kddi-scs p.1 koren/apan-kr 2002 next generation internet workshop may 25, 2002 kddi-scs proprietary...

May 25, 2002

KDDI-SCS ProprietaryUse Pursuant to Company Instructions

KDDI-SCS

P.1

KOREN/APAN-KR 2002Next Generation Internet Workshop

Submarine Cable System - Focusing on the Link between China & Korea -

Noriyuki Takeda and Junji Matsuda KDDI Submarine Cable Systems Inc. (KDDI-SCS)

May 25, 2002


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Submarine Cable Systems between Korea and China

CKC

APCN2

C2C

KJCN

Beijing

Seoul

Pusan

Taean

Qingdao

Chongming

0.56Gbit/s x 1WDM x 2FP

10Gbit/s x 64WDM x 4FP



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Outline

1. Introduction2. Configuration of Submarine Cable System3. Transmission Technologies - Experimental Results4. How to realize the cable system between Korea and China ? - Network configuration - Cost5. Conclusion

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Outline


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Repeaterless system and Repeater system

SLTE SLTECable

MC MC

SLTE

MC

PFE

MC

SLTE

Cable

Repeater

Repeaterless System

Repeater System

SLTE : Submarine Line Terminating EquipmentMC : Maintenance ControllerLME : Line Monitoring EquipmentPFE : Power Feeding Equipment

LME PFE LME

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Trans-

mitter Recei-v

er Trans-

mitter Recei-v

er Trans-

mitter Recei-v

er Trans-

mitter Recei-v

er Trans-

mitter Recei-v

er

What is “WDM” ?

Wavelength DivisionMultiplexing

Optical Fiber

Trans-

mitter Recei-v

er Trans-

mitter Recei-v

er Trans-

mitter Recei-v

er Trans-

mitter Recei-v

er Trans-

mitter Recei-v

er Trans-

mitter Recei-v

er

Wavelength

Multiplexer Demultiplexer

Total capacity

10Gbit/s x n WDM

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Advantage of WDM : Upgrade

- Initial- After upgrade

Trans-

mitter Recei-v

er Trans-

mitter Recei-v

er Trans-

mitter Recei-v

er Trans-

mitter Recei-v

er Trans-

mitter Recei-v

er Repeater

Trans-

mitter Recei-v

er Trans-

mitter Recei-v

er Trans-

mitter Recei-v

er Trans-

mitter Recei-v

er Trans-

mitter Recei-v

er Trans-

mitter Recei-v

er

Upgrade : - Small initial investment - Increase the system capacity when you need without changing the wet plant

Cable capacity : 10Gbit/s x N

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What is Maximum Number of Wavelength?

System Length [km]

Max

imum

Num

ber

of

Wav

elen

gth

10Gbit/s per wavelength

0

50

100

150

200

100 200 300 400 500 600

RepeaterlessSystem

Repeater System

KJCN

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Why is the Number of Limited in Repeaterless System?

Trans-

mitter Recei-v

er Trans-

mitter Recei-v

er Trans-

mitter Recei-v

er Trans-

mitter Recei-v

er Trans-

mitter Recei-v

er Trans-

mitter Recei-v

er Trans-

mitter Recei-v

er Trans-

mitter Recei-v

er Trans-

mitter Recei-v

er Trans-

mitter Recei-v

er Trans-

mitter Recei-v

er

distance

Pow

er

Optical Fiber Repeater

Transmitter Receiver

Threshold of receiver

Loss (0.2dB/km)

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Upgrade Strategy

> 3T bit/s / cable

Increasing the # wavelength

- Repeater system

Increasing the # FP(Use the dark fibers)

- Repeaterless system

Cable

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Outline


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Key Technologies for Repeaterless System

Number of wavelengths :

- Raman Amplifier- Remote EDFA Amplifier

Remote

Pump Source - Optical Booster and Preamplifier

Optical Booster Optical Pre-amplifier

1~2 (Capacity : 10~20Gbit/s /fiber)

FEC

FEC

- FEC (Forward Error Correction)

Trans-

mitter Recei-ver

~16 (Capacity : ~160Gbit/s /fiber)

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Spectrum after 200km transmission

0.1nm Resolution

-40

-30

-20

-10

0

1540 1545 1550 1555 1560 1565

Wavelength [nm]

[dB

m]

Repeaterless System - 10Gbit/s x 100WDM, 200km -

10

12

14

16

18

20

22

1540 1545 1550 1555 1560 1565

Wavelength [nm]

Q-f

acto

r [d

B]

Transmission characteristics

BER : 10-9

Trans-

mitter Recei-v

er Trans-

mitter Recei-v

er Trans-

mitter Recei-v

er Trans-

mitter Recei-v

er Trans-

mitter Recei-v

er Optical Fiber

Trans-

mitter Recei-v

er Trans-

mitter Recei-v

er Trans-

mitter Recei-v

er Trans-

mitter Recei-v

er Trans-

mitter Recei-v

er Trans-

mitter Recei-v

er Multiplexer Demultiplexer

100WDM 200km

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Key Technologies for Repeater System

Repeater Fiber (~100km)

FEC

Recei-ver

FEC

Trans-

mitter

How to transmit a large number of wavelength……..

