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| Number | Title | Issue Date |
| 8175427 | Apparatus and methods for use of a tunable optical source in safety curtain applications Apparatus and methods for using a tunable optical source in safety curtain applications provide for enhanced operation of the safety curtain. In an embodiment, a safety curtain includes a transmit unit and a receive unit to operate as the safety curtain, where a sin... | 05/08/2012 |
| 8175428 | Optical communications system with selective block/add capability of an optical channel An optical communications system has a selective block/add capability of an optical channel. An optical beam separator receives and separates an input mixed optical beam into a separated optical channel and a remainder optical beam. A block/add unit receives as an i... | 05/08/2012 |
| 8111956 | Method and apparatus for confirming optical fibers connection in optical connector Provided is a method for confirming optical fibers connection in a connection part in an optical connector, including: allowing light to pass through a first optical fiber and allowing cladding mode light to disappear; and detecting a difference in light intensity i... | 02/07/2012 |
| 8023782 | Method and apparatus for demultiplexing optical signals in a passive optical network Methods and structures are disclosed demultiplexing optical signals transmitted over an optical fiber into a silicon substrate and to multiple detectors. The silicon substrate has two spaced-apart surfaces and a diffractive element disposed adjacent to one of the su... | 09/20/2011 |
| RE42678 | Reconfigurable optical add-drop multiplexers with servo control and dynamic spectral power management capabilities This invention provides a novel wavelength-separating-routing (WSR) apparatus that uses a diffraction grating to separate a multi-wavelength optical signal by wavelength into multiple spectral characters, which are then focused onto an array of corresponding channel... | 09/06/2011 |
| 8005328 | Optical add/drop module A WDM add/drop module. The drop portion of the add/drop module is accomplished by using thin film filters or thin film interleavers. The add portion of the add/drop module uses fused fiber interleavers for the less critical stages of the multiplexing process. In a f... | 08/23/2011 |
| 8000569 | Optical device comprising a compact dispersing system A fibre optic transmission application, in particular, an optical device that can be incorporated into telecommunications equipment as well as into test and measurement equipment with reduced insertion loss, reduced crosstalk effects and reduced height, with increas... | 08/16/2011 |
| 7991251 | Optical module mounted with WDM filter A filter element includes a first glass substrate having a pair of parallel surfaces and a band pass filter arranged on one of the parallel surfaces, a pair of single-crystal substrates (Si wafers) each including a primary surface formed with a depression having an ... | 08/02/2011 |
| RE42540 | Reconfigurable optical add-drop multiplexer incorporating sets of diffractive elements A reconfigurable add-drop multiplexer (R-OADM) comprises an array of channel waveguides coupling two groups of diffractive element sets on a slab waveguide. The channel waveguides include switchable reflectors or are coupled to other channel waveguides by optical sw... | 07/12/2011 |
| RE42521 | Reconfigurable optical add-drop multiplexers employing polarization diversity This invention provides a novel wavelength-separating-routing (WSR) apparatus that uses a diffraction grating to separate a multi-wavelength optical signal by wavelength into multiple spectral channels, which are focused onto an array of corresponding channel microm... | 07/05/2011 |
| 7965911 | Method of operating a tunable optical device An optical wavelength routing device utilizes a free space optical beam propagating therethrough is provided. The device includes at least one optical fiber input, at least one optical fiber output, an optical element having an actuator with at least one tilt axis a... | 06/21/2011 |
| RE42368 | Reconfigurable optical add-drop multiplexers with servo control and dynamic spectral power management capabilities This invention provides a novel wavelength-separating-routing (WSR) apparatus that uses a diffraction grating to separate a multi-wavelength optical signal by wavelength into multiple spectral channels, which are then focused onto an array of corresponding channel m... | 05/17/2011 |
| 7899281 | Large amplitude high frequency optical delay Optical delay line system that includes a retro-reflection mirror which is displaced along a circular path while being maintained in angular alignment with launch and return sources of light subject the components of the system to minimum levels of unbalanced linear... | 03/01/2011 |
