-
[show abstract]
[hide abstract]
ABSTRACT: Summary form only given. A DPSSL at the wavelength range of
1-μm has achieved high power and highly efficient operation with a
good beam quality. This progress of DPSSL and improvement of a
wavelength converter are expanding available wavelength range of solid
state lasers. In particular, introduction of a periodic poled material
such as periodic-poled lithium niobate (PPLN) enhances wavelength
conversion efficiency dramatically because of its large effective
nonlinear coefficient and walkoff-free characteristics. Recently, we
have demonstrated high average output power operation of 1.5-μm
SRO-OPO based on 1 mm-thickness PPMgLN (MgO doped PPLN). Since MgO doped
lithium niobate is a strong material for photorefractive damage, total
average output power of as high as 60.3-W was obtained at room
temperature condition. In this earlier demonstration, the reflectivities
of OPO cavity mirrors were not optimized and the total conversion
efficiency was limited as 61-% by back-conversion process. Here, we used
a 2-μm OPO with optimized cavity mirrors and demonstrated high power
and highly efficient OPO operation at the same time
Lasers and Electro-Optics, 2001. CLEO '01. Technical Digest. Summaries of papers presented at the Conference on; 02/2001
-
[show abstract]
[hide abstract]
ABSTRACT: A 20 Gb/s-based soliton wavelength division multiplexed (WDM) transmission experiments using periodic dispersion compensation and dispersion slope compensation were demonstrated. Accumulated dispersion slope was compensated with two methods. The first method was periodical individual dispersion compensation. By using this technique, 60 Gb/s (20 Gb/s×3 WDM) transmission over 8000 km was demonstrated. The second method was the use of a dispersion-flattened transmission fiber. 160 Gb/s (20 Gb/s×8 WDM) transmission over 4000 km using periodically dispersion compensated dispersion-flattened fiber was also demonstrated
Journal of Lightwave Technology 02/1999; 17(1):80-85. · 2.78 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: 400 Gbit/s (20×20 Gbit/s) soliton-based return-to-zero
signals were successfully transmitted over 2000 km of dispersion
flattened fibre with a channel spacing of 0.8 nm by using a pre- and
periodical dispersion compensation scheme
Electronics Letters 12/1998; · 0.96 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: Recently, long-haul transmission experiments of more than
100-Gbit/s capacity were reported. Wavelength-division multiplexing
(WDM) is a key technology to achieve this kind of high-capacity
transmission. One technical problem of the long distance WDM
transmission is the dispersion slope of the transmission fiber. It
causes the difference of the chromatic dispersion accumulation upon the
WDM channels, and it will lead to transmission performance degradation.
In order to solve the problem, equalization of the dispersion slope
should be quite effective. This paper describes the results of the
long-distance transmission experiments using the dispersion slope
equalization. Both IM-DD WDM and optical soliton WDM are discussed
IEEE Journal of Quantum Electronics 12/1998; · 1.88 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: 400 Gbit/s (20×20 Gbit/s) soliton-based RZ signals were
successfully transmitted over 2000 km with a channel spacing of 0.8 nm
by using pre- and periodical dispersion compensation scheme. We
investigated the possibility to reduce the channel spacing to less than
1 nm in 20 Gbit/s-based soliton WDM systems and demonstrated 400 Gbit/s
(20×20 Gbit/s) transmission over 2000 km with a channel spacing of
0.8 nm using dispersion flattened fiber with pre- and periodic
dispersion compensation
Optical Communication, 1998. 24th European Conference on; 10/1998
-
[show abstract]
[hide abstract]
ABSTRACT: 160 Gbit/s (8×20 Gbit/s) soliton WDM signals were
successfully transmitted over 4000 km with a BER of <10<sup>-9</sup>,
by using periodically dispersion-compensated dispersion-flattened fibre
with an average dispersion slope of 0.0005 ps/km/nm<sup>2</sup>
Electronics Letters 04/1998; · 0.96 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: A 213 Gbit/s, 9064 km transmission experiment was successfully
demonstrated using periodic dispersion slope compensation. The
dispersion slope compensator was realised using a pair of arrayed
waveguide gratings and dispersion compensation fibres. This is the
largest capacity WDM transmission experiment over 9000 km reported to
date
Electronics Letters 04/1998; · 0.96 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: In summary, we successfully demonstrated 60 5.3 Gbit/s WDM signal
transmission over straight 1650-km transmission line by realizing broad
bandwidth as wide as 17.7 nm and employing dense channel spacing of 0.3
nm. The achieved average Q-factor was sufficiently enough for commercial
system application
Optical Fiber Communication Conference and Exhibit, 1998. OFC '98., Technical Digest; 03/1998
-
[show abstract]
[hide abstract]
