Matches 151 - 200 out of 375 < 1 2 3 4 5 6 7 8 >
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6483624 Optical pulse generation system for generating optical pulses having high duty ratio  
An optical pulse generator includes a single-wavelength light source, an electroabsorption optical modulator, a sine-wave voltage generator, a nonlinear circuit, and a DC voltage source. The...
6476948 Accurate synchronizing device  
A synchronization device which synchronizes signals transmitted from a transmitter to receivers. The transmitter includes a generator for generating a synchronization signal having a recurrence...
6473719 Method and apparatus for selectively controlling the quantum state probability distribution of entangled quantum objects  
A method and system are disclosed for controlling the quantum state probability distribution of one quantum object of a pair of entangled quantum objects, which include providing a pair of...
6469634 Method and apparatus for controlling the operation of electronic entertainment devices in an entertainment system  
A method and apparatus for controlling the operation of electronic entertainment devices in an entertainment system is described herein. A hardware system is coupled to a plurality of electronic...
6466347 Binary optical transmission system  
Disclosed is a binary optical transmission system for transmitting and receiving a target transmit data to be transmitted as a binary optical transmit data composed of luminous part and...
6438148 Method and device for encoding data into high speed optical train  
A device for encoding data into high speed optical train includes N data encoding branches, each having a dual-mode laser, generating at the beat frequency f, and an external modulator. Each dual...
6424443 Optical signal resynchronization method and device  
To resynchronize input optical signals with different optical carrier frequencies f 1 , f 2 a delayed optical signal is created by applying a variable time-delay to one of the signals. A...
6396607 Multi-wavelength all-optical regenerators (MARS)  
In an optical regenerator for use in an optical transmission system, an optical input signal to the regenerator comprising N wavelength division multiplexed channel signals is received in a signal...
6373608 Method and device for on-line regeneration of a signal transmitted by wavelength division multiplexed solitons and optical telecommunication system comprising such a regenerating device  
The invention enables wavelength division multiplexed (WDM) solitons conveyed by an optical fiber to be regenerated synchronously. The invention consists in using optical delay lines, in particular...
6373911 Bit synchronization circuit  
A bit synchronization circuit operates at high speed range as high as Gb/s or higher and can establish synchronization within 10 bits with rejecting jitter to permit accurate bit synchronization....
6366381 Remote monitoring of an optical transmission system using line monitoring signals  
An optical transmission system allows for the remote determination of the output power of each carrier for each repeater. The optical transmission system includes two terminals, an optical path...
6366374 AC performance monitor with no clock recovery  
Apparatus and method for monitoring an optical signal using a locally generated clock signal instead of a clock signal recovered from the optical signal. Numerous eye diagrams are generated based...
6366372 Burst mode wavelength manager  
An optical network operating with burst mode data traffic signal comprises a recirculating optical loop memory which includes taking a sample of a burst mode data traffic signal and storing the...
6342962 Optical system for transmitting data in soliton format  
A system for transmitting signals in the form of soliton pulses over long distances using an optical conductor minimizes distortion of the transmitted soliton pulses using, in combination, a phase...
6335815 Optical receiver  
An optical receiver includes a light-receiving device, an equalizing amplifier, a regenerating circuit, a timing signal extraction circuit, a reference voltage generation circuit, and a comparator....
6333804 Optical module for receiving optical signal from optical fiber  
This optical module comprises a photodiode 1, a current mirror circuit 2 having two parallel lines, one of the lines being connected to the photodiode 1, and a transimpedance amplifier 3 connected...
6333801 Electronic equipment for optical communication capable of saving power  
An electronic equipment has a transmission/reception circuit for optical communication, and a CPU which is operated by programs and can be switched to either an operation mode or a standby mode...
6323979 Regenerator with optical modulation for optical fiber transmission systems using soliton signals  
The invention relates to a regenerator using optical phase modulation in an optical fiber transmission system using soliton signals. According to the invention, the soliton signal is modulated by a...
6313934 Chromatic dispersion measurement scheme for optical systems having remote access points  
A measurement scheme characterizes chromatic dispersion of an optical system having physically separated access points. A modulation signal at a local access point of the optical system and a...
6310709 Synchronous polarization and phase modulation using a periodic waveform with complex harmonics for improved performance of optical transmission systems  
A method and apparatus is provided that yields improved performance by modulating the optical phase and polarization of an optical signal with a periodic waveform having harmonic content that is...
6295152 Optical receiver for receiving digitally transmitted data  
An optical receiver for receiving digitally transmitted data, the receiver containing connected a digital filter 2 and a decision circuit 3 to it for detecting the incoming data signals 1, and a...
6292284 Light emitting element driving apparatus  
The present invention provides a light emitting element driving apparatus having a driving unit for driving a light emitting element by means of a driving signal while performing automatic light...
6271950 Optical differential phase shift keying transmission system having multiplexing, routing and add/replace capabilities  
A Differential Phase Shift Keying (DPSK) optical transmission system provides time division multiplexing, channel routing and channel add/replace functions. The DPSK transmitter comprises a laser...
6236485 Optical TDMA network  
An optical network carrying TDMA (time division multiple access) signals includes an optical bus (1) and nodes (RN, TN) which are connected to the optical bus. The optical bus includes at least two...
6222660 Adaptive power supply for avalanche photodiode  
An adaptive power supply for an avalanche photodiode (APD) is used to determine an optimum bias voltage. Without an optical signal input the adaptive power supply applies a swept voltage to the APD...