| 7869672 | Optical assemblies and methods for fabrication of optical assemblies An optical assembly is formed with a silicon substrate having a first surface and a second surface confronting the first surface. A reflective coating is formed over the first surface. Multiple diffraction gratings are formed integrally within the second surface of ... | 01/11/2011 |
| 7869673 | Remote larger effective area optical fiber Embodiments described herein relate to an optical fiber stretch that may experience forward Raman amplification in which the peak optical signal power occurs at some distance from the transmitter. Smaller effective area optical fiber is used at a portion of the opti... | 01/11/2011 |
| 7860359 | Optical band splitter/combiner and apparatus comprising the same An optical device for splitting/combining a first and a second continuous optical wavelength bands, each wider than 10 nm, has a first, a second, a third, a fourth and a fifth optical splitting devices optically coupled in cascade and a first, a second, a third and ... | 12/28/2010 |
| 7853101 | Bi-rate adaptive optical transfer engine One embodiment of the present invention provides a system for the transmission of data between an optical bus and an electronic component at a speed independent from a clock speed of the electrical component; the system comprising an optical data storage component c... | 12/14/2010 |
| 7844145 | MEMS-based multi-channel Fabry-Perot interferometer system with increased tuning range and resolution A system includes a first Fabry-Perot interferometry channel and a second Fabry-Perot interferometry channel serially and optically coupled to the first Fabry-Perot interferometry channel. One channel of the first and second Fabry-Perot interferometry channels has a... | 11/30/2010 |
| 7840103 | Performance compensated Tx/Rx optical devices A wavelength division multiplexing system has a wavelength division multiplexer and a wavelength division demultiplexer. The wavelength division demultiplexer is in series with the wavelength division multiplexer to process at least one optical signal to generate at... | 11/23/2010 |
| 7831118 | Coarse wavelength division multiplexing optical transmission system, and coarse wavelength division multiplexing optical transmission method In a CWDM optical transmission system of the present invention, in place of an optical signal of at least one wave among a plurality of optical signals corresponding to a CWDM system, a DWDM light output from an additional light transmission unit of a DWDM system is... | 11/09/2010 |
| 7822304 | Laser beam multiplexer A laser beam multiplexer capable of easily multiplexing a plurality of laser beams is provided. A laser beam multiplexer includes a multiplexing element having a hollow portion with a sectional elliptical shape, in which the multiplexing element includes: a pluralit... | 10/26/2010 |
| 7817883 | Optical assembly and method of making same An optical assembly includes a first transparent substrate having first and second surfaces, a second transparent substrate having substantially parallel third and fourth surfaces, a reflective portion on the second transparent substrate, a plurality of filters betw... | 10/19/2010 |
| 7813601 | Reconfigurable optical add/drop multiplexer Disclosed is an add-drop multiplexer that receives an optical signal having a plurality of channels. The multiplexer spatially separates the channels, and a spatial light modulator within the multiplexer, which in some embodiments is a switched blazed grating, route... | 10/12/2010 |
| 7805033 | Optical wavelength division multiplexed multiplexer/demultiplexer for an optical printed circuit board and a method of manufacturing the same The invention provides an optical mux/demux for an optical printed circuit board. The mux/demux comprises: a first waveguide formed on a support layer for carrying a wavelength division multiplexed optical signal; a separator/combiner for separating the wavelength d... | 09/28/2010 |
| 7787722 | Method for coordinating an uplink TDMA access shared by several sub-networks of a passive optical network (PON) A Passive Optical Network (PON) comprises at least a first sub-network (16) with a first Optical Line Terminal (4) and a first set of Optical Network Units (8, 12), a second sub-network (18) with a second Optical Line Terminal (6) ... | 08/31/2010 |
| 7773838 | Method and network architecture for upgrading legacy passive optical network to wavelength division multiplexing passive optical network based next-generation passive optical network The present invention discloses a network architecture for upgrading a legacy time division multiplexing-passive optical network (TDM-PON) to a wavelength division multiplexing-passive optical network (WDM-PON) based next-generation passive optical network (next-gen... | 08/10/2010 |
