Advanced Optical Technologies for Data Intensive Applications Kim Roberts iGrid 2005.
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Transcript of Advanced Optical Technologies for Data Intensive Applications Kim Roberts iGrid 2005.
2
How do I optically switch my Lightpaths?
> Need to have each wavelength arriving at a node be able to leave via any of four other optical lines, or drop locally.
> Must be low cost
Local Add Drop
3
Wavelength Selective Switch
> One fiber in, five fibers out.
> Individually cross-connects 80 wavelengths
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Hurdle: Fiber Dispersion Management
ROADM
SMF-28
SMF-28
SMF-28
E-LEAF
E-LEAF
E-LEAF
TWcTWc
PhotonicCross-Connect
PhotonicCross-Connect
PhotonicCross-Connect
Bulk dispersion compensation will not suffice
5
6
8
10
12
14
16
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0 1000 2000 3000 4000 5000 6000
Distance on G.652 fiber (km)
Req
uir
ed O
SN
R (
dB
)Electronic Dispersion Precompensation
OSNR vs. distance (10E-3 BER; 10 Gb/s)
Simple Rx
Tx pre-comp (IM-DD)
3 bit MLSE
Tx pre-comp (DPSK)
5 bit MLSE
GOOD
BAD
Optical Dispersion Compensation is Obsolete
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Transmitter Pre-compensation
Opticalmodulator
laser
D/A
D/A
CD-1
Digitaldata
Recovered data
0
Tx Rx
-30 -20 -10 0 10 20 30
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
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Forward Error Correction
G.975
Wraptor BCH-20
BCH-3
BCH-1
Uncoded
> FEC eliminates Bit Errors
> Lightpaths with no packet loss
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Layer 1 Multicast
OME Up to 160 Gb/s
HDXc Up to 640 Gb/s
HDX Up to 1.28 Tb/s single shelf
3.84 Tb/s as a hub
One layer 1 switch: •50 Mb/s 70,000 ways, •240Gb/s streams 15 ways
Demo US110 (hardware capacity)
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How can I secure my Lightpath?
> Prevent interception of valuable IP or secret information.• Movie production, government, healthcare, finance, corporate
> Preclude alteration or insertion of false data• Banking, government
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Lightpath Encryption Demo US106
> Full OC-192/STM-64 10G throughput.
> One to twelve lightpaths with separate keys.• 12 x GigE used to heavily load the OC-192 as 12xSTS-1-16V
> 400 ns added latency for AES-256 encryption• Another 400 ns for decryption
> Integrated into the Nortel OME-6500 transport shelf.
> Packet by packet encryption• No encryption of idle frames• No overhead added to each packet
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Your Challenge
> Most protocols are designed for lousy connections
> How can you exploit Lightpaths that are:• Wavelength switched to your destination• Independent of optical physics• Free of packet loss• Layer 1 multicast• Securely encrypted• 40 Gb/s