In order to improve the uplink bandwidth utility, that is, keeping the guard band between conterminous ONU slots as short as possible, as well as avoiding the upstream data collision, OLT must take the RTT of ONU into account, when arranges the start and ending time of ONU's transmission window.

為了提高EPON上行帶寬利用率（即盡量縮短相鄰ONU時(shí)隙之間的保護(hù)帶長(zhǎng)度）免费网站华人，同時(shí)避免上行數(shù)據(jù)沖突91短视频在线免费观看，OLT在安排給ONU的授權(quán)窗口的開始時(shí)間和結(jié)束時(shí)間時(shí)不卡日本黄色三级片，必須要將ONU的距離考慮在內(nèi)bbixx.com。

On the basis of comparison of several algorithms of the calculation of unstable resonator"s mode. Fast Fourier transform method is chosen in this paper. The model of multi-layer distribution of gain is established. Sampling granularity in real space used in FFT, quotient of guard band and distance between subsections are made certain respectively. The convergence criterion of root-mean-square of plural y which is the quotient of the optical field"s distributions separated by one pass is established. Under the circs of multi-kind of distribution of gain and different measurement of distortion, the output optical field distribution is calculated.

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Guard against Damp：謹(jǐn)防潮濕

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