| 7769257 | Optical transmission system and signal speed converting apparatus A signal speed converting apparatus to be connected to a WDM transmission end office, comprising a first interface connected to a first optical line group, a plurality of second interfaces connected to a second optical line group, and a speed converter. The first in... | 08/03/2010 |
| 7769256 | Method and system for performance monitor for digital optical DWDM networks A system for performance monitoring for a DWDM network. The system includes a photonic integrated device configured to receive an optical signal and output a first plurality of electrical signals for a plurality of channels respectively. The system also includes a c... | 08/03/2010 |
| 7756369 | OSNR monitoring apparatus and method using polarization splitting A method and apparatus is disclosed for measurement and monitoring of in-band optical signal to noise ratio (OSNR). A two channel optical spectrum analyzer (OSA) is advantageously applied in acquiring wavelength division multiplex (WDM) signal data after it has been... | 07/13/2010 |
| 7738750 | Compact, low-loss optical wavelength multiplexer/demultiplexer The multiplexer/demultiplexer has a planar reflector, a planar first filter element and a planar second filter element offset from the first filter element in a first direction to receive light reflected and transmitted from a first location on the first filter elem... | 06/15/2010 |
| 7738749 | Photonic crystal having heterostructure and optical device using the photonic crystal The present invention has been made for providing a photonic crystal capable of multiplexing or demultiplexing light within a wavelength band having a certain width. It includes a slab-shaped body 21 provided with plural forbidden band zones 211 and | 06/15/2010 |
| 7734129 | Super-s multiple-tapped optical delay line A photonic processor having a high spectral resolution which separates an input optic signal into numerous channels and a method of constructing same are provided. The photonic processor includes an optical delay line spiral having dips to compensate for path length... | 06/08/2010 |
| 7720330 | Bidirectional wavelength cross connect architectures using wavelength routing elements Bidirectional wavelength cross connects include a plurality of ports, each configured to receive an input optical signals, each input optical signal having a plurality of spectral bands. At least one of the plurality of ports is disposed to simultaneously transmit a... | 05/18/2010 |
| 7715669 | Fiber optic link, a transceiver for use in the link, and methods for designing and constructing fiber optic links and transceivers A fiber optic link is provided that uses a relatively low-cost transceiver that incorporates relatively inexpensive low bandwidth optical and electrical components to achieve high data rate operations. The data rate of the fiber optic link can be greater than the da... | 05/11/2010 |
| 7711218 | Optical reception apparatus and controlling method thereof The optical reception apparatus of the invention branches into two an RZ-DQPSK optical signal input from an optical transmission path via an optical amplifier, respectively sends this to delay interferometers and photoelectric converters on a pair of arms, separatel... | 05/04/2010 |
| 7706643 | Low loss, noise filtering multiplexer/demultiplexer for reconfigurable OADMs Agile OADM structures having a range of tradeoffs between costs and flexibility are disclosed. In certain implementations, cyclic AWGs (arrayed waveguide gratings) are employed. Excellent optical performance is achieved along with relatively low initial and upgrade ... | 04/27/2010 |
| RE41247 | Optical transport system A bi-directional, redundant, optical transport system is configured to provide a non-blocking, bi-directional, multi-channel, protocol independent optical transport system for the simultaneously transfer of digital, analog, and discrete data between a plurality data... | 04/20/2010 |
| 7697803 | Systems and methods for phase control for RZ-DQPSK modulation RZ-DQPSK (Return-to-Zero Differential Quadrature Phase Shift Keying) systems and methods are provided with a single real-time phase alignment mechanism. The present invention eliminates the requirement for phase adjustment between a carver modulator and a DQPSK modu... | 04/13/2010 |
| 7693365 | Dispersion mapping of transmitted channels in a WDM system Chromatic dispersion is determined based on the arrival times of different frames of data in a wavelength division multiplexed (WDM) system having an optical communication link. Namely, a first frame is transmitted on a first optical channel, which is supplied to th... | 04/06/2010 |
| 7693364 | Apparatus, system and method for a tunable optical filter A tunable optical filter comprises an optical switch having a single first optical port and a plurality of second optical ports; a plurality of band pass filters, each one of the band pass filters optically coupled to a respective second optical port; and an optical... | 04/06/2010 |