1. By making the signal bandwidth wider 2. By making the wavelength spacing narrower

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Recei-ver Recei-ver Recei-ver Recei-ver Recei-ver Recei-ver Recei-ver Recei-ver Recei-ver

Trans-

mitter Trans-

mitter Trans-

mitter Trans-

mitter Trans-

mitter Trans-

mitter Trans-

mitter Trans-

mitter Trans-

mitter

-50

-45

-40

-35

-30

-25

-20

-15

-10

1530 1550 1570

Wavelength (nm)

Pow

er (

dBm

)

-50

-45

-40

-35

-30

-25

-20

-15

-10

1530 1550 1570

Wavelength (nm)

Pow

er (

dBm

)

Output of Transmitter After 9,200km Transmission

Repeater

Recei-ver

Trans-

mitter Trans-

mitter Trans-

mitter Trans-

mitter Trans-

mitter Trans-

mitter Trans-

mitter Trans-

mitter Trans-

mitter Trans-

mitter Trans-

mitter Trans-

mitter

5

6

7

8

9

10

11

12

13

0 20 40 60 80 100 120 140 160 180 200

Channel number

Q-f

acto

r (dB

)

BER : 10-9 with super FEC

Recei-ver Recei-ver Recei-ver Recei-ver Recei-ver Recei-ver Recei-ver Recei-ver Recei-ver Recei-ver Recei-ver

9,200km

Repeater System - 10Gbit/s x 200WDM, 9200km -

200WDM

Fiber (~45km)

BE

R

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Outline


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Key Factors to Realize the System

- Demand- Feasibility of transmission technologies- Location of cable landing station- Network configuration- Cost

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Comparison of New and Existing Cable Landing Station

Using the Existing Stations is preferable !

New Landing Station Existing Landing Station

Backhaul System New BH systems are required Available to use exist. One

Construction Cost Expensive(10M$-7M$) --

Lead Time Long (about one year) Shorter

Permission Owner's responsibilities

1. Governmental Authorities approvals a) to land a submarine cable, b) of operation and maintenance2. Route Permits, occupancy permits3. Pipeline crossing agreements.4. In-service cable crossing notifications.5. OOS cable removal notifications6. Permits for any duct route construction7. Right-of-Ways for any land crossings8. Agreements with fishermen's unions9. Environmental studies

1. Governmental Authorities approvals a) to land a submarine cable, 2. Route Permits, occupancy permits3. Pipeline crossing agreements.4. In-service cable crossing notifications.5. OOS cable removal notifications

8. Agreements with fishermen's unions9. Environmental studies

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Network Configuration

Taean ( 泰安 ) - Qingdao ( 青島 )

Plan the optical cable system between Korea and China using the Existing cable landing stations.

Distance : ~ 560kmTaean : Exist.Qingdao : Exist.

560km

3 options of Network configuration

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Qingdao : Exist.

Taean : Exist.

Network Configuration

New Station

Repeater System

Option 1

Repeaterless System

Option 2

Repeaterless System +Backhaul System

Option 3

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Conditions for Cost Estimation

Initial

After Upgrade

# WDM Bit rate/ # Fiber Pair Total CapacityRepeater System

(Option 1)Repeaterless System

(Option 2)Repeaterless System

+ Backhaul(Option 3)

5 10Gbit/s 1 50Gbit/s / Cable

# WDM Bit rate/ # Fiber Pair Total CapacityRepeater System

(Option 1)96 4

Repeaterless System(Option 2)

Repeaterless System+ Backhaul(Option 3)

3.84Tbit/s / Cable488

10Gbit/s

Note: 5 Repeaters are assumed in Repeater system (Option 1).

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Cost for Initial Investment

Price(M$)

Initial

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Cost for Upgrade

InitialAfter Upgrade

(Ultimate)

Price(M$)

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Terminal Equipment Bay

EDF for remote amplification

LTU with FECfor undersea cable system

WTUUp-streamWTU

Remote EDF

Pump Source Down-stream

Remote EDF

Pump Source

1FP LTU with FECfor undersea cable system

LTU : Line Terminating UnitWTU : Wavelength Terminating Unit

Repeaterless System

LTU(compatible withterrestrial LTU)

WTU

Down-stream

1FP

WTUUp-streamRepeaterLTU(compatible withterrestrial LTU)

Repeater System

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The Number of Terminal Bay

Repeater System

Repeaterless System

Qingdao Taean

TaeanQuigdao New Station

Cable

Twice !

LTU Bay

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Conclusion

- Configuration for Repeater system and Repeaterless system were presented.

- The three options of system between Korea and China were shown.

- From the standpoint of the cable capacity and cost, Repeater system is more attractive for the system between Korea and China.

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Please visit out web site!

KDDI-SCS Home page : http//www.kddiscs.co.jp

N.Takeda (Technical) : [email protected] J.Matsuda (Commercial) : [email protected]

Thank you!

kddi-scs p.1 koren/apan-kr 2002 next generation internet workshop may 25, 2002 kddi-scs proprietary...

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