EMT 354PHOTONIC DEVICES

LECTURE 1:Introduction to Photonic Devices

2WHAT IS PHOTONIC?

WHYPHOTONIC? PHOTONIC

DEVICE

WHAT IS PHOTONIC?

The science of photonics includes the generation, emission,transmission, modulation, signal processing, switching,amplification, and detection/sensing of light. It covers alltechnical applications of light over the whole spectrum fromultraviolet over the visible to the near-, mid- and far-infrared.

PHOTONIC DEVICESPhotonic devices lie at the heart of the communications

revolution, and have become a large and important part of the

electronic/photonic engineering field

APPLICATION

Image

Sensing

Medical

BIO

Nano photonic

Carbon nanotube

Nanosensor

NANO

PHOTONIC DEVICES

Telecommunication

Data storage

Image

Security

Commercial electronic

INFO

A basic photonic device used to split or combine light to or from different fibres.

A building block of passive optical networks.

PHOTONIC DEVICES

COUPLER

PHOTONIC DEVICES

COUPLER

Light-Emitting Diodes (LEDs)

Light-emitting diode (LED) is a semiconductor diode that emits incoherent narrow-spectrum light when electrically biased in the forward direction of the p-njunction.

PHOTONIC DEVICES

LIGHT EMITTING DIODE

PHOTO DIODES (PDS)

Photodiode is a semiconductor diode that functions as a photodetector. It is a p-n

junction or p-i-n structure. When a photon of sufficient energy strikes the diode, it

excites an electron thereby creating a mobile electron and a positively charged

electron hole

PHOTONIC DEVICES

Solar Energy Free

Essentially Unlimited

Not LocalizedSolar Cells Direct Conversion of Sunlight Electricity

No Pollution

No Release of Greenhouse-effect Gases

No Waste or Heat Disposal Problems

No Noise Pollution very few or no moving parts

No transmission losses on-Site Installation

SOLAR CELL

PHOTONIC DEVICES

LASER

PHOTONIC DEVICES

12

Trends in Photonic devices

Long wavelength, high power light sources orphotodetectors

Low cost, easy fabricated materials

High conversion efficiency

Energy saving

PHOTONIC DEVICES