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WP5: OTDM-to-WDM conversion update ORC CONTRIBUTION – F. Parmigiani TRIUMPH meeting 14-12-2006.

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Presentation on theme: "WP5: OTDM-to-WDM conversion update ORC CONTRIBUTION – F. Parmigiani TRIUMPH meeting 14-12-2006."— Presentation transcript:

1 WP5: OTDM-to-WDM conversion update ORC CONTRIBUTION – F. Parmigiani TRIUMPH meeting

2 TRIUMPH OTDM-to-WDM conversion update 14-December-2006 CONFIDENTIAL 2 WP5: OTDM-to-WDM conversion Conversion provided by a rectangular shaped, linearly-chirped pulse Implementation of this conversion is more challenging at higher bit rates Condition of one-to-one mapping implies a precise relationship between: chirp of the broadband signal strength of the nonlinear XPM interaction Optical Switch OTDM data Signal WDM data Signal Broadband Signal WDM channel separation crosstalk between the WDM channels

3 TRIUMPH OTDM-to-WDM conversion update 14-December-2006 CONFIDENTIAL 3 WP5: OTDM-to-WDM conversion Alternative technique: 4 independent and synchronized WDM channels Pulse carving at 40 GHz using EAMs. WDM data Signal Broadband Signal OTDM data Signal DFB1 DFB2 DFB3 DFB4 EAM1 EAM2 EAM3 EAM

4 TRIUMPH OTDM-to-WDM conversion update 14-December-2006 CONFIDENTIAL 4 Extinction ratio degradation in NOLMs See for example: Sakamoto et al., PTL, vol.16, n.2, 2004 Time Phase Shift XPM Co-propagating Signal Time Phase Shift XPM Counter-propagating Signal Time Intensity Control Pulse Time Intensity XPM Output Signal Co-propagating signal Counter- propagating signal Counter-propagating signal suffers from XPM induced by the time-average power of the control pulses at high bit rates (160Gb/s) the extinction ratio of the switch is compromised at high bit rate (160Gb/s)

5 TRIUMPH OTDM-to-WDM conversion update 14-December-2006 CONFIDENTIAL 5 Initial Switching settings T FWHM =2ps (Gaussian) =1542.5nm Pave=16dBm TFWHM=4.2ps (Gaussian)  =1554nm Spacing=4.8nm (600GHz) Pave=0dBm ? ? HNLF: lenght=0.5km loss=1.44 dB/km Slope=0.01ps/nm 2 /km

6 TRIUMPH OTDM-to-WDM conversion update 14-December-2006 CONFIDENTIAL 6 Characteristics of switched pulses

7 TRIUMPH OTDM-to-WDM conversion update 14-December-2006 CONFIDENTIAL 7 Switched pulses in time and wavelength ~5dB P control =16dBm P control =16dBm ~ 30dB >30dB 10dB 13% 33%

8 TRIUMPH OTDM-to-WDM conversion update 14-December-2006 CONFIDENTIAL 8 Switched pulse - different settings P control =16dBm 10dB >30dB 13% 24% P control =16dBm ~5dB ~25dB P control =19.5dBm

9 TRIUMPH OTDM-to-WDM conversion update 14-December-2006 CONFIDENTIAL 9 Conclusion We have studied the NOLM switch characteristics varying the dispersion of the HNLF. Trade off between minimum pulse distortion/maximum switching efficiency (lower dispersion to minimize the walk-off) and maximum WDM crosstalk (higher dispersion). Are peak pulse fluctuations and pulse distortions major issues for the OTDM to WDM conversion? Equipment involved: NOLM, EAMs, HNLFs,… Possible alternative: Kerr switch


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