Fiber TutorialFiber Tutorial

Robert S. CarlisleSystem House Market Development

Robert S. CarlisleSystem House Market Development

IEEE 802.3ah EFM Fiber Tutorial3

How Optical Fibers Work

Two Basic Types of Optical Fiber

Single-Mode

Multimode

n

Index Profilesn

r

r

IEEE 802.3ah EFM Fiber Tutorial4

Single-Mode Optical Characteristics

Coating(245 µm)

Cladding (125 µm)

One Mode of Light

Core (7 - 9 µm)

� Overview� Overview

IEEE 802.3ah EFM Fiber Tutorial5

Transmission Band DefinitionsTransmission Band Definitions

λ1260 1360 1460 1530 1565 1625850

C-Band

Conventional Band1530 -1565 nmDWDM/CWDM

O-Band

Original Band1260 -1360 nmSingle Channel

CWDM

L-Band

Long Band1565-1625 nm

Emerging windowfor DWDM

E-Band

Extended Band1360 -1460 nm

CWDM

S-Band

Short Band1460 -1530 nmFuture window

for DWDM

Non-Zero

Disp

ersion

Shifted

Fiber

(ITU G

.655)

Low W

ater

Peak F

iber

(ITU G

.652.C

)

Standa

rd Sing

le

Mode F

iber

(ITU G

.652)

Multim

ode

Fiber

(ITU G

.651)

IEEE 802.3ah EFM Fiber Tutorial6C

λ

L

CWDM Technology

SEO

1290 1310 1330 1350 1370 1390 1410 1430 1450 1470 1490 1510 1530 1550 1570 1590 1610 λProposed Channel Plan (source CIG)

1550 nm 1570 nmDML Cost Advantages� No cooling required ~ 20nm channel spacing

� ∆ T ~ 0.08 - 0.12 nm/°C shift -- 6 - 8 nm drift� Lower λ tolerance -- 1560 ± 3 nm DML

� higher vendor yields = lower costsλ

drift

IEEE 802.3ah EFM Fiber Tutorial

0.00

0.10

0.20

0.30

0.40

0.50

0.60

0.70

Atte

nuat

ion

[dB

/km

]

20

0

-5

-10

-15

-20

15

10

5

Dis

pers

ion

[ps/

(nm

*km

)]

Wavelength [nm]1280 1320 1360 1400 1440 1480 1520 1560 1600 1640

SMF-28™ &SMF-28e™ Fibers

MetroCor™ Fiber

LEAF® Fiber

SMF-28e™ Fiber

MetroCor™ Fiber

SMF-28™ and LEAF® Fibers

CWDM WINDOWDWDM WINDOW1310 nm

Corning® Single-Mode FibersCorning® Single-Mode Fibers

O-Band E-Band S-Band C-Band L-Band

IEEE 802.3ah EFM Fiber Tutorial8

Baseband System Performance

1

10

100

100 1000 10000

Bit rate

Dis

tanc

e

1490 FP1310 FP

21 km on SMF-28TM fiber

32 km onLEAF® fiber

Fixed losses of 20 dB

1.5 dBm laser

∆λ = 2.8 nm

k = .5

Rx sensitivity = -26 dBm