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A method of swing on a swing is disclosed, in which a user positioned on a standard swing suspended by two chains from a substantially horizontal tree branch induces side to side motion by pulling alternately on one chain and then the other.
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| Number | Title | Issue Date |
| 8064768 | Intra-channel equalizing optical interleaver An apparatus includes an interleaver configuration for at least one of combining or separating odd and even channel groups to achieve channel density doubling; and an optical equalizer for suppressing inter symbol interference within the channels to provide intra-ch... | 11/22/2011 |
| 7379640 | Tunable dispersion compensator and method of manufacturing the same A tunable dispersion compensator in which a heater portion can be easily constructed to reduce cost. A tunable dispersion compensator includes: an optical fiber having a grating portion; a heating unit for heating the grating portion to apply a temperature distribut... | 05/27/2008 |
| 7263257 | Gires-Tournois etalons and dispersion compensation A first embodiment of the invention provides a Gires-Tournois etalon (DGTE) 20 comprising a cladding mode suppressed optical fibre 22, including an etalon section 24 in which a weakly reflective optical waveguide grating 26 and a strongly... | 08/28/2007 |
| 7245422 | Raman optical amplifier, optical transmission system using the same, and raman optical amplification method An amplification medium is inputted thereto first lights and second lights, polarizations of which are orthogonal. A pumping means inputs first pump lights coinciding with the polarization of the first lights, and second pump lights coinciding with the polarization ... | 07/17/2007 |
| 7239268 | Method and apparatus for minimizing the number of power amplifiers required under multiple transmission conditions The number of power amplifiers required to amplify a plurality of transmission signals is reduced by using non-linear transmission lines (NTL) circuits. In general, a “combining” NTL circuit is used to combine the plurality of transmission signals to form a soli... | 07/03/2007 |
| 7227681 | Controller which controls a variable optical attenuator to control the power level of a wavelength-multiplexed optical signal when the number of channels are varied An optical amplifier which amplifies a wavelength division multiplexed (WDM) optical signal having a variable number of channels associated with different wavelengths and outputs the amplified WDM optical signal. The optical amplifier includes (a) an optical attenua... | 06/05/2007 |
| 7187832 | Gap-soliton devices in photonic crystal fibers A gap-soliton structure is provided. The gap-soliton structure includes a cladding structure having alternating layers of different index values. A core region is interposed between the alternating layers of index values. The core or the cladding structure includes ... | 03/06/2007 |
| 7151880 | Dispersion-managed optical soliton transmission system A dispersion-managed optical soliton transmission system uses alternating spans of positive-dispersion optical fiber having a negative slope and negative-dispersion optical fiber having a positive slope. For wavelength division multiplexing, the system has a map str... | 12/19/2006 |
| 7146071 | Optical transmission system An optical transmission system which permits transmission distance to be prolonged without using repeaters and yet ensures economical, high-quality optical transmission. A branch station performs non-repeated communication with an optical branching point and include... | 12/05/2006 |
| 7130306 | Pulse group soliton transmission A soliton transmission method where groups of partially overlapping short pulses are sent as solitons. Such pulses are laser pulses or any other electromagnetic radiation pulses having a same wavelength. The pulses in the pulse groups can be modulated both individua... | 10/31/2006 |
| 7076174 | Method, device, and system for processing optical signal The present invention relates to a method for processing an optical signal is provided. An optical signal is input into an optical waveguide structure for providing a nonlinear effect. As a result, the optical signal undergoes chirping induced by the nonlinear effec... | 07/11/2006 |
| 7068943 | Devices and methods for dynamic dispersion compensation The present invention provides devices and methods for dynamic dispersion compensation. According to one embodiment of the invention, a dispersion compensating device includes a negative dispersion fiber having an input configured to receive the optical signal, the ... | 06/27/2006 |
| 7039324 | Method, device, and system for regenerating optical signal The present invention relates to a method for regenerating an optical signal suitable for WDM (wavelength division multiplexing). In this method, an optical signal is supplied to an optical waveguide structure (e.g., optical fiber) for providing a nonlinear effect. ... | 05/02/2006 |
| 7027684 | Wavelength selective switch A wavelength selective switch is realized by combining a quantized dispersion element and an array of switching means. The quantized dispersion element enables to concentrate all the wavelengths within predetermined wavelength bands onto the same location in the swi... | 04/11/2006 |
| 6980747 | Optically amplified receiver An integrated, optically amplified receiver includes an optically pumped optical preamplifier for receiving, generally, wavelength division multiplexed optical communication signal over an optical communications line. A PIN photodetector receives the optical communi... | 12/27/2005 |
