Josef Vojtěch, Stanislav Šíma, Lada Altmannová, Miloslav Hůla, Jan Radil, Pavel Škoda Sharing of Fibers by Transmission Systems Open Photonic

Josef Vojtěch,Stanislav Šíma, Lada Altmannová, Miloslav Hůla,

Jan Radil, Pavel Škoda

www.cesnet.cz

Sharing of Fibers by Transmission SystemsOpen Photonic Transmission Systems

czechlight.cesnet.cz

vojtech (zavináč) cesnet (tečka) cz

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Authors participate on following projects:

Large infrastructure CESNET (www.cesnet.cz),

GÉANT, GN3 (www.geant.net)

Presented content don’t necessarily represent an official opinion of mentioned institutions and projects


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Outline

Fibers Sharing Motivations Possible Approaches

Spatial Multiplex Wavelength Multiplex

Open Transmission Systems

Photonic Transmission (incl. Real-time)

Conclusions

Q&A


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Fibers Sharing - Motivations

Fibers sharing – more transmission systems in operation over single fiber par

Why!?:

Demand for additional lambdas (incl. non-data with own supervisory channel)

Simply no free fibers leftNew ground cable installation is expensive

(e.g. 60 EUR/m in rural areas [1])[1] S. Sima et al.: Deliverable D3.2v3 of Porta Optica project: Economic analysis, dark fibre usage cost model and model of operations http://www.porta-optica.org/publications/POS-D3.2_Economical_analysis.pdf


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Fibers Sharing – Motivations Cont.

Economical solution - although in case of fibers rentalAnnualized average cost of fiber rental:

cf = 0.5 EUR/m/year [1]

Annualized costs of transmission system (10Gbps) [1]:

ct = 0.12 EUR/m/year for proprietary system

ct = from 0.035 to 0.047 EUR/m/year for open systems

Obviously 2.ct + cf < 2.ct + 2.cf


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Fibers Sharing – Possible Approaches

Spatial MultiplexInter fiber

Two single fiber bidirectional systems

Intra fiber Few mode fiber Multicore fiber

Wavelength Multiplex Band based Sub-band based Interleaved Free allocation of spectrum


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Fibers Sharing – Spatial Multiplex

Inter Fiber Two single fiber systems, each over one fiber Excellent systems isolation Limited to 2 systems


Tx

Rx

Rx

Tx

Tx

Rx

Rx

Tx

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Fibers Sharing – Single Fiber Transmission

Sharing of single fiber between directions typically on wavelength base

Proven technology, commercially available and in operation

In CESNET2 over 905km of single fiber with DWDM system

Transmission system price increase Less than 0.0015 EUR/m/year [1]


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http://www.ces.net/netreport/CESNET2_IP_MPLS_backbone_utilization/Plzen%20-%3E%20Cheb/index.html

Sharing of Fibers by Transmission Systems

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Fibers Sharing – Spatial Multiplex

Intra Fiber Few mode fiber (3, 5,...) Multicore fiber

Still under development – known issues:

xtalk, coupling/decoupling, splicing, connectors, amplification (EDFA/Raman)


source: C. Koebele et al.: 40km Transmission of Five Mode Division Multiplexed Data Streams at 100Gb/s with low MIMO-DSP Complexity, ECOC 2011 PDP Th.12.C3

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Fibers Sharing – Wavelength Multiplex

Wavelength Multiplex Band based Sub-band based Interleaved Free allocation


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Wavelength Multiplex

Based on whole transmission bands Single vendor - C and L proven, S still limited Arrangement of management channels Interaction through Raman scattering


Wavelength

Optical power

S band C band L band

Source: Cisco

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Wavelength Multiplex

Sub-band based

Interleaved

Free allocation

Arrangement of management channels – complicated Interaction XPM and FWM, vs. guard-bands


C band Optical power

Wavelength


Wavelength


Wavelength

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Open Photonic Transmission Systems

