inspace project progress and...

SPATIAL‐SPECTRAL FLEXIBLE OPTICAL NETWORKING: ENABLING SOLUTIONS FOR A SIMPLIFIED AND EFFICIENT SDM

SPECIFIC TARGETED RESEARCH PROJECT (STREP) INFORMATION & COMMUNICATION TECHNOLOGIES (ICT)

INSPACE Project progress and achievements

Dr. Ioannis TomkosINSPACE project Technical Manager

EC premises, Brussels, Belgium

1 March 2016

Concertation Meeting

2Concertation meeting – Brussels, 1 March 2016

Historical evolution of optical communications system capacity and bit‐rate distance product

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WDMTDMOFDM/CoWDMCoherent DetectionSpatial MultiplexingTotal capacity

• Traffic increases at a rate of 20-40% per year, while

capacity of deployed SMF-based networks approaches

fundamental limits…

• Fiber bandwidth was considered for many years as an abundant resource, but we have almost utilized to the maximum extent the EDFA amplifiers bandwidth (i.e. while approaching the fundamental SE limits)

• A short-term solution is to utilize the available fiber spectrum more efficiently/wisely as is the case in wireless networks where bandwidth was always a limited/scarce resource - (Spectrally flexible systems/networks)• A forward-looking option is to deploy new fibers (or use strands of available SMF fibers) that can support multi-cores or/and multi-modes per core (SDM/Spatially-flexible systems/ networks)

Data from Prof. Andrew Ellis


What’s next in capacity expansion… In Space

Space is the obvious yet unexplored (until 2009) dimension• …BUT by simply increasing the number of systems, the cost and power consumption also

increase linearly!

Efficient use of the space‐domain requires “spatial integration of elements”* • Significant efforts in the development of FMF and MCF (fibre integration)

• Multi‐link amplification systems have also been proposed and developed

• Tx/Rx integration is a hot and very active topic

• Optical switches are largely unexplored so far (INSPACE focus!)

MC/FM EDFA/EDFA array

MCF/FMF/Bundle of SMF

Tx PIC Rx PIC

* Peter J. Winzer, “Spatial Multiplexing: The next frontier in network capacity scaling”, Tutorial paper at ECOC 2013


Evolution from spectrum flexible to space (& spectrum) flexible optical networking

Spectrum based BW allocation

Space & Spectrum based BW allocation

Spectrum Flexible Optical Networking‐ Combined selection of channel bandwidth (format/ data rate) and spectral allocation according to: demand, distance and required performance‐ λ + format/rate tunable TxRx‐ Flexible switching of variable spectral slots at different wavelengths‐ Optimized spectral usage

Spatially (and Spectrally) Flexible Optical Networking

‐ Extend flexibility to the space switching domain‐Multi‐dimensional switching granularity ‐ Channel allocation over a. multiple Modes/Cores/fibresb. multiple spectral slots

‐ Optimized system bandwidth usage ‐ Combined spectral – spatial optimization.‐Multi‐dimensional flexible switching ‐ New concept of joint switching


The INSPACE project consortium

Optronics Technologies S.A• Mr. George Papastergiou (Coordinator)• Dr. Nina Christodoulia• Dr. Thanasis Theocharidis

Telefónica Investigación y Desarrollo SA

•Mr. Felipe Jiménez‐Arribas (WP2 Leader)• Dr. Víctor López• Dr. Óscar González de Dios

The Hebrew University of Jerusalem • Prof. Dan Marom (WP4 Leader)• Dr. Miri Blau

Athens Information Technology• Dr. Ioannis Tomkos (Technical Mngr)• Dr. Dimitrios Klonidis (WP6 Leader)• Dr. José M. Rivas‐Moscoso• Mr. Behnam Shariati

Optoscribe Ltd.

CREATE‐NET (Center for Research and Telecommunication Experimentation for Networked Communities)

Aston University

Finisar Israel Ltd.

W‐ONE SYS SL

• Dr. Nicholas Psaila• Dr. John MacDonald• Dr. Paul Mitchell • Dr. Domenico Siracusa (WP5 Leader)• Dr. Federico Pederzolli• Dr. Elio Salvadori• Prof. Andrew Ellis (WP3 Leader)• Dr. Stylianos Sygletos• Dr. Naoise Mac Suibhne• Dr. Filipe Ferreira• Dr. Christian Sánchez‐Costa• Dr. Shalva Ben‐Ezra • Dr. Jordi Ferré Ferran (WP7 Leader)• Dr. Jaume Mariné


INSPACE project channel allocation concept

Modes/Cores

Wavelengths

Data rate(Modulation level)

Degrees of Flexibility

Modesor

Cores

f

f

f

f

f

• Channels with flexible capacity can be allocated over:– one or few modes/multi cores – a single or multiple spectral slots

: end-to-end allocated channel

“Spatial expansion of the spectrum over multiple modes/cores and therefore definition of a superchannel over two dimensions (instead of the spectrum only dimension)”

SMF-Bundle

orFMF

orMCF

N‐WDMor

OFDMorSC‐M‐QAM

Fibre, Mode,Core


SDM switching classification

Independent spatial/spectral channel switching Spectral channel switching

Spatial channel switching Spectral channel switching of spatial subgroups

* D. M. Marom et al.,''Switching Solutions for WDM-SDM Optical Networks'', IEEE Comm. Mag. 53, 60-68 (2015)


SDM Switching options

8

• Implementations of SDM switching for various granularities:Joint switchingRequired WSS: 2 × 1 × (MN‐1)

Core-shuffle independent switchingRequired WSS: 2M× 1 × (MN‐1)

Fractional joint switchingRequired WSS: (2M/P) × 1 × (PN‐1)

M: Number of cores/modesN: Number of node directionsP: Number of cores/modes per group in fractional joint switching

Independent switchingRequired WSS: 2M× 1 × (N‐1)


High port count WSS for joint switching of spatial fibers/cores/modes

INSPACE SDM‐capable Wavelength Selective Switches

A conventional 120 WSS can be turned into a 7-mode(12) spatial-spectral WSS!

