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7627256 |
Method and system for wavelength division multiplexed optical signal transmission and optical repeater
A wavelength division multiplexed optical signal transmission method, a wavelength division multiplexed optical signal transmission system and an optical repeater enabling the number of wavelengths...
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7593640 |
Method of dynamically controlling an optical module
A method of dynamically adjusting an optical module in an optical system including a plurality of transmission channels includes the following steps: measuring the quality of the optical signal at...
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7593644 |
Synchronization of lasers and RF sources using timing information transfer in the optical domain
A RF-synchronization system includes a laser that creates pulse trains for synchronization. A modulation means transfers the timing information of the pulse train into an amplitude modulation of an...
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7590358 |
Optical regenerative amplifier for binary phase shift-keying signals
There is provided an optical regenerative amplifier for regenerative amplification of a binary phase shift-keying (BPSK) sequence of optical signals having a predetermined time slot between any...
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7574140 |
Optical transmission system including repeatered and unrepeatered segments
A communication system including a repeatered trunk path and one or more unrepeatered branch segments coupled to the trunk path through associated submarine branching units. Each of the branch...
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7551857 |
Optical transmission system
An optical amplifier may be quickly returned from a shutdown state to a regular state after getting recovery information of a fault. Gain setting by ASE is conducted to the repeaters on the...
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7518120 |
Long-distance quantum communication and scalable quantum computation
Methods and apparatus for long-distance quantum communication and scalable quantum computation are disclosed. The methods and apparatus are based on probabilistic ion-photon mapping. Scalable...
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7505690 |
Multi-channel all-optical signal processor
An all-optical processor and method for simultaneous 2R regeneration of the multiple wavelength-division-multiplexed (WDM) channels comprising: a nonlinear medium, wherein the nonlinear medium...
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7486896 |
Optical clock recovery
The invention relates to clock recovery in optical communication systems. Optical clock frequencies are recovered from a plurality of optical channels by using a single optical resonator. The...
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7486893 |
Dynamic optical interconnect system reference signal formation
The disclosed technology provides a dynamic interconnection system which allows to couple a pair of optical beams carrying modulation information. In accordance with the disclosed technology, two...
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7454138 |
Method for optimizing path of optical network, and optical transmission node for realizing path optimization
Span information (information about conditions of a path between a node of interest and another, adjacent node connected thereto) retained in respective nodes is cumulatively transmitted from a...
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7444078 |
Transient control solution for optical networks
An optically amplified wavelength division multiplexing network has the functionality to add/drop channels at the optical add/drop multiplexing (OADM) nodes. The OADM node includes a receiver...
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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 (λ 1 ) from an incoming wavelength-multiplexed light signal. An...
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7421203 |
Method for transmitting packet in wireless access network based on wavelength identification code scheme
A method for transmitting a packet in a wireless access network based on a wavelength identification code scheme. The method comprises the steps of connecting n number of RNCs (Radio Network...
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7421207 |
Single fiber duplex optical transport
The invention pertains to optical fiber transmission systems, and is particularly relevant to optical transport systems employing optical amplifiers. In particular the invention teaches an...
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7394995 |
System and method for a compact optical receiver with wide dynamic range
An optical receiver is disclosed comprising an erbium-doped fiber amplifier (EDFA) that is coupled to a photodiode and transimpedance amplifier without filtering output light signal in the EDFA....
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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...
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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...
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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...
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7315696 |
Gain setting method in wavelength division multiplex transmission equipment
Gain setting of a receiving amplifier, is performed by detecting the necessity of gain setting when a receiving amplifier is turned on, requesting WDM transmission equipment in a preceding station...
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7302183 |
Gain tilt compensators and their systems
In the variable gain compensating apparatus, input power of optical amplifiers employed in respective optical repeaters is monitored, and the monitored input power is transferred to a down-stream...
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7295782 |
Control method and optical data transmission path for compensating changes in SRS-induced power exchange
Control method and optical data transmission path having a device for determining the tilting of the spectrum, and having a quick control and slow control for compensating the tilting of the spectrum.
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7263292 |
Methods and apparatus for controlling multiple infrared devices
A method and apparatus for controlling a plurality of infrared devices (ICDs) is provided herein. A remote controller is used to generate an optical signal for controlling a plurality of ICDs. The...
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7263296 |
Optical transmission system using in-line amplifiers
In a system connecting a transmitter and a receiver using transmission paths and repeaters (in-line amplifiers), red chirping whose α parameter is performed for an optical signal on a transmitting...
