Electrodynamic Insights

Electrodynamic Insights

Explore the bending properties of coated few-mode fiber…

1. Launch FiberDev 2.0 2. Define the index profile layer by layer

Here, we create the index profile

We could also load the profile from a file if we had already created and saved it

Graded-index core

Graded-index core

Pure silica shoulder

Pure silica shoulder

Trench

Pure silica cladding

Pure silica cladding

Coating

The coating index is 2% above the cladding index. The bulk absorption loss of the coating is set to 1 dB/cm

PML

This completes the profile. We can save it to a file for later use

Graded-index core

Pure silica shoulder

Trench

Pure silica cladding

Coating

PML

3. Set up the bend propagation 4. Plot and view the results

Dialog for control of circular bend propagation

Dialog for control of circular bend propagation

Set to perform sweep over wavelength and bend radius

Dialog for control of circular bend propagation

Explore the effect of the coating index on the bending properties of standard step-index single-mode fiber…

1. Define the index profile layer by layer 2. Set up and run the bend propagation

Here, we will create the index profile

We could also load the profile from a file if we had already created and saved it

Core (4.1 microns) with Delta = 0.36%

Core (4.1 microns) with Delta = 0.36%

Pure silica cladding

Pure silica cladding

Coating

Start with lossy coating index-matched to cladding. The bulk absorption loss of the coating is set to 1 dB/cm

PML

This completes the profile. We can save it to a file for later use

Core (4.1 microns) with Delta = 0.36%

Pure silica cladding

Coating

PML

The dialog for control of the circular bend propagation

The dialog for control of the circular bend propagation

Set to perform a sweep over wavelength and bend radius

The dialog for control of the circular bend propagation

3. Change the index of the coating 4. Set up and run the bend propagation

Edit the current index profile

Change the coating index to be 2% above the cladding index

Change the coating index to be 2% above the cladding index

Change the coating index to be 2% above the cladding index

5. Plot and view the results

Explore the properties of the field emerging from the endface of a hollow-core 1D photonic bandgap fiber at various distances from the endface…

1. Load the index profile from a file

Here, we load the profile from a file we had created earlier

The profile has 24 alternating high-index and low-index layers surrounding a large hollow core

The profile is designed to produce an HE bandgap centered at 10.6 microns

The fiber is intended to carry CO2 laser light

An expanded view of the high-index/low-index layers

An expanded view of the high-index/low-index layers

An expanded view of the high-index/low-index layers

2. Evaluate the modes needed to represent the field incident on and reflected from the endface

The dialog controlling mode evaluation

The dialog controlling mode evaluation

The dialog controlling mode evaluation

3. Evaluate the field emerging from the endface at various distances

The field emerging from the endface is represented exactly at any distance with Hankel transforms

The field emerging from the endface is represented exactly at any distance with Hankel transforms

The dialog controlling the evaluation of the emerging field

The dialog controlling the evaluation of the emerging field

Here, we evaluate the field 0.01 cm from the endface

At 0.1 cm from the endface

At 0.1 cm from the endface

At 1 cm from the endface

At 1 cm from the endface

At 10 cm from the endface

At 10 cm from the endface

At 100 cm from the endface

At 100 cm from the endface

The field emerging from the endface is represented exactly at any distance with Hankel transforms

The dialog controlling the evaluation of the emerging field

At 0.1 cm from the endface

At 1 cm from the endface

At 10 cm from the endface

At 100 cm from the endface

4. Plot and view the results

We see that the beam does not diverge significantly until > 1cm from the endface — We see that the beam does not diverge significantly until > 1cm from the endface