查询词典 modulator-demodulator

And, the α parameters of frequency chirping of the cutoff intensity modulator are given at first. The cutoff conditions of metal-clad strip or rib waveguides are analyzed by modifying dual effective index method and simple effective index method, respectively.

在理论上，详细论述了截止型强度调制器的工作机理，结合耦合模理论，用近似方法对截止型强度调制器的调制特性进行理论模拟，模拟结果与实验结果的变化规律基本相符合；并首次给出截止型单波导强度调制器频率啁啾α因子的模拟结果。

Their mesogenic temperature ranges cover from 78 to 110 degrees. The milting points of compound 19a and 19b are 43.9 ℃ and 74.8 ℃ respectively while their clearing temperatures are 92 ℃ and 112 ℃. Their mesogenic temperature ranges cover from 36 to 57 degrees. They are suitable for formulating eutectic mixture and for the applications in PDLC, reflective liquid crystal display, and IR modulator.

第三系列同样以2，3-邻二氟苯二炔基二苯基为主体，但相对碳链长度和前一系列相反，将邻二氟苯二炔基端的碳数固定为6，二苯基端碳数分别为2与3，合成出向列型液晶化合物19a与19b，观察到熔点与澄清点温度均较前一系列化合物低，熔点温度下降约20~30oC，澄清点温度下降约50~70 oC，液晶相温度范围约36~57 oC之间，期望能应用在PDLC，反射式液晶显示器，及红外光调节器上。

In the early days of FM, there were no varactor diodes so it was difficult, at best, to produce a direct FM modulator.

在早期进行调频FM时，还没有变容二极管，那时很难生产出一个直接FM调制器。

In this approach, the optical Mach-Zehnder intensity modulator is biased to suppress the odd-order optical sidebands, the fiber laser operates in the second-order rational harmonic mode, and a fiber Bragg grating notch filter is used to block the optical carrier.

这种方法的原理是：调节强度调制器的偏置使其抑制奇数阶谐波的产生，同时使激光器工作在二阶有理数锁模状态，最后用一个光纤光栅消除载波。

Some new display modes stire up people's research interest greatly, which have appeared recently in liquid crystal. The research of ferroelectric liquid crystal spacial light modulator got great breakthrough. Some performace index had greatly been improved and be closed to the standard of optical calculation and application.

近年来，液晶显示领域有出现许多新的显示模式，极大的激发了人们的研究兴趣；铁电液晶空间光调制器的研究取得了很大的突破，某些性能指标有了较大提高已接近光计算等及其应用的水平。

The digital part includes rectangular-to-polar converter and digital phase modulator.

数位部份包括直角座标至极座标转换器及数位相位调变器。

Proposed DSP engine consists of rectangular to polar converter and digital phase modulator that are designed based on the COordinate Rational DIgital Computer and Direct Digital Frequency Synthesizer algorithm respectively.

所提出来的数位讯号处理引擎包含了座标转换器和数位相位调变器，两者分别是利用数位座标旋转器以及数位频率合成器来实现。

The integrated optical chip we designed in the dissertation is composed of a symmetrical Y-branch power splitter, two phase modulators and the TE/TM mode polarizer. Here the up-electrode of phase modulator covers the rib waveguide directly. For the metal-cladded rib waveguide, the loss of different mode is different.

由于相位调制器采用上下电极结构，上电极直接覆盖在脊波导之上；因此利用金属覆盖的脊波导对不同偏振模式的光具有不同的传输损耗这一特性，将相位调制器的上电极同时作为TE/TM模式偏振器使用，这样无需制作额外的偏振器，整个器件的尺寸可以减小。

The diffracted light intensity on axis of a Spatial Light Modulator with Multi-level Phase Fresnel Zone Plate is studied by diffraction optical method.

用衍射光学方法研究了加有多级相位菲涅尔波带片的空间光调制器的轴上衍射光强。

The cells lining the gut combat worm infections by secreting an immune modulator that blocks worms from feeding on host tissues.

肠道内膜上的细胞通过分泌一种免疫调节剂来抵御蠕虫感染，这种调节剂可以阻止蠕虫以宿主的组织为食。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。