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Forghieri
Fabrizio Forghieri, Monza (mi) IT
| Patent application number | Description | Published |
|---|---|---|
| 20100239259 | OFDM Transponder Interface With Variable Bit Transfer Rate in Optical Communications Systems - OFDM (Orthogonal Frequency Division Multiplexing) has been proposed for processing signals over WDM channels in an optical network. The number of OFDM sub-carrier channels utilized in transmitting optical signals from a transmitting node to a remote is adapted to the quality of transmission in a WDM channel. Responsive to control signals from the remote node, the number of used sub-carrier channels is set to optimize optical performance of the WDM channel. | 09-23-2010 |
Fabrizio Forghieri, Monza IT
| Patent application number | Description | Published |
|---|---|---|
| 20090097014 | Measurement of Optical Fiber Length and Determination of Chromatic Dispersion Over the Optical Fiber - In one embodiment, first optical signal can be generated at a first end of an optical fiber segment at a first time. The first optical signal can be detected at a second end of the optical fiber segment at a second time. A second optical signal can be generated at a second end of the optical fiber segment at a third time in response to the detection of the first optical signal. The second optical signal can be detected at the first end of the optical fiber segment at a fourth time. A length of the optical fiber segment can be determined based on a difference between the second time and the first time, a difference between the third time and the second time, and a difference between the fourth time and the third time. | 04-16-2009 |
Fabrizio Forghieri, Modena IT
| Patent application number | Description | Published |
|---|---|---|
| 20080259968 | DIFFERENTIAL QUADRATURE PHASE-SHIFT KEYING TRANSMISSION SYSTEM WITH VARIABLE TRANSMISSION RATE - Methods and apparatus for varying the transmission rate of a signal transmitted within a dense wavelength division multiplexing (DWDM) system or network are disclosed. According to one aspect of the present invention, a method includes obtaining a first signal and determining a transmission rate associated with the first. If it is determined that the transmission rate is a first rate, the method includes processing the first signal as having a first transmission format and the first rate. Alternatively, it is determined that the transmission rate is not the first rate and is a second rate, the method includes processing the first signal as having a second transmission format and a second rate. | 10-23-2008 |
| 20090003837 | END-TO-END CHROMATIC DISPERSION CHARACTERIZATION OF OPTICALLY AMPLIFIED LINK - An economic way of determining the chromatic dispersion along a link of a DWDM network is provided. A transmitter modulates the output signals of two lasers operating at two different wavelengths and the modulated output signals are sent into the link. Detectors at each one of a plurality of detection sites along the link determine a phase difference in modulation between the output signals of the two lasers. The chromatic dispersion for each detection site can be calculated from the modulation frequency and determined phase differences at that site. | 01-01-2009 |