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7606487 |
Distortion measurement in optical communication systems
The distortion component of an optical signal received from an optical transmission system, such as an all-optical system, subject to noise and amplitude distortion components, can be evaluated by...
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7561797 |
Optical signal transmitter with active optical e-field degradation
A method and system for controlling optical signal to noise ratio (OSNR) of an optical signal at a receiver end of an optical link. A multi-bit sample stream is generated using a compensation...
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7532818 |
Apparatus and method for measuring coherence sampling quality-factor
An apparatus and method for measuring a coherence sampling quality-factor (Q-factor) are provided, which are used to monitor quality of an optical signal in an optical network in real time. The...
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7505685 |
Wavelength-division multiplex communication system and apparatus
In the WDM communication system, in the absence of data to be transmitted on an optical channel, a pilot signal transmitting means transmits the channel-unique pilot signal data on the channel. A...
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7477847 |
Optical and electrical channel feedback in optical transceiver module
Optical transceivers have loopback and pass-through paths for diagnosing transceiver components and optical networks connected to the optical transceiver or for routing data out of the transceiver...
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7460792 |
Receiving circuit and electronic apparatus for optical communication
In an optical communication-use receiving circuit of the present invention, the pulse width of the received pulse which is a binary signal corresponding to the signal optical pulse is specified by...
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7460784 |
Method for preemphasising an optical multiplex signal
The invention relates to a method for easily and rapidly preemphasizing an optical multiplex signal transmitted by an emitter to a receiver consisting wherein signal-to-noise ratios are equalized...
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7457542 |
Optical access network system
An optical access network system having a function of correcting upstream signal waveform distortions occurring in the PON section, wherein a central office side apparatus comprises a main...
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7457032 |
Arrangement, system, and method for accurate power measurements using an optical performance monitor (OPM)
An arrangement has a WDT (Wavelength-Dependent Tap) coupled in an OCS (Optical Communication System) and an OPM (Optical Performance Monitoring) function coupled to the WDT. The WDT is adapted to...
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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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7440170 |
Method and apparatus for monitoring optical signal-to-noise ratio
Optical signal-to-noise ratio (OSNR) monitoring methods and apparatus are described. A tunable optical filter filters an optical channel containing an optical signal and noise. The total signal and...
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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...
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7426347 |
Shared optical performance monitoring
An apparatus for shared optical performance monitoring (OPM) is provided. A wavelength sensitive device receives light at an input port and routes it wavelength selectively to a set of output...
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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...
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7418212 |
Electrical detection of optical symbols
A system and method for detecting digital symbols carried in a received optical signal. The system comprises a functional element operative to receive a stream of samples of an electrical signal...
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7415213 |
Optical receiver having transient compensation
An optical receiver having compensation for signal level transients. The receiver includes an OE converter, a transient threshold compensator, a threshold combiner and a CDR system. The OE...
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7406268 |
Optical receiver circuit
An optical receiver circuit is constructed to be immune to interference from external interference signals. The optical receiver circuit includes a differential amplifier having an optical...
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7400829 |
Transmission apparatus and path selection method of a transmission apparatus
A transmission apparatus that receives an optical signal by selecting any one of a plurality of provided optical signal transmission paths through protection control is configured to include a...
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7391970 |
Apparatus and method for monitoring optical signal-to-noise ratio
An apparatus and a method for monitoring optical signal-to-noise ratio are provided. It can be applied in dense wavelength-division multiplexed networks to monitor the transmission quality of each...
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7376359 |
Digital regulated light receive module and regulation method
The invention discloses a digital adjusting method for an optical receiver module, and the method implements real-time monitor of parameters, on-line adjustment and non-linear compensation. The...
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7369777 |
Method and apparatus for automatically adjusting the optical power directed to a dispersion compensating element
A dispersion compensator is provided that includes an input port 102 for receiving a WDM optical signal and a dispersion compensating element 110 coupled to the input port for substantially...
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7340187 |
Optical signal monitoring method and apparatus
In an optical signal monitoring method in wavelength multiplexing and an optical network, an area corresponding to a characteristic pattern of an eye pattern of an optical signal to be monitored,...
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7312918 |
Optical transmission system having function of correcting noise light due to Raman amplification
An optical transmission system wherein a main signal light is amplified by Raman amplification, and noise light (ASS light) produced by the Raman amplification can be corrected with a simple...
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7286755 |
Method and apparatus for testing an optical component
The present invention relates to a system for testing the connection paths of a switch fabric by using a spontaneously emitted signal as a test signal. The system includes at least one first module...
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7283744 |
Performance monitoring based on optical autocorrelation
An optical performance monitor (OPM) adapted to (i) sample an autocorrelation function corresponding to an optical signal transmitted in an optical network and (ii) based on the sampling,...
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7274870 |
Apparatus and method for simultaneous channel and optical signal-to-noise ratio monitoring
An apparatus and method for simultaneous channel and optical signal-to-noise ratio (OSNR) monitoring is adapted to function in multi-channel wavelength-division-multiplexed (WDM) optical...
