Did You Know...
...that the Slinky toy was the result of a failed attempt by engineer Richard James to produce an antivibration device for ship instruments? His goal was to develop a spring that would instantaneously counterbalance the wave motion that rocks a ship at sea. Instead, he developed the Slinky.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 8175455 | Optical transmission system and optical transmission control method The present invention is intended to provide an optical transmission system which is applicable not only to a known signal but also to an unknown signal, and has a high reliability at a low cost. A branching device branches an optical transmission output of a transm... | 05/08/2012 |
| 8095005 | Multimode fiber link probe A link probe for multimode fibers in optical networks is provided. An optical test probe signal is sent over a multimode fiber of an optical network link and a receiver converts the optical signal into an electronic signal with a trigger generated by the clock recov... | 01/10/2012 |
| 8014669 | In-channel residual chromatic dispersion measurement A system generates optical pulses, that include two frequencies within one optical channel, at a first end of an optical link, and receives the optical pulses at a second end of the optical link. The system also sets a frequency difference for the two frequencies of... | 09/06/2011 |
| 7995918 | Polarization mode dispersion monitoring and fault correlation A method and apparatus for a monitoring technique for the rate of change of polarization state and of the polarization mode dispersion is proposed. This technique is used for performance monitoring and fault correlation as well as for the verification of commitments... | 08/09/2011 |
| 7881610 | Method of transmitting an optical signal in an optical transmission system and optical transmission system for implementing such a method Described is a method of transmitting an optical signal in an optical transmission system. The method comprises: providing a length of an optical fiber having a zero chromatic dispersion wavelength, wherein the optical fiber belongs to an optical fiber group and whe... | 02/01/2011 |
| 7877010 | Device for monitoring the quality of an optical signal by filtering its beat component An optical signal quality monitor device includes a local oscillator that generates a local oscillation signal, with which a mixer mixes an input optical signal to output a mixed signal, of which at least one beat component a filter that extracts. An intensity detec... | 01/25/2011 |
| 7668459 | Dispersion monitoring method and apparatus and dispersion slope temperature dependency compensation method and apparatus In a wavelength division multiplexing optical transmission system, in order to know an influence amount of a temperature dependency of a dispersion slope, a method of monitoring a dispersion variation amount in two or more of wavelength channels is provided. Further... | 02/23/2010 |
| 7424191 | System for measuring the wavelength dispersion and nonlinear coefficient of an optical fiber A method of simultaneously specifying the wavelength dispersion and nonlinear coefficient of an optical fiber. Pulsed probe light and pulsed pump light are first caused to enter an optical fiber to be measured. Then, the power oscillation of the back-scattered light... | 09/09/2008 |
| 7418212 | Electrical detection of optical symbols A system and method for detecting digital symbols carried in a received optical signal. The system comprises a functional element operative to receive a stream of samples of an electrical signal derived from the received optical signal and to evaluate a non-linear f... | 08/26/2008 |
| 7418206 | Control method of wavelength dispersion compensator, and wavelength dispersion compensator It is an object of the present invention to provide a control technique for reducing wavelength dependence of wavelength dispersion values and also for suppressing a change in wavelength transmission characteristic with a temperature variation or the like, in a VIPA... | 08/26/2008 |
| 7389049 | Chromatic dispersion compensation controlling system The dispersion monitoring device of the present invention detects a change in dispersion caused in a system by performing the decision process of a received signal using a data flip-flop in which required decision phase and decision threshold are set, averaging the ... | 06/17/2008 |
| 7382979 | Wavelength dispersion compensation design method and a system thereof The present invention discloses a design method of wavelength dispersion compensation of a desired link that is extracted from an optical network, the link including two or more spans, and two or more nodes (N1, N4) that are equipped with an add/drop f... | 06/03/2008 |
| 7369777 | Method and apparatus for automatically adjusting the optical power directed to a dispersion compensating element A dispersion compensator is provided that includes an input port 102 for receiving a WDM optical signal and a dispersion compensating element 110 coupled to the input port for substantially compensating the WDM optical signal for dispersion that has ac... | 05/06/2008 |
