Recent content by cyrylabidi

Redbelly98 i have generated 4 sin signal with different amplitudes (different K in 1st method) and calculated losses with 1st and 2nd method. The resuslts are comparable: e.g. result from 1st method: 6,95E+00 dB/cm 4,52E+00 dB/cm 1,40E+00 dB/cm 1,24E-01 dB/cm results obtained with 2nd...

I use a AlGaAs / GaAs waveguide and i calculated value of R for my spectrum of wavelength (for given Al fraction). In my posts i used R=0,3 as a example. I used the same spectrum that for 1st method, i have measured broader spectrum about 10 nm. Of course final calculations will be done on...

Hi, at the beginning thanks for help. my fault the formula should be: alpha = (10 / L) log ... The reflectivity is R=0,3 and k along the x-axis is a wavevector (units are reciprocal micrometers). so do you know another method for loss calculation from this kind of measurments?

From my measurements i obtain Fabry-Perot fringes (Graph1) the formula for 1st method is in graph 1, alpha unit is [dB/cm], R is the facet reflectivity. For calculations with 2nd method i did FFT of F-P fringes (FFT), formula is in pdf file.

marcusl, Redbelly98 thanks for your reply. Redbelly98 i think your equations are good, but i obtain different results from 1st and 2nd method e.g. 1st method 0,449 dB per cm 2nd method 0,223 cm^-1 = 0,99 dB per cm another sample 1st method 10,21 db per cm 2nd method 1,4048 cm^-1 =...

Hi, i have found a formula (in Waveguide Loss Measurement Using the Reflection Spectrum, PHOTONICS TECHNOLOGY LETTERS, VOL. 20, NO. 16, 2008) to calculate losses in semiconductor structures such as waveguide. I want to compare the result with another method (described in Photonic crystal...