© Ciena Corporation The Path to 100 G Ethernet Martin Nuss VP & Chief Technologist.

© Ciena Corporation

The Path to 100 G Ethernet

Martin Nuss

VP & Chief Technologist

© Ciena Corporation 2

A need for speed: 10GbE, 40Gb, 100GbE

Confidence:We will fill up the bandwidth just like we fill-up disk space and memory


40G Transmission – Current Drivers

40G IP Router interfaces

Link bandwidth requires N X 10G

Problems with link aggregation

Most flows small, distribute nicely

Large flows from MPLS/IPSEC problematic

32-40 Ch DWDM ring exhaust

Multi-access DWDM rings in metro

Typically 5 nodes, some larger

At exhaust build entire new ring

New fiber, amps, ROADMs, installation, space, power,…

Or add a pair of 40G transponders

Both of these applications support 40G transponder costs > 4X 10G transponder cost

Aggregation Group Member

Utilizatio

n


Mix-n-Match of 10G/40G/100G on Same Fiber System

10G

40G

100G (future)

...

Channel 40/80

Channel 1

Mix & Match 10G, 40G and 100G waves on a fiber as needed using similar engineering rules

Low revenue per bit for data will not justify new network overbuilds


Increased Spectral Efficiency, More Capacity

Spectral efficiency: more bits, same fiber system, no forklift upgrade

Higher spectral efficiencyat 100G theoreticallypossible

Spectral Efficiency

0

0.2

0.4

0.6

0.8

1

1.2

2.5G 10G 40G 100G

Bit Rate

b/s

/Hz


Transport technology readinessPossible technology choices for 100G transmission

Parallel options suitable for 100G on dedicated fiber, limited distances

4 X 25G and 10X10G have been proposed

4x 25G VCSEL WDM likely candidate for client-side optics (achievable with CMOS)

Negative service provider reaction to parallel networking solutions in MAN/WAN

Non-scalability of capacity: multiple waves to manage, ROADM port exhaust

Serial options – new technology to improve propagation, spectral efficiency

Trading speed for complexity – starting at 112 Gb/sec

Polarization multiplexing – divide by 2

Each polarization carries a 56 Gb/s signal

Phase coding – e.g.: Four phase states

Four phases encode two info bits

Symbol rate cut in half to 28 Gbaud/sec00 01 10 11


OTN WAN mapping topics

100G OTN (OTU4/ODU4/OPU4) must support mapping of 100GbE

100GbE line rate of 103.125Gbps (results in OTU4 rate of ~112Gbps w/ FEC)

Full transparency required (don’t repeat the mistakes made at 10GbE)

100G OTN must support muxing of ODU1/2/3 to new ODU4 layer

OTU4 line rate above 112Gbps is probably not realizable economically with current technology (means ODU4 support 3xODU3 or 4xODU3 is probably not realizable)

Ciena has proposed to ITU a ~112Gbps OTU4 line rate that supports transparent mappings of 100GbE and muxing of ODU1/2e/3e (allowing transparent mappings of 10GbE and 40GbE) and is moving forward with development of this rate


Economic readiness

Customers would like

40G transponders at 2.5X 10G transponder cost

100G transponders at similar proportional savings

Business case will initially be made based on:

Economic benefit at the overall network solution level

Including CAPEX and OPEX for IP, DWDM and fiber

A reasonable 100G initial economic target: 100G = 2.5 X cost of 40G

Parity in cost/bit, with improved spectral efficiency

Definition of “acceptable” cost ratio with respect to 10G will vary with customer

© Ciena Corporation The Path to 100 G Ethernet Martin Nuss VP & Chief Technologist.

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