Miroslav KarásekPavel Peterka

Jan Radil

1O GE long-haul transmissions without in-line EDFAs

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1O GE long-haul transmissions without in-line EDFAs

Outline

Motivation

Experimental results

Conclusions

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Utilization of dark fibres – CEF networks

Cost effective deployment of multigigabit lines (N x 1 GE, N x 10 GE) using inexpensive commercial equipment (NRZ, without FEC)

National Research and Educational Networks (NRENs) rely on leased dark fibres and prefer to have no active components between the transmitter and the receiver

Due to the commercial availability of high-power erbium-doped fibre amplifiers, the span of repeaterless links has substantially increased

Repeaterless or Nothing-in-line (NIL) approach

1O GE long-haul transmissions without in-line EDFAs

Motivation

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1O GE long-haul transmissions without in-line EDFAs Motivation

Fibre distances

For CzechLight - experimental and breakable network

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Results of error-free transmission of 2 x 10 GE plus 2 x 1 GE channels over 200 km and 2 x 10 GE over 250 km of G.652 fibre without deployment of in-line amplifiers

1 x 10 GE and 2 x 10 GE over 287 km of mixed G.652/G.655 link

Commercially available equipment (Cisco Catalyst 6503 with 10 GE blades, high power and low noise Keopsys EDFAs and Raman fibre lasers) have been used in our experimental set-up

All the active components and the DCF were placed either at the transmitter, or at the receiver side of the link

BER better then 10-12 (using either the PING utility, or by BERT Acterna ONT-50)

1O GE long-haul transmissions without in-line EDFAs

Experimental results

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1O GE long-haul transmissions without in-line EDFAs Experimental results – 4 WDM channels over 200

km

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1O GE long-haul transmissions without in-line EDFAs

Experimental results – 4 WDM channels over 200 km

optical power at the input port of EDFA1

(resolution bandwidth of the optical spectrum analyzer 0.033 nm)

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1O GE long-haul transmissions without in-line EDFAs

Experimental results – 4 WDM channels over 200 km

Optical power at the input to EDFA2: PSSMF=20 dBm

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1O GE long-haul transmissions without in-line EDFAs

Experimental results – 4 WDM channels over 200 km

Optical powers at

the output of DCF

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1O GE long-haul transmissions without in-line EDFAs

Experimental results – 4 WDM channels over 200 kmdependence of BER on EDFA1 output power for the 10 GE channel at 1545.97 nmmeasured by the ACTERNA ONT-50

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1O GE long-haul transmissions without in-line EDFAs

Experimental results – 2 WDM channels over 250 km

λ1=1544.98nm, λ2=1545.97nm

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1O GE long-haul transmissions without in-line EDFAs

Experimental results – 2 WDM channels over 250 km

Optical power at the output of the DCF2 in case of post-compensation scheme: PSSMF=15.5 dBm, PRL=1.1 W

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1O GE long-haul transmissions without in-line EDFAs Experimental results – 2 channels / 287 km

G.652/G.655

287 km set-up not tested properly with BERT

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1O GE long-haul transmissions without in-line EDFAs Experimental results – 2 channels / 287 km

The eye diagram – before the receiver

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1O GE long-haul transmissions without in-line EDFAs Experimental results – 2 channels / 287 km

Number of successfully received packets as a function of PEDFA1

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1O GE long-haul transmissions without in-line EDFAs Experimental results – 2 channels / 287 km

Number of successfully received packets as a function of PRL

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Using commercially available and relatively cheap optical communication systems and components, NIL error-free transmission of N x 1 GE and N x 10 GE channels is possible

The error-free transmission is not very sensitive to optical powers launched into the SSMF and DCF, neither to Raman pump power

These results are encouraging especially for operators of national research and educational networks who rely on leased dark fibres and prefer as long NIL transmission as possible

We expect better results using DWDM transmitters (GBIC, SFP, XENPAK, XFP)

1O GE long-haul transmissions without in-line EDFAs

Conclusions

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1O GE long-haul transmissions without in-line EDFAs References

[1] Karásek, M. - Peterka, P. - Radil, J. , „202 km repeaterless transmission of 2 x 10 GE plus 2 x 1 GE channels over standard single mode fibre. “, In: Optics Communications 235, pp. 269-274., 2004.

[2] Karásek, M. - Peterka, P. - Radil, J. , „Repeaterless Transmission of 2 x 10 GE Channels over 252 km of Standard Single Mode Fibre without in-line EDFA. “, In: IEE Proc. Optoelectronics, sent for publication, 2004.

[3] Radil, J. - Karásek, M., „Experiments with 10 GE long-haul transmissions in academic and research networks.“, In: I2 member meeting, Arlington, VA, 2004.

[4] Radil, J., „ Experiments on optical layer and breakable research networks. “, In: 14th TF-NGN meeting, Amsterdam, 2004.

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1O GE long-haul transmissions without in-line EDFAs Thank you for your attention!