L26 Flashcards
1
Q
What is the effective refractive index related to?
(5)
A
The effective refractive index is related to the:
- wavelength
- waveguide geometry
- material
- distribution of the optical mode in the core
- cladding of the waveguide.
2
Q
What are some forms of waveguides?
A
- metal pipes
- waterfalls
- fibres
- integrated photonics.
3
Q
What determines the number of supported modes in a waveguide?
A
Depends on:
- size of the waveguide
- wavelength of light.
4
Q
Give the refractive index for Silicon dioxide and Lithium niobate at certain wavelengths.
A
- Silicon dioxide: 1.4531 (λ = 800 nm).
- Lithium niobate: 2.2111 (λ = 1550 nm).
5
Q
What is the absorption coefficient of Silicon at 600 nm wavelength?
A
The absorption coefficient is 5740 cm⁻¹.
n = 3.95
5737.9
6
Q
What is evanescent coupling used for?
A
Can be used:
- to transfer light between waveguides
- for sensing the environment
7
Q
Describe the Mach-Zehnder Modulator.
add context?
A
Uses electric field distribution and the electro-optic effect for modulation.
of phase?
8
Q
What materials are used in integrated photonics platforms?
A
Materials include:
- Silicon-on-insulator
- Silicon-nitride
- Lithium niobate-on-insulator
