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7630651 |
Method and apparatus for controlling bias point of optical transmitter
An optical transmitter includes: a modulating unit that modulates an optical signal based on an electric signal; a first detecting unit that detects a first variation width of a maximum output of...
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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...
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7606501 |
System and method for generating optical return-to-zero signals with alternating bi-phase shift and frequency chirp
A system and method for generating an optical return-to-zero signal with frequency chirp. The system includes a bit separator configured to receive an electrical non-return-to-zero signal and...
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7599628 |
Method for modulating an optical signal and optical transmitter
A method for modulating an optical signal includes the following steps: modulating the intensity of the optical signal with a nonreturn-to-zero bit signal, and modulating the phase of the optical...
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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...
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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...
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7590359 |
Optical communication node system, all-optical packet routing system, and all-optical packet routing method and all-optical packet routing network using the node and routing systems
To transfer an optical packet generated from one source communication node system to a destination communication node system without optical-to-electrical or electrical-to-optical conversion in a...
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7583902 |
Module to module signaling utilizing amplitude modulation
A method and apparatus configured to incorporate system data for transmission as part of or concurrently with network data. The system data may comprise communication system data for use in...
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7583903 |
Device for regenerating an optical signal, the use of such a device, and an installation including such a device
The invention relates to a device for regenerating the phase of an optical signal carrying an information encoded by phase modulation of said signal, the device comprising an optical modulation...
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7583894 |
Interferometric operation of electroabsorption modulators
Methods and apparatus are described for modulating an optical signal using electroabsorption in conjunction with an optical interferometer. Phase-shift keying modulation can be achieved with lower...
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7580642 |
Modulation scheme for tedons
A system and method for increasing transmission distance and/or transmission data rates using tedons and an encoding scheme to reduce the number of ones in a data signal is described. For example,...
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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...
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7558487 |
Multilevel amplitude and phase encoded signal generation
A method and apparatus for generating multilevel amplitude and phase encoded signals using a pair of 1:N beam splitter/combiner(s) having a pre-defined splitting distribution and an array of...
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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...
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7542678 |
Method and apparatus for a supervisory channel in a WDM fiber-optic communication system
A method and apparatus for providing a supervisory channel in a wavelength division multiplexing (WDM) fiber-optic communication system uses a controlled optical attenuator disposed in an optical...
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7542684 |
Light emitting diode driving device and optical transmission device including the same
A light emitting diode driving device for driving an LED includes (i) a driving pulse current generating circuit for generating a driving current for the LED in accordance with a driving pulse...
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7542631 |
Optical transmission system
An optical transmission system which provides bandwidth restricted optical signal comprises an input terminal ( 10 ) for accepting an electrical binary signal, an amplifier ( 12 ) for amplifying...
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7536113 |
Chirp managed directly modulated laser with bandwidth limiting optical spectrum reshaper
A fiber optic communication system, comprising:
an optical signal source adapted to produce a frequency modulated signal; and an optical spectrum reshaper adapted to receive the frequency...
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7515833 |
Optical double sideband modulation technique with increased spectral efficiency
An all optical network for optical signal traffic has at least a first ring with at least one transmitter and one receiver. The first ring includes a plurality of network nodes. At least a first...
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7509052 |
Optical receiver, optical transmitter and optical transceiver
An optical receiver includes a first light receiving element to convert an optical signal to an electric signal and to output the electric signal from one end. A light receiving element row is...
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7489878 |
Snooping countermeasures for system indicators
A random noise generator is included in the drive circuit supplying power to a system indicator that emits optical signals. The random noise generator generates a random noise signal that is...
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7486897 |
Polarization duobinary optical transmitter
A polarization duobinary optical transmitter is disclosed. The transmitter includes a precoder for coding an electric signal and a light source for generating continuous light. The transmitter also...
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7477849 |
Multilevel amplitude modulated signaling in fibre channel
In a communication system comprising first and second nodes, a multilevel amplitude modulated signaling technique is utilized. The first and second nodes may communicate over a Fibre Channel link...
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7474858 |
Duobinary optical transmission device using at least one semiconductor optical amplifier
A duobinary optical transmission device provides duobinary optical transmission with improved quality by a technique that does not require an electrical low pass filter LPF.A duobinary optical...
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7450861 |
Return-to-zero alternative-mark-inversion optical transmitter and method for generating return-to-zero alternative-mark-inversion optical signal using the same
An optical transmitter for generating return-to-zero alternative-mark-inversion (RZ-AMI) optical signals and a method for generating the optical signals are provided. The optical transmitter...
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7450850 |
Fiber and wire communication system
This invention provides a new architecture for a communication system between head-ends and end-users which expands bandwidth and reliability of the communication system. A mux-node receives...
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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...
