1.6 Tbit/s (40 × 42.7 Gbit/s) WDM transmission over 2400 kmof fibre with 100 km dispersion-managed spans

Transmission of 40 × 42.7 Gbit/s WDM channels is demonstrated over 2400 km of fibre with 100 km amplifier spacing and 100 GHz channel spacing. Dispersion-managed fibre spans, carrier-suppressed return-to-zero modulation format and hybrid Raman/erbium-doped fibre inline amplifiers were employed to achieve a record 40 Gbit/s, WDM transmission distance with 100 km terrestrial span lengths     

Dispersion-free single-mode fibre transmission experiments up to 1.6 Gbit/s

Long-span single-mode fibre transmission experiments at 1.3 ?m have been refined toward higher digit rate and longer fibre span. Error-rate against receiving optical level characteristics showed that optical power penalties at 100 Mbit/s, 1.2 Gbit/s and 1.6 Gbit/s are negligible, even after 30 km, 23 km and 13 km fibre transmission, respectively.     

Bit error rate measurements of 14000 km 5 Gbit/s fibre-amplifier transmission system using circulating loop

An experimental technique was developed for measuring bit error rates in multi-thousand kilometre fibre amplifier systems using a circulating loop. A transmission distance of 14300 km at 5 Gbit/s and 21000 km at 2.4 Gbit/s was achieved using a nonreturn-to-zero pseudorandom data pattern. The bit rate distance product of the 5 Gbit/s result was 71 Tbit km/s.<>     

1.7 Gbit/s transmission over 165 km of dispersion-shifted fibreusing spectrum-sliced fibre amplifier light source

The authors have demonstrated 1.7 Gbit/s transmission over 165 km of dispersion-shifted fibre using a spectrum-sliced fibre amplifier light source. To the authors' knowledge, this represents the largest bit-rate distance product (280 Gbit/s km) ever demonstrated using an incoherent light source. The dispersion penalty was very small (~0.3 dB) even at a wavelength 10 nm away from the dispersion-zero wavelength of the fibre     

Fibre transmission of 10 Gbit/s signals following wavelengthconversion using a travelling-wave semiconductor optical amplifier

The wavelength of an intensity-modulated signal at 10 Gbit/s was translated from 1546 to 1531 nm using cross gain-compression in a semiconductor optical amplifier. The shifted signal was transmitted with less than 1 dB penalty over a 121 km span of dispersion-shifted fibre with two in-line amplifiers. A dispersion penalty of nearly 2 dB is measured for transmission of 6 Gbit/s data over 20 km conventional fibre     

2.5 Gbit/s transmission of spectrum-sliced fibre amplifier lightsource channels over 200 km of dispersion-shifted fibre

Transmission of 2.5 Gbit/s spectrum-sliced fibre amplifier light source channels over 200 km of dispersion-shifted fibre (DSF) has been achieved, the highest bit-rate distance product 500 Gbit/s km using incoherent light sources reported to our knowledge. The total power penalty was as low as 0.2 dB for the 1.8 nm bandwidth channel centred at the zero-dispersion wavelength of DSF     

Gbit/s transmission experiments with a 1.3 ?m high-speed surface-emitting LED and multimode graded-index fibre

Using a 1.3 ?m wide-bandwidth surface-emitting LED, transmission experiments were performed with 50/125 ?m multimode, graded-index fibre. Pulse shaping and equalisation were used in achieving a 10-9 bit-error rate at 1.0 Gbit/s over 3.0 km with a system margin of 1.1 dB. At 500 Mbit/s the margin increased to 7.0 dB. The 3.0 Gbit km/s data rate-distance product represents a new level of performance for a surface-emitting LED and multimode fibre.     

16 Gbit/s fibre transmission experiment using optical time-division multiplexing

An experimental four-channel optical time-division multiplexed transmission system is described, and the first demonstration of fibre transmission at a bit rate of 16Gbit/s is reported. In this experiment, data at 16Gbit/s have been transmitted over 8 km of fibre with a bit error rate below 10-9.     

