Maximizing Reach and Capacity of 100G Optical Networks

Transcription

Maximizing Network Capacity, Reach and Value
Over land, under sea, worldwide
Xtera Communications, Inc.
Maximizing Reach and Capacity of 100G Optical Networks with
Field-Proven Technologies
WDM & Next Generation Optical Networking 2013 – Monaco
19 June 2013
© 2013 Xtera Communications, Inc. Proprietary & Confidential
1
Content
•
Options for Increasing the [Capacity x Reach] Metric
•
What Can be Achieved Today with 100G Technology?
– 22,000-km 100G Deployment
– Long Links in Brazil
– 100G + Raman Technologies for Ultra-Long Spans
•
How Can Terrestrial Solutions Apply to Subsea Cable Systems?
•
Summary
2
Options for Increasing the
[Capacity x Reach] Metric
3
High-Capacity Optical Networking
•
Challenge of managing and supporting increased traffic levels on existing
optical transmission infrastructures
•
Today’s answer:
•
Key objectives: maximizing capacity and minimizing cost per transported bit
100G PM-QPSK coherent technology for Terabit optical
networking
4
Options for Increasing Line Capacity
•
EDFA-constrained line optical bandwidth (about 36 nm)
 The only way to increase line capacity is to increase spectral efficiency at
the line interface card level.
I
I
Bits per symbol
(Increase
constellation size)
Soft-decision FEC
(Increase
coding gain)
01
11
00
10
Q
1101
1001
0001
0101
1100
1000
0000
0001
1110
1010
0010
0110
1111
1011
0011
0111
Q
QPSK
16-QAM
Symbols per
second
(Increase
symbol rate)
Super channel
(Group of denselypacked waves)
Higher cost and/or
complexity on a per
wavelength basis
5
•
EDFA-constrained line optical bandwidth (about 36 nm)
 The only way to increase line capacity is to increase spectral efficiency at
the line interface card level.
I
I
Bits per symbol
(Increase
constellation size)
Soft-decision FEC
(Increase
coding gain)
01
11
00
10
Q
1101
1001
0001
0101
1100
1000
0000
0001
1110
1010
0010
0110
1111
1011
0011
0111
Q
QPSK
16-QAM
Symbols per
second
(Increase
symbol rate)
Super channel
Moderate increase in
the capacity or strong
reach limitation
6
•
There is another dimension which can be explored: line equipment/fiber.
 Silica-based line fiber has a huge bandwidth which is not fully exploited
by traditional EDFA amplifiers.
I
I
Bits per symbol
(Increase
constellation size)
Soft-decision FEC
(Increase
coding gain)
01
11
00
10
Q
1101
1001
0001
0101
1100
1000
0000
0001
1110
1010
0010
0110
1111
1011
0011
0111
Q
QPSK
16-QAM
Symbols per
second
(Increase
symbol rate)
Super channel
Common line equipment
• Broader optical amplifier bandwidth
• Lower-noise amplifiers
• Distributed amplification in the line fiber
to lower the amount of nonlinear effects
• New fiber types (e.g. new subsea builds)
Extra cost shared
by all the wavelengths
7
What Can Be Achieved Today with
100G Technology?
8
22,000-km Network in Mexico
9
CFE Telecom
22,000-km 100G Network on OPGW
Differentiation provided by Raman
optical amplification technology:
• Offering both capacity and
reach
• Bridging long spans with no
need to build new sites
 Up to 2,500-km all-optical link
 Network simpler and faster to
build and operate
Junction node:
Based on
Reconfigurable
Optical Add Drop
Multiplexer
(ROADM)
Hotel node
Junction node
In-line amplifier site
Glass-thru site
NMS/DCN site
10
Mixing Spans and Amplification Technologies
Along a Typical Route (1,350 km)
45 km
ROADM
76 km
135 km
ILA
37 km
ROADM
ROADM
15 km
82 km
ROADM
Super span
250 km – 60 dB
ROADM
3 km 62 km
ROADM
147 km
ILA
25 km
ILA
Super span
170 km
ROADM
Core
Amplifier
137 km
ILA
Backward span
Extension module
Super span
100 km
ILA
30 km
31 km
ROADM
Forward span
Extension module
ROADM
Standard G.652
fiber
11
In the Absence of Long-Span Capability…
45 km
ROADM
76 km
135 km
ILA
ROADM
ROADM
125
km
ROADM
37 km
ILA
125 ROADM
km
Super span
250 km – 60 dB
3 km 62 km
ROADM
170 km
ROADM
Core
Amplifier
Regeneration site
Backward span
Extension module
147 km
25 km
30 km
ILA
ILA
Terminate
the signals at each
end
of the long span (with back-toback terminal equipment)
Super span
Super span
137 km
ILA
82 km
ROADM
Cut the long span in two
ROADM
15 km
100 km
ILA
250 kmROADM
Forward span
Extension module
31 km
Regeneration site
ROADM
Remote Optically
Pumped Amplifier (ROPA)
12
Long Links in Brazil
13
2,300-km network
(OPGW cables)
1,200-km link
14
OPGW Cable and Amazon River Crossing
+
 Towers are about
295m tall (near Eiffel
Tower height) in order
to span 2.5 kilometers
of the Amazon River!
Picture from TIM Brasil
15
OPGW Cable and Amazon River Crossing
Picture from TIM Brasil
16
Ultra-Long Span Routes
(Highest Span Loss: 63 dB)
43 km
ROADM
237 km
ILA
278 km
142 km
ROADM
ILA
138 km
ILA
ILA
235 km
43 km
ROADM
239 km
ILA
110 km
ILA
ROADM
183 km
ROADM
Core
Amplifier
141 km
ILA
157 km
