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¿´µ½Ò»±¾¹âÏ˹âѧÀïÓнâÊÍģʽ¼äñîºÏµÄÄÚÈÝ£¬½èÓÃÁËñîºÏгÕñ×Ó¼äµÄÏàλ¹ØÏµ¡£ ÇëÖ¸µãÄı¾±¾ÊéÀïÓÐÏÂÊöñîºÏгÕñ×Ó¼äÏàλ¹ØÏµ±È½ÏÏêϸµÄ¹«Ê½ºÍ̽ÌÖ£¿ As is well known from coupled oscillators, energy always flows from that with advanced phase to that with retarded phase. The energy transfer is most efficient if the phase of the driving oscillator is 90? advanced with respect to the driven oscillator. This can be generalized to traveling waves. Right after the launch point, energy from wave A feeds wave B which at this point just emerges. The phase of wave B is automatically arranged such that an energy transfer takes place. A certain distance down the fiber, both waves have experienced a relative phase shift of 90? and energy transfer ceases. A little further on, the phase of wave B is advanced and energy is transferred back! |
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