摘要:
The present invention refers to a signal concentrator comprising: - a parallel to serial conversion device comprising a plurality of parallel inputs and a serial output, - a control unit comprising detection means adapted for detecting the activity of said plurality of parallel inputs of said parallel to serial conversion device, indication means adapted for indicating the active parallel inputs to the parallel to serial conversion device and controlling means adapted for setting an operating bitrate of the serial output in function of said activity of said plurality of parallel inputs.
摘要:
A method for setting the power of a plurality of optical signals (25, 26, 27, 28, 29) in an optical network (99), including: allocating an initial power value (23) for each optical signal of the plurality of optical signals, selecting a first optical signal (25), estimating an error parameter of the selected optical signal at the destination node (C) of the selected optical signal by assuming a lowered power value of the selected optical signal, updating the power value of the selected optical signal to the lowered power value when the estimated error parameter meets an acceptance condition, and selecting a second signal (26), and iterating to the step of estimating, and after at least the first and second optical signals have been selected, setting the power of each respective optical signal to match the corresponding updated power value.
摘要:
Proposed is a method for allocating bandwidth in an optical network. A bandwidth grid containing first bandwidth slots of a lower bandwidth and higher bandwidth slots of a higher bandwidth is provided. A set of requests for respective data transmission connections with respective data rates and respective shortest path metrics is provided. Shorter distances, over which a data signal may be transmitted transparently at the respective data rate within the lower bandwidth, and longer distances, over which a data signal may be transmitted transparently at the respective data rate within the higher bandwidth, are provided. Bandwidth slots of the lower bandwidth for those of the data transmission connections, whose respective shortest path metric is smaller than their respective shorter distance, are allocated. Finally, bandwidth slots of the lower or the higher bandwidth are allocated for the further data transmission connections, using respective numbers of necessary OEO regenerations.
摘要:
Proposed is a method of optical data transmission. The method comprises different steps. A first optical signal and a second optical signal are generated, such that the optical signals possess a same wavelength, respective phases, which are modulated in dependence on respective data values, and respective polarization states, which are essentially orthogonal to each other. A combined optical signal is generated, by combining the optical signals, such that the combined optical signal possesses a polarization state with a predetermined variation. The combined optical signal is transmitter over an optical transmission line and received. Two time-discrete sampled signals are generated, by sampling the received optical signal along two orthogonal polarization planes. Two filtered signals are generated, by filtering the time-discrete sampled signals in the time-discrete domain, using a function that is indicative of the respective predetermined variation. Finally, respective data values are derived from the filtered signals.
摘要:
Proposed is a method of optical data transmission. A first data signal and a second data signal are received at a same sampling rate. A third data signal and a fourth data signal are generated, using the first and the second data signal, wherein the two data signals are delayed to each other by a delay time that is varied over time. The phase of a first optical signal is modulated in dependence on the third data signal, and the phase of a second optical signal with a same wavelength is modulated in dependence on the fourth data signal. The first optical signal is transmitted in a first polarization plane into an optical fibre, and the second optical signal is transmitted in a second polarization plane orthogonal to the first polarization plane into the optical fibre.
摘要:
The invention proposes a system and method for selecting an optimal optical path through which to transmit an optical signal, the optimal optical path is one of a plurality of optical paths in a transparent optical network. Each of the plurality of optical paths includes a plurality of optical elements. For each of the plurality of optical paths, a first optical signal to noise ratio is determined for each optical element in the respective optical path. Then, for each of the plurality of optical paths, nonlinear distortions caused by each optical element in the respective optical path are modelled as Gaussian noise and a second optical signal to noise ratio associated with the modelled Gaussian noise is determined. Finally, the optimal optical path is selected using the sums of the first and second optical signal to noise ratios, respectively.
摘要:
A method of assigning a signal (10) to a central wavelength (5) through a path crossing successive links (1, 2, 3, 4) in a transparent optical network comprising nodes connected by a plurality of links, each link (1, 2, 3, 4) using an optical grid with a constant channel spacing, comprising the steps of: - determining, through the network, the widest channel spaced grid (4) and the narrowest channel spaced grid (1); - parting, at each link (1, 2, 3, 4) through said path, the total optical bandwidth into central wavelengths spaced and aligned with the narrowest channel spaced grid (1); - weighting, at each link (1, 2, 3, 4) through said path, each central wavelength with a weight indicative of the occupation of said central wavelength at said link and of the alignment of said central wavelength with said widest channel spaced grid (4); - combining, the weights encountered through said path for each central wavelength; and - assigning said signal to be routed to a central wavelength with an optimal combined weight.
摘要:
Proposed is a method for generating a look-up table for retrieving data rates for a data transmission connection. The look-up table indicates for a data rate and a transmission distance parameter a set of data rates, wherein the sum of the set of data rates is equal to or greater than the corresponding data rate. The generation of the set of data rates is performed, by determining for at least one test data transmission connection a test set of data rates, for which a number of necessary network resources is optimized. The set of data rates is determined based on the test set of data rates.