New port definition: S(MN)

S = nº of spatial modes

In1

Out1

Out2 M = nº of input fibre subgroupsN = nº of output fibre subgroups


SDM technology elements

INSPACE SDM Wavelength Selective Switch• High port count WSS for joint switching of spatial modes

By adding a 2‐D SMF array, a higher port count can be achieved

With a fibre array of 316 (functional) fibres, a 3‐mode(115) spatial spectral high port count WSS has been designed/fabricated

S modes per input/output

M = 1 inputN outputs

2-D Fibre array


SDM technology elements

Mode/Cores MUX/DEMUX are needed • MCF to SMF breakout designed and fabricated

• FMF photonic lantern designed and fabricatedThe performance of the photonic lantern (loss of just 2 dB max with a loss uniformity of 0.8 dB) is better than competing commercial devices and fully packaged devices are ready to be deployed. These were launched as a product at ECOC’15.


Techno‐economic evaluation of the performance of different SDM switching schemes and spectral/spatial super‐channel allocation policies, taking into account the spectral efficiency/reach trade‐off

First study carried out for SDM networks based on simple SMF bundles (realistic option considering the large number of deployed SMFs per cable)

SDM resource allocation issues

• as MCFs and FMFs with coupled transmission cores/modes still present special challenges in terms of their physical layer performance and implementation complexity


Typical resource optimization process


Results on performance comparison of different switching paradigms ‐ I

Different SDM switching alternatives are compared in a network planning scenario for the Telefónica Spain national network assuming bundles of 12 SMFs across all links

The left‐hand figure presents the spectrum utilization per fibre per network link, while the right‐hand figure presents an alternative visualization of the results in terms of the percentage of spectral penalty The performance of J‐Sw and FrJ‐Sw is seen to converge to that of Ind‐Sw when the traffic load in the network is high enough:

Percentage of spectral penalty due to group switching.Average occupied spectrum per link per fiber

Results to be presented at OFC’16 - Collaboration with Telefónica, UPC & Finisar


Number of WSSs and ports for the SDM switching paradigms

Joint switching enables significant cost savings compared to independent switching due to the reduction in the number of required WSSs Of course considering J‐Sw and large S, WSSs with very high port count

(HPC‐WSS) are required, which will increase the cost but not as much as it will be the case with increased number of WSSs

Assuming a route‐and‐select (R&S) ROADM architecture with nodal degree D, the following number of ports are required for each switching scenario: (Number of WSS for add/drop stages are not considered)

switching type

port count per WSS

number of WSS per degree

port count per WSS for bundles of 12 SMFs, G=3, and D=5

number of WSS for bundles of 12 SMFs, G=3 per degree

Ind-Sw 1×D S (1×5) 12FrJ-Sw G×(1×D) 2·S/G 3×(1×5) 8J-Sw S×(1×D) 2 12×(1×5) 2

S: number of fibers, D: nodal degree, G: the number of spatial modes in each subgroup


INSPACE SDN controller architecture

Network Abstraction Module (NAM)

North‐bound Communications Manager (NCM)

Topology Service (TS)

TDB

South‐bound Protocol Manager (SPM) #1

Optical NodeCP Agent



Client Application

…Client Application

Client Application

TED Manager (TM)

PCE / RSSA Engine (PRE)

Virtualization Engine (VE)

Connection Manager (CM)

CDB

VDB

South‐bound Protocol Manager (SPM) #2

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Standardization activities

Contribution to: SG15 – Q6Q6 – “Characteristics of optical systems for terrestrial transport networks”

• 30 min presentation in SG15 meeting: 15‐16 Feb, Geneva• Presented by TID (Óscar Gonzalez de Dios), in collaboration with and

the support of: NTT, KDDI• Presentation Title:

Concepts and terminology for Spatial Division Multiplexing (SDM) networks• Main purpose:

To initiate the discussions on SDM technologies for future standards

Results:• Large number of attendees. Topic received increased interest!• Long (and tough!) discussions with Q6 experts reached an agreement

to include SDM in several study items of ITU‐T SG‐15 WP2 questions … BUT don’t push for a standard now (i.e. ahead of technology maturity).

• However, SG15 must keep track of SDM and include discussion in ITU‐T meetings


Relevance to 5G PPP topics

INSPACE tech provides • Support of ultra‐high capacity

… by expanding to the space dimension• Increased flexibility in the allocation of demands

… by efficiently switching and both space and spectrum domains

Key topics relevant to 5G• TA10: High‐capacity Optical Core Networks for 5G Transport

• Relevant research within INSPACE: High capacity SDM based core infrastructureDirect and transparent mapping of demand in spectrum and/or space with use of advanced switching nodes

SDN compatible solutions to support virtualization and flexibility


Thank you!

Dr. Ioannis [email protected]

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