6215570 Optical switch  
Optical signals used for telecommunications in time division multiplexed format are processed to remove channels for local demodulation and to replace the removed channels with locally modulated...
6204949 Method and device for extracting a timing signal  
A method for extracting a timing signal produces a data signal from a first portion of an optical signal, extracts a timing signal from a second portion of the optical signal and adds dispersion...
6201621 Optical regeneration for optical-fiber transmission systems for non-soliton signals  
A method of regenerating non-soliton RZ optical signals, the method including the steps of: a compression step, whereby the RZ signals are compressed into soliton-type signals; a modulation step...
6201822 Optical signal transmission apparatus and optical signal transmission method  
A parallel optical signal transmission apparatus suppresses a power source noise, a drift, and timing jitter and drift caused by changes in temperature. The parallel optical signal transmission...
6198559 Automatic delay compensation for generating NRZ signals from RZ signals in communications networks  
The present invention is a method of automatic delay compensation for use in data transmission, particularly in optical communication systems. The invention presents an inter-coding, real-time...
6178023 Optical telecommunication method providing a transmitting and receiving service channel  
A digital optical telecommunication method including the steps of: generating a digital modulated optical signal in an optical transmitting station, which signal corresponds to a first electric...
6166839 Optical transmitting apparatus, optical receiving apparatus, and optical transmitting-receiving system  
An optical transmitting apparatus has an identification level output circuit which outputs identification level information which is required when a logical level of transmission data is determined...
6163394 Optical signal transmitter, system and method of transmission  
An optical signal transmitter (10) is constituted by a coherent light generator (12) for generating a carrier wavelength and a modulator apparatus (16, 32) coupled with the output of the light...
6151146 Method and apparatus for shaping a binary signal  
In order to re-synchronize and shape a binary signal of bit time T0, a method includes forming a number p of sampled signals obtained by causing the signal to modulate pulses that are of frequency...
6141357 Method and apparatus for controlling mobile receivers  
A user headset is provided that is operable to contain an audio device (50) and a receiver (52). The receiver (52) is operable to receive both audio information on multiple channels and also data....
6137610 Optical synchronization arrangement  
An optical synchronization circuit includes a non-linear optical modulator (NOM). The signal to be synchronized and a reference signal interact within the NOM. Cross-phase modulation produces a...
6134038 Optical signal for a soliton optical transmission system  
In a soliton transmission system, the invention proposes sending a signal constituted by a periodic series of solitons, each having a width lying in the range 0.20 times to 0.33 times the period of...
6108125 Optical regenerative repeater  
An input optical data pulse 120 encoded by pulse amplitude modulation is branched into two parts by an optical coupler 111, and one part is input to an optical clock generation device, such as...
6104515 Method and apparatus for providing high-order polarization mode dispersion compensation using temporal imaging  
A high-order polarization mode dispersion (PMD) compensation arrangement compensates for PMD in an optical signal using a temporal imaging technique. An optical data input signal to the PMD...
6091531 Differential charge and dump optoelectronic receiver  
A differential charge and dump optoelectronic receiver for baseband digital optoelectronic data links is disclosed having a preamplifier and a voltage controlled current source that defines the...
6057950 Synchronous polarization and phase modulation for improved performance of optical transmission systems  
A method and apparatus is provided for modulating the polarization of an optical signal. A polarization modulator receives an optical signal onto which data has been modulated at a predetermined...
6057949 Bi-directional infrared communications system  
An infrared (IR) transmitter modulator/receiver controller (TM/RC) encodes downlink serial digital data and precise time synchronization strobes from a host system to provide a downlink modulated...
6025946 Transmission device and transmission method  
The present invention relates to a transmission device and a transmission method which can efficiently perform transmission of audio signals with infrared ray and suppress the complication of data...
5999286 Method and system for restoring a distributed telecommunications network  
This invention includes a path-based method and system that restore a distributed telecommunications network (90) from a failure condition (92). First, the method and system notify all the network...
5999570 Transmission apparatus, sending apparatus, and receiving apparatus, and transmission method  
The transmitter QPSK-modulates the audio data, generates a transmission channel clock having a frequency 5/4 times the data clock based on the audio data, and outputs the modulated signal resulted...
5986786 Passenger conveyance vehicles and systems utilizing the same  
Described are novel passenger conveyance vehicles and passenger transit systems which are configured to transmit signals which, when properly received and converted, provide intelligible non-visual...
5978123 Method for the transmission of a low-rate supplementary channel in high-rate coherent optical transmission systems  
The invention relates to a method for the transmission of a low-rate supplementary channel 24 in high-rate coherent optical transmission systems for the transmission of supplemental data 26, in...
5953138 All-optical processing in communications systems  
An all-optical processing system coverts or interfaces optical signals from a wavelength division multiplexed (WDM) form to an optical time divisional multiplexed (OTDM) form. The initial WDM...
5946120 Wireless communication system with a hybrid optical and radio frequency signal  
A digital communication system for transmitting and receiving a hybrid optical and RF communication signal. The system includes a hybrid transmitter that incorporates an optical transmitter, an RF...
5940198 Optical unit for synchronizing clock signals  
The invention relates to an optical unit (17) for synchronizing clock signals. The unit (17) comprises at least two ring lasers (1', 1"), each ring laser (1', 1") generating a repetitive optical...
Matches 151 - 200 out of 375 < 1 2 3 4 5 6 7 8 >