Patent application number | Description | Published |
20090052906 | Optical Transmission Between a First Unit and a Plurality of Second Units Interconnected by Means of a Passive Optical Access Network - System and method of transmitting downlink and uplink data traffic between a central office terminal ( | 02-26-2009 |
20090214217 | Optical Device and a Method for Converting WDM Signals Into an OTDM Signal and Vice Versa - The invention relates to a device and a method for converting WDM signals into an OTDM signal. The device comprises shifting means ( | 08-27-2009 |
20090269059 | LONG-REACH PASSIVE OPTICAL NETWORK USING REMOTE MODULATION OF AN AMPLIFICATION OPTICAL SIGNAL - A passive optical network is provided, which includes an optical central office connected to a line termination device by a branch of the network including a passive amplification medium. The central office is adapted to send/receive a first data optical signal and has a first amplifier for sending a second amplification optical signal. The second signal exciting the amplification medium to amplify the optical power of an optical signal. The line termination device is adapted to receive the first optical signal, modulate the second amplification optical signal; and inject the modulated second signal into the network. | 10-29-2009 |
20090324246 | Method of Limiting the Non-Linear Phase Noise of a Phase-Modulated Optical Signal of Constant Amplitude, and an Associated Device - A non-linear phase noise limiter device limits the non-linear phase noise that affects a phase-modulated input optical signal of constant mean amplitude conveyed over a transmission line. The device is placed at a zero dispersion point of the transmission line, and it is suitable for suppressing amplitude fluctuations about a mean value in said optical signal. | 12-31-2009 |
20100135654 | MEASURING DIFFERENTIAL GROUP DELAY IN AN OPTICAL FIBER CONNECTION - The differential group delay is measured in an optical fiber connection for an optical signal undergoing a phase modulation BPSK or DPSK by a digital signal at a given rate. A polarization controller at an emerging end of the connection scans polarization states of the modulated optical signal. An emulator iteratively introduces an additional delay in the modulated optical signal emerging from the connection and combines the delayed modulated optical signal and the non delayed modulated optical signal which are both polarized along two orthogonal axes into a resulting optical signal. A polarization controller and a fixed polarizer select a polarization state in the resulting optical signal along one of bisecting lines of the orthogonal axes into a linearly polarized signal. An eye diagram or a spectrum of the polarized signal is acquired by a digital oscilloscope or an optical spectrum analyzer to determine the differential group delay. | 06-03-2010 |
20100142950 | HIGH BIT RATE BIDIRECTIONAL PASSIVE OPTICAL NETWORK, ASSOCIATED OPTICAL EXCHANGE AND LINE TERMINATION DEVICE - The invention relates to a passive optical network comprising an optical exchange linked by at least one optical fiber to at least one line termination device of said network, able to transmit a downlink optical signal phase-modulated in NRZ-DPSK format and to receive an uplink optical signal. | 06-10-2010 |
20130011141 | METHOD AND DEVICE FOR INSERTING/EXTRACTING OPTICAL SUBBAND INTO MULTIBAND OPTICAL OFDM SIGNAL - A device for inserting/extracting at least one optical subband into an optical channel consisting of a plurality of optical subbands. The device includes an extraction means that is capable of extracting a first optical subband belonging to the optical channel, a suppression means that is arranged so as to obtain a filtered optical channel from the optical channel wherein at least one second subband is suppressed, and a coupling means that is capable of inserting a replacement optical subband in place of the second subband in the filtered optical channel so as to obtain a modified optical channel. The device moreover relates to an optical insertion/extraction switcher, using one or more insertion/extraction devices, and to the corresponding insertion/extraction methods. | 01-10-2013 |
20130195445 | COMPENSATION OF MODAL DISPERSION OF POLARIZATION BY DETERMINISTIC JAMMING OF POLARIZATION - A method of calculating a series of control parameters to be applied to a polarization controller arranged so as to compensate for the modal dispersion of polarization affecting an optical signal passing through an optical link by calculating a plurality of polarization states of which the respective representations on a Poincaré sphere are separated from one another by a distance greater than a minimum distance dependent on an acceptable threshold of bit error ratios and, for each state of polarization thus calculated, associating at least one control parameter to be applied to the polarization controller with the calculated state of polarization. | 08-01-2013 |
20130308950 | OPTICAL PASS-BAND FILTERING METHOD AND DEVICE AND A DEVICE FOR INSERTING/EXTRACTING A FREQUENCY MULTIPLEXED OPTICAL SUB-BAND INTO/FROM AN OPTICAL SIGNAL - An optical pass-band filtering device comprises a duplicator able to provide duplicates of an optical signal to at least a first and a second output port; a first optical filtering unit connected to the first output port of the duplicator, said unit having a transfer function that decreases between a first pass wavelength and a first cut-off wavelength; a second optical filtering unit, connected to the second output port of the duplicator, said unit having a transfer function that increases between a second cut-off pass wavelength, the second cut-off wavelength being higher than the first; and coupler connected to the first and second optical filtering units that combine the optical signals filtered by said optical filtering units to obtain a filtered optical signal in which the optical band located between the first and second cut-off wavelengths is removed. A related device node using is also provided. | 11-21-2013 |
20150078764 | Frequency Synchronization for an OFDM Optical Receiver - A method is provided for receiving an optical signal including a step of coherently detecting the optical signal, outputting a multicarrier signal received, and a step of processing the received multicarrier signal, which includes a step of estimating a frequency offset affecting the received multicarrier signal relative to a corresponding multicarrier transmitter signal. The estimation step implements two sub-steps including: a sub-step of determining the entire portion of the frequency offset; and a sub-step of determining the fractional portion of the frequency offset. The sub-step of determining the entire portion implements a measurement, in the spectral range, of an offset between the position of at least one specific carrier of the multicarrier transmitter signal and the position of the corresponding specific carrier or carriers in the received multicarrier signal. | 03-19-2015 |