Flexible high speed optical interfaces enabled in Nordic ... · Ioan Turus Stockholm, 10.10.2019...

Ioan Turus

Stockholm, 10.10.2019

Netnod Meeting 2019

Flexible high speed optical interfacesenabled in Nordic backbone

© 2019 ADVA Optical Networking. All rights reserved. Confidential.22

Railway infrastructure

• Development of new trains vs development

of new tracks and signaling systems

• Proprietary systems

• Regulations

Integrated transport systems in optical networks and not only …

https://www.networkrail.co.uk/stories/infrastructure-insights-signalling/

http://www.heser.si/en


Road infrastructure

• Development of new cars

vs development of new roads

• Open systems

• Open capacity distribution

The example of disaggregated transport systems given by road infrastructure

https://finance.yahoo.com/news/tesla-stock-unsustainable-free-supercharging-121628106.html?

https://www.rover.com/blog/tesla-dog-mode/

http://homelandnewsng.com/economy/5668-federal-road-infrastructure-

things-know-about-new-road-trust-fund


This will change going forward …

Optical networks so far …

Fixed optical layer• Rigid channel grid

• Limited reconfiguration

Fixed interfaces• Fixed data rate

• Fixed modulation & FEC

• Fixed bandwidth

Static connectivity• Permanent connections

• (Semi-)manual set-up

ch. #1 #2 #3 #4 #5

fixed

10 40 100 Gbps

50GHz 50GHz 50GHz

100G40G

10G


Outline

Why do we need disaggregated optical networks1

2 Advances in optical communications

Spectrum services in a commercial Nordic long-haul network 3

6 © 2019 ADVA Optical Networking. All rights reserved. Confidential.

Why do we needdisaggregated optical networks


• Triggers innovation and evolution

• Accommodates different lifecycles

• Enables flexibility to deploy best-in-class

equipment for all network needs

• Facilitates multi-vendor environments

• Avoids implementation lock-ins

• Integrates into open-source and commercial

orchestration systems

Disaggregation benefits

New open terminals provide the required flexibility for use in disaggregated networks

Disaggregating networks

Partial disaggregation: terminal and OLS as separate elements

Different lifecycles of optical components

OLSTerminal Terminal

Value

Optical line system

Fiber

3 years+ 10 years+

Transponder

Depreciation

flexible

open

terminal

flexible

open

terminal


Disaggregation

Integrated

Transport System

Disaggregated

Terminal and OLS

Disaggregated

Elements

Increasing

level of

disaggregation

and customer

effort for

integration

From Integrated Networks to Disaggregation of Terminal and OLS


Standard Interfaces and Disaggregation

Disaggregated Network Architecture

• Metro and Core OLS for any current and future interface

• Terminals over any optical layer (Metro, Core, Submarine)

• Element integration and disaggregation options

Open Programmatic Control

• SDN APIs with standardized YANG models

Standard Data Interfaces

• Interoperating services with open client pluggability

• OTN for open switching and grooming

Enabling Open Networking

Open Architecture


Advances in optical communications


Next generation optical layer aspects

but can be simplified via focus on the most relevant items

What we call a “DWDM Wavelength”


Dependency between modulation scheme, bit rate, reach

Some background for understanding analog optics

Terminal Optical Amplifier Optical amplifier Terminal

• Singal-to-Noise

ratio degradation

through optical

amplifiers

• Higher order

modulation

schemes

• Symbol rates

Higher symbol-rate (e.g. 69Gbaud) Slower symbol-rate (e.g. 25Gbaud)


• High speed/acceleration

• Short reach (high fuel consumption)

• Average speed/acceleration

• Long reach (low fuel consumption)

Trade-off speed vs. reach (modulation challenge)

Analogy cars vs advanced open terminals

https://www.autoblog.com/volkswagen/passat/ https://auto.ndtv.com/ferrari-cars/portofino


Increasing capacity by adding more bits in a symbol at the cost of distance limitation

More constellation points lead to higher OSNR sensitivity

Multi-level Modulation


• Low capacity

• Increased flexibility

(many units)

• High capacity

• Low flexibility

(few units)

Trade-off capacity vs. flexibility (baudrate challenge)

Analogy trains vs advanced open terminals

https://www.quora.com/What-are-the-different-types-of-trains-in-India https://www.railmagazine.com/news/network/grayling-i-want-the-first-

hydrogen-train-to-operate-on-our-rail-network-within-a-short-period-of-

time


Higher baud-rate, higher data rate, more spectrum resources needed, same distance

Increasing the baud rate increases the required spectral bandwidth proportionally

Baudrate translated into spectrum requirements


Flexgrid optical layer

Each spectrum slice defined by

• Central frequency: 193.1 THz + (”n” * 6,25GHz)

• Slice width: ”m” * 12.5 GHz

Maximum number of channels:

- 96 (at 50GHz spacing)

- 192 (at 25 GHz spacing), etc

Center frequency range: 196.00 – 191.25 THz

Center frequency grid: 6.25 GHz

fixed

from fixed grid to flexgrid - definition

flexSpectrum slices

Center Frequencies

Channel width 50 GHz fixed

Maximum number of channels: 96

Center frequency range: 196.00 – 191.25 THz

Center frequency grid: 50 GHz

50GHz 50GHz 50GHz6,25GHz

f=193.1THzn=0n=-5n=-9 n=+8

n=+8 (i.e. 193.1 THz + 8*6.25GHz)m=4 (i.e. 4*12.5=50GHz)

n=0m=3 (37.5 GHz)


Optimization potential by applications

Modulation scheme, bit rate, reach

Lower cost per bit

Metro ptp

DCI

Metro Core

LH Core

280km @ 600G

>6000km @ 200G

Constellation governs reach @ flexgrid

(same spectral density)

