July 6, 2005 ICTON 2005, Barcelona, Spain 1

Extending the reach of 10 GE at 1310 nm

Josef VOJTĚCH, Miroslav KARÁSEK,

Jan RADIL

MotivationConfiguration of testsTest resultsConclusions

July 6, 2005 ICTON 2005, Barcelona, Spain 2

Extending the reach of 10 GE at 1310 nm

Motivation

Development of high-speed customer empowered fibre networks and availability of 10 GE LAN cards with 1310 nm transceivers stimulates theNeed for interconnection of stand-alone or hardware accelerated PCs at 10 Gbit/s rateAdvantage – zero chromatic dispersion of standard single mode fibres (SSMF) at 1310 nm in, the 1310 nm transceivers are much cheaper than the 1550 nm ones Disadvantage – loss of SSMF at 1310 nm is almost twice as high as at 1550 nm

July 6, 2005 ICTON 2005, Barcelona, Spain 3

Extending the reach of 10 GE at 1310 nm

fibre amplifiers available at 1310 nm

Praseodymium-doped fluoride fibre amplifiers (limited number of manufacturers, low saturated output power in comparison with EDFA, FiberLabs, FL8610-OB, Psat=16dBm, NF=5.5dB)

Distributed amplification in the transmission fibre utilizing stimulated Raman scattering (Raman fibre amplifier (RFA), no pump LDs at 1250 nm, Raman fibre laser, IPG, Pout

max =2 W at 1250nm)Semiconductor optical amplifiers (InPhenix, IPSAD1301, Psat=10dBm, NF=7.5dB)

July 6, 2005 ICTON 2005, Barcelona, Spain 4

Extending the reach of 10 GE at 1310 nm

PDFFA characteristics

July 6, 2005 ICTON 2005, Barcelona, Spain 5

Extending the reach of 10 GE at 1310 nm

Modularity of SSMF spools available was 5, 10, 25, and 50 km Reliability of 10 GE transmission was verified using PING utility107 of 1500 bytes long packets were transmitted and the number of successfully received packets was monitoredThe transmission was regarded to be successful when more than 99.95% of launched packets was received

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Extending the reach of 10 GE at 1310 nm

Test setup I

PDFA/SOA

TX RX

TX PDFA/SOA

RX

PDFATX PDFA RX

PDFATX PDFA RX

Booster amplifier (BA)

Preamplifier (PA)

BA + in-line amplifier (IA)

BA + PA

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Extending the reach of 10 GE at 1310 nm

Test setup II

PDFATX

RFARX

PDFAPDFATX

RFARX

PDFA

PDFATX

PDFARX

RFA

BA + PA + RFA

Two-stage BA + RFA

BA + IA + RFA

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Extending the reach of 10 GE at 1310 nm

10 GE transceiver XENPACK 10GBASE-LR

Transceiver reach – nominal 10 km SSMF - laboratory verified 32 km SSMF

TX PTx out= -1,9 dBm λ = 1304,3 nmRX back-to-back sensitivity -17 dBm

TX output spectrum and eye diagram

July 6, 2005 ICTON 2005, Barcelona, Spain 9

Extending the reach of 10 GE at 1310 nm

PDFFA booster configuration

Maximum span length 85 km of SSMF, loss α = 31,5 dBPBo out= 14,4 dBm

PRx in = -18,1 , OSNR = 42 dB

Launched into the SSMF RX input power

July 6, 2005 ICTON 2005, Barcelona, Spain 10

Extending the reach of 10 GE at 1310 nm

PDFFA as preamplifier

Maximum span length 70 km, α=25.2 dB, OSNR=24 dBPPA in= -27.1 dBm, PPA out= -2.4 dBm

Span length with OBPF 75 km, α=27 dB, OSNR=23 dBPPA in= -28,9 dBm, FWHM of the OBPF 0.8 nm

After PDFFA without OBPF After PDFFA with an OBPF

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Extending the reach of 10 GE at 1310 nm

PDFFA booster plus PDFFA preamplifier

Maximum span length 100 km, α=37.2 dB, OSNR=28 dBPPA in= -22.8 dBm PPA out= -3.7 dBm

with OBPF, span length 120 km, α= 43.6 dB, OSNR=23 dBPPA in= -29.2 dBm PPa out= -6 dBm

At the RX without OBPF At the RX with an OBPF

July 6, 2005 ICTON 2005, Barcelona, Spain 12

Extending the reach of 10 GE at 1310 nm

PDFFA booster plus PDFFA preamplifier

Eye diagram after PA (100 km)

Eye diagram after PA and OBPF (120 km)

Eye diagram after PA (120 km)

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Extending the reach of 10 GE at 1310 nm

PDFFA booster and PDFF in-line

Span length 100+60 km, loss 37,2+19,2 dBPIn in= -22,8 dBm, PIn out= 0,7 dBm, PRx= -17,6 dBm

OSNR 29,4 dB

Za in-line zelilovačem Před přijímačem

July 6, 2005 ICTON 2005, Barcelona, Spain 14

Extending the reach of 10 GE at 1310 nm

10 GE two-stage booster a RFA

Span length 135 km SSMF, loss = 54,1 dBPBo out= 14,5 dBm, PRFA= 1,3 W

PRx in = -13,6, OSNR = 28,4 dB

Za boostery Za filtrem Za RFA, bez filtru

Před přijímačem

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Extending the reach of 10 GE at 1310 nm

10 GE booster, in-line and RFASpan length 100+100 km SSMF,loss 37,2+38 dBPBo out= 12,1 dBm, PRFA= 1,35 W

PRx= -16 dBm, OSNR 24 dB

1.1 1.2 1.3 1.4 1.5

75

80

85

90

95

100

nu

mb

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of

rece

ive

d p

acke

ts,

%

Raman pump power, W

360 B packets 1500 B packets

Za RFA, bez filtru

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Extending the reach of 10 GE at 1310 nm

Comparison

Application # 10GE reach [km]

No amplification 30

1 Bo 85 (60 SOA)

2 Pa 70/75(+OF) (-/65 SOA)

3 Bo + Pa 100/120(+OF)

3 Bo + In 160

4 2*Bo + RFA 135

5 Bo + In + RFA 200

July 6, 2005 ICTON 2005, Barcelona, Spain 17

Extending the reach of 10 GE at 1310 nm Thank you for your attention!