Soliton Data Transmission Research Articles

40 Gbit/s Soliton Transmission Field Experiment Using Dispersion Management.

We report 40 Gbit/s soliton transmission field experiments over 1, 000 km in the Tokyo metropolitan optical loop network. The network consists of dispersion-shifted fibers. We employed a dispersion compensation technique to keep the average dispersion at a small constant value of 0.05 ps/km/nm and this resulted in an error-free 5 ps soliton data transmission over 1, 000 km. When in-line synchronous modulation was employed at 680 km, the transmission distance was extended to 1, 360 km.

Single channel 40 Gbit/s soliton transmission fieldexperiment over 1000 km in Tokyo metropolitan optical loop network using dispersioncompensation

The authors describe a 40 Gbit/s soliton transmission experiment over 1000 km using part of the Tokyo metropolitan optical loop network. The network consists of conventional dispersion-shifted fibres. A dispersion compensation technique was used to keep the average dispersion at a small constant value and this resulted in error-free 5 ps soliton data transmission over 1000 km. The power penalty at a bit error rate of 1 × 10–10 was between 1.7 and 2.4 dB.

10 Gbit/s, 10600 km, dispersion-allocated solitontransmissionusing conventional 1.3 µm singlemode fibres

Describes 100bit/s soliton data transmission at 1.55 /spl mu/m over 10600 km through the use of a dispersion-allocated soliton technique and 1.3 /spl mu/m single-mode fibres. The maximum transmission distance was 9200 km when the amplifier spacing was extended to 59 km. This result is very interesting as it shows that conventional SMF is applicable even to transoceanic systems, and may enable system cost to be reduced.

Optical soliton transmission technology

In this paper, we describe soliton transmission experiments at 20-40 Gbit/s over 1000 km and new soliton transmission technologies. The experimental setup for the soliton data transmission is shown. 20 Gbit/s pulses were obtained by using an optical multiplexing technique with two 3 dB fiber couplers. For the 40 Gbit/s transmission experiment, a polarization multiplexing technique was used, which enabled the bit rate to be doubled. >

Polarisation-independent 20 Gbit/s soliton datatransmissionover 12 500 km using amplitude and phase modulationsoliton transmission control

Polarisation-independent error-free 20 Gbit/s soliton data transmission over 12500 km, with flat system Q dependence on distance, has been demonstrated using static filtering and a semiconductor polarisation-independent amplitude and phase modulator for soliton transmission control.

80 Gbit/s soliton data transmission over 500 kmwith unequalamplitude solitons for timing clock extraction

Single-polarisation 80 Gbit/s soliton data signals have been successfully transmitted over 500 km. The soliton source was a modelocked fibre laser and a planar lightwave circuit was used for stable optical multiplexing. A nonlinear loop mirror was used for demultiplexing, in which unequal amplitude solitons were used for clock extraction.

Feasibility demonstration of 20 Gbit/s single channelsolitontransmission over 11500 km using alternating-amplitudesolitons

Single-carrier, single-polarisation 20 Gbit/s soliton data transmission over 11500 km with BER below 10/sup -9/ has been experimentally demonstrated using alternating-amplitude solitons and optical time-division multiplexing. This is the first report showing the feasibility of 230 Tbit/skm transmission capacity by single channel 20 Gbit/s soliton transmission using conventional optical amplifier systems. >

10 Gb/s, over 12200 km soliton data transmission with alternating-amplitude solitons

We have experimentally demonstrated 10 Gb/s soliton data transmission over 12200 km without inline soliton controls, for the first time. The use of alternating-amplitude solitons and optical time-division multiplexing/demultiplexing was effective both in reducing the soliton interactions and in expanding the jitter tolerance of the optical receiver. 122 Tb/s/spl middot/km is the highest rate-distance product yet reported in a soliton transmission experiment without inline soliton controls. >

Experimental demonstration of soliton data transmission over unlimited distances with soliton control in time and frequency domains

A 29 – 1 pseudorandom-binary-sequence soliton signal has been transmitted experimentally over one million km for the first time with no degradation in the bit error rates. The synchronous modulator was driven by a timing clock signal extracted from the transmitting data signal. These results mean that it is possible to send soliton data signals over unlimited distances through the use of soliton control in the time and frequency domains.

20 Gbit/s, 1020 km penalty-free soliton data transmission using erbium-doped fibre amplifiers

Optical soliton data signals at 20 Gbit/s have been successfully transmitted for the first time over a 1020 km-long dispersion-shifted fibre. Erbium-doped fibre amplifiers were installed as optical 1R repeaters at every 50 km. A bit error rate of below 10/sup -12/ was obtained with 2/sup 23/-1 pseudorandom patterns under a penalty-free condition. >

Ultra-Short Pulses for Optical Soliton Transmission. New Approach from External Modulation.

Mode-locking and gain-switching of semiconductor lasers have been reviewed from a view point of an optical short pulse generator for soliton transmission. A new approach from an external modulation using an electroabsorption modulator to generation of transform- limited optical short pulses is demon-strated. Transform-limited optical pulses up to 20 GHz repetition rates were generated just using a sinusoidal modulation of an InGaAsP electroabsorption modulator without any optical resonators and optical filters. The shape of the modulator-generated pulse is very closed to sech2 shape, and both the pulse width and the repetition rate can be easily varied by electrical signals. The promising future of the simple and stable optical pulse generation using the electroabsorption modulator was confirmed by 2.5 Gb/s-6400 km soliton data transmission using circulating loop experiments.

10 Gbit/s soliton data transmission over one million kilometres

Soliton data transmission at 7.2–10 Gbit/s over one million kilometres has been successfully achieved by using a new technique that incorporates synchronous shaping and retiming using a high speed optical modulator. This technique enables the Gordon–Haus limit, the accumulation of amplified spontaneous emission, and the effect of interaction forces between adjacent solitons to be overcome. This technique is analogous to the synchronously pumped laser technique and can extend the soliton transmission distance almost infinitely.

20 Gb/s optical soliton data transmission over 70 km using distributed fiber amplifiers

20 Gb/s optical soliton data transmission is demonstrated over 70 km. Highly efficient distributed Raman amplifiers for fiber-loss compensation are realized by using high Delta n dispersion-shifted single-mode fibers pumped by laser diodes. To achieve high bit rate transmission, optical multiplexing and demultiplexing techniques are also employed. The bit error rate (BER) performance dependence on the input peak power of the optical pulse is measured. No power penalty can be seen at the input peak power required for transmitting optical solitons while the BER performance degrades when decreasing the input peak power.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

4 Gb/s soliton data transmission over 136 km using erbium doped fiber amplifiers

The use of semiconductor-laser-pumped erbium-doped fiber amplifiers and an externally modulated mode-locked external-cavity semiconductor laser to obtain soliton data transmission at 4 Gb/s over 136 km of nondispersion shifted fiber is described. After 136 km of transmission and at low pulse powers, the approximately 80 ps fiber input pulse width was broadened to approximately 150 ps. At high pulse powers the output pulse width was maintained at 80 ps, as expected for N=1 solitons. N=3 solitons were also observed at lower data rates. >