Lasers and Optical Fibres

Optical fibres consist of

• a core inside cladding

• cladding inside a core

Tags

NGSS.HS-PS4-5

The light is...

• totally internally reflected so as to stay in the core

• totally internally reflected so as to stay in the cladding

• refracted to regularly pass between the core and cladding.

• reflected to stay inside the core.

Tags

NGSS.HS-PS4-5

The refractive index of the cladding is

• approximately 1

• much larger than 1

• much smaller than 1

The refractive index of the core is

• approximately 1

• much larger than 1

• much smaller than 1

Tags

NGSS.HS-PS4-3

Modal dispersion is caused by

• light entering the core at slightly different angles, so taking slightly different paths from one booster to the next.

• light having slightly different wavelengths, hence differing speeds in different materials, hence taking slightly different paths from one booster to the next.

• the optical fibres becomng worn, so some light cannot pass through them so quickly

• light from outside the fibre being received by the booster.

Tags

NGSS.HS-PS4-1

Material dispersion is caused by

• light entering the core at slightly different angles, so taking slightly different paths from one booster to the next.

• light having slightly different wavelengths, hence differing speeds in different materials, hence taking slightly different paths from one booster to the next.

• the optical fibres becomng worn, so some light cannot pass through them so quickly

• light from outside the fibre being received by the booster.

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-5

Optical fibres transmit...

• digital signals (where the signal is either on or off for a set period of time)

• analogue signals (where the signal is either on or off for a set period of time)

• digital signals (where the amplitude of the signal is constantly measured)

• analogue signals (where the amplitude of the signal is constantly measured)

Tags

NGSS.HS-PS4-2

NGSS.HS-PS4-5