Frequency distribution plan having shared signals on left and right with filtration and transmission system thereof
A frequency allocation and scheme technology, applied in the direction of wavelength division multiplexing system, electromagnetic wave transmission system, transmission system, etc.
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[0020] The NRZ signal spectrum is symmetrical to the carrier frequency of the wavelength channel. exist figure 1 In , the straight line represents the carrier. The left and right bands of the signal contain the same information. In the area of overlap indicated by the arrows, it is no longer possible to unambiguously distinguish the information of one channel from the information of adjacent channels. As the channel spacing decreases as in DWDM (Dense Wavelength Division Multiplexing), the overlapping area increases.
[0021] figure 2 The non-equidistant channel distribution is shown. Interval A separates the first two channels CH1 and CH2. Next, CH2 is separated from the next channel CH3 by a gap B. Then, channel pairs are transmitted, and the interval between each channel pair is larger than the interval within the channel pair. The filter function F filters the left band of channel CH1 and the right band of channel CH2. In addition, the left band of CH3 and the r...
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