Did You Know...
...that Charles Goodyear performed some of his experiments on rubber while in debtor's prison? He was there so often he referred to it as his "hotel". Chronically in debt because of poor business sense and ill health, Goodyear depended on the generosity of friends and family. Even after he unlocked the secret to vulcanizing rubber, he was unable to improve his financial situation. When he died, his estate was $200,000 in debt.
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| Number | Title | Issue Date |
| 8121485 | RF-photonic transversal filter method and apparatus A method and apparatus for implementing an RF photonic transversal filter that utilizes tap apodization and wavelength reuse to obtain a high side lobe suppression together with narrow and configurable passbands. Several taps are obtained from one wavelength by usin... | 02/21/2012 |
| 8121484 | Bi-direction optical module installing light-emitting device and light-receiving device in signal package A bi-directional optical module with an improved optical crosstalk between the transmitter unit and the receiver unit is disclosed. The optical module provides the LD, the PD, the WDM filter secured with the block, and the package with the co-axial shape. The block ... | 02/21/2012 |
| 8107818 | Tunable filter A light is incident on a refractive diffraction grating 13, and is distributed for each of wavelengths at different angles to be outputted. A lens 14 converts the distributed lights into belt-shaped lights, and the belt-shaped lights are incident on a ... | 01/31/2012 |
| 8095011 | Wavelength division multiplexing filter, wavelength division multiplexing system, and wavelength division multiplexing method A wavelength division multiplexing filter according to the present invention is a wavelength division multiplexing filter having a variable filter shape. The wavelength division multiplexing filter has a resolution equal to 2N times (N being an integer, w... | 01/10/2012 |
| 8095010 | Method and device for tunable optical filtering An optical device includes an optical splitter having an input port, a first output port, a second output port and a resonant structure including at least a resonator, the optical splitter being adapted to receive at the input port a WDM optical signal and to output... | 01/10/2012 |
| 8073333 | Multiplex delay unit According to one embodiment, a multiplex delay unit comprises an optical all-pass filter (OAPF) adapted to apply continuously tunable group delay to a wavelength division multiplexing (WDM) signal so that all of its WDM components are delayed by substantially the sa... | 12/06/2011 |
| 8064769 | Method and system for hitless tunable optical processing A method for switching from a first optical path optically coupled to an optical processing device to a second optical path, the first and second optical paths optically connecting, in parallel configuration, a first optical switch to a second optical switch, accord... | 11/22/2011 |
| 8014676 | CMOS-compatible tunable microwave photonic band-stop filter According to one embodiment, a microwave photonic band-stop (MPBS) filter uses an electrical input signal to drive an optical Mach-Zehnder modulator. A modulated optical carrier produced by the modulator is applied to an optical filter having at least two tunable sp... | 09/06/2011 |
| 7974534 | Wideband microwave and millimeter wave filters using photonic spectral filtering An apparatus and method is disclosed for producing and filtering optical and electrical waveforms. The apparatus includes an electro-optical modulator, an optical filter capable of modulating at least two spectral regions within the bandwidth of the electrical wavef... | 07/05/2011 |
| 7912374 | High isolation wavelength division devices Techniques for designing optical devices with high reflection isolation are disclosed. According to one aspect of the devices, an optical filter and a reflecting element are used. Depending on implementation, the reflecting element may be another optical filter, a p... | 03/22/2011 |
| 7899330 | Compact high-resolution tunable optical filter using optical diffraction element and a mirror At least one diffraction element is used to diffract light of multiple wavelengths into different wavelength components. Instead of moving the diffraction element as in certain prior filters, light from the at least one element is reflected back towards the at least... | 03/01/2011 |
| 7889991 | Planar lightwave circuit based tunable 3 port filter The invention relates to a tunable optical add/drop module (TOADM) monolithically integrated on a single planar lightwave circuit (PLC). The present invention overcomes the shortcomings of the prior art by providing virtual pupils at the interface between the channe... | 02/15/2011 |
