OCS 1-1 intro

Optical Communication Systems

Chapter 1: Introduction

Pham Quang Thai [email protected]

1

Textbooks

Textbooks

[1] G. Keiser, Optical Fiber Communications, 3rd Edition, McGraw-Hill, 2000

References

[2] A. Yariv, Optical Electronics in Modern Communications, 5th Edition, Oxford University Press, 1997

[3] B. Saleh and M. Teich, Fundamentals of Photonics, Wiley, 1991

[4] G. P. Agrawal, Fiber-Optic Communication Systems, John Wiley & Sons, 1992

[5] R. Ramaswami and K. N. Sivarajan, Optical Networks A practical Perspective, 3rd Edition, Morgan Kaufmann Publishers, 2010

[6] J. Powers, Introduction to Fiber Optic Systems, 2nd Edition, McGraw-Hill, 1999

2

Content

Why optical communications?

Evolution of Optical Communication Systems

Applications of optical communications

3

Increasing Need for High-Capacity & Broadband Services

Cisco Forecasts of IP Traffic in 2017 (1 exabyte = 1018 byte) 4

Transport of video on

demand, Internet video

streams and downloads,

and the exchange of

video and other files

through P2P.

Metro traffic will

surpass long haul

traffic

5

Optical Fibers can provide needed solutions

Optical transmission system capacity 6

Optical fiber ~ 1012 Hz bandwidth

~ 10-6 m in diameter

~ 10 kg/km

~ 10-1 dB attenuation

No EMI and crosstalk

Electrical Isolation

Security

Coaxial cable ~ 108 Hz bandwidth

~ 10-2 m in diameter

~ 1000 kg/km

~ 10 dB attenuation

Yes

No

No

7

Evolution of Optical Communication Systems

First laser

First optical waveguide

1960s

Early optical network systems

1970s First

generation

SONET/SDH

1980s

Second generation

WDM

1990s

8

19

70

s Source: LED, Multi-mode laser

Wavelength: 830 nm

Fiber: multi-mode fiber

Fiber length: ~ 10 km

Use repeater

Bit rate: ~ 50 Mbps

19

80

s Source: multi-mode laser, single mode laser

Wavelength: 1310 nm

(MML), 1550 nm (SML)

Fiber: single-mode fiber


Use repeater

Bit rate: ~ 100 Mbps 1 Gbps

19

90

s Source: single mode laser

Wavelength: 8-32 wavelengths



Use amplifier

Bit rate: ~ 2,5 Gbps 2 Tbps

1960: T. Maiman demonstrated first laser at Hughes Research Laboratories.

1966: Kao and Hockham use optical glass fibers for laser light transmission.

9

19

70


Wavelength: 830 nm



Use repeater

Bit rate: ~ 50 Mbps

19

80


Wavelength: 1310 nm




Use repeater


19

90





Use amplifier


1970: Corning Incorporated scientists Drs. Robert

Maurer, Donald Keck, and Peter Schultz invented the

first low-loss optical fiber, 10

19

70


Wavelength: 830 nm



Use repeater

Bit rate: ~ 50 Mbps

19

80


Wavelength: 1310 nm




Use repeater


19

90





Use amplifier


1976: Bell Labs developed first

room temperature semiconductor

lasers.

11

19

70


Wavelength: 830 nm



Use repeater

Bit rate: ~ 50 Mbps

19

80


Wavelength: 1310 nm




Use repeater


19

90





Use amplifier


1987: University of Southampton developed Erbium doped fiber amplifier operating at 1550nm.

12

Applications: entertainment, commercial, military, medical

13

Space division multiplexing and beyond 1Tbps networking in 2014

14

Course content

15

Optical fiber Source Receiver Point-to-Point link

SONET/SDH - WDM

Course outcomes

Correctly interpret and analyze essential photonic devices.

Correctly interpret and evaluate the performance of a single wavelength point-to-point optical link.

Correctly interpret and evaluate the performance of a WDM networks.

Utilizing specialized optical system simulation program such as Optisystem and Matlab, correctly design, simulate and evaluate an optical communication system

16

Assessment Percent Note

Simulations 30% Grade in class

Final project 20% Group project

Final 50% Multiple choice (70~90 m)

17

Documents

OCS 1-1 intro