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| Number | Title | Issue Date |
| 8184929 | Method of tuning optical components integrated in a monolithic photonic integrated circuit (PIC) An optical transmitter comprises a monolithic transmitter photonic integrated circuit (TxPIC) chip that includes an array of modulated sources formed on the PIC chip and having different operating wavelengths approximating a standardized wavelength grid and providin... | 05/22/2012 |
| 8155488 | 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 ... | 04/10/2012 |
| 8098996 | Adaptable duobinary generating filters, transmitters, systems and methods A variety of adaptable electronic duobinary generating filters to be used in communication systems are provided, each filter generating an adaptable electronic duobinay signal which is optimized for system impairments. According to one exemplary implementation, an a... | 01/17/2012 |
| 8064486 | Determination of channel latency within a round-trip path The present invention provides a system, apparatus, and method for determining latency differences in channels within a link at a single test site. In particular, the method allows for a single transmitting device to determine distinct latency differences on both tr... | 11/22/2011 |
| 8031704 | Network planning and optimization of equipment deployment Embodiments of the present invention provide systems, devices and methods for improving the efficient deployment and configuration of networking equipment within a network build-out. In certain embodiments of the invention, an iterative analysis of inter-node equipm... | 10/04/2011 |
| 7983559 | Configurable multi-rate optical network port and processing modules Embodiments of the present invention provide an optical port that can be configured to support either high speed or low speed optical signals. In particular, these embodiments comprise a switch that defines a data-rate dependent path between the front-end optics of ... | 07/19/2011 |
| 7974504 | Reflection suppression in a photonic integrated circuit Embodiments of the present invention provide systems, devices and methods in which optical reflections are reduced in a photonic integrated circuit. These embodiments include reflection suppression elements which operate to dissipate optical energy that would otherw... | 07/05/2011 |
| 7973265 | Coupled optical waveguide resonators with heaters for thermo-optic control of wavelength and compound filter shape An integrated optical device is disclosed comprising a substrate, optical waveguide, and compound optical resonator having a temperature sensor, at least two coupled optical resonators, and a heater localized to each optical resonator. An optical input signal is cou... | 07/05/2011 |
| 7965915 | Hermaphroditic u-guide alignment structures and method thereof An integrated optical waveguide circuit apparatus having an optical processing area, waveguide ports for optical processing, and at least one waveguide structure, the at least one waveguide structure going around the optical processing area. Methods for making the i... | 06/21/2011 |
| 7903910 | Coupled optical waveguide resonators with heaters for thermo-optic control of wavelength and compound filter shape An integrated optical device is disclosed comprising a substrate, optical waveguide, and compound optical resonator having a temperature sensor, at least two coupled optical resonators, and a heater localized to each optical resonator. An optical input signal is cou... | 03/08/2011 |
| 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 |
| 7848369 | Optical modulator drive circuit with integrated low power output bias voltage control 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 dat... | 12/07/2010 |
| 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 |
| 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 |
| 7792403 | Adiabatic polarization converter The present invention relates to a waveguide structure, and methods for making the same. The waveguide structure has a polarization rotator for rotating the polarization of the electromagnetic signal, preferably by about ninety-degrees. In one embodiment, the polari... | 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 |
| 7751713 | Communication network with skew path monitoring and adjustment 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 wavel... | 07/06/2010 |
| 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 |
| 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 |
| 7716560 | Protection switch decision architecture 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 red... | 05/11/2010 |
| 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 |
| 7583879 | Coupled optical waveguide resonators with heaters for thermo-optic control of wavelength and compound filter shape An integrated optical device is disclosed comprising a substrate, optical waveguide, and compound optical resonator having a temperature sensor, at least two coupled optical resonators, and a heater localized to each optical resonator. An optical input signal is cou... | 09/01/2009 |
| 7577320 | Low loss lateral optical waveguide intersections A geometrically shaped optical waveguide crossing or intersection 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 ... | 08/18/2009 |
| 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 |
| 7519246 | Photonic integrated circuit (PIC) 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... | 04/14/2009 |
| 7519240 | Multi-section coupler to mitigate guide-guide asymmetry A wavelength independent multi-section optical coupler having at least three optical couplers, and at least two differential phase cells. Each optical coupler has two waveguides forming a coupling region having a net coupling value. The coupling value for each coupl... | 04/14/2009 |
| 7512295 | Transmitter photonic integrated circuits (TXPICS) with directly modulated lasers and wavelength selective combiners 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... | 03/31/2009 |
| 7499610 | Method of using a polarization sorter A method of using a passive polarization sorter comprising the step of deploying a first waveguide and a second waveguide forming an adiabatic region along a portion of their length. Then, an input optical signal is introduced into the first waveguide wherein light ... | 03/03/2009 |
| 7489838 | Optical transmitter An optical transmitter comprises an array of modulated sources having different operating wavelengths approximating a standardized wavelength grid and providing signal outputs of different wavelengths. Signal outputs of the modulated sources are optically coupled to... | 02/10/2009 |
| 7483599 | Method of calibrating a monolithic transmitter photonic integrated circuit (TXPIC) chip A method of calibrating a monolithic transmitter photonic integrated circuit (TxPIC) chip is disclosed where the chip contains integrated arrays of laser sources and electro-optic modulators forming a plurality of different wavelength signal channels where each lase... | 01/27/2009 |
| 7477807 | Monolithic transmitter photonic integrated circuit (TxPIC) semiconductor chip 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... | 01/13/2009 |
| 7471857 | Method of tuning optical components integrated in a monolithic photonic integrated circuit (PIC) An optical transmitter comprises a monolithic transmitter photonic integrated circuit (TxPIC) chip that includes an array of modulated sources formed on the PIC chip and having different operating wavelengths approximating a standardized wavelength grid and providin... | 12/30/2008 |
| 7468237 | Integrated optical circuits having drop-in locations for optical circuit elements A plurality of mask images defines an optical circuit image in photoresist. Each of the mask images comprises parts of the optical circuit and the totality of all mask images together defines an optical circuit. The optical circuit is thus made up of plural optical ... | 12/23/2008 |
| 7460742 | Method and apparatus for providing an antireflection coating on the output facet of a photonic integrated circuit (PIC) chip An on-chip photodiode is provided in a photonic integrated circuit (PIC) on a semiconductor chip to monitor or check for antireflection qualities of an AR coating applied to the front facet of the semiconductor chip. ... | 12/02/2008 |
| 7457496 | 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... | 11/25/2008 |
