new homepage

fiberdesk's homepage has a new layout and new tutorials as a diashow. Please take a look at www.fiberdesk.com

Took me several hours to get fiberdesk compiled with the latest Visual Studio Community 2013. All libaries and the Win SDK needed to be synchronized. Seems that the libaries have not yet been prepared for this release so it was a lot of manual tweeking ...

new release - fiberdesk 5

fiberdesk 5 comes with an improved adaptive algorithm, equation parser and new options.

For all customers using version 4, the updates are provided via fiberdesk 5 (lite), where some new features are disabled. Nevertheless they will benefit from bug fixes and other updates.

The GUI is modern Win 8 style.

toward version 5

... these are the final fixes until the new release. There has been a complete rewritten core code with parsing and improved adaptive control. Here is a nice new video showing multi order stimulated Raman scattering (broadband) via the Nonlinear Schrödinger Equation.

At each point of conversion, the energy drops due to quantum defect as shown in the measurement window:

Additionally, free parameters have been added. This allows simultaneous variation of other parameters by assignment while only the free parameter is changed. For instance: parameter "a" is set as the central wavelength for the high reflecting and low reflecting mirror and the resulting cavity simulation will show the behaviour for different wavelength in a one-dimensional parameter variation of "a".

Tutorial "Nonlinear pulse propagation in fibers"

Here are the slides and videos of the tutorial "nonlinear pulse propagation in fibers"

slides: http://www.fiberdesk.com/heraeus-seminar-2013.pdf
videos: http://www.youtube.com/user/fiberdesk‎

from Hereaus Seminar:

http://photon.physnet.uni-hamburg.de/de/ilp/teaching/sose2013/wilhelm-und-else-heraeus-seminar/scientific-background/

status of fiberdesk 5

fiberdesk 5 - the next major release - will have the following features:

- parser
- custom measures via parser
- enhanced parameter variation
- enhanced plotting
- cw-SRS

Here is a first view on the new parameter variation dialog, where the custom measure M49 is evaluating the power from 1100-1200 nm, M1 is the average power so the result is "100*M49/M1" by parsing - the relative power content of Raman scattering. The modell is a cw fiber laser cavity and the pump power is varied.

Rate Equation and Parameter Variation

fiberdesk ignored the "add quantum noise" option during parameter variation. This bug is removed now. Below you see the variation of the input power in a fiber amplifier (1 W pump, rate equation without ASE) and the output power as a measurement result. Up to ~10 mW the amplifier gives the full small signal gain then saturuates and finally increases linearly because the output power is in the same order of magnitude as the input power.

However, if you perform the simulation again including ASE, the total output power is dominated by ASE (in the example 13 mW) in the range below some µW of seed power.