index of modulation 中文意思是什麼

index of modulation 解釋
調變因素
  • index : n （pl es dices ）1 索引。2 指標，標準，標志。3 示[食]指 （＝index finger）。4 指數。5 【印刷】指...
  • of : OF ＝Old French 古法語。
  • modulation : n 調整，調節；（聲調的）抑揚，變化；【音樂】轉調，變調；【無線電】調制。 amplitude modulation 振...
  1. The theoretical expression of the critical angle is acquired, showing that it rises with the increase of the depth and period of modulation of refractive index. also, it increases as the beam width decreases

    從理論上得到了該臨界角的表達式，它隨折射率調制周期、調制深度的增加而增大，且光束越窄臨界值越大。
  2. The recording characteristics of the material are discussed in detail in terms of sensitivity, diffraction efficiency, bragg angle, refractive index modulation ( an ) and so on

    通過在材料中記錄無傾斜光柵，研究了該材料的全息存儲特性（包括衍射效率，靈敏度，動態范圍，折射率調制度，角度選擇性等） 。
  3. The propagation and control of soliton in nonlinear kerr optical lattice with harmonic modulation of refractive index are investigated analytically and numerically in this paper. and some innovative research results have been worked out. the forming conditions of lattice soliton from gauss beam and the two modes of its stable propagation are obtained for the first time

    本文利用解析和數值方法研究了在具有橫向折射率周期性調制的克爾型非線性光學格子中孤子的傳輸和控制，做出了一些創新性的研究結果:首次得出了高斯光束形成格子孤子的條件和兩種穩定傳輸形式。
  4. The optical waveguide characteristics such as waveguide mode field profile, and the mode cut - off conditions, and the waveguide dispersion are analyzed with the solution of a certain wave equation. the mechanism of index ellipsoid of linbo _ 3 crystal distorted with an external applied electric field by means of the electro - optic tensor as investigated. based on the operation principle of m - z waveguide, the operation mechanism of the two - section cascaded m - z waveguide and of the modulation electrode are

    調制器的結構設計從m - z干涉型光波導工作原理出發，分析兩級串聯m - z干涉型光波導的工作原理，調制電極的工作原理，從而設計出了工作於1 . 054 m的、兩級串聯m - z干涉型光波導、行波電極linbo _ 3為強度調制器的結構參數。
  5. This paper mainly focuses on the noise limiting by means of the direct sequence spread spectrum ( dsss ) and the analysis of the transmission performance of the plc and some digital modulation technology. the contents of the paper is as follows : 1 ) the technical feasibility is proved after simulating noise limiting principle of dsss by means of systemview, the simulation software ; 2 ) a kind of band pass filter ( bpf ) is realized according to the requirement of filter and the principle of butterworth approximation, which satisfies the index of performance of dsss. 3 ) the low voltage plc system includes the sc1128, the specific modulation / demodulation ic, the bpf filter and other circuit components, furthermore, the control function of system is realized by means of the personal computer and the microcontroller

    本課題在對低壓電力線的傳輸特性和數字調制技術進行分析的基礎上，將通信理論中的直接序列擴頻技術（ dsss ）用於解決低壓電力線通信的干擾問題，主要研究內容如下： （ 1 ）用通信模擬軟體systemview對dsss技術的通信和抗干擾原理進行模擬分析，分別對時域和頻域下採用dsss技術前後接收信號的頻譜進行分析，驗證dsss技術在本系統中的可行性； （ 2 ）由dsss技術對濾波系統的要求，根據濾波理論分析了巴特沃思型濾波器的逼近原理並設計了合適的濾波電路； （ 3 ）用調制解調晶元sc1128和自行設計的濾波器加之輔助外圍電路，構造出低壓電力線載波通信系統，並採用atmel公司的單片機設計了接收和發射電路的微控制器； （ 4 ）分別對採取抗干擾措施前後輸入和輸出信號進行對比實驗，並對結果進行分析，驗證了dsss技術對干擾信號的抑制作用。
  6. In chapter 5, a long - period fiber grating with rectangular index modulation is studied by the coupled - mode theory. the couple - mode equations that describe the mode coupling in this kind of grating are presented

    本章仍以耦合模理論為基礎，首先對該類型光柵的折射率微擾進行展開，進而推導其相應的耦合系數和建立耦合模方程。
  7. Furthermore, we analyze fiber bragg grating of a constant refractive index modulation and period, found the coupled - mode equations that describe interactions between the forward - propagating guided core mode and the backward - propagating guided core mode itself

    並用耦合模理論對最簡單的均勻光纖布拉格光柵進行分析，建立其耦合模方程，並給出解析解。
  8. A comprehensive theory is presented for fm spectroscopy of doppler - broadened molecular iodine absorption lines. the relationship betwcen fm spectroscopy and modulation frequency and modulation index has been studied. the whole circuit for thc frcquency stabilized laser system has been developed

