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COMSOL Design Tool
Project Descriptions
Institute of Electromagnetic Fields (IEF)
Nikola Đorđević – [email protected]
|
Salamin Yannick - [email protected]
30.04.2015
|
1
Content
 Project descriptions
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Directional Coupler
MMI coupler
Ring Resonator
Delay Line Interferometer (2 students)
Bragg Mirror
Institute of Electromagnetic Fields (IEF)
Nikola Đorđević – [email protected]
|
Salamin Yannick - [email protected]
30.04.2015
|
2
Directional Coupler
 What happens when we bring
two waveguides close?
L
 Power is divided!
 Can we control it?
 Coupling strength
 Length of coupling section
 You will learn about this in week
or two!
Institute of Electromagnetic Fields (IEF)
Nikola Đorđević – [email protected]
|
Salamin Yannick - [email protected]
30.04.2015
|
3
MMI Coupler
 MMI – Multi Mode Interference
L
 Modes interfere in larger section
 Divide power in two channels
 Extension: 1x4 MMI coupler
W
1x2 MMI coupler
Institute of Electromagnetic Fields (IEF)
Nikola Đorđević – [email protected]
|
Salamin Yannick - [email protected]
30.04.2015
|
4
Ring Resonator (Filter)
 Use resonator to filter out
defined wavelengths (λres)
output
input
R
resonator
λres
 Ring Resonator supports
defined wavelength.
 When brought close to the
waveguide  this wavelength
will be trapped in the resonator.
 Doing that, light is efficiently
filtered out and transferred into
the other waveguide
 Add-drop filter
 Extenstion:
 Make a cascade of filters for
more wavelengths
Institute of Electromagnetic Fields (IEF)
Nikola Đorđević – [email protected]
|
Salamin Yannick - [email protected]
30.04.2015
|
5
Bragg Mirror
 Mirrors are key parts in making
a laser, for example.
 The question is, how to make a
broad band mirror?
 Reflection properties are defined
by period of the mirror (Λ), filling
factor, and number of periods.
 Goal is to design mirror with
99% of reflectivity over defined
range of wavelengths.
 Extension: turn mirror into filter!
Λ
Institute of Electromagnetic Fields (IEF)
Nikola Đorđević – [email protected]
|
Salamin Yannick - [email protected]
30.04.2015
|
6
Delay Line Interferometer (2 students)
 Phase change  interference
 Split light change the path 
phase change!
phase difference
split
Institute of Electromagnetic Fields (IEF)
Combine and
see interference
 Here, we want to access how
long should be the delay line in
order to achieve interference.
 In reality, we change index of
refraction, but here we want to
show proof of principle.
 Phase is different in two arms
since the upper one is longer.
 Once combined, signal can be
either divided or emerge at one
arm.
Nikola Đorđević – [email protected]
|
Salamin Yannick - [email protected]
30.04.2015
|
7
Rules of the game
 Decide about the projects by Sunday, 19th of April,00:00
 Or even now. 
 Once we know what are you working on, you will get detailed
description, with defined milestones. (We are always open for
questions, don’t forget that! )
 Discussion about the project reports and presentation is
planned for the following weeks.
Institute of Electromagnetic Fields (IEF)
Nikola Đorđević – [email protected]
|
Salamin Yannick - [email protected]
30.04.2015
|
8