ABSTRACT: This paper shows the results of forty WDM 2.5 Gbit/s transmission
over 12000 km for the first time, to our knowledge, by solving two
constraints. First, to realize a widely gain-flattened transmission line
over 10000 km, we used 980-nm pumped erbium-doped fiber amplifiers
(EDFAs) with a simple single peak gain shape, which allows us to have
precise gain flattening. Secondly we suppressed fiber nonlinearity
Optical Fiber Communication Conference and Exhibit, 1998. OFC '98., Technical Digest; 03/1998
-
[show abstract]
[hide abstract]
ABSTRACT: 50 wavelength division multiplexed signals were transmitted at
10.66 Gbit/s over a 1655 km EDFA chain. A gain-flattened EDFA, pumped at
1480 nm, and a dense channel separation of 0.3 nm were adopted. This is
the first demonstration of 0.5 Tbit/s transmission over 1000 km
Electronics Letters 03/1998; · 0.96 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: 40 WDM 2.5 Gbit/s transmission is successfully demonstrated over
12000 km for the first time, using widely gain-flattened low-noise 980
nm-pumped EDFAs and a large effective area fibre. The gain shape of the
transmission line was almost maintained over 18000 km
Electronics Letters 03/1998; · 0.96 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: The authors have demonstrated 10 Gbit/s based long-distance WDM
transmission using a dispersion slope compensator and a non-soliton RZ
pulse. A novel channel-by-channel in-line dispersion compensator was
realised by using a pair of arrayed waveguide gratings and dispersion
compensation fibres. As a result, 10 WDM signals were transmitted over
6000 km
Electronics Letters 12/1997; · 0.96 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: 533 Gbit/s (50×10.66 Gbit/s) over 1655 km straight-line
transmission was demonstrated, for the first time, by employing 14.7 nm
wide gain-flattened Er-doped fibre amplifier (EDFA) chain pumped at 1480
nm
Integrated Optics and Optical Fibre Communications, 11th International Conference on, and 23rd European Conference on Optical Communications (Conf. Publ. No.: 448); 10/1997
-
[show abstract]
[hide abstract]
ABSTRACT: A multiwavelength fiber ring-laser employing a pair of silica-based arrayed-waveguide-gratings (AWGs) is proposed to easily implement a stable multiwavelength operation for a variety of research needs. A fixed multiwavelength operation is available when the free-spectral-range (FSR) of the AWGs is wide enough to cover the gain bandwidth of deployed erbium-doped fiber amplifiers (EDFAs). A tunable multiwavelength operation is also available when the FSR is narrower than the gain bandwidth. 15 channels with 1.6-nm spacing in the fix type, and five channels with about 40-nm discretely tunable range at 1.4-nm spacing in the tunable type and almost 50-dB signal to amplified spontaneous emission (ASE) ratio in both types are demonstrated.
IEEE Photonics Technology Letters 08/1997; · 2.19 Impact Factor
-
Optics and Photonics News 07/1997; 8:56.
-
[show abstract]
[hide abstract]
ABSTRACT: Transmission performance has been greatly improved by employing
bit-synchronous phase modulation to source pulses in 20 Gbit/s
soliton-based RZ transmission experiments. The tolerable window for both
repeater output power and signal wavelength, for 9000 km transmission,
was doubled with phase modulation
Electronics Letters 07/1997; · 0.96 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: The authors have successfully demonstrated long-distance
transmission experiments using densely-spaced WDM technology. 22 signal
wavelengths, each containing 5 Gbit/s of binary data, were transmitted
through a recirculating loop fibre transmission line; less than a
10<sup>-9</sup> bit error rate equivalent was achieved after 9500 km of
transmission on all channels
Electronics Letters 05/1997; · 0.96 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: Soliton WDM transmission of two and three-channel 20 Gbit/s
signals over transoceanic distances has been demonstrated, for the first
time, using periodic compensation of dispersion and its slope of the
transmission fibre without any active soliton control, sliding frequency
guiding filters, or dispersion tapering fibre
Electronics Letters 05/1997; · 0.96 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: The authors have demonstrated the effectiveness of periodic
dispersion compensation and polarisation-division-multiplexing for
timing jitter reduction in 40 Gbit/s single-channel soliton
transmission, and have succeeded in 5000 km straight-line transmission
experiments at 40 Gbit/s for the first time
Electronics Letters 05/1997; · 0.96 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: We have proposed a novel wavelength converter using an
electroabsorption modulator. High-quality conversion has been
demonstrated at 20 Gbit/s over 30 nm of wavelength range. The
potentialities for high speed (>40 Gbit/s) and broadcasting
applications were also demonstrated
Optical Fiber Communication. OFC 97., Conference on; 03/1997
