Wideband and tunable wavelength conversion

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CLEO2001 CThB5 10th, May
Wideband and tunable wavelength conversion of 10
Gbit/s RZ data sequences based on optical
time-gating of supercontinuum source
Hideyuki Sotobayashi, Wataru Chujo Communications
Research Laboratory Takeshi Ozeki Sophia
University
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Outline of this talk
1. Background of this research 2. Principle
operation of wavelength conversion by optical
time-gating of supercontinuum 3. Experimental
results of wideband and tunable wavelength
conversion of 10 Gbit/s RZ data sequencesby
optical time-gating of supercontinuum 4.
Conclusion
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Background of this research
WDM Networks

• WDM source of ITU grid
• Wavelength tunable light source
• Wavelength conversion

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WDM source by spectrum slicing SC
Supercontinuum Generation
Wavelength Tunable Pulse Source
H. Sotobayashi and K. Kitayama, Electron. Lett.,
vol. 34, pp.1336-1337, 1998
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This research

• We propose a novel wideband tunable wavelength
  conversion technique of RZ signals by optical
  time-gating of supercontinuum (SC) light source.
• The SC pulse generated by nonlinear propagation
  in normal dispersion fiber is the rectangular
  shape having the highly linear up-chirping. By
  controlling the optical time-gating position, the
  center wavelength of time-gated SC pulse can be
  tuned.
• Error-free 10 Gbit/s wavelength conversion with
  the tuning range of 27.1 nm is experimentally
  demonstrated.

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Operational principle
SC generation
Input pulse tFWHM3ps Ppk2.45W N7 Fiber
D0.6ps/nm/km L2km ß30 LD5.70km
LLN116m
Normal dispersion regime
Anomalous dispersion regime
Flat spectrum
Many dip
Frequency Domain
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Operational principle
SC generation
Input pulse tFWHM3ps Ppk2.45W N7 Fiber
D0.6ps/nm/km L2km ß30 LD5.70km
LLN116m
Normal dispersion regime
Anomalous dispersion regime
Wide pulse Narrow
pulse Single pulse
Multiple pulse Linear chirp
Nonlinear chirp
Time Domain
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Operational principle
SC generation in normal dispersion fiber
the SC pulse generation by the accumulation of
frequency chirping caused by optical Kerr effects
in the normal dispersion fiber.

• rectangular shape in the time domain
• linear up-chirping in the frequency domain

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Operational principle
Operational principle of wavelength tuning by
spectrum-slicing SC.
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Operational principle
Operational principle of tunable wavelength
conversion by optical time-gating of SC

• Precise tuning by aligning the time position of
  time-gating
• Changeable wavelength tuning range

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Experimental setup
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Experimental results
20 ps/div
SC pulse
Time-stretched SC pulse
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Changeable wavelength tuning range
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Tunabe wavelength conversion by shifting time
position of optical time-gating
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BER performance of tunabe wavelength
conversion by time position shifting of optical
time-gating
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Conclusion

• We have proposed a novel wavelength conversion
  technique of RZ data sequences with wide tuning
  range which is realized by adjusting the
  time-position of the optical time-gating of
  highly chirped rectangular shape SC pulse.
• Error-free 10 Gbit/s wavelength conversion with
  the tuning range of 27.1 nm has been also
  experimentally demonstrated.
• The proposed method offers a powerful tool for
  developing ultrafast photonic networks.