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| Number | Title | Issue Date |
| 8190032 | Optical signal processing apparatus An O/E conversion element converts an input NRZ optical signal into an electric signal. A clock recovery circuit recovers a clock signal from the electric signal obtained by the O/E conversion element. A phase modulator applies phase modulation to the NRZ optical si... | 05/29/2012 |
| 8184987 | Method, system and device for realizing data transmission extension in passive optical network A method, a device, and a system for realizing data transmission extension in a passive optical network (PON) are provided. Between a burst-mode clock and data recovery (BCDR) module and an electrical-optical (E/O) amplification module, the device includes a delimit... | 05/22/2012 |
| 7783202 | All-optical methods and systems An all-optical modulation format converter for converting optical data signals modulated in an on-off-keying (OOK) format to a phase-shift-keying (PSK) format. The OOK-to-PSK converter can be coupled to a delay-line interferometer to provide an all-optical wavelengt... | 08/24/2010 |
| 7725041 | All-optical intensity to DPSK converter An all-optical converter (10) for converting an intensity-modulated optical signal into an optical signal modulated to the DPSK format, includes a first input (152a) for a first intensity-modulated optical signal (12), a differential enco... | 05/25/2010 |
| 7639953 | Compact systems for generating polarization-entangled photons Various embodiments of the present invention are directed to compact systems for generating polarization-entangled photons. In one embodiment of the present invention, a non-degenerate, polarization-entangled photon source comprises a half-wave plate that outputs bo... | 12/29/2009 |
| 7558486 | All-optical methods and systems An all-optical modulation format converter for converting optical data signals modulated in an on-off-keying (OOK) format to a phase-shift-keying (PSK) format. The OOK-to-PSK converter can be coupled to a delay-line interferometer to provide an all-optical wavelengt... | 07/07/2009 |
| 7522843 | Optical repeater converting wavelength and bit rate between networks An optical repeater which includes a wavelength converter and a bit rate converter. The wavelength converter converts a wavelength of an optical signal from a first optical network to a wavelength of a second optical network. The bit rate converter converts a bit ra... | 04/21/2009 |
| 7437070 | Submarine observation apparatus and submarine observation system In each of a plurality of submarine observation apparatus (1 to n), a branching unit (63) branches fixed-wavelength light (λ1) from an incoming wavelength-multiplexed light signal. An observation signal modulating unit (64) modulates the... | 10/14/2008 |
| 7437083 | Wavelength converter A wavelength converter for binary optical signals includes an interferometer structure (110) for generating an output signal by modulating a received local signal (LS) according to the modulation of a fUrther received first input signal (IS 1). When su... | 10/14/2008 |
| 7424227 | Optical repeater converting wavelength and bit rate between networks An optical repeater which includes a wavelength converter and a bit rate converter. The wavelength converter converts a wavelength of an optical signal from a first optical network to a wavelength of a second optical network. The bit rate converter converts a bit ra... | 09/09/2008 |
| 7379677 | Method of wavelength conversion and wavelength converter The wavelength converter comprises (1) an optical multiplexer for multiplexing an amplitude-modulated first light and reference light, which is continuous light having a wavelength different from the wavelength of the first light, (2) an optical fiber for propagatin... | 05/27/2008 |
| 7376354 | All optical clock recovery All optical clock recovery includes a transmitter for generating an optical timing signal. The transmitter includes a semiconductor laser for the production of a dynamically synchronizable timing signal, the laser having an external resonator for feedback of the tim... | 05/20/2008 |
| 7369779 | Regeneration of optical phase modulated signals A regenerator for restoring the originally encoded optical phase of a differential-phase-shift-keyed signal. In an embodiment, the regenerator simultaneously provides limiting amplification and reduces amplitude noise based on a phase-sensitive optical amplifier tha... | 05/06/2008 |
| 7356263 | Signal processor for converting signal Provided is a signal processor for converting a signal that converts a return to zero (RZ) signal into a non-return to zero (NRZ) signal, in which two 2R (re-amplifying, re-shaping) regenerators are connected in parallel between an input waveguide and an output wave... | 04/08/2008 |
| 7330662 | System and method for remote optical digital networking of computing devices The extended range of optical data communication is enabled through the use of intermediary relay stations spaced fairly far apart. IRDA communicatiOn, as is well known, uses very short duration optical pulses to send data up to 1 Mbit/sec; this has the concomitant ... | 02/12/2008 |
| 7310482 | Optical wavelength conversion for phase-modulated optical signals An optical communication system comprises a first optical interface, an optical processing system, and a second optical interface. The first optical interface receives an optical signal that is phase-modulated and has a first wavelength. The optical processing syste... | 12/18/2007 |
| 7260331 | Optical pulse demultiplexer and method thereof To demultiplex a low-speed optical pulse signal from a high-speed optical pulse signal, an optical clock generator generates an optical clock of a control wavelength λp at a predetermined frequency out of a pulse signal light of a signal wavelength λs. On one side... | 08/21/2007 |
| 7212739 | Protection switching arrangement for an optical switching system A protection arrangement for an optical switching system includes protection switching for switch planes in the optical core and for ports in the tributary cards. For a multiple layer switch core protection is also provided between layers. A first layer is for switc... | 05/01/2007 |
| 7203427 | Redundant path all-optical regeneration, reshaping and wavelength conversion for enhanced yield A system, method and device for AO2R is presented. The AO2R system presented is redundant, containing multiple pathways for the input and output signals to travel. The system carries out both the regeneration and reshaping functions in the optical domain, and return... | 04/10/2007 |
| 7200344 | Receiver and method for a multichannel optical communication system A method and system for transmitting information in a wavelength division multiplex (WDM) or other suitable multichannel optical communication system includes receiving a multichannel signal having a symbol rate and comprising a plurality of non-intensity modulated ... | 04/03/2007 |
