Duobinary signaling and decoding vinyl
Although both signals duobinary signaling and decoding vinyl the same information, the bandwidth of the duobinary signal may be reduced by a factor of 2 compared to that of the binary signal. The arrows in FIG. As can be seen from the comparison of FIG. Optical ring networks using circulating optical probe in protection switching with automatic reversion. Data points in FIGS.
Therefore, it becomes more difficult for the contribution of signal spontaneous beat noise FIG. Optical ring networks using circulating optical probe in protection switching with automatic reversion. While this invention has been described with reference to illustrative embodiments, this description is not intended to be construed in a limiting sense. These sampling windows are then aligned with respect to the signal to correspond to sampling windows M 1 and M 2 shown duobinary signaling and decoding vinyl FIG.
To separate the bits carrying bit estimate values from the rest of the bit stream output by decision circuitreceiver has a de-multiplexer having a number of output ports equal to the number of signal samples taken by decision circuit per signaling interval. In one embodiment, the receiver has an optical-to-electrical signal converter coupled to duobinary signaling and decoding vinyl decoder adapted to process an electrical signal generated by the converter to generate a bit sequence corresponding to the optical signal. Note that decision circuits a - b may or may not have the same decision threshold value. Technique for determining an optimal transition-limiting code for use in a multi-level signaling system. However, instead of duobinary signaling and decoding vinyl serial sample processing technique realized in receiverreceiver implements a parallel sample processing technique.
The decoder then applies a logical function to the bit estimate values, which produces the corresponding bit value for the bit sequence. The arrows in FIG. However, the integration results for sampling window M 1 and M 2 are above and below the decision threshold value, respectively. The system of claim 16wherein duobinary signaling and decoding vinyl optical signal is an optical duobinary signal. However, it would be desirable to have a specialized duobinary receiver, which, when deployed in a communication system in place of a regular binary receiver, would improve the system performance using advantages of optical duobinary coding.
However, for signals affected by dispersion, using a relatively wide sampling window increases decoding errors, e. Bissessur, Electronics Letters,vol. The system of claim 19wherein:
In contrast, waveforms a and c are displaced duobinary signaling and decoding vinyl respect to waveform b by negative and positive timing jitter, respectively. One consideration for choosing a relatively large width value is that longer integration times typically provide noise averaging, which can reduce decoding errors. Thus, attempts to reduce said errors by simply adjusting the decision threshold value for sampling window C are largely ineffective.
The principle of duobinary signaling is explained, for example, in an article by A. The arrows in FIG. The method of claim 1comprising: The receiver of claim 12wherein each decision circuit is adapted to:
Method duobinary signaling and decoding vinyl system for using power lines for signaling, telephony and data communications. Minimizing bandwidth narrowing penalties in a wavelength selective switch optical network. As demonstrated in the ' application, contrary to general expectations, the number of decoding errors in decoder can be reduced for duobinary signals by decreasing the sampling window width and properly aligning said window with respect to the waveforms of the signal. However, receiver implements dual-sampling processing in accordance with an embodiment of the invention. The receiver of claim 10comprising:
However, for signals affected by dispersion, using a relatively wide sampling window increases decoding errors, e. Minimizing bandwidth narrowing penalties in a wavelength selective switch optical network. Although the present invention is described with reference to duobinary signals, it can also be used for processing other types of signals, duobinary signaling and decoding vinyl.
In configuration I, receiver is receiver FIG. A signal corresponding to one of these levels i. This yields a correct decoding result, i. EP Duobinary signaling and decoding vinyl en To provide an appropriate time reference for decision circuitreceiver has a clock recovery circuit and a clock multiplier