| 7336899 | Method for determining the dispersion characteristics of minimum phase filters A method and apparatus for determining the dispersion characteristics of minimum phase filters using substantially only an amplitude response of a minimum phase filter under test includes fitting an amplitude spectrum of the minimum phase filter with a substantially... | 02/26/2008 |
| 7327669 | OFDM modem system A radio relay system (1) comprises a wireless camera (11) and a signal receiving relay station (12). The wireless camera (11) wirelessly transmits signals to the signal receiving relay station (12) by using the OFDM modulation meth... | 02/05/2008 |
| 7324758 | Optical dispersion monitoring apparatus and optical dispersion monitoring method, and optical transmission system using same An optical dispersion monitoring apparatus and an optical dispersion monitoring method are capable of monitoring dispersion accurately with a simple construction in an optical transmission system using the same. To this end, the optical dispersion monitoring apparat... | 01/29/2008 |
| 7321728 | Optical waveform for use in a DWDM optical network and systems for generating and processing same An optical signal occupying one or more wavelengths. An optical data signal on each wavelength is modulated with a respective overhead (dither) signal, resulting in a respective dithered optical signal. The amplitude of a particular overhead signal used to modulate ... | 01/22/2008 |
| 7305183 | Measurement of polarization dependent loss in an optical transmission system A method and system enables measurement of polarization dependent loss (PDL) in an optical communications system including a plurality of cascaded optical components. An optical signal having a predetermined initial polarization state is launched into the optical co... | 12/04/2007 |
| 7302188 | Disperse equalizer and disperse equalizing method If no alarm is input from an optical receiver, an FEC decoder, or a client signal monitor, a control circuit controls a variable dispersion equalizer such that a transmission error becomes smaller using information on the number of error corrections obtained from th... | 11/27/2007 |
| 7295781 | Polarization mode dispersion compensation Methods and systems for PMD compensation in an optical communication system are implemented by transmitting multiple optical signals through a common optical conduit to an optical compensator that adjustably rotates the polarization states of the multiple optical si... | 11/13/2007 |
| 7286757 | Optical performance monitoring device A wavelength beam splitter (WBS) is combined with a conventional tunable filter to sequentially select different channels in a multi-channel communication system. The WBS is characterized by a periodic spectral response with period equal to the channel spacing of th... | 10/23/2007 |
| 7272327 | Multi-detector detection of optical signals Use in an optical communications system of multiple detectors to separately detect respective multiple spectral modes of a received optical signal. The invention also provides for corresponding multi-channel, dispersion-tolerant optical receivers. Embodiments are pr... | 09/18/2007 |
| 7272308 | Method of WDM channel tagging and monitoring, and apparatus Provided is an optical apparatus and method wherein power transfer coefficients arising from SRS are measured at a designated co-location point and the power of dithers, which are impressed on the channels of a multiplexed optical signal propagating through the opti... | 09/18/2007 |
| 7256876 | Estimating optical transmission system penalties induced by polarization mode dispersion (PMD) Polarization mode dispersion (PMD) induced system penalty ε is determined from optical characteristics of an optical wavelength division multiplexed (WDM) signal that is carried on a network. The method involves tapping the optical WDM signal, separating an optical... | 08/14/2007 |
| 7233739 | Optical bit stream reader system An all optical fiber bit stream reader system for examining the data contents of an optical fiber involving the conversion of a temporal timing signal into a spatially located signal is provided. The invention generally comprises generating and detecting a signal in... | 06/19/2007 |
| 7233962 | Optical error simulation system There is disclosed a method and computer program product for estimating a measure of the quality of the received signal in a computer simulation of an optical transmission system, wherein the simulation includes additive optical noise generated by components within ... | 06/19/2007 |
| 7209654 | Optical transmission system A plurality of optical repeaters are provided on a transmission line between an optical transmitting station and an optical receiving station. A combined transmission line section is provided between optical repeaters. The combined transmission line section is compo... | 04/24/2007 |