| 6738581 | Network control system for optical communication networks A network control system may be embodied in various elements of a communication network which communicates optical signals multiplexed by wavelength division multiplexing (WDM). In a preferred embodiment of the invention, the network control system limits a number o... | 05/18/2004 |
| 6654152 | Frequency guiding filter for dispersion managed soliton transmission Wavelength locked feedback loops are provided in frequency guide filters, and particularly in sliding frequency guide filters, wherein the wavelength locked feedback loop allows precise control over the location of the filter center wavelength with respec... | 11/25/2003 |
| 6147788 | Guiding filters for wavelength division multiplexing in soliton transmission In soliton transmission, third order dispersion of the transmission fibers tends to cause unacceptable variation in the filter strength parameter, η over the wide wavelength bands required for massive wavelength division multiplexing (WDM). The effect of... | 11/14/2000 |
| 6011638 | Dispersion tapered optical fibers for use in WDM soliton transmission systems A dispersion-tapered fiber for use in a soliton transmission system having lumped amplifiers to substantially reduce loss associated with pseudo phase matching and to relax the limitations on minimum allowable channel spacing caused by cross-phase modulat... | 01/04/2000 |
| 5946117 | Optical soliton telecommunication system with dispersion-shifted optical fibre An optical telecommunication system has at least two sources of optical modulated signals at different wavelengths in a predetermined transmission wavelength band, together with a multiplexer for the signals, an optical fibre line connected at one end to ... | 08/31/1999 |
| 5892608 | Optical receiver device for dark soliton lightwave An optical transmitter which reverses the ON-OFF state of the optical intensity of a bright soliton lightwave and generates a dark soliton lightwave having an optical phase shift, an optical receiver for the dark soliton lightwave, and a superfast, high-c... | 04/06/1999 |
| 5801862 | Synchronous modulation method and apparatus for in-line regeneration of a WDM soliton signal, and an optical telecommunications systems using the method The object of the invention enables wavelength division multiplexed solitons conveyed by an optical fiber to be regenerated synchronously. The method uses clock recovery from the WDM signal, and synchronous modulation of the solitons at the clock rate rec... | 09/01/1998 |
| 5767998 | Wavelength-division multiplexed communication system utilizing optical solitons In a wavelength-division multiplexed communication system utilizing optical solitons in which optical amplifiers are inserted into an optical fiber at predetermined intervals so as to compensate for loss in the fiber, the group-velocity dispersion of the ... | 06/16/1998 |
| 5726787 | Apparatus and method for improving signal-to-noise ratio in wavelength division multiplexing soliton transmission systems For use in a soliton optical pulse transmission system, an apparatus for, and method of, increasing a signal-to-noise ratio of the system. The apparatus includes: (1) a component for receiving a soliton and an accompanying background noise from the system... | 03/10/1998 |
| 5710649 | Apparatus and methods for nulling non-random timing jitter in the transmission of digital optical signals A clock recovery circuit for following rapid changes in the time phase of a data stream is disclosed. The circuit comprises a low Q resonator coupled to a detection device, such as an electro-optic modulator in a time division demultiplexer or a decision ... | 01/20/1998 |
| 5703706 | Spectral modification through phase modulation with spatial extent An optical pulse propogating in an optical guide of an electro-optic medium interacts with a coplanar RF traveling wave to shift the optical wavelength. The RF phase is resynchronized to the optical pulse phase with spatial periodicity to provide a desire... | 12/30/1997 |
| 5357364 | Soliton transmission system having sliding-frequency guiding filters Timing jitter problems are effectively eliminated in a soliton transmission system realized in accordance with the principles of the present invention by deploying optical filters whose center frequency intentionally differs from the center frequency of a... | 10/18/1994 |
| 5111322 | Polarization multiplexing device with solitons and method using same The single-wavelength bit-rate capacity of an ultra long distance soliton transmission system is increased by using a combination of polarization and time-division multiplexing. More specifically, two streams of differently (preferably orthogonally) polar... | 05/05/1992 |
| 5035481 | Long distance soliton lightwave communication system Long distance soliton lightwave communications systems are considered for next generation application in terrestrial and transoceanic environments. These systems employ a chain of lumped fiber amplifiers interconnected by long spans of dispersion shifted ... | 07/30/1991 |
| 4700339 | Wavelength division multiplexed soliton optical fiber telecommunication system The propagation speed of optical solitons in single mode optical fiber depends on the wavelength of the solitons. Thus, if solitons of different wavelengths are co-propagating, "collisions" between pulses can be expected to result. It has been found that ... | 10/13/1987 |