Adding Raman provides further reach

Enabling multi-haul networks


840Gb/s

gross rate

600G payload

Higher Order Modulation (QAM)

Increasing Baud rate provides highest reach

DSP Technology

4bit/symbol* 6bit/symbol 8bit/symbol 10bit/symbol 12bit/symbol

30 G Symbols/s 70 G Symbols/s

Phase

modulation

Baud ratesimilar noise

performance for

Flexgrid (keeping

spectral density)

requires 3dB better

OSNR per step

* Two polarizations


Spectrum

Interleaving of symbols

Interleaving removes steps in optimization

Advanced open terminals enabling ultra flexible modulation

8QAM

16QAM

32QAM

64QAM

Symbolrate (GBd)

noise

penalty

35 69

Interleaved modulation

removes performance steps16QAM

32

QAM 16QAM

32

QAM 16QAM

32

QAM

power

time

Example:

Four QAM setting options for 300G

42 52

Continuous bandwidth setting for

close adaption to filter passbands

No overlap

(no error)

= same noise

Overlap ==

ERROR!

8 bit/symbol

10 bit/symbol

12 bit/symbol

9.5 bit/symbol


Spectrum services in a commercial Nordic long-haul network


Unleashing the virtually unlimited capacity of optical fiber

The way forward to manage and monetize optical network resources.

Optical spectrum services

Open Optical Line System (OOLS)Optical

Terminal

Optical

Terminal

λ

Spectrum

Slice l


Terminal

Zero-touch operation of spectrum services over multiple domains.

Spectrum services - The path forward

OLS domain B

Domain

Controller

Domain

Controller

Open, vendor-independent end-to-end control

OLS domain A

Spectrum gateway

Open Network APIs

Terminal

Op

en

Devic

e A

PI

Op

en

Devic

e A

PI

flexible open

terminalflexible open

terminal


100G+ spectrum services in a commercial LH networkLive demonstration at TNC 2019, Tallinn, Estonia

Netconf/Yang Netconf/Yang

Optimum

configuration

Optimum

configurationAutomation

Live long-haul network

Spectrum Service

A-Z lightpath

BWopt

GSNR

PTX

PRX

Spectrum Service

A-Z lightpath

BWopt

GSNR

PTX

PRX

Open Line System (OLS)

SDN-controlled automation

Permanent tracking of performance data, e.g., optical receive power, SNR, Q-factor

Automated adjustment triggered by changes in performance

When performance values fall below thresholds, the modulation format changes

flexible open

terminal

flexible open

terminal


Full set-up

Tallinn

Warsaw

2943km

Poznan

3751km

Groß Köris

4488km

Salaspils

1016km

Kruonis

1792km

Frankfurt

5738km

Vilnius

2004km

Configurable

loopbacks FSP3000 flexgrid

production network

400GHz

spectrum serviceflexible open

terminal


Exploiting un-tapped system margin to maximize capacity.

Demo workflow

Optimum format:

• Highest l-capacity

• Best spectral efficiency

• Sufficient margin

Set-up optical lightpath

Probe channel with 200G DP-QPSK reference signal

Retrieve flexible open terminal telemetry data

Calculate generalized path OSNR (GOSNR)

Determine optimum modulation format based on GOSNR


Optimizing capacity and spectral efficiency.

Demonstrated performance

Distance Capacity

/carrier

Format Bits/symbol

1016km 500G 32QAM 5

1792km 400G 16QAM-32QAM 4.5

2943km 300G SP-16QAM-16QAM 3.5

3751km 300G SP-16QAM 3

5738km 200G QPSK/DP-P-16QAM 2.5


Transport module performs

• High speed multiplexing

• Modulation/ demodulation

• Client and network monitoring

• ODU tributary mapping

Using NETCONF

How does reconfiguration work?

Fiber attenuation increases→ Optical performance value

drops below threshold•Client mapping and 600G

(64QAM) transport connection

are deleted

•New 400G (32QAM) transport

connection is created and

client mapping restored

System now running at 400G

(32QAM)

Fiber attenuation decreases→ Optical performance value

rises above threshold

•Client mapping and 400G

(32QAM) transport connection

are deleted

•New 600G (64QAM) transport

connection is created and

client mapping restored

System running at 600G

(64QAM)

flexible open

terminal


Communication between optical and application layers for optimizing traffic flow

Enabling new applications - optical restoration

Original working path: 300 Gbps

Restored path: 200 Gbps

1. Original working path

allows for 300 Gbps

2. Fiber break in working

path

3. Optical restoration

leads to longer path

4. Restored path

supports 200 Gbps

only


Key take-away points

• Dissagregation of optical transport networks, allowing faster inovation of open terminals.

• State-of-the-art coherent transceivers today enable a flexible reconfiguration from

100Gbps to 600Gbps per wavelenght.

• From reconfiguration of 200Gbps over 5700km to 500 Gbps over 1000km we demonstrate

the advantages of dissaggregation and easiness of introduction of open terminals in a

comercial Nordic long haul network.

• Enabling new applications, new businesses and new streams of revenue.

https://enacademic.com/dic.nsf/enwiki/1171621

https://www.telegraph.co.uk/cars/volvo/60-

years-of-the-volvo-amazon/

https://www.volvoofhalifax.com/inventory/new-2018-volvo-v90-

cross-country-base-awd-station-wagon-yv4102nk2j1013383

https://www.theverge.com/2017/11/24/16695926

/tesla-electric-semi-truck-price

https://www.ukinvestorshow.com/investor-

hub/autonomous-cars-hailed-for-uk-economy-boost/

Thank you

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Flexible high speed optical interfaces enabled in Nordic ... · Ioan Turus Stockholm, 10.10.2019...

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