Free (SW) – freedom to use, study or modify; not necessarily for free

Open (SW) – openness for community development, freedom of redistribution

Differences small, but not exactly same classes Commercial SW – proprietary or free (e.g. Red Hat)

Free/Open source hardware Designed and offered in the same way as SW


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Open Photonic Transmission Systems

Obvious success of open/free SW

Open/free approach in networking exists Plenty of smaller project, e.g. open routers Big players - Network OS JUNOS (based on Free BSD)

opened in 2007

Open transmission system developed in CESNET

Open transmission system Owner/operator can system actively modify and improve

- fast development of new features/services

Freedoms preserved Freedom to use on own, study or modify


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Photonic Transmission Services

To allow also non-data transmissions

To support true real time applications

Low and fixed latency – propagation only

Preferably no OEO


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High performance and high speed data transmission need not to be real-time. Real-time has to do with timeliness constraints

Present network usually support non-real-time services, i.e. no timeliness constraints are defined

Examples (best-effort not acceptable): Real time system control in industry and transport,

vehicle control Radio frequency over fibre (signals from radio locator,

sonar, etc.) Remote instrument control, telescope control HD Videoconferencing and multicast with quality

guaranty Real time earthquake monitoring and emergency

networks


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Examples: Multi-channel low-latency video transmissions

for 4K/2K and 3D HD applications in medicine, engineering (CAVE-to-CAVE) and audiovisual processing

Surgery broadcast:http://www.ces.net/doc/press/2010/pr100304.html

Remote robotic surgery (da Vinci robot) - distance 130 km, delay less 1 ms, truly real-time 3D Full HD stereo broadcast http://www.ces.net/doc/press/2010/pr100618.html


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Precise time transfer - comparison of atomic clock scales Prague (UFE) and Vienna (BEV) Distance 520 km, accuracy under 1 ns(1 ns ≈ 30 cm in vacuum or 20 cm in fibre)

http://www.pttimeeting.org/archivemeetings/2010papers/paper33.pdf

http://www.ces.net/doc/press/2010/pr100401.html


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Precise Time Transfer Demo


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Conclusions

Fibre sharing – works with some proprietary systems from one vendor (C+L)

Need to verify it for different vendors

Open system are suitable candidate (OO, OP)

Photonic services operational

Development and accuracy improvement


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Acknowledgement

Jan Gruntorád, Miroslav Karásek, Martin Míchal, Jan Nejman, Václav Novák, Karel Slavíček, Vladimír Smotlacha


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Thank You for kind attention!

Questions?

vojtech (zavináč) cesnet (tečka) cz


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References 1

[2] Petr Holub, Josef Vojtech, Jan Radil, et. al., „Pure Optical (Photonic) Multicast“, GLIF 2007 Demo, Prague, 2007.[3] Jan Radil, Stanislav Šíma, „ Customized Approaches to Fibre-based E2E Services“, TERENENA 1st E2E Workshop, Amsterdam, 2008.[4] Stanislav Šíma, et. al., „ LTTx: Lightpaths to the application, From GOLEs to dispersed end users “, GLIF 2008 Workshop, Seattle WA, 2008.[5] Josef Vojtěch, Jan Radil, „Transparent all optical switching devices in CESNET“, 25th APAN meeting, Honolulu HI, 2008.[6] Radil J., Vojtěch J., Karásek M., Šíma S.: Dark Fibre Networks and How to Light Them, 4th Quilt Optical Networking Workshop, Fort Lauderdale FL, 2006.


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References 2

[7] czechligh.cesnet.cz, Publications

[8] Global Lambda Integrated Facility, http://www.glif.is

[9] Vojtěch J., „CzechLight and CzechLight amplifiers“. In: 17th TF-NGN meeting, Zurych, Switzerland, April 2005


Documents

Josef Vojtěch, Stanislav Šíma, Lada Altmannová, Miloslav Hůla, Jan Radil, Pavel Škoda Sharing of Fibers by Transmission Systems Open Photonic