| 7860397 | Wavelength superimposing device, manufacturing method therefor, and WDM network system The present invention is a wavelength superimposing device that can restrain a system scale and further reduce an optical transmission loss, while broadcasting a video signal light in a WDM network system, a manufacturing method therefor, and the WDM network system,... | 12/28/2010 |
| 7809272 | Systems and methods for providing a three-port reconfigurable optical add-drop multiplexer with an improved edge profile and add/drop flexibility The technology described herein provides a low-cost three-port reconfigurable optical add-drop multiplexer (ROADM) with an improved edge profile and add/drop flexibility. The technology described herein further provides a tunable spectral filter utilizing two sets o... | 10/05/2010 |
| 7805077 | Scalable and movable DWDM usage of CWDM networks Systems and methods provide for the addition of DWDM modules to CWDM systems in order to increase bandwidth over existing lines. This allows for the expansion of communications capacity without the need to replace existing CWDM systems. The DWDM modules can be trans... | 09/28/2010 |
| 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 |
| 7742702 | Chirp switching circuit and optical transmission system A chirp switching circuit comprises a Mach-Zehnder modulator having a Y-branched part for branching an incoming optical signal into first and second optical signals and an X-branched part merging the first and second optical signals with each other, the Mach-Zehnder... | 06/22/2010 |
| 7680416 | WDM-PON having optical source of self-injection locked fabry-perot laser diode A wavelength division multiplexed-passive optical network includes an optical line terminal for generating downstream optical signals of discrete wavelengths and for receiving upstream optical signals of discrete wavelengths, a remote node, coupled to the optical li... | 03/16/2010 |
| 7676157 | Method and apparatus for providing gain equalization to an optical signal in an optical communication system An optical switch includes at least one input port for receiving a plurality of channel wavelengths of an optical signal and a plurality of output ports. A plurality of wavelength selective elements are also provided, which each select a channel wavelength from amon... | 03/09/2010 |
| 7623789 | Low loss WDM add drop node In an optical fiber network bidirectional WDM traffic is sent on one optical main transmission fiber (1) between two nodes (A, B) connected in the path of the transmission fiber. The bidirectional traffic between a pair of nodes is carried on two different wa... | 11/24/2009 |
| 7542679 | Optical transmission systems, devices, and method A method of receiving optical channels including providing an optical band filter configured to filter at least one optical channel from a multiple channel optical signal and provide a band filtered optical signal. A periodic filter is configured to filter and/or sh... | 06/02/2009 |
| 7486891 | Multi-port high isolation filters Techniques for designing optical devices with high isolation are disclosed. The high isolation is achieved by causing a reflected light signal to go through another filter. According to one embodiment, an optical apparatus comprises a first optical filter configured... | 02/03/2009 |
| 7457544 | Single channel four-port group delay compensation equalizer A group delay compensation equalizer is disclosed that employs a single channel four-port WDM device for compensating the group delay experienced by a plurality of wavelengths transmitted over different paths. The transmission differential between two wavelengths is... | 11/25/2008 |
| 7454143 | Reconfigurable thin film based DWDM devices for reconfigurable add-drop optical systems A reconfigurable thin film based dense wavelength division multiplexing (DWDM) device is described for hitless switching of wavelengths by employing a reconfigurable filtering device. The reconfigurable filtering device is based on a mechanical switching of a filter... | 11/18/2008 |
| 7447434 | Optical transmission systems, devices, and method A method of receiving optical channels including providing an optical band filter configured to filter at least one optical channel from a multiple channel optical signal and provide a band filtered optical signal. A periodic filter is configured to filter and/or sh... | 11/04/2008 |
