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7620317 Programmable loss of signal detect hardware and method  
A loss of signal assert and de-assert level programming mechanism in an optical transceiver coupled to a host computing system. A control module is connected to the host so as to receive the...
7620329 Laser power control with automatic compensation  
A method and apparatus is disclosed for optic signal power control to maintain a desired or optimum optic signal power level. During start-up, a default or target value from memory may be utilized...
7613400 Multi-level optical data communication circuit  
A driver circuit is coupled to an optical waveguide transmitter. The driver circuit has a current generator that is in series with the transmitter, and a current robbing circuit is coupled to the...
7596325 Method and apparatus for pulse-amplitude equalization of rational harmonic mode-locked optical signal  
A method and an apparatus for pulse-amplitude equalization of rational harmonic mode-locked optical pulses provides modulation voltages greater than a switching voltage of a dual-electorde...
7596320 Preemphasis of an optical wavelength multiplex signal  
Methods are described for preemphasizing an optical multiplex signal that comprises a plurality of signals having different wavelengths, which are transmitted by a transmitter to a receiver. Power...
7593647 Apparatuses and methods for automatic wavelength locking of an optical transmitter to the wavelength of an injected incoherent light signal  
An optical transmitter has a resonance wavelength characteristic that varies with the refractive index of the optical transmitter. The optical transmitter receives a narrow band injected wavelength...
7590351 Extinction ratio control using a frequency spread tone to modulate optical signal power levels  
An optical transmitter that controls the extinction ratio by modulating a power level of an optical signal using a frequency spread tone. An electro-optic transducer driver generates an electrical...
7580630 Spectral shaping for optical OFDM transmission  
A transmitter for an optical transmission system transmits an optical sub carrier multiplexed signal comprising number of sub-carriers, onto an optical transmission path, and provides spectral...
7561806 Method and system for keeping timing alignment between driving signals in optical double modulation  
A method and system is disclosed for making timing alignment for a data transmission system, the method comprising providing a reference clock signal with a first frequency to a multiplexer through...
7561809 Modulated laser with integral pre-distortion circuit  
An integrated laser device includes a pre-distortion circuit. The pre-distortion circuit receives an electrical modulation signal and generates a pre-distorted modulation signal. A laser is...
7555226 Automatic bias control for an optical modulator  
An automatic bias controller for an optical modulator is provided. The automatic bias controller comprises a driver for providing an electrical data signal to the modulator and a bias voltage...
7539423 Loss of signal detection and programmable behavior after error detection  
A method for a fiber optic device to conserve power includes turning off components in the fiber optic device and turning them back on when a detection signal is at a specified level. A method for...
7532823 Light emitting diode driving circuit and optical transmitter for use in optical fiber link  
An LED driving circuit includes: (a) a current mirror circuit having N-channel MOS transistors whose respective gates are connected with each other, (b) a constant current source for supplying an...
7526201 Optical fiber transmission system with noise loading  
A system and method for loading unutilized channels of a WDM system with noise to improve system performance. A transmitter amplifier may impart noise to unutilized channels by reducing amplifier...
7522846 Transmission power optimization apparatus and method  
A method and system is provided that is capable of controlling transmit power to achieve a desired OSNR at a receive endpoint. The system utilizes the fact that the aggregate power for a plurality...
7522845 WDM laser wavelength control  
A transmitter ( 11 ) emits a single wavelength optical signal and transmits this as a wavelength channel ( 13 ) in a compound multiplex signal through the WDM network. The receiver ( 12 ) selects...
7505683 Method, system and storage medium for monitoring power control loops in optical communication networks  
A method, system and storage medium for monitoring power control loops in an optical communication network. The method includes polling network elements to obtain power management information for...
7502566 Light-emitting module  
A light-emitting module outputting laser beam emitted from a semiconductor light-emitting element via a lens, the light-emitting module includes a first main plane, a mount portion on the first...
7502568 Method of using low bandwidth sensor for measuring high frequency AC modulation amplitude  
A slow monitor diode having a bandwidth only partially overlapping a lower end of a data transmission spectrum for a data transmission laser is employed to detect and control average output power...
7496297 LED system for illumination and data transmission  
A LED system ( 100 ) for illumination and data transmission employs a LED driver ( 110 ), an electronic switch ( 130 ), and an illumination unit ( 150 ). In a first illumination state, illumination...
7469102 Wavelength-division-multiplexing passive optical network utilizing fiber fault detectors and/or wavelength tracking components  
Various methods, systems, and apparatuses is described in which a passive-opticalnetwork includes a first multiplexer/demultiplexer, a second multiplexer/demultiplexer, a wavelength tracking...
7463832 Thermal drift compensation system and method for optical networks  
A system and method for detecting and compensating for thermal drift in an optical network in a manner that enables an increased number of optical channels to be used on a given optical medium,...
7457549 Sub signal modulation apparatus, sub signal demodulation apparatus, and sub signal modulation demodulation system  
A sub signal modulation apparatus, with the intention of stabilized transmission of a sub signal superimposed on main signal light irrespective of the intensity of the main signal light when used...
7447432 Regulating radiation component power in wavelength division multiplexed optical communication systems  
There is provided a method of, and apparatus for, regulating radiation component (wavelength channel) power in a wavelength division multiplexed (WDM) optical communications system ( 10 ). The...