    建立了多普勒加寬碘分子線性吸收fm光譜的一般理論，對fm光譜與調制頻率和調制度的關系進行了研究；並研製了532nmnd : yvo _ 4 / ktp碘吸收穩頻激光器的電路系統；提出了虛擬激光穩頻技術的概念。
  9. The tests of e - o applications by our flux ktp has been realized, the results showed : optical waveguides fabricated by using an ion - exchange process, which have an exchange - ion concentration depth profile and refractive - index profile, is close to a complementary error - function distribution, optical homogeneity and device thermal stability is much better. amplitude modulation switch formed by our flux ktp has the contrast ratio of 150 : 1 and insert loss is 2. 5 % at 1064 nm. high quality optical pulse with 1 ns width was cut successfully by using an e - o modulator from a laser pulse with 50 ns width, this modulator had run for three years, and the crystal did n ' t blackened, it showed our low conductivity flux ktp can endure high modulation voltage for a very long time

    Ktp晶體的電光應用試驗表明：用離子交換法製作的電光波導，其離子交換濃度、折射率變化符合餘弦誤差函數，光學均勻性以及器件的溫度穩定性較好；製作的強度調制電光開關，消光比為150 ： 1 ，對1064nm激光的插入損耗為2 . 5 ；製作的電光調制器用於激光脈沖整形試驗，從脈沖寬度50ns的激光脈沖削出脈寬1ns的高質量光脈沖，該電光開關經過長達三年多的使用，沒有出現晶體變黑現象，說明本實驗的低電導率ktp晶體能夠耐受長時間的調制電壓。
  10. A novel topology of dc - rail zvt voltage source three - phase pwm inverter is advanced. the principle, design considerations, modulation index and efficiency of the proposed inverter are discussed in detail

    提出了一種新型直流母線零電壓過渡電壓源三相pwm逆變器，並對該電路的工作過程、參數設計、調制系數以及工作效率等進行了詳細的分析和試驗研究。
  11. Some modulation parameters, such as the carrier frequency and the symbol rate, can be estimated prior to the recognition of modulation types. such other parameters as the modulation index, the modulation frequency deviation, and the signal broadband can be further estimated after recognition

    部分調制參數如載波頻率、符號速率在識別之前獲得，在識別完成之後可以進一步估計調制指數、調制頻偏、信號帶寬等其餘參數。
  12. They pointed out that modulation wave fronts ( such as those in the front of a light pulse ) in a negative index material are aligned the same way as they are in a positive index material ? anything else would violate basic causality and require parts of the wave to travel with infinite velocity

    他們指出在負折射率材料中調制波前（例如光脈沖前端的波前）的方向，與在正折射率材料中相同；若非如此，就會違反基本因果律，且部份波的前進速度將成為無限大。
  13. Self - focusing and self - defocusing have their origin in the intensity dependence of the refractive index of the nonlinear medium. the picture becomes more complicated when two copropagating optical beams affect each other through nonlinear cross - phase modulation

    當兩光束共同在非線性介質中傳輸時，兩光束由於交叉相位調制效應將會相互作用，其物理機制變的比較復雜。
  14. Therefore, fiber gratings have numerous applications in almost all the realms of optical fiber, especially in wavelength - division multiplexing ( wdm ) all - optical networks. this dissertation presents a detailed study of the following three types of fiber gratings : fiber bragg grating fabricated with cladding mode suppression fiber, linearly chirped moir fiber grating, and long - period fiber grating with rectangular index modulation

    本文以目前在wdm全光網中有良好應用前景的三種類型的光纖光柵（用包層模抑制光纖製作的光纖布拉格光柵、線性啁啾moir光纖光柵、矩形折射率調制型長周期光纖光柵）的理論和設計為研究內容。
  15. Abstract : first, this paper deduced the diffraction equation for refractive index phase modulation holographic grating, and pointed out that the diffraction efficiency was mainly influenced by refraction index modulation, and the diffraction efficiency of different levels came from many factors. the volume grating effect affected the diffraction efficiency of transmission hologram

    文摘:首先推出折射率相位調制型全息光柵的衍射方程，由此說明衍射效率主要取決于調制折射率，且各級衍射光的衍射效率不同是多種原因造成的。
  16. This paper also discussed the factors that influenced the diffraction efficiency of scattering object, and proposed the amount of refraction index modulation was very small, the diffraction efficiency was mainly determined by chemical treatment

    並指出體積光柵效應對透射全息衍射效率是有貢獻的，討論了影響散射物體全息衍射效率的問題，最後指出在一般情況下，調制折射率是一個很小的量，化學處理對它起著關鍵性的作用。
  17. Based on these, we get the simulation results of reflect spectrum, and analyze the characteristics of fiber bragg grating of a constant refractive index modulation and period

    分別採用耦合模和轉移矩陣法對bragg光纖光柵和切趾光柵的反射光譜進行數值模擬模擬，並分析了光柵反射光譜的特性。
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