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my prof ask me to calculate the phase of each wavelength from a relationship between group delay and wavelength:
τ = A(λ-λo)
τ: group delay
λo = 1550nm
λ: arbitrary wavelength in nm
A: coefficient in ps/nm
This formula shows us how to calculate the group delay, corresponds to a wavelength...
Recently, In DWDM systems, they use thin-film optical filter to construct OADM or OXC. I want to ask some expert here, in simulation, which mathematical model is suitable for modeling this type of filter used in optical network, and why?
I understand well the aspect mathematic of butterworth filter.
My problem now is, how to calculate the coefficients of the denominator of the transfer function in s-domain of an analog butterworth filter without looking up in the table? Of course, we are given a fomula to calculate the poles...
I want papers, books or articles on optical filters. If someone here has been working on this field, please share with me some documents and your experiences???
In addition, have you got some docs on Wavelength-Selective-Switch (WSS), please share here with us. I will not forget the HELP button ;)
I have a small project on microstrip antenna design and my prof recommend me ADS for simulation but it's too expensive to buy for a student. I asked him for a copy with my own PC but he refused and recommended me to work in his Lab. It takes time and I want to do this project in my home.
I'm reading a book on MSP430
1. There's a phrase I do not understand:
Why does Program Counter (PC) increment by 2 not by 1?
2. R2 and R3 act as a constant generators, what are the roles of constant generator? We can generate a constant by using an instruction like ADD or MOV?
3. What is...
1- Recently, What is the technology to produce a memory?
I read an article about memory advancement but I do not understand it completely. It talks about NOR-gate and NAND-gate based technology but I dont know about this technology.
Can some one here show me the answer as clear as possible...
- I know why we have to match the impedance of the generator and the one of the antenna. That is to done to get the most power of the generator at the antenne for radiate. Is this true?
- I know about the Dipole but I dont know why if we do not have a coaxial connector, we have to use BALUN...
I'm studying digital communication where I have met many new concepts (I used to be a electronic engineer)
- What is coherent bandwidth?
- what is ISI?
- what is equalization
I really need your helps because the final exam is coming :(
Thank you in advance!
Added after 2 hours 39 minutes...
I need your help in this project
- I have a barcode scanner with USB port.
- I need to write a program in VC++ in order to read the data from this barcode scanner.
I have done easily with COM-port barcode scanner but with this USB-type, I have no idea where to begin because I'm not familiar with...