12 Questions 13 Answers 0 Followers
Questions related from Mojtaba Mansour Abadi
I am setting up a test to measure power and spectrum of laser dies. To avoid precise alignment, and also due to lasers' high output power, I have decided to use an integrating sphere to do the...
01 April 2024 4,246 6 View
I need to couple the light emerging a VCSEL into a single mode fibre. I searched the internet, and I couldn't find any out-of-box commercial product to buy. Are there any particular tool like a...
02 May 2017 314 2 View
I am interested in simulation and numerical methods for VLC systems. The method which considers light propagation, reflection, refraction, ... . I am new to this area and I don't know exactly what...
04 March 2016 7,928 8 View
I am wondering is there any commercial/open source/free software available to simulate an indoor visible light communication link.
27 February 2016 3,815 2 View
I need a paper or a book from which to derive the expression for an FSO system which is equipped with selection diversity technique in a weak turbulent channel condition.
14 May 2014 8,000 0 View
I always wonder how one can measure an RF signal or RF receiver parameters using a spectrum analyzer. The first issue is the effect of spectrum analyzer resolution bandwidth (RBW) on the noise...
25 July 2013 1,542 0 View
As I know multi-mode fibers suffer from bad dispersion property. However I have seen that several companies sell multi-mode fibers. I wonder what application these fibers are used for. Note that I...
04 June 2013 8,853 14 View
In the literature, I have seen the terms "hard aperture" and "soft aperture" in various optical systems. I could not find any definition or any physical example to understand these items. Could...
20 May 2013 5,493 1 View
I want to design an x-band corrugated waveguide feed at the central frequency of 10 GHz. If the ridge radius is the same as the smooth waveguide radius (2*r1 = 23.83 mm) then based on the...
22 April 2013 361 0 View
Consider the circuit in the attached picture. R2 and R3 are noiseless. and V1 = (4*k*T*R1*B) if C1 was not in the circuit, it would be possible to use the following equation and calculate the...
16 January 2013 4,796 3 View
I used a collimator to couple a 670nm Gaussian laser into a Plastic Optical Fiber (POF). If the other tail of the fiber is open ended, the light will come out of the fiber and will propagate into...
07 January 2013 5,227 7 View
How are multi-mode fibers used in direct detection methods? Is there a difference between single and multi-mode detectors?
16 November 2012 6,044 4 View
