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1. The group velocity is the speed at which modulated signals would be transmitted.

2. Concepts of group velocity and dispersion in electrodynamics course are discussed in this paper.

3. In the fast light or superluminal (with a group velocity faster than c or negative group velocity) case, the main wave packet seems to get 'confused' and does not follow the group velocity.

4. The effects of group velocity mismatch and dispersion, third-order nonlinear phase modulation on pulse shape, spectrum distribution and conversion efficiency of second-harmonic pulse were discussed.

5. Thus the negative group velocity is simply an apparent velocity as we shall show from the study of energy flow.

6. We discover that the superluminal group velocity is an unstable phenomenon after the comparison between the superluminal group velocity and the normal velocity of light.

7. "In the slow light (with a group velocity slower than c) case, the central part of the main wave packet follows the group velocity, " Du explained.

8. Although previous studies have found that the "group velocity" of light can travel faster than c, the "signal velocity" –the speed at which information travels –cannot.

9. In addition, the group velocity of the probe laser can be reduced at each transparency window.

10. The function relation of pulse group velocity with frequency and rain rate is obtained.

11. This paper reveals that the group velocity of a weak laser probe field can be manipulated by controlling the intensity of the driving field applied to a near-degenerate closed three-level V system.

12. This paper analyze the modes in rod by short -time fourier transform. The results of time- frequency analysis are consistent with the group velocity dispersion curve.

13. When the medium density increases (with more atoms)(Sentencedict), the slow group velocity decreases.

14. Without considering curvature effect, we study the contribution of the electronic heat capacity, group velocity and density of states of(6,0)Single-walled carbon nanotubes.

15. According to basic physical concepts and theoretical results we conclude that the negative group velocity itself is not superluminal.

16. The result indicates that the hybrid mode can be given within work frequencies, in which the main mode is TE21. The value of group velocity of hybrid mode is a constant number.

17. The correlation property between the distribution of attenuation factor and that of the group velocity is indicated, in this study.

18. The main wave packet of a single photon travels no faster than c in any medium, and can be delayed up to 500 ns in a slow light medium where the group velocity is slower than c.

19. On the basis,(sentencedict.com) the relation between the enhancement of stimulated emission as well as transmissivity being greater than one and the abnormal group velocity in photonic band gaps as well as n.

20. Evolution of chirp is simulated by computer and chirp as a function of the fiber loss and group velocity mismatch is analysed.

21. To validate the theoretical analysis, a test system for group velocity delay was set up based on RF modulation.

22. By this structure, we reduce internal reflection loss effectively, and debase the group velocity of light transmission. Furthermore, we sum up theoretical analysis methods of photonic crystal.

23. In light of this finding, scientists have wondered whether single photons travel at the group velocity or the signal velocity.

24. The properties of nonlinear crystal BBO is presented. The walk-off angle and the spatial walk-off effect, the group velocity mismatch and the temporal walk-off effect are discussed.

25. Based on the theory of elastodynamics, the longitudinal guided wave and flexural guided wave group velocity dispersion curves for M22 stud were calculated.

26. The paper studies the concepts of phase velocity and group velocity on electromagnetic wave propagation and discusses the relation between signal conveyance and energy conveyance.

27. Experimentally, a light pulse propagating through the atomic vapor cell has its peak reaching the exit side before entering it, resulting in a negative transit time , and negative group velocity.

28. Besides, it puts forward the suggestion on the image transmission of superluminal group velocity and the experiment on numerical coding transmission.