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| Number | Title | Issue Date |
| 8160442 | Interferometric optical signal-to-noise ratio measurement using a calibration factor Systems and methods are described that measure the OSNR of an optical channel. Embodiments provide OSNR measurement methods that distinguish the intensities of the coherent modulated signal from the incoherent noise intensity occupying the same optical band using a ... | 04/17/2012 |
| 8160443 | Calibration factor for interferometric optical signal-to-noise ratio measurement Systems and methods are described that measure the OSNR of an optical channel. Embodiments provide OSNR measurement methods that distinguish the intensities of the coherent modulated signal from the incoherent noise intensity occupying the same optical band using a ... | 04/17/2012 |
| 8073325 | OSNR measuring apparatus and OSNR measuring method An apparatus for measuring an OSNR for a communication channel in a WDM optical communications system includes a signal control unit, a receiving unit, and a measuring unit. The signal control unit controls spectral width reduction for an optical signal sent through... | 12/06/2011 |
| 8050558 | Optical signal sampling apparatus and method and optical signal monitor apparatus and method using the same The optical signal sampling apparatus and the optical signal monitor apparatus are configured of an optical combiner for combining an optical signal to be sampled and a sampling light pulse with each other and an electroabsorption modulator. The electroabsorption mo... | 11/01/2011 |
| 8041212 | Method and arrangements for determining the optical signal-to-noise ratio for an optical transmission system According to the invention, various noise currents are added to the electrical data signal after the opto-electric conversion of an optical data signal, and an optimum decision threshold for the electrical data signal equipped with this noise current is determined f... | 10/18/2011 |
| 7986878 | Adjustable bit rate optical transmission using programmable signal modulation Techniques, apparatus and systems to provide adjustable bit rate optical transmission using programmable signal modulation in optical communication systems. ... | 07/26/2011 |
| 7680412 | Method and device for in-band optical performance monitoring A method and device for determining in-band noise of an optical signal. The optical signal is split to produce two optical signal components, of distinct polarisation, such that the respective noise component in each signal component is uncorrelated. The optical sig... | 03/16/2010 |
| 7643752 | Testing of transmitters for communication links by software simulation of reference channel and/or reference receiver A transmitter for a communications link is tested by using a (software) simulation of a reference channel and/or a reference receiver to test the transmitter. In one embodiment for optical fiber communications links, a data test pattern is applied to the transmitter... | 01/05/2010 |
| 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 function adapted to compensate impairments of the optical link A digital n... | 07/14/2009 |
| 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 by means of simple measurement or new adjustment of signal power on th... | 12/02/2008 |
| 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 noise power at the output of the filter is measured as the transmitt... | 10/21/2008 |
| 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 of a fUrther received first input signal (IS 1). When su... | 10/14/2008 |
| 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 ports. To perform optical performance monitoring on the output ports, a mo... | 09/16/2008 |
| 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 determine when the optical transmitter is illegally transmitting. When an i... | 09/09/2008 |
| 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 derived from the received optical signal and to evaluate a non-linear f... | 08/26/2008 |
| 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 converter receives the incoming optical signal and provides a modulated elect... | 08/19/2008 |
| 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 reception device connected to one input of the differential amplifier. The op... | 07/29/2008 |
| 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 plurality of optical signal outputting sections that output the optical s... | 07/15/2008 |
| 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 optical channel. The apparatus comprises an optical circulator, a tun... | 06/24/2008 |
| 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 digital optical receiver module includes elements as follow: a voltage o... | 05/20/2008 |
| 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 compensating the WDM optical signal for dispersion that has ac... | 05/06/2008 |
| 7340165 | Optical amplifying device An optical amplifying device disposed on a transmission path of a WDM signal includes an optical amplifier amplifying the WDM signal, a detecting unit detecting a change in a transmission wavelength count contained in the WDM signal and/or a change in light receivin... | 03/04/2008 |
| 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, which characterizes a deterioration, is extracted from a database stor... | 03/04/2008 |
| 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 configuration and with high accuracy. The optical transmission system inclu... | 12/25/2007 |
| 7302176 | Optical network A medium-scale IP telecommunications network is configured in a low-cost optical network with good reliability and expandability. A physical configuration example has a center node 2-1 and eight local nodes 2-11 through 2-18... | 11/27/2007 |
| 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 and at least one second module, wherein each one of the second modul... | 10/23/2007 |
| 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, characterize two or more impairments concurrently present in the optical signa... | 10/16/2007 |
| 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 communication systems. A polarization controller is sequentially adjusted to pe... | 09/25/2007 |
| 7269347 | Optical receiver decision threshold tuning apparatus and method A method of controlling an optical signal receiver utilizes three control loops: a first control loop tunes the decision threshold of the receiver when the optical network is in a substantially steady state and a second control loop rapidly switches to a reference d... | 09/11/2007 |
| 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 transformation of the information carrying mode, said encoded modes being pro... | 09/04/2007 |
| 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 transmitters. Since the switching matrix operates in unclocked manner, i.... | 09/04/2007 |
| 7266298 | N-way broadcast/narrowcast optical combiner demultiplexing a multiplexed narrowcast input signal Systems and methods are described for an optiplex. A method includes: demultiplexing a multiplexed narrowcast input signal into a first narrowcast signal and a second narrowcast signal; conveying the first narrowcast signal to a first optical combiner; conveying the... | 09/04/2007 |
| 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 the user can employ the testing system for optical transceiver for rap... | 08/28/2007 |
| 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 values, and extrapolates to determine a Q-factor for an operational e... | 08/28/2007 |
| 7263151 | High frequency loss of signal detector Methods and circuitry for implementing high speed loss-of-signal detectors for use in Gb/s telecommunication applications. The invention measures bit error rate (BER) of the incoming data by comparing the phase of the clock signal extracted from the incoming data wi... | 08/28/2007 |
| 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 signal and outputting it after removing a signal component thereof at a sp... | 08/14/2007 |
| 7254325 | Method and system for optical performance monitoring In accordance with one embodiment of the present invention, a system for monitoring a performance characteristic of an intensity modulated phase shift keying optical signal includes a splitter, a first detector, and a second detector. The splitter is operable to rec... | 08/07/2007 |
| 7253902 | Wavelength detector A radiation measurement device for determining a wavelength-related characteristic of radiation from a radiation source is provided. The device includes a wavelength-dependent optical element (e.g., bandpass filter), and an optical power-measuring detector (e.g., ph... | 08/07/2007 |
| 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 becomes a maximum. The eye aperture detection circuit determines different ... | 08/07/2007 |
| 7248398 | Method for determining the gain spectrum of a Raman amplifier in a WDM-transmission system The invention relates to a method and device for determining the gain spectrum of a Raman amplifier having an optical amplifier, which is connected in incoming circuit thereto, in a section of a WDM transmission system. A number of spectra are recorded at the output... | 07/24/2007 |
