raman amplifier

Effective Area and low dispersion maintenance, and its PMD value is extremely low, so that the capacity of the existing transmission system can be easily upgraded to 10 ~ 40 Gbit/s, and easy to use Distributed Raman effect amplification on optical fiber, greatly extending the optical signal transmission distance. 2) New Low-peak optical fiber for man Communication In the metropolitan area network design, you must consider simplifying devices and redu

University Physics Simulation Experiment:(1) Measurement of gravitational acceleration by single pendulum method(2) Determination of Young's modulus of steel wire(3) Determination of photoelectric effect and Planck constant(4) Millikan Oil Drop Experiment(5) Michael's Ear-Sun interferometer(6) Observation and study of polarized light(7) Oscilloscope experiment(8) Experiment of measuring low resistance with double-arm bridge(9) Measuring the gravitational acceleration with Kate(10) Measurement of

had mentored. In other words, he thinks a good mentor should be able to make his graduate students do well, so graduate students ' scientific research ability or scientific research output can reflect whether a scientist is a good mentor. The last few days of my blog, the 10 truths that mentors don't tell you, are also about choosing mentors. Second article, how to is a graduate advisee (how to do graduate), Indira Raman of Northwestern University in

course, because it is in plain text format, you can copy the content at will. The appearance of the plain text model also gives more people, including those with visual impairment, the opportunity to get knowledge from Google Book Search, because the plain text can support multiple types of text readers, for example, a text reading tool, a screen reader, and a Braille display. This also initially achieves the goal of Google, because this method allows more people to obtain information. If you

Directory Next, we need a directory to store data related to Znode and other zookeeper metadata. To do this, we will create a new directory by name zookeeper in/var/lib/ sudo mkdir/var/lib/zookeeper cd/var/lib ls When using sudo to create this directory, it defaults to using root as the owner, and we need to change to the user zookeeper will run so that the zookeeper server can access the directory without any trouble. To change the user, run the following command from the folder/var/lib:

changed. Driven by market competition, operators recognize that without an efficient operating service system (OSS) will not be able to provide users with quality and efficient services, and as OSS systems, the basic transport network will be given the highest priority. (4) With the increasing competition among operators and the decrease of profit, operators will pay more attention to reducing the construction cost of the network. This forces equipment suppliers to seek ways to reduce manufact

During the differential transmission of twisted pair wires, for external interference signals, the two twisted pair wires are equivalent to the Same conductor, and the interference signals have the same amplitude and polarity on the two wires. At the input end of the differential amplifier, if the CMR value of the two-wire common mode input is large enough to receive the difference amplifier, it can be well

To introduce the push-pull circuit, first introduce some basic knowledge about the power amplifier. From the point of view of energy control, there is no essential difference between the power amplifier circuit and the voltage amplification circuit, but the latter requires that the load receive a voltage signal without losing its original strength, the requirement of the former is to get a certain amount of

your router does not cover up a remote area, you can DIY it and add wireless signals to cover up the area. The most popular DIY tips are the use of tin paper, aluminum cans or stainless steel filters to enhance the signal. Although the role will not be exaggerated, at least you don't have to spend too much effort to add a signal to cover up the area. Modify it to enhance the router signal.Another good way to add the signal to cover up the area is the device DD-WRT firmware, so that not only can

grounding system to talk about its design. 1 public broadcasting and paging system The hotel broadcasting and calling system is divided into two categories. One is a public system for public areas (such as the lobby Exhibition Hall and the front-end service area of the hotel). Background Music is broadcast at ordinary times, in case of fire or emergency, it can be switched to emergency broadcast, the second is the Broadcast System for office conference areas and garage areas (professional broad

From: http://blog.jianghu.taobao.com/u/NzkzMzk1Mzg=/blog/blog_detail.htm? Aid = 26948139. Multi-channel lpcm: the original format of lossless audio tracks. It is equivalent to a wave file and does not require decoding. You can directly input a Power Amplifier for DA conversion. Because of the large bit rate and volume, in the DVD era, audio tracks are usually used in two-channel music discs. When the Blu-ray disc is used, the transmission rate and ca

too far. It is best to deploy these three video lines. For example, if the computer is in the study room and you want to use the living room to play videos on the computer and other program content, deploying vga will make this idea a reality. The video lines are relatively rough and it is difficult to expose them to the outside. At the same time, because of the large amount of signal loaded by the color difference line and the DVI line, there is a high requirement on the quality of the wire. P

can be done automatically when the NI pxie-5644r self-calibration process is run.Receiver Signal PathThe NI pxie-5644r Receiver is designed with the top-level architecture shown in 6. This block diagram shows the calibration synthesizer, an optional high power attenuator, an optional low-power signal amplifier, an out-of-band filter, additional gain and attenuation signal conditioning, and a mixer (three) for demodulation based on frequency selection

circuit can be used to lift a near-ground voltage to a predetermined range, the only thing to note is that the output range of the TL431 is not full-width.The TL431 itself has a fairly high gain (I have a rough test in the simulation, about 46db), so it can be used as an amplifier.Figure (5) shows a DC voltage amplifier composed of TL431, the amplification of this circuit is determined by R1 and Rin, equivalent to the OP amp negative feedback circuit

". At this time the drawings "A1.schdoc" internal C1, C2 can and drawings "A2.schdoc" in C1, C2 connected, the same blueprint "B1.schdoc" and "B2.schdoc" can also be connected to the network, but these two groups will not be network connectivity (paper A1.schdoc C1 is not connected to B1.schdoc C1). This is the function of the cross-drawing interface, which can increase the sheet range of the chart symbol.Three, design example 3.1 design ideasNow to design a 2.0 bass

the corresponding analog voltage, the loop splitter added to each phase of the amplifier circuit, the control amplifier circuit to each phase winding to the corresponding current, to achieve the subdivision of the stepper motor. Single-chip microcomputer-controlled stepper motor subdivision drive circuit according to the operation of the last stage amplifier tub

Overview of twisted pair wires and coaxial cables During the differential transmission of twisted pair wires, for external interference signals, the two twisted pair wires are equivalent to the Same conductor, and the interference signals have the same amplitude and polarity on the two wires. At the input end of the differential amplifier, if the CMR value of the two-wire common mode input is large enough to receive the difference

common-mode signal m and the differential-mode signal n.where m= (a+b)/2;n= (A-B)/2.The difference amplifier makes two signals as the output signal. The output signal is a-B, compared with the common-mode signal and the differential mode signal in the original two signals, it can be found that:The common-mode signal m= (A+B)/2 is missing, while the differential mode signal n= (A-B)/2 gets twice times the magnification.This is how the differential mod

Install Intel (R) VTune (TM) AmplifierXE2011 on Ubuntu * 11.04 through Sudo. No error message is reported throughout the process. Use amplxe-gui to call the graphical interface of the tool, create a project, and select the target application. Then, HotspotsAnalysis is used to analyze the target program, and an error occurs unexpectedly. The same problem also occurs in the parallel analysis (ConcurrencyAnal Install Intel (R) VTune (TM) Amplifier XE 11

leakage. And the leakage is divided into three kinds of situation, each has its own methods: 1, small current leakage, regardless of size, the above electrical power supply does not protect whichever. Leakage current in more than 100MA, usually have obvious fever, we can go to touch, find the heating element. If the heat is not too obvious, can be appropriate to improve the voltage, but for the sake of safety voltage should be controlled within 8V, the current to no more than 200MA appropriat