1.2 Gbit/s, 52.5 km optical fibre transmission experiment usingOEICs on GaAs-on-InP heterostructure

High-performance, long-wavelength OEICs on a GaAs-on-InP heterostructure were fabricated. For the transmitter OEIC, high-speed operation up to 2.4 Gbit/s was achieved, and a receiver sensitivity as high as -26.0 dBm for a 1.2 Gbit/s NRZ signal was realised for the receiver OEIC. To confirm the usefulness of these OEICs for optical fibre networks, a 1.2 Gbit/s optical fibre transmission experiment was successfully carried out over a 52.5 km span     

40 Gbit/s straight-line RZ data transmission over 240 km ofstandard fibre

The authors report straight-line single-channel 40 Gbit/s RZ data transmission over 240 km of standard fibre with periodic dispersion compensation. To the authors' knowledge, this is the longest transmission distance reported in a straight-line transmission experiment, at 40 Gbit/s without any precoding. The back-to-back receiver sensitivity of the system was 18.9 dBm for a BER of 10^-9 . Transmitting data over 240 km of fibre induced a sensitivity penalty of 0.4 dB for a BER of 10^-9     

BER performance improvement by forward error correcting code in 5Gbit/s 9000 km EDFA transmission system

Forward error correction (FEC) has been used to improve the bit error rate performance of a 5 Gbit/s 9000 km erbium-doped fibre amplifier (EDFA) transmission line. The results using a 5 Gbit/s prototype optical transmission terminal showed extremely small penalty in BER performance after 9000 km transmission     

Optical time-division multiplexing and demultiplexing in a multigigabit/second fibre transmission system

We demonstrate an optical time-division-multiplexed fibre transmission system using actively mode-locked InGaAsP injection lasers and high-speed Ti:LiNbO3 switch/modulators. Two 2Gbit/s return-to-zero data streams are optically multiplexed to 4Gbit/s, transmitted through 8 km of fibre, optically demultiplexed and detected with low error rate.     

Power budget optimisation of WDM network with MSCM control

The authors have experimentally demonstrated a 28.7 dB power budget for simultaneous transmission of 2.5 Gbit/s/node payload data and 80 Mbit/s/node control channels using the multichannel subcarrier multiplexing (MSCM) signalling technique. The power budget is sufficient to support a 234 node MSCM-WDM network with 2.5 Gbit/s/node 10 km radius coverage and 0.25 dB/km fibre attenuation with 0.45 dB/km attenuation, the network can support up to 93 nodes     

80 Gbit/s pulsewidth-maintained wavelength conversion based on HNLDSF-NOLM including transmission over 80 km of conventional SMF

80 Gbit/s pulsewidth-maintained wavelength conversion based on a high-nonlinearity dispersion shifted fibre nonlinear optical loop mirror (DSF-NOLM) is realised and penalty-free transmission over 80 km conventional single mode fibre and 12 km dispersion compensating fibre of the converted signal is demonstrated for the first time     

DFB laser monolithically integrated with an absorption modulator with low residual reflectance and small chirp

Transmission over 150 km of standard fibre at 5 Gbit/s, and over 75 km at 8 Gbit/s, is reported with a monolithically integrated DFB laser and Franz-Keldysh absorption modulator. The modulator facet reflectance is low. The device is stable over a range of operating parameters. The butt-joint, buried-heterostructure device is entirely grown by MOVPE.<>     

Does multimode fibre have a future in data-communications?

The worst case Shannon capacities of OM1, OM2 and OM3 multimode fibre types are calculated. The worst case capacity length products are estimated to be 15 Gigabit per second kilometres (Gbit/s.km) for a single wavelength channel at 1300 nm wavelength and 60 Gbit/s.km for OM3 for operation at 850 nm wavelength     

640 Gbit/s (32×20 Gbit/s) WDM transmission with 0.4(bit/s)/Hz spectral efficiency using short-period dispersion-managedfibre

640 Gbit/s (32 channel×20 Gbit/s) WDM transmission with 0.4 (bit/s)/Hz spectral efficiency is demonstrated using short-period dispersion-managed fibre (Perfect Cable^TM). The average Q-factor was measured to be better than 18 dB after transmission over 280 km     

High-speed bi-directional polarisation division multiplexed opticaltransmission in ultra low-loss (1.3 dB/km) polarisation-maintainingphotonic crystal fibre

A high-speed optical transmission experiment