Walkoff free ultrafast nonlinear optical loop mirror

1
NAA2001 OTuA6 3rd, July, 2001
Walk-off free ultrafast nonlinear optical loop
mirror composed of a highly-nonlinear
dispersion-shifted fiber for demultiplexing 320
Gbit/s TDM signals
Hideyuki Sotobayashi, Chikara Sawaguchi,
Yahei Koyamada, and Wataru Chujo Communicati
ons Research Laboratory, Independent
Administrative Institution Department of Media
and Telecomunications Engineering, Ibaraki
University
2
Outline of this talk
1.Background of this research Ultrafast
optical switch Previous
work 2.Walk-off free ultrafast HNL-DSF
NOLM 3.Experimental results and discussion
320 Gbit/s-to-10 Gbit/s OTDM signal
demultiplexing 4.Conclusion
3
Background of this research

• Applications of all-optical switches
• demultiplexing
• wavelength conversion
• regenerating, and so on.
• All-optical high-speed demultiplexing
• four-wave mixing (FWM)
• nonlinear optical loop mirror (NOLM)

4
This research

• Simple configuration of ultrafast NOLM is
  proposed.
• It is composed of a short length highly-nonlinear
  dispersion-shifted fiber (HNL-DSF) for stable and
  walk-off free ultrafast demultiplexing.
• Error-free all-optical demultiplexing of 320
  Gbit/s TDM signals to 10 Gbit/s is demonstrated
  by using a 100m long HNL-DSF NOLM.

5
Walk-off free ultrafast HNL-DSF NOLM
6
Group delay characteristics of a 100 m long
HNL-DSF used for an ultrafast NOLM
zero dispersion wavelength 1554.5 nm
dispersion slope 0.028 ps/nm2/km nonlinear
coefficient 15 W-1km-1 length 100 m
attenuation coefficient 0.7 dB/km
7
Experimental setup
8
Switching window of NOLM
Fig. 3. Measured autocorrelation waveforms of
control MLLD pulse (upper trace) and optical
gated switching window (lower trace).
9
Experimental results
Fig. 4. (a) Streak camera traces of 320 Gbit/s
TDM signal (upper trace) and demultiplexed 10
Gbit/s signal. (b) Measured eye diagram of
demultiplexed 10 Gbit/s signal.
10
Experimental results
11
Conclusion

• We have constructed a stable and walk-off free,
  ultrafast NOLM by use of a HNL-DSF.
• We have successfully demonstrated a 320 Gbit/s
  TDM signals to 10 Gbit/s demultiplexing by using
  a 100 m long HNL-DSF NOLM.
• The upper bit rate has been limited by the pulse
  width of the control pulse in this experiment. By
  considering the group delay characteristics and
  spectrum widths and wavelength allocations of the
  signal and control pulses, beyond terabits/s
  operations would be feasible.