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7266303 |
Handling information in a noisy environment
A method and system for handling information in a noisy environment in the form of at least one information carrying mode is disclosed. A plurality of encoded modes are generated by linear...
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7266297 |
Optical cross-connect
A bit-rate-transparent electrical space-division switching matrix is employed in an optical cross-connect and the input/output stage is constructed from simple, broadband optical receivers and...
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7263287 |
Method and apparatus for assessing performance of optical systems
An apparatus for accelerating assessment of an optical transmission system using Bit Error Rate (BER) tests calculates Q-factors for at least two different extinction ratios from measured test BER...
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7263286 |
Fast testing system for optical transceiver and testing method thereof
The present invention provides a fast testing system and method for optical transceiver, which integrates multiple testing machines in the testing environment for the optical transceiver, so that...
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7257324 |
Apparatus for monitoring optical signal-to-noise ratio
Disclosed is an apparatus for monitoring an optical signal-to-noise ratio in a WDM optical network. The apparatus includes an orthogonal polarization component module for receiving an optical...
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7254345 |
Receiver and receiving method capable of detecting an eye aperture size formed by reception data signals
In a receiver operable in response to a data signal, an eye aperture size is detected along a time axis by an eye aperture detection circuit and is controlled by a control circuit so that it...
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7248804 |
Optical transmission device using a wide input dynamic range optical amplifier
Conventionally, an adjustment of an optical power level of an input Pin of an optical amplifier module is made with an optical variable attenuator. An optical coupler for measuring the optical...
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7248799 |
Method and an improved device for controlling the power delivered at the output of a node of an optical network that switches bands of wavelengths
A device (D) is dedicated to controlling the power of optical signals in a transparent switching node of an optical communication network that switches bands of wavelengths. The device includes,...
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7239807 |
Variable clamp equalization method and apparatus
The present invention relates to a variable clamp equalization method and apparatus, the method includes measuring optical signal to noise ratio (OSNR) values for each wavelength, computing a raw...
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7218850 |
Apparatus and method for monitoring signal-to-noise ratio in optical transmission systems
A high-sensitivity signal-to-noise ratio (SNR) determining apparatus measures the in-band SNR of an optical data signal by detecting and demodulating the optical signal and analyzing a narrow...
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7215883 |
Methods for determining the performance, status, and advanced failure of optical communication channels
Methods of determining the performance and the advanced failure of an optical communication channel. Performance of an optical communication channel may be determined by receiving light signals,...
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7200328 |
Method and system for determining origin of optical signal quality degradation
A monitoring system includes first and second evaluation sections for obtaining an averaged Q-factor parameter and a waveform distortion parameter from an optical signal amplitude histogram...
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7177541 |
OSNR monitoring method and apparatus for the optical networks
It is disclosed that a method and apparatus that automatically monitors each channel's optical signal-to-noise ration (OSNR) using optical filter and polarization extinction method in wavelength...
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7174098 |
Apparatus and method for monitoring optical signal
This invention provides a technique for realizing low-cost optical signal waveform monitoring with improved realtimeness to be applied to signal quality monitoring in an actual optical transmission...
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7149428 |
OSNR monitoring method and apparatus using tunable optical bandpass filter and polarization nulling method
The present invention provides a method and an apparatus for monitoring optical signal to noise ratio (OSNR) in a wavelength division multiplexing optical transmission system. The present invention...
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7149424 |
Method and device for evaluating and improving the quality of transmission of a telecommunications signal through an optical fiber
A system and method for improving the transmission quality of a WDM optical communications system begins by determining the bit-error rate for an optical channel before forward error correction is...
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7146107 |
Method and apparatus for adjusting filter device
A tunable dispersion compensator whose passband center wavelength changes when the amount of dispersion compensation is changed is suitably adjusted. The relationship between temperature for...
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7146099 |
Method and apparatus for optical signal and noise analysis using pulse amplitude histogram
In a method of analyzing an optical communications signal, a threshold is established under control of a processor, and a decision circuit compares the amplitude of the signal to the threshold. A...
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7142782 |
Noise light elimination method, noise light elimination apparatus and optical transmission system, using stimulated brillouin scattering
The invention is aimed at providing a simple noise light elimination technique capable of eliminating noise light components contained in a signal light, together with wavelength components same as...
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7139480 |
System and method for power management in an optical network
A method and system for multi-level power management in an optical network is provided. They include three levels of power management. The first level of power management dynamically changes...
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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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7116454 |
Method for determining signal quality in optical transmission systems
A method for determining signal quality in optical transmission systems, wherein the effective signal-to-noise ratio is determined by measuring amplitude histograms of a signal and by calculating...
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7103283 |
Transmission characteristic compensation control system
A transmission characteristic compensation system enables to reduce the generation of transmission deterioration by estimating an initially selected control direction, and also to compensate in...
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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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