7447445 Attenuation and calibration systems and methods for use with a laser detector in an optical communication system  
Systems and methods for use with an optical communication beam are disclosed. The system allows the beam of light to operate at an adequate power level that provides a robust optical link while...
7447443 Method and system for keeping time alignment between optical data modulation and a periodically modulated light source  
A method and system is disclosed for making time alignment for a data transmission system. A first reference clock signal is provided to a first multiplexer coupled to a data modulator through a...
7440698 Optical transmitter system  
An optical transmitter system supplies a plurality of different wavelength optical radiation components to a transmission element which, in operation, is connected to the transmitter system for...
7439533 Optical module and optical communication device  
An optical module includes a light emitting element, a connector part that supports one end of an optical fiber and optically couples the optical fiber to the light emitting element, and a...
7424221 Optical network terminal with illegal transmission detection circuitry  
An optical network terminal, which includes an optical transmitter, monitors the status of the optical transmitter, such as the output or the power consumption of the optical transmitter, to...
7424228 High dynamic range radio frequency to optical link  
A communication system includes an optical transmitter which is differentially driven and an optical receiver that outputs a differential signal. The optical transmitter creates the differential...
7418205 Method and apparatus for controlling a frequency hopping laser  
An optical spread spectrum communication system includes a tunable laser which sequentially outputs optical signals having different wavelengths. The laser produces a frequency spectrum having a...
7415053 Optical transmitter with a least pair of semiconductor laser diodes  
The present invention is to provide an optical transmitter with reduced power consumption. The optical transmitter includes two laser diodes connected in series to each other, one of which is...
7398022 Optical return-to-zero phase-shift keying with improved transmitters  
An apparatus and a method for transmitting at least a digital optical signal with return-to-zero phase-shift keying, employing a single optical modulator with dual-drive design, the encoded optical...
7398023 Method and apparatus for bias and alignment control in an optical signal transmitter  
A method and apparatus for controlling bias and alignment in an optical signal transmitter for providing intensity modulation and DPSK modulation to an optical signal, e.g. in an RZ-DPSK modulation...
7389045 Apparatus and method for monitoring and compensating an optical signal  
Optical communication apparatuses and optical communication methods are provided. According to one aspect, an optical communication apparatus includes a communication path configured to communicate...
7379672 Photonic RF distribution system  
The present photonic RF generation and distribution system provides a system and method for distributing an RF output signal. The photonic RF distribution system includes two optical sources for...
7379671 Optical transmitter  
An optical modulation processing section is provided which, in turn, includes a signal carrier-suppressed pulse modulating unit that performs signal carrier-suppressed pulse modulation on a light...
7376348 Optical communication system  
An optical transmission equipment in an optical communication system interconnecting two optical transmission equipment sets by a main transmission line and a backup transmission line. An optical...
7373091 Multicasting optical switch fabric and method of detection based on novel heterodyne receiver  
The inventors propose herein a switch fabric architecture that allows broadcasting and fast channel access in the ns-range. In various embodiments of the present invention, 10 Gb/s receiver modules...
7369771 Optical network terminator and optical network connection method using it  
An optical network terminator of the present invention includes an optical wavelength division multiplexer for receiving an optical signal and incoherent light. An optical detection unit converts a...
7366416 Hub for a passive optical network hub  
A hub for use in a passive optical network (PON) includes a transmission fiber on which an information-bearing optical signal is received, a double-cladded, rare-earth doped fiber located along the...
7359648 Wavelength tuning optimization of semiconductor lasers  
A method of characterizing a tunable semiconductor laser diode by varying the laser tuning currents of a section, and measuring the output power transmitted by the laser through a wavelength...
7349454 Method of monitoring and controlling a laser diode  
A method of controlling a laser diode measures an average light output power of the laser diode and compares the average light output power to a desired average light output power within a target...
7340186 Discrimination phase margin monitor circuit, transmitting/receiving device and communication system  
The discrimination phase margin monitor circuit ( 10 ) of the present invention comprises a first discrimination circuit ( 11 and 12 ) discriminating an input data signal using a clock signal...
7330666 Method and apparatus for controlling modulator phase alignment in a transmitter of an optical communications system  
A method of controlling phase alignment in a modulator of a transmitter in an optical communications system uses a narrowband optical filter to monitor changes in power spectral density of a...
7324760 Apparatus and method for phase synchronization control in RZ optical transmitter  
An optical RZ transmitter comprises an optical signal source and a pair of electro-optical modulators in tandem, one arranged to receive a NRZ electrical data signal and the other a clock signal at...
7313326 Method to inject pilot tone into microcontroller-supervised DWDM transmitters  
The power of a digital signal such as an optical data stream is set via digital-to-analog converter having a reference input for connection to a DC reference signal. The pilot tone is injected into...
7298977 Optical transmitter  
The present invention is intended to prevent a light-emitting diode from emitting light continuously in the case when the level at an input terminal is fixed high because of software or the like...
7286771 Multi-channel optical transmitter incorporating a tunable optical signal source and method for transmitting a multi-channel optical signal  
The multi-channel optical transmitter is composed of a tunable optical signal source, an optical multiplexer and an intensity reducer. The tunable optical signal source includes a tunable laser,...
7280759 Optical transmission system, optical multiplexer, and optical demultiplexer  
An optical transmission system capable of transmitting with high quality all the component signals of a signal lightwave having a broad total wavelength band and particularly suitable for the CWDM...
Matches 1 - 50 out of 190 1 2 3 4 >