| 7209665 | Control concept for a multistage polarization mode dispersion compensator An apparatus is provided for compensating for polarization mode dispersion which is caused during transmission of a light wave via an optical waveguide, to an optical communication network having such an apparatus, and a method for compensating for polarization mode... | 04/24/2007 |
| 7203428 | Method and apparatus for polarization mode dispersion monitoring in a multiple wavelength optical system The invention relates to the monitoring of polarization mode dispersion (PMD) using heterodyne detection for providing PMD compensation in optical networks, and an apparatus for monitoring PMD. In the present invention, a broadband PMD monitor is disclosed based on ... | 04/10/2007 |
| 7197242 | Chromatic-dispersion measuring apparatus and method The present invention provides a chromatic-dispersion measuring apparatus and method that can quickly measure chromatic dispersion in an optical fiber even when the optical fiber is short. Continuous light beams having the wavelengths λ1 and λ2 | 03/27/2007 |
| 7197243 | Optical waveform for use in a DWDM optical network and systems for generating and processing same An optical signal occupying one or more wavelengths. An optical data signal on each wavelength is modulated with a respective overhead (dither) signal, resulting in a respective dithered optical signal. The amplitude of a particular overhead signal used to modulate ... | 03/27/2007 |
| 7174107 | Method and apparatus for measuring frequency-resolved states of polarization of a working optical channel using polarization-scrambled heterodyning An apparatus for measuring a set of frequency-resolved states of polarization (SOP) of an optical signal includes a local oscillator (LO), a polarization scrambler, a coupler for mixing the polarization-scrambled signal with the optical signal to produce a heterodyn... | 02/06/2007 |
| 7174098 | Apparatus and method for monitoring optical signal This invention provides a technique for realizing low-cost optical signal waveform monitoring with improved realtimeness to be applied to signal quality monitoring in an actual optical transmission system, and a technique for stably controlling an optical transmitte... | 02/06/2007 |
| 7162162 | Method and apparatus of clock recovery using optical filters A method and apparatus for optical clock recovery using optical filters with fixed reflective wavelengths is provided. In the apparatus, a first filter receives an optical signal and extracts one out of two spectral lines corresponding to two side peaks that are sec... | 01/09/2007 |
| 7162154 | System and method for dispersion detection According to the system and method of the present invention, the frequency of an optical data signal is modulated on the transmitter side, and group transit time changes of the optical signal are detected on the receiver side. These group transit time changes are pr... | 01/09/2007 |
| 7146085 | Method and system for measuring the wavelength dispersion and nonlinear coefficient of an optical fiber, method of manufacturing optical fibers, method of measuring wavelength-dispersion distribution, method of compensating for measurement errors, and method of specifying conditions of measurement A method of simultaneously specifying the wavelength dispersion and nonlinear coefficient of an optical fiber. Pulsed probe light and pulsed pump light are first caused to enter an optical fiber to be measured. Then, the power oscillation of the back-scattered light... | 12/05/2006 |
| 7139478 | Nonlinear device comprising a spectrally broadening fiber Embodiments of the invention include system for monitoring the effectiveness of pulse shaping in a nonlinear optical fiber (40). The spectral content of the pulse, after passing through the nonlinear fiber (40), provides an indication of how effectivel... | 11/21/2006 |
| 7130496 | Optical fibre backscatter polarimetry A method of and apparatus for determining the spatial distribution of polarisation properties of an optical fiber (1). Pulses (7) of light are transmitted along the optical fiber (1) and the polarisation state of light backscattered from portion... | 10/31/2006 |
| 7113709 | Redundant WDM transmission system optical receiver with reduced variable optical attenuators and/or variable dispersion compensation modules An optical receiver including a variable optical attenuator for controlling an optical loss value for each optical transmission line based on a predetermined optical loss value; a variable dispersion compensation module for controlling a wavelength dispersion value ... | 09/26/2006 |
| 7110682 | Method and apparatus for maintaining a pre-determined ratio of a pilot tone power and a mean optical output power of an optical signal Methods and apparatus for maintaining a pre-determined ratio of a pilot tone power and a total mean optical power of an optical signal are provided. One apparatus includes an optical source coupled to provide an optical signal in response to a DC bias and an AC bias... | 09/19/2006 |
