A method to achieve an extremely wide and flexible control of the group velocity in an optical fiber is presented. Group velocities below 71,000 km/s on one hand, well exceeding the speed of light in vacuum on the other hand and even negative group velocities can readily be obtained.
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机译：提出了一种实现光纤中群体速度极宽和灵活地控制的方法。一方面，小组速度低于71,000 km / s，良好地超过真空的光速，另一方面，甚至可以容易地获得均匀的负群速度。
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