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Submarine Cable System - Focusing on the Link between China & Korea -
Lecture on Submarine Cable System - Focusing on the Link between China & Korea -
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Submarine Cable Systems between Korea and China
Beijing Seoul CKC Taean 0.56Gbit/s x 1WDM x 2FP Qingdao Pusan APCN2 10Gbit/s x 64WDM x 4FP Chongming C2C 10Gbit/s x 96WDM x 8FP As you may know, many submarine cable systems have already instolled all over the world, of course including the link between Korea and China. These days, most submarine cable systems are used for data transmission than voice communication. And some of you are interested in thesubmarine cable system itself. So today, I would like to talk about key technologies to realize the cable system between K&C. KJCN 10Gbit/s x 24WDM x 12FP
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Outline 1. Introduction 2. Configuration of Submarine Cable System
3. Transmission Technologies - Experimental Results 4. How to realize the cable system between Korea and China ? - Network configuration - Cost 5. Conclusion
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Outline 1. Introduction 2. Configuration of Submarine Cable System
3. Transmission Technologies - Experimental Results 4. How to realize the cable system between Korea and China ? - Network configuration - Cost 5. Conclusion
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Repeaterless system and Repeater system
SLTE SLTE Cable MC MC Repeaterless System SLTE : Submarine Line Terminating Equipment MC : Maintenance Controller LME : Line Monitoring Equipment PFE : Power Feeding Equipment SLTE SLTE Repeater There are two kinds of submarine cable system. One is Repeaterless system, the other is Repeater system. As you can see in this figure, the configuration of Repeaterless system is very simple. Repeaterless system consists of SLTE and MC. On the other hand LME PFE Cable PFE LME MC MC Repeater System
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What is “WDM” ? Wavelength Division Multiplexing Total capacity
10Gbit/s x n WDM Wavelength Trans-mitter Recei-ver Trans-mitter Recei-ver Trans-mitter Recei-ver Optical Fiber Multiplexer Demultiplexer
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Advantage of WDM : Upgrade
- Small initial investment - Increase the system capacity when you need without changing the wet plant - After upgrade - Initial Cable capacity : 10Gbit/s x N Trans-mitter Recei-ver Repeater Trans-mitter Recei-ver Trans-mitter Recei-ver
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What is Maximum Number of Wavelength?
10Gbit/s per wavelength Maximum Number of Wavelength Repeater System KJCN Repeaterless System System Length [km]
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Why is the Number of l Limited in Repeaterless System?
Trans-mitter Recei-ver Optical Fiber Trans-mitter Recei-ver Trans-mitter Recei-ver Loss (0.2dB/km) Power Transmitter Receiver Threshold of receiver distance
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> 3T bit/s / cable Upgrade Strategy - Repeater system
- Repeaterless system Cable l Increasing the # FP (Use the dark fibers) Increasing the # wavelength > 3T bit/s / cable
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Outline 1. Introduction 2. Configuration of Submarine Cable System
3. Transmission Technologies - Experimental Results 4. How to realize the cable system between Korea and China ? - Network configuration - Cost 5. Conclusion
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Key Technologies for Repeaterless System
Number of wavelengths : ~16 (Capacity : ~160Gbit/s /fiber) 1~2 (Capacity : 10~20Gbit/s /fiber) - Optical Booster and Preamplifier Optical Booster Optical Pre-amplifier - Raman Amplifier - Remote EDFA Amplifier Remote Pump Source FEC - FEC (Forward Error Correction) Trans-mitter Recei-ver
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Repeaterless System - 10Gbit/s x 100WDM, 200km -
Trans-mitter Recei-ver Optical Fiber Multiplexer Demultiplexer 100WDM 200km BER : 10-9 Spectrum after 200km transmission Transmission characteristics
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Key Technologies for Repeater System
Fiber (~100km) FEC Recei-ver 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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Repeater System - 10Gbit/s x 200WDM, 9200km -
Trans-mitter Recei-ver Trans-mitter Recei-ver Trans-mitter Recei-ver Trans-mitter Recei-ver Trans-mitter Recei-ver Trans-mitter Recei-ver Trans-mitter Recei-ver Trans-mitter Recei-ver Trans-mitter Recei-ver Trans-mitter Recei-ver Trans-mitter Recei-ver Trans-mitter Recei-ver Trans-mitter Recei-ver Trans-mitter Recei-ver Trans-mitter Recei-ver Trans-mitter Recei-ver Trans-mitter Recei-ver Trans-mitter Recei-ver Trans-mitter Recei-ver Trans-mitter Recei-ver Trans-mitter Recei-ver Repeater Fiber (~45km) BER BER : with super FEC Output of Transmitter After 9,200km Transmission
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Outline 1. Introduction 2. Configuration of Submarine Cable System
3. Transmission Technologies - Experimental Results 4. How to realize the cable system between Korea and China ? - Network configuration - Cost 5. Conclusion
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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 !
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Network Configuration
Plan the optical cable system between Korea and China using the Existing cable landing stations. Taean (泰安) - Qingdao (青島) Distance : ~ 560km Taean : Exist. Qingdao : Exist. 560km 3 options of Network configuration
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Network Configuration
Repeater System Option 1 Repeaterless System Option 2 New Station Taean : Exist. Repeaterless System + Backhaul System Option 3 Qingdao : Exist.
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Conditions for Cost Estimation
Initial After Upgrade Note: 5 Repeaters are assumed in Repeater system (Option 1).
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Cost for Initial Investment
Price(M$) Initial
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Cost for Upgrade After Upgrade (Ultimate)
Price(M$) After Upgrade (Ultimate) Initial
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Terminal Equipment Bay
Repeaterless System EDF for remote amplification LTU with FEC for undersea cable system WTU Up-stream Remote EDF Pump Source Down-stream 1FP LTU : Line Terminating Unit WTU : Wavelength Terminating Unit Repeater System LTU (compatible with terrestrial LTU) WTU Down-stream 1FP Up-stream Repeater
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The Number of Terminal Bay
Repeater System LTU Bay Cable Qingdao Taean Repeaterless System Twice ! Quigdao Taean New Station
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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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