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7440702 |
Method for transmitting digital image signal, digital image transmitting device, digital image sending device and digital image receiver
A multiplexer of a transmission section generates a clock signal by multiplying a reference clock signal of a digital image signal by a predetermined number ‘K’. A parallel digital image signal...
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7430376 |
All-optical delay generator for PPM communication systems based on a non-linear waveguide with a chirped DBR
An all-optical PPM modulator comprises one or more sources of trains of optical control pulses and optical signal pulses, the optical control and optical signal pulses being equally spaced, but...
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7426349 |
Method of signal transmission in a WDM communication system
In a representative embodiment, a transmitter of a WDM communication system is equipped with a Mach-Zehnder modulator (MZM) configured to produce an optical signal corresponding to a duobinary data...
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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...
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7421209 |
Optical wavelength multiplexing FSK modulation method
An optical wavelength multiplexing frequency shift keying modulation system. The system includes an optical wavelength multiplexing signal acquisition unit for outputting an optical wavelength...
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7415212 |
Data communication system, data transmitter and data receiver
A transmitter formed of two or more light-emitting sections such as LEDs, which are physically arranged in a predetermined manner, is disposed in the real world object, and each light-emitting...
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7412173 |
Apparatus for generating optical carrier suppressed return-to-zero
An apparatus for generating a Carrier-Suppressed Return-to-Zero (CS-RZ) signal is disclosed. The apparatus includes a mixer, a Low Pass Filter (LPF), a driver amplifier and a single external...
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7406266 |
Flat-topped chirp induced by optical filter edge
A fiber optic communication system comprising:
an optical signal source adapted to produce a binary amplitude modulated signal; and an optical spectrum reshaper adapted to receive the...
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7406267 |
Method and apparatus for transmitting a signal using thermal chirp management of a directly modulated transmitter
A fiber optic transmitter comprising a digital driver adapted to adjust the crossing point of a digital base signal, an optical source adapted to receive the digital base signal and produce a...
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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...
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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...
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7394992 |
Control of an optical modulator for desired biasing of data and pulse modulators
In an optical transmitter, continuous wave light from a laser passes through a data modulator (DM) for non-return-to-zero (NRZ) encoding of a data stream and through a pulse modulator to add...
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7382986 |
Signal converter, optical transmitter and optical fiber transmission system
The signal converter of the present invention receives a multichannel video signal and converts the video signal into a microwave signal, the phase of which has been modulated with the video...
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7376358 |
Location specific optical monitoring
An optical spike is generated at an arbitrarily selected location within an arbitrary optical link. The optical spike is generated by deriving a spike signal having a plurality of components, and...
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7376352 |
Chirp managed laser fiber optic system including an adaptive receiver
A fiber optic communication system comprising:
an optical signal source adapted to produce a frequency modulated signal; and an optical spectrum reshaper (OSR) adapted to convert the...
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7373084 |
Optical network termination device for use in passive optical network based on WDM/SCM scheme
A termination device for use in a WDM-SCM PON system can effectively support a multi-channel integration function of a WDM/SCM PON system. The termination device contained in a termination end of a...
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7373088 |
Agile spread waveform generator
An agile spread spectrum waveform generator comprises a photonic oscillator and an optical heterodyne synthesizer. The photonic oscillator comprises a multi-tone optical comb generator for...
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7369780 |
Remodulating channel selectors for WDM optical communication systems
The present invention provides a remodulating channel selector for a wavelength division multiplexed optical communication system. The remodulating selector receives a WDM input signal, selects a...
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7366424 |
Methods and apparatus for producing transmission failure protected, bridged, and dispersion resistant signals
Apparatus for creating a communication signal, comprising a modulator adapted to: modulate a first and a second beam of continuous wave electromagnetic radiation with a source signal, assemble...
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7362978 |
Duobinary optical transmission apparatus
Disclosed is a duobinary optical transmission apparatus. The duobinary optical transmission apparatus uses the crossed phase characteristics of a duobinary signal without using a feedback-type...
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7352968 |
Chirped managed, wavelength multiplexed, directly modulated sources using an arrayed waveguide grating (AWG) as multi-wavelength discriminator
There is provided a fiber optic system comprising:
a multi-wavelength source adapted to generate frequency modulated signals having different wavelengths, λ 1 , λ 2 , . . . , λ n ; and an...
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7330664 |
Data transmitter and method of generating none return to zero optical signal with clock component amplification
The present invention relates to none return to zero (NRZ) modulation method. The NRZ optical modulation is performed by combining a clock signal and NRZ data at a sending end and signal distortion...
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7324761 |
Single sideband optical transmitter
Described are an optical transmitter and a method for generating a single sideband optical signal. The method includes generating a data signal at a first power level and at a second power level...
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