| 7139490 | All-optical wavelength converter circuit A method and apparatus for transferring information of an optical information-bearing signal from a first wavelength to a second wavelength. The method is implemented in an all-optical wavelength converter circuit which includes a laser diode in communication with a... | 11/21/2006 |
| 7116915 | Optical signal generating circuit and optical transmission line An optical transmission line allows optical signals to be transmitted with higher stability over longer distances. According to a first aspect, an optical NRZ signal is split in two, one half is presented to a clock extraction circuit, and the other half is presente... | 10/03/2006 |
| 7113707 | Dynamic optical interconnect This invention provides a dynamic interconnection system which allows to couple a pair of optical beams carrying modulation information. In accordance with this invention, two optical beams emanate from transceivers at two different locations. Each beam may not see ... | 09/26/2006 |
| 7106975 | Optical signal processing system There are provided a first optical transmitting device for transmitting a first light having a first wavelength in a continuous light state and a second light having signal optical pulses and a second wavelength, a first optical amplifier for receiving the first lig... | 09/12/2006 |
| 7103287 | Method for remodulating an optical stream with independent data A method and apparatus for remodulating an optical data stream such that a second modulated data stream is optically transported along with a first modulated data stream. In one embodiment, an optical signal having modulated thereon a first data stream is split into... | 09/05/2006 |
| 7103282 | All optical clock recovery All optical clock recovery includes a transmitter for generating an optical timing signal. The transmitter includes a semiconductor laser for the production of a dynamically synchronizable timing signal, the laser having an external resonator for feedback of the tim... | 09/05/2006 |
| 7099594 | Optical transmission using all-optical regeneration and dispersion techniques The present invention generally provides optical signal transmission system having an optical signal source, at least one optical signal regenerator in series communication with the optical signal source via an optical signal communications medium, a dispersion modu... | 08/29/2006 |
| 7099586 | Reconfigurable multi-channel all-optical regenerators An all-optical regenerating circuit including a wavelength converter based on a Mach-Zehnder interferometer. The input signal is amplified and the interferometer adjusted to place the input signal across an entire monotonic portion of a sinusoidal transfer function ... | 08/29/2006 |
| 7099587 | Apparatus and method for delaying optical signals for optical buffering and optical storage applications A delayed optical signal is generated from an inputted optical signal by cyclically transmitting the inputted optical signal between at least two ends of an optical medium and outputting the inputted optical signal from one of the ends of the optical medium after at... | 08/29/2006 |
| 7079779 | Repeater apparatus, communication equipment, communication system thereof and repeating method A repeater apparatus (1001) is constituted from infrared transmitter sections (1s, 2s, 3s) and infrared receiver sections (1r, 2r, 3r) as well as connection control sections (... | 07/18/2006 |
| 7062167 | Optical transmission system, monitoring method therefor, optical communication apparatus, and optical external conducting apparatus To provide an optical transmission system that enables monitoring of communication data to be performed without interrupting operation. Optical signals to be transmitted by an optical communication apparatus and optical signals received by the optical communication ... | 06/13/2006 |
| 7043164 | Optical regenerator for high bit-rate OTDM signals An optical regenerator suitable for use with optical signals has two stages. An incoming optical signal to be regenerated passes first through a data division stage. This divides the optical data stream into a number of data streams at a bit rate lower than the orig... | 05/09/2006 |
| 7031617 | Method and system for optical wavelength conversion and regeneration An on/off switchable source of a continuous optical signal at a respective wavelength (λ2) is provided to be turned off when the wavelength (λ1) of the modulated incoming signal corresponds to the respective wavelength (λ2) genera... | 04/18/2006 |
| 7027741 | Phase lock loop circuit and optical repeating apparatus, optical terminal apparatus, and optical communication system having the same According to a PLL circuit of the present invention, an output of a phase comparator is adjusted according to a space-to-mark transition-probability of an input signal so that an output of a voltage controlled oscillator has a predetermined frequency and phase. Ther... | 04/11/2006 |
| 7020401 | Transponder and wavelength division-multiplexing optical transmission equipment A wavelength converter and a wavelength division-multiplexing optical communication apparatus automatically generate clock signals of a specified frequency that match send/receive digital signals and regenerates timing for the send/receive digital signals. The wavel... | 03/28/2006 |
| 7006772 | Method and apparatus for transmitting high-frequency signals in optical communication system A method for transmitting high-frequency signals in an optical communication system includes combining an optical signal, the first optical local component from a local light source and the second optical local component from the local light source having a predeter... | 02/28/2006 |
| 6999677 | Protection switching arrangement for an optical switching system A protection arrangement for an optical switching system includes protection switching for switch planes in the optical core and for ports in the tributary cards. For a multiple layer switch core protection is also provided between layers. A first layer is for switc... | 02/14/2006 |
| 6963675 | Device and system for phase conjugate conversion and wavelength conversion The device according to the present invention relates to phase conjugate conversion and wavelength conversion. This device includes a polarization beam splitter and a polarization maintaining fiber (PMF). The polarization beam splitter has first, second, and third p... | 11/08/2005 |
| 6950612 | Optical signal generating circuit and optical transmission line An optical transmission line allows optical signals to be transmitted with higher stability over longer distances. According to a first aspect, an optical NRZ signal is split in two, one half is presented to a clock extraction circuit, and the other half is presente... | 09/27/2005 |
| 6931212 | 3R optical signal regeneration A method and apparatus for providing optical 3R regeneration involving: 1) generating an encoded optical clock signal from at least an optical signal; 2) introducing the encoded clock signal into a delay interference section of a regenerator such that an amplitude m... | 08/16/2005 |
