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The highest spectral efficiency DPSK packets have intensity nulls between PI-phase
transitions since the shortest path between the two states in the complex plane crosses the origin, where the amplitude is zero. Constant intensity DPSK signals require larger bandwidth, thus lowering the spectral efficiency, since the path between the two
states follows the unit circle (i.e., a longer path).
³ö×ÔÂÛÎÄ£º360-Gb/s Optical Transmitter With Arbitrary Modulation Format and Dispersion Precompensation
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  • 2013-03-12 11:31:21, 434.41 K

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