ILA
Backward span
Extension module
91 km
ILA
Forward span
Extension module
229 km
ILA
Standard G.652
fiber
17
1,137-km G.653 DSF Route
(Highest Span Loss: 37 dB)
10 km
ROADM
76 km
123 km
ROADM
ILA
87 km
ILA
Core
Amplifier
125 km
ILA
Backward span
Extension module
ILA
62 km
ROADM
84 km
107 km
ILA
131 km
ROADM
ILA
128 km
138 km
ILA
70 km
ILA
Forward span
Extension module
15 km
ROADM
Standard
G.652 fiber
ROADM
DSF
G.653 fiber
18
Summary
Challenging OPGW link configurations with very long spans between
intermediate sites
Span length (km)
•
300
250
200
150
100
50
0
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
– 16 out of 25 spans exceed 100 km
– 5 out of 25 spans exceed 200 km
– Harsh environments make new sites not an option
•
1,137-km route made of highly-nonlinear DSF G.653 fiber
– Conducive to four-wave mixing degradation
•
100G coherent + Raman enable cost-effective implementation of such links.
19
100G + Raman Technologies for
Ultra-Long Spans
20
Ultra Long-Span Links
•
Lab demonstrations (using commercially-available product):
– Unrepeatered, single-span configuration:
• 34 x 100G on 74 dB / 420 km
• 8 x 100G on 80.8 dB / 480.4 km (presented at OFC/NFOEC 2013)
– Two-span configuration:
• 8 x 100G over 2 spans / 120 dB (presented at OFC/NFOEC 2013)
•
Deployment:
– 70 x 100G design capacity on 350-km cable (65.5-dB EOL loss)
70 wavelengths
Gain from
forward
Raman
pumping
Fiber attenuation
Optical
Supervisory
Channel (OSC)
Gain
from
ROPA
Gain from backward
Raman pumping
Fiber
attenuation
Gain inside
the receive
terminal
21
100G vs. 400G (or 10G!)
•
No demonstration so far of 400G transmission on very long
unrepeatered spans due to high sensitivity on nonlinear effects
•
Beyond 80 dB of cable loss, each dB matters!
•
For very, very long spans, 10G can offer better performance than 100G
in term of line capacity!
•
Example of long unrepeatered links where 100G transmission is not
possible today:
Site A
Site B
450 km, EOL Cable Budget = 86 dB
ROPA
ROPA
Design capacity: 8 x 10G per fiber pair
22
How Can Terrestrial Solutions Apply to
Subsea Cable Systems?
23
Terrestrial Solutions for Subsea Cable Systems
100G + Raman terrestrial technologies for unrepeatered subsea cable
systems
•
Unrepeatered subsea cable system in the Mediterranean Sea
– 70 x 100G design capacity on 350-km cable (65.5-dB EOL loss)
100G technology applied to regional repeatered subsea cable system
•
Submarine route between Alexandria and Mazara del Vallo
– Regional repeatered submarine cable system (about 2,000-km long)
– Long spacing between submerged repeaters
– First 100G repeatered submarine cable system in commercial service
(since Q1 2012)
•
See next slide.
24
Gulf Bridge International
100G Submarine and Backhaul Networks
Milan
• Same platform/technology for
– Submarine route between Alexandria
and Mazara del Vallo
– Backhaul networks in Italy and Egypt
• Span protection for backhaul
networks
Mazara del Vallo
• 8,000 km of 100G optical routes
Alexandria
Working terrestrial route
Protection terrestrial route
Submarine cable system
Zafarana
25
What’s Next?
•
Slight improvements of 100G
technology to bridge 3,000 to
6,000 km
•
Further improvements of 100G
technology to bridge transpacific
distances
– Successful field trial in 2012 on
transatlantic distance
•
Optical subsea repeater with 150-channel capacity
•
Optical and electrical switching for cable systems going PoP to PoP
 Watch out for Xtera’s paper in the Submarine Optical Networking stream
at 12:20 on Thursday!
26
Summary
27
Capacity Performance
With 100G Technology
EDFA-based networks
8
10
12
14
16
6
8
18
4
20
2
22
0
24
Tb/s
Raman-based networks
63-nm bandwidth
10
12
14
16
6
8
18
4
20
2
22
0
100-nm bandwidth
24
Tb/s
10
12
14
16
6
18
4
20
2
22
0
24
Tb/s
28
[Capacity x Reach] Performance
With 100G Technology
EDFA-based networks
8
10
12
14
16
6
8
18
4
20
2
22
0
24
Tb/s
63-nm bandwidth
10
12
14
16
6
8
18
4
20
2
22
0
100-nm bandwidth
24
Tb/s
10
12
14
16
6
18
4
20
2
22
0
24
Tb/s
29
Summary
•
100G technology deployed since 2011:
– First to deploy soft-decision FEC
– Initial 40-nm CMOS technology
– Next product uses 28-nm CMOS
8
•
With rapid traffic growth and improved
economics, 100G is the new 10G
–
–
–
–
•
In multiple applications (including subsea)
Leading to higher volumes
Reducing costs
Also need to recover investment!
10
12
14
16
6
18
4
20
2
22
0
24
Tb/s
100G technology offers 15-Tbit/s line capacity
over 3,000km – Today.
– In real network environments
– Enabled by innovative optical amplification
technologies
– Clear path to 24 Tbit/s on 3,000 km
30
Maximizing Network Capacity, Reach and Value
Over land, under sea, worldwide
31

Maximizing Reach and Capacity of 100G Optical Networks

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