Open-source NSE Codes Applied to 40 Gbit/s Soliton Lines

KAZUHIRO SHIMOURA 　

Kansai Electric Power Co., JapanECOC2001

( Oct. 4, 2001 RAI Congress Centre, Amsterdam,The Netherlands )

CONTENTSCONTENTS

Q-map method and Open-source CodeSimulation Reference System

40 Gbit/s Soliton line design by Q-mapsOptimal strength of dispersion management

Average-dispersion and signal-power design

Merit of the 40 Gbit/s soliton system

Nonlinear Schrödinger EquationNonlinear Schrödinger Equation

( by Akira Hasegawa 1973 )( by Akira Hasegawa 1973 )

][ BAz

])1(2

[exp),0(2

0

2

CiTS

Pm

26

1

2 3

3

32

2

2

iA

][2

22

RTi

B

Chirped Gaussian Pulse

Non Linear

Linear

Split Step Fourier MethodSplit Step Fourier Method ( by Fred Tappert 1971 )( by Fred Tappert 1971 )

Calculated by Mathematica Ver.4 on Win2000

Personal NSE Simulation SystemPersonal NSE Simulation System

Simulation Reference SystemSimulation Reference System

Q-factor definition for RZ-pulseQ-factor definition for RZ-pulse

Dispersion map of the simulation modelDispersion map of the simulation model (Periodical dispersion compensation scheme)

Pulse widths vibration in the DM-linesPulse widths vibration in the DM-lines ( 40Gbit/s, Dc=±20ps/nm, Lc=100km, with 6nm filters )

Global Structure Local Structure

Q-maps for the 40 Gbit/s DM-Soliton Lines

(Nc = 2, Pav=+5dBm, La = 50 km, Lt = 3 Mm)

Optimal Dispersion Compensation: Dc = ±30 ps/nm

Dav – Dc plane Dav – Pav plane

Nc = 4 Nc = 6

Q-maps for the 40 Gbit/s DM-Soliton Lines

(Nc = 4/6, Pav=+5dBm, La = 50 km, Lt = 3 Mm)

Optimal Dispersion Compensation: Dc = ±30 ps/nm

La=30km La=80km

Q-maps for the 40 Gbit/s DM-Soliton Lines

(Nc = 2, Pav=+5dBm, La = 30/80 km, Lt = 3 Mm)

La=30km La=80km

Q-maps for the 40 Gbit/s DM-Soliton Lines

(Nc = 2, Pav=+5dBm, La = 30/80 km, Lt = 3 Mm)

PMD = 0.1 ps/km0.5

PMD suppression effect of soliton

(Nc = 2, Pav=+5dBm, Dc=+30ps/nm, La = 50km, Lt = 3Mm)

PMD = 0 ps/km0.5

Optimal S-parameter for the DM-lineOptimal S-parameter for the DM-line( T. Yu, et. al., 1997 )( T. Yu, et. al., 1997 )

22

2211 55.2SS T

Dc

t

zkzkS

k = − ( λ2 / 2πc ) d = 1.27 D (ps/nm/km)

Ts (ps) : FWHM at chirp-free point

Dc = ±30 ps/nm, Ts = 6.8 ps S = 1.65

S = 1.65 ( T. Yu, et. al., 1997 )

Results of the 40Gbit/s simulationResults of the 40Gbit/s simulation

Dispersion management strengthDc = ±30 ±10 (ps/nm)

: for all cases S = 1.65

Signal Power and Dispersion Dav = +0.04 ± 0.02 (ps/nm/km)

Pav = +7 ± 2 (dBm) : for La = 50km case

Experimental setup of the 80 Gbit/s, Experimental setup of the 80 Gbit/s, 800 km transmission800 km transmission

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Bit Error Rate for 8*10Gbit/s CHBit Error Rate for 8*10Gbit/s CH

–19 –18 –17 –16 –15

Received Power (dBm)

Bit E

rror

Rate

10–11

10–10

10–9

10–8

10–7

10–6

10–5

● : CH1■: CH2▲ : CH3▼ : CH4○ : CH5□: CH6△ : CH7▽ : CH8

Merit of the soliton-based systemMerit of the soliton-based system

For Long distance transmission

(Soliton stability effect, High intensity signal and suppressing PMD effect)

Conventional DSF without any dispersion slope compensation (Single Wavelength)

Narrow band low cost amplifier with Band pass filter is available.

Dispersion design is simple (Dc= ±30ps/nm)

Low cost High capacity system is possible.

You can download some codeYou can download some code

http://www.asahi-net.or.jp/~ix6k-smur/soliton.htmlhttp://www.asahi-net.or.jp/~ix6k-smur/soliton.html