| 7433600 | Optical node device and system including the device Disclosed herein is an optical node device applicable to an optical network including a closed loop provided by an optical fiber. This optical node device includes a tunable wavelength selecting element adapted to input WDM signal light obtained by wavelength divisi... | 10/07/2008 |
| 7433601 | Optical network and optical add/drop apparatus Provided are a plurality of fixed wavelength drop filters 35 demultiplexing optical signals having a plurality of different fixed wavelengths, a plurality of fixed wavelength add filters 36 provided corresponding respectively to the fixed wavelength dr... | 10/07/2008 |
| 7426347 | Shared optical performance monitoring An apparatus for shared optical performance monitoring (OPM) is provided. A wavelength sensitive device receives light at an input port and routes it wavelength selectively to a set of output ports. To perform optical performance monitoring on the output ports, a mo... | 09/16/2008 |
| 7421168 | Integrated optical channelizer A signal channelizer (10) includes an input waveguide (14) carrying an inputted signal (20) having a plurality of wavelengths. The input waveguide (14) has an input port (22) for receiving the inputted signal (20). A plurali... | 09/02/2008 |
| 7415210 | Bidirectional optical signal multiplexer/demultiplexer 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 n... | 08/19/2008 |
| 7406244 | Method of using an ultrathin optical element The present invention provides an ultra-thin high-precision glass optic and method of manufacturing the same. The optic has an axial thickness that is less than 1,000 microns. A pattern and/or coating is disposed on a surface of the optic to provide attenuation of l... | 07/29/2008 |
| 7406262 | Optical transmission device An optical transmission device improved in quality and reliability of OADM function and permitting configuration of highly-flexible, economical OADM networks. A wavelength tunable filter variably selects a wavelength according to a control frequency. A filter contro... | 07/29/2008 |
| 7405859 | Method and apparatus for selecting wavelength A wavelength selecting apparatus includes a wavelength selecting filter and that a monitoring filter are similar acousto-optic tunable filters; a light source that outputs light having a specific wavelength to the monitoring filter; a light receiving unit that detec... | 07/29/2008 |
| 7403676 | Optical waveguide module An optical waveguide module includes a wiring board, and a light-receiving element and optical waveguide substrate that are positioned on both sides of this wiring board. The wiring board includes a base member having transparency to light of the wavelength that can... | 07/22/2008 |
| 7398021 | Optical transmitter and passive optical network using the same An optical transmitter including a multi-lambda source to output injection light consisting of a plurality of injection wavelengths in channels, a circulator having a first port, a second port, and a third port, the circulator receiving the injection light at the fi... | 07/08/2008 |
| 7394986 | Flat top optical filtering component The invention relates to wavelength-selective optical filters for allowing light of a narrow optical spectral band, centered around a wavelength (λc) to pass through them, while reflecting the wavelengths lying outside this band. According to the inventi... | 07/01/2008 |
| 7394982 | Current sensing system A current sensing system comprises a current transformer; a burden resistor connected across a secondary of the current transformer; a piezo-optic sensor coupled to the burden resistor, comprising a piezoelectric transducer, an optical fiber and a first optical filt... | 07/01/2008 |
| 7389047 | Optical ring transmission network The network comprises an optical ring link (F) and a concentrator (HUB) that sends via one end of the link “downlink” optical signals carried by respective wavelengths and receives “uplink” optical signals via the other end of the link. The link is divided i... | 06/17/2008 |
| 7389050 | Wavelength multiplexer/demultiplexing device For use in combining and/or splitting a 3-wavelength multiplexed light, in which if central wavelengths of the three bands are denoted as λ1, λ2 and λ3, in a relation that 0.92≦λ2/λ1≦1.08, 0.20≦λ3/λ1≦0.92 or 1.08≦λ3/λ1≦5.00, the wavelength multi... | 06/17/2008 |
| 7356259 | Optical bypass upgrade configuration Optical bypass node upgrade configurations are disclosed: (1) a configuration where optical taps are pre-positioned in wavelength division multiplex (WDM) line systems terminating at optical-electrical-optical (OEO) core switching nodes to allow for future upgrade o... | 04/08/2008 |