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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...
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7233744 |
Power feed arrangement using aggregate segments
A power feed arrangement for aggregate segments of a communications system is disclosed. In embodiments of the invention, cables are used to communicatively connect a number of landmasses, where...
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7209663 |
Apparatus and method for repeating signal by using wireless optical transmission
A repeating apparatus and method using wireless optical transmission is disclosed. The repeating apparatus includes a donor device for transmitting two identical copies of an optical signal by...
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7174108 |
Transmission device and repeater
A transmission system is provided that recognizes occurrence of a fault efficiently so that the workability and quality of service can be improved. An optical amplifier part amplifies an optical...
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7158728 |
Optical repeating system and optical amplifying repeater control method
An optical repeating system includes an optical transmitter and a plurality of optical amplifying repeaters. The optical transmitter specifies a part or all of the optical amplifying repeaters, and...
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7133611 |
Main signal controlling apparatus and method in a WDM optical communications system
If a repeater supervisory control (SV), a pre-emphasis automatic adjustment (PE), a receiving side threshold value automatic adjustment (Vth), a transmitting side dispersion compensation value...
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7130544 |
Optical repeating system and optical amplifying repeater control method
An optical repeating system includes an optical transmitter and an optical amplifying repeater. The optical transmitter transmits a supervisory command and a control command to the optical...
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7120362 |
High power repeaters for Raman amplified, wave division multiplexed optical communication systems
High power repeaters for use in amplifying optical data signals transmitted through undersea fiber optic cables are disclosed. Raman amplification schemes using 100 or more pump lasers are...
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7103276 |
Optical band scanning monitor system and method
A scanning optical monitoring system and method are appropriate for high speed scanning of a WDM signal band. The system and method are able to identify dropped channels or, more generally,...
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7103275 |
Optical transmission system
An optical transmission system capable of monitoring the operating status of Raman-amplifier repeaters even when an optical transmission line is partly disrupted by a fiber failure. An end station...
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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...
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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...
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7099595 |
Optical wavelength multiplexing transmission apparatus and optical output control method for optical wavelength multiplexing transmission apparatus
The present invention provides an optical wavelength multiplexing transmission apparatus and an optical output control method for an optical wavelength multiplexing transmission apparatus in an...
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7092630 |
Open fiber control for optical transceivers
The present invention implements open fiber control in an optical transceiver. During normal operation, the transceiver transmits signals through a connection to an optical network. When the...
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7079779 |
Repeater apparatus, communication equipment, communication system thereof and repeating method
A repeater apparatus ( 1001 ) is constituted from infrared transmitter sections ( 1 s, 2 s, 3 s ) and infrared receiver sections ( 1 r, 2 r, 3 r ) as well as connection control sections ( 1 C, ...
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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,...
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7068945 |
Optical amplifying and repeating method and optical amplifying and repeating system
A method includes taking backscattering light of a first wavelength in a first direction of a first transmission line and coupling the same so that the light may travel in a second direction of a...
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7058305 |
Optical submarine communication system and surge suppressing apparatus of the optical submarine communication system
An optical submarine communication system has a land cable connected to a terminal apparatus which is installed on land near the seashore for transmitting an optical signal and electric power. The...
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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...
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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...
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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...
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7016614 |
Optical wavelength division multiplexing transmission suppressing four-wave mixing and SPM-GVD effects
An optical repeater is provided between a first optical fiber transmission path and a second optical fiber transmission path having a zero-dispersion wavelength different from the first optical...
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7010235 |
Method and system for all-optical signal regeneration
A system for all-optical signal regeneration is provided, which makes it possible to exhibit desired intensity noise suppressing function with respect to pulsed input signal light without...
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7010234 |
All-optical regenerator for retiming, reshaping and retransmitting an optical signal
An all-optical 3R regenerator (AO3R) and a method for using the AO3R to retime, reshape and retransmit an optical signal are described herein. The AO3R includes a polarizer that receives an input...
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6980745 |
Optical transmission system
An optical transmission system ensuring high-quality monitor control even if an optical fiber fault occurs. A monitor instruction sending unit sends a monitor instruction. An operating condition...
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6956693 |
Optical repeater having independently controllable amplification factors
An optical repeater includes: a first forward pumping coupler and a first backward pumping coupler inserted in an uplink optical fiber consecutively along the transfer direction of the optical...
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