... | 01/18/2011 |
| 7801446 | Wavelength division multiplexed optical communication system with rapidly-tunable optical filters The present invention provides a WDM optical system that includes a tunable filter for selecting one or more optical channels from a WDM optical signal. A portion of a WDM signal enters a first optical filter stage that exhibits a periodic transmission spectrum and ... | 09/21/2010 |
| 7801402 | Receiver photonic integrated circuit (RxPIC) chip utilizing compact wavelength selective decombiners A monolithic receiver photonic integrated circuit (RxPIC) chip includes a plurality of optical signal channels together with other active elements integrated on a semiconductor chip, which chips further include a wavelength selective decombiner comprising a supergra... | 09/21/2010 |
| 7792396 | Probe card for testing in-wafer photonic integrated circuits (PICs) and method of use Method and apparatus for utilizing a probe card for testing in-wafer photonic integrated circuits (PICs) comprising a plurality of in-wafer photonic integrated circuit (PIC) die formed in the surface of a semiconductor wafer where each PIC comprises one or more elec... | 09/07/2010 |
| 7792017 | Virtual local area network configuration for multi-chassis network element A system, apparatus, and method for providing a plurality of internal VLANs within a networking element/node are described. Internal VLAN topologies are provisioned so that a particular VLAN(S) communicate traffic to corresponding applications. This segregation of i... | 09/07/2010 |
| 7773837 | Monolithic transmitter photonic integrated circuit (TXPIC) with a transversely disposed output 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 o... | 08/10/2010 |
| 7769051 | Optical transmission network with asynchronous mapping and demapping and digital wrapper frame for the same 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 impai... | 08/03/2010 |
| 7751658 | Monolithic transmitter photonic integrated circuit (TxPIC) having tunable modulated sources with feedback system for source power level or wavelength tuning 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 o... | 07/06/2010 |
| 7747114 | Tilted combiners/decombiners and photonic integrated circuits (PICs) employing the same A monolithic optical transmitter photonic integrated circuit (TxPIC) comprises a plurality of integrated modulated sources which, when all operated at constant current, display a power output that varies as a function of array position similar to a quadratic-shaped ... | 06/29/2010 |
| 7734191 | Forward error correction (FEC) enabled photonic integrated circuit (PICs) chips with multiple signal channels 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 addi... | 06/08/2010 |
| 7697580 | Monitoring of a laser source with front and rear output photodetectors to determine frontal laser power and power changes over laser lifetime A power monitoring and correction to a desired power level of a laser or group of lasers utilizes two photodetectors which are employed to accurately determine the amount of output power from the front end or “customer” end of a laser or a plurality of such lase... | 04/13/2010 |
| 7684399 | Optical transmission network with asynchronous mapping and demapping and digital wrapper frame for the same 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 impai... | 03/23/2010 |
| 7680368 | Monolithic transmitter photonic integrated circuit (TxPIC) with a traversely disposed output 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 o... | 03/16/2010 |
| 7680364 | Wavelength locking and power control systems for multi-channel photonic integrated circuits (PICS) A transmissive active channel element is provided in each signal channel of a monolithic multi-channel TxPIC where each channel also includes a modulated source. The active channel element functions both as a power control element for both monitoring and regulating ... | 03/16/2010 |
| 7672546 | Optical transport network having a plurality of monolithic photonic integrated circuit semiconductor chips 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 o... | 03/02/2010 |
| 7636522 | Coolerless photonic integrated circuits (PICs) for WDM transmission networks and PICs operable with a floating signal channel grid changing with temperature but with fixed channel spacing in the floating grid A coolerless photonic integrated circuit (PIC), such as a semiconductor electro-absorption modulator/laser (EML) or a coolerless optical transmitter photonic integrated circuit (TxPIC), may be operated over a wide temperature range at temperatures higher then room t... | 12/22/2009 |
| 7634195 | Digital optical network architecture A digital optical network (DON) is a new approach to low-cost, more compact optical transmitter modules and optical receiver modules for deployment in optical transport networks (OTNs). One important aspect of a digital optical network is the incorporation in these ... | 12/15/2009 |
| 7633621 | Method for measurement of analyte concentrations and semiconductor laser-pumped, small-cavity fiber lasers for such measurements and other applications A hybrid laser comprising a semiconductor pump laser and small-cavity rare earth fiber laser where laser cavities of both lasers are butt coupled or otherwise optically coupled to form a plurality of laser cavities that produce a plurality of emission wavelengths, o... | 12/15/2009 |
| 7630595 | Thermo-optic devices providing thermal recirculation Thermo-optical devices providing heater recirculation in an integrated optical device are described. The thermo-optical devices include at least one waveguide having a non-linear path length in thermal communication with a thermal device. Methods of fabrication and ... | 12/08/2009 |
| 7627254 | Automated optical link power control A system, apparatus and method are described for controlling the gain across one or more amplifier nodes within an optical span. In one embodiment, a fast local amplifier constant gain control loop is provided that maintains a constant gain across an amplifier node ... | 12/01/2009 |
| 7627205 | Thermo-optic devices providing thermal recirculation Thermo-optical devices providing heater recirculation in an integrated optical device are described. The thermo-optical devices include at least one waveguide having a non-linear path length in thermal communication with a thermal device. Methods of fabrication and ... | 12/01/2009 |
| 7625771 | Method of reducing insertion loss in a transition region between a plurality of input or output waveguides to a free space coupler region A method for reducing insertion loss in a transition region between a plurality of input or output waveguides to a free space coupler region in a photonic integrated circuit (PIC) includes the steps of forming a passivation layer over the waveguides and region and f... | 12/01/2009 |
| 7577325 | Method of fabricating a polarization sorter A method of fabricating a passive polarization sorter includes the steps of providing first and second waveguides. The first waveguide has an input and an output. The first waveguide supporting at least one guided TE polarized mode of mode ranking mode-i-TE and at l... | 08/18/2009 |
| 7574146 | Pattern-dependent error counts for use in correcting operational parameters in an optical receiver 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... | 08/11/2009 |
| 7570845 | Deployment of electro-optic amplitude varying elements (AVEs) and electro-optic multi-functional elements (MFEs) in photonic integrated circuits (PICs) Electro-optic amplitude varying elements (AVEs) or electro-optic multi-function elements (MFEs) are integrated into signal channels of photonic integrated circuits (PICs) or at the output of such PICs to provide for various optical controlling and monitoring functio... | 08/04/2009 |
| 7570671 | Method and apparatus for deploying forward error correction in optical transmission networks and the deployment of photonic integrated circuit (PIC) chips with the same An apparatus and method for uniformly sharing across a plurality of channel signals FEC coding gain which may be achieved through FEC encoding of a higher baud rate electrical data signal or through multiplexed or combined electrical data signals from multiple data ... | 08/04/2009 |
| 7555220 | Chromatic dispersion compensator (CDC) in a photonic integrated circuit (PIC) chip and method of operation An optical equalizer/dispersion compensator (E/CDC) comprises an input/output for receiving a multiplexed channel signal comprising a plurality of channel signals of different wavelengths. An optical amplifier may be coupled to receive, as an input/output, the multi... | 06/30/2009 |
| 7555178 | Periodic optical filter A periodic optical filter for interleaving a plurality of optical signals to provide a multiplexed signal for transmission over an optical fiber is disclosed. The periodic optical filter includes a first optical filter constructed to receive at least two optical sig... | 06/30/2009 |
| 7551815 | Method of monitoring and controlling the bit error rate (BER) in an optical communication network 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 ... | 06/23/2009 |
| 7546007 | Broadband optical via A broadband optical via provides a low loss interconnection between waveguides in two vertically adjacent planar waveguiding layers. Two waveguides, one in each planar layer, evanescently interact over an interaction length, and substantially all of the power on one... | 06/09/2009 |
| 7546001 | Monolithic photonic integrated circuit (PIC) with forward error correction (FEC) Monolithic photonic integrated circuits (PICs) utilize forward error correction (FEC) joint encoder or plural encoders or a joint decoder or plural decoders. ... | 06/09/2009 |
| 7539365 | Deployment of electro-optic amplitude varying elements (AVEs) and electro-optic multi-functional elements (MFEs) in photonic integrated circuits (PICs) Electro-optic amplitude varying elements (AVEs) or electro-optic multi-function elements (MFEs) are integrated into signal channels of photonic integrated circuits (PICs) or at the output of such PICs to provide for various optical controlling and monitoring functio... | 05/26/2009 |
| 7529436 | Optical combiner/decombiner with reduced insertion loss A photonic integrated circuit that includes a plurality of active and passive components on a substrate where one of the components is an optical combiner/decombiner having at least one free space coupler region and a plurality of longitudinal ridge waveguides each ... | 05/05/2009 |
| 7526151 | Highly symmetric optical structures An intermediate structure used to form an integrated optics device comprising a substrate, a cladding on the substrate, at least one real waveguide on the cladding, and at least one dummy waveguide optically coupled with the real waveguide. The real waveguide forms ... | 04/28/2009 |
| 7526150 | Deployment of electro-optic amplitude varying elements (AVES) and electro-optic multi-functional elements (MFES) in photonic integrated circuits (PICS) Electro-optic amplitude varying elements (AVEs) or electro-optic multi-function elements (MFEs) are integrated into signal channels of photonic integrated circuits (PICs) or at the output of such PICs to provide for various optical controlling and monitoring functio... | 04/28/2009 |
