Emerging Optical Transport Technology and Architecture by Suhas Mansingh

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Suhas Mansingh

Sr. Director, Engineering

Converged Optical and Routing Business Unit

Emerging Optical Transport Technology and Architecture


2 2

Ease of Operation

Increase Service Velocity

Enhance Availability

and Resiliency

Reduce / Simplify Planning

and Forecasting

Reduce CAP and OP EX

Need to address the Network not a Box or Layer


40% CAGR 2008-2013

Internet-Video-to-TV is the highest growing Internet category with a CAGR of 150%

Source: Cisco Visual Networking Index—Forecast, 2008-2013


Optics

IP

Transport

40G and 100G

Coherent

400-1TB

Tunable XFP & SFP+

Routing

Services

MPLS

MPLS-TP

ROADM

Metro, Regional, LH

Colorless OmniDir

Flexible Spectrum

Control Plane


CP: Coherent Polarized

Leverages on Polarization Multiplexing to transmit with Lower Baud Rate (e.g. 40Gbps as 10GBaud / 100Gbps as 25GBaud)

Leverages on Coherent Detection and Electronic Post-Processing to provide high tolerance to PMD and CD

DQPSK: Differential QPSK

Differential operating mode provides required system robustness against Laser Cycle Slips

Laser Cycle Slips can be caused by ASE, Laser Phase Noise and XPM (induced by 10G IM/DD channels)

Even w/o 10G channels ASE and Laser Phase Noise can cause Laser Cycle Slips


e.g. 100 Gbps

Capacity with a

25 Gbps Optical

Bandwidth

2+2bit/symbol

QPSK1

‘11’

‘00’

‘01’

‘10’

QPSK2

‘11’

‘00’

‘01’

‘10’

Laser

25Gb/s

QPSK1 Modulator

25Gb/s

100 Gbps = 25 Gbaud 25Gb/s

QPSK2 Modulator

25Gb/s


Direct Detection

Must correct for impairments in the physical domain (insert DCU’s)

Forced to live with non-correctable impairments via network design (limit distance, regenerate, adjust channel spacing)

Coherent Detection

Moves impairment correction from the optical domain into the digital domain

Allows for digital correction of impairments (powerful DSP) vs. physical correction of impairments (DCU’s). Adds advanced FEC.

Massive performance improvements over Direct Detection.

DD

CD

DD

DCU DCU DCU

Regen


1 - O

dd

1- E

ven

2 - O

dd

2 - E

ven

3 - O

dd

3 - E

ven

4 - O

dd

4 - E

ven

5 - O

dd

5 - E

ven

6 - O

dd

6 - E

ven

7 - O

dd

100 G

bp

s

400 G

bp

s

1 T

bp

s

100 G

bp

s

1 T

bp

s

100 G

bp

s

Flex Spectrum ROADM

NO restrictions on Channels Spacing

Modulation Format

Wavelengths with different Bit Rates.

Higher per-channel bit Rates

Control non-linear effects (XPM, FWM)


Zero-Touch Photonic Layer

ANY Modulation

Format

ANY Channel Bit

Rate

ANY Portion of the Optical Spectrum

Contentionless ROADM

ANY Combinatio

n of Wavelength

s to ANY Degree from

ANY Port

Fully Flexible ROADM

Colourless: ANY Wavelength to ANY Add/Drop

port

Omni-Directional: ANY Wavelength to ANY Degree

WSON control plane


ROADM

RX TX RX TX

X

Tunable Laser – Transmit laser can be provisioned to

any frequency in the C-Band.

Colorless – ROADM add ports provisioned in software

and rejects any other wavelengths.

Tunable Receiver – Coherent Detection accepts provisioned wavelength and

rejects all others.

Omni-Directional – Wavelength can be routed

from any Add/Drop port to any direction in software.

Contention-less – In the same Add/Drop device you can add and drop the same frequency to multiple ports.

Flex Spectrum – Ability to provision the amount of

spectrum allocated to each Wavelength allowing for 400G

and 1T bandwidths.

Restoration – Ability to reroute a dangling resource to another path after protection

switch.

Key Values

Complete Control in Software No Manual Movement of Fibers

Increased Service Velocity Control Plane Can Automate Provisioning, Restoration, Network

Migration, Maintenance

Foundation for IP+Optical!!


•Common development with Routing platform

•Fully integrated IPoWDM control plane solution providing Bandwidth on demand

•Network failure reaction

•2nd failure handling

•Multiple SLA options (Bronze 0+1, Super Bronze 0+1+R, Platinum 1+1, Super Platinum 1+1+R)

•Bandwidth addition on the same connection

•New connection setup

•Wavelength reroute for manual restoration

•Alien wavelength (open network)

•Transponder (closed network)

• ITU-T interfaces (segmented network)

Client interface

registration

Wavelength on demand

(Zero planning

wavelength setup)

GMPLS UNI

Optical shared

restoration: 0+1+R and

1+1+R

Emerging Optical Transport Technology and Architecture by Suhas Mansingh

Technology

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