Four-wave mixing based 10-Gb/s tunable wavelength conversion in ...
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386 CHINESE OPTICS LETTERS / Vol. 5, No. 7 / July 10, 2007
Four-wave mixing based 10-Gb/s tunable wavelength
conversion in dispersion-flattened microstructure fibers
Xia Zhang (
), Xiaomin Ren (
), Zinan Wang (
),
Yongzh ao Xu (
), Yongqing Huang (
), and Xue Chen (
ííí
)
Key Laboratory of Optical Communication and Lightwave Technologies, Ministry of Education,
Beijing University of Posts and Telecomm unications, Beijing 100876
Received March 14, 2007
All-optical wavelength conversion of 10-Gb/s signal based on four-wave mixing is experimentally demon-
strated in a 30-m-long dispersion-flattened microstructure fiber with small positive dispersion. For an
a verage pump power of 26 dBm, the conversion efficiency was around −19.5 dB with the fluctuation less
than ±1.4 dB, covering a conversion bandwidth of 20 nm. The eye diagram of the converted signal shows
good eye opening.
OCIS codes: 060.2330, 060.2310.
All-optical wavelength conversion is considered to be a
crucial technique in future high-speed dense wavelength-
division-multiplexed (DWDM) network
[1]
.Amongvar-
ious wavelength conversion techniques, the use of the
four-wave mixing (FWM) in nonlinear optical fibers
would be one of the easiest and the most flexible ap-
proaches because of its simple configuration and trans-
parency to both bit rate and modulation format
[2]
.The
relatively low nonlinearity presented by the dispersion-
shifted fiber (DSF) requires the use of long length
[3]
.
As a consequence it is difficult to control and stabilize
the conversion device. Also, the necessity of placing the
pump at or near the zero-dispersion wavelength of the
fiber to ensure phase matching may limit the flexibility
of the optical networks.
Microstructure fibers (MFs) are currently a topic of
high interest because of their unusual optical properties
which cannot be realized in conventional optical fibers
[4]
.
MFs have central region of pure silica surrounded by a
lattice of air-holes in the cladding running along the fiber
length, and they offer design flexibility in controlling the
mode propagation properties by changing the size and
pattern of the air holes
[5−7]
. The design freedom offered
by the MF technology makes highly nonlinear MF very
suitable for wavelength conversion where the fiber pa-
rameters should be tailored to satisfy specific demands,
namely a flat dispersion profile and a high nonlinear-
ity. The low dispersion values of MF make it satisfy
the quasi-phase matching condition over a wide wave-
length range. FWM-based wavelength conversion has
been demonstrated utilizing MF
[8−10]
, showing promis-
ing applications in DWDM networks.
In this letter, we report the wavelength conversion of
10-Gb/s signal using FWM in a dispersion-flattened MF
with low positive dispersion values. We show a conver-
sion efficiency of −19.5 dB for an average pump power
of 26 dBm and a conversion bandwidth of 20 nm. The
quality of the converted signal is monitored by eye dia-
grams.
The schematic of our experimental setup is shown in
Fig. 1. The signal beam at a fixed wavelength of 1550.05
nm was modulated with a 2
15
− 1 pseudorandom data
sequence at a data rate of 10 Gb/s and then combined
with the pump beam using a 3-dB coupler. The two
beams were then amplified using a high power erbium-
doped fiber amplifier (EDFA) with an average saturated
power of 26 dBm.
The fiber used in this experiment is a 30-m-long com-
mercial available dispersion-flattened high nonlinear MF
from Crytal-Fibre A/S (NL-1550-POS-1). The MF has a
nonlinear parameter of 11 W
−1
·km
−1
at 1550 nm and a
small positive dispersion of 0.5−1.5ps/(km·nm) over the
range of 1480 − 1620 nm, as shown in Fig. 2. Also, the
MF is spliced to standard single-mode fiber pigtails, lead-
ing to a total loss of 2 dB from connector to connector.
The states of polarization of both the signal and the
Fig. 1. Schematic of the experimental setup. DFB: dis-
tributed feedback laser; PC: polarization controller; PWR:
optical power meter; FFP: fiber Fabry-Perot filter.
Fig. 2. Dispersion curve of the MF used in experiment.
1671-7694/2007/070386-03
c
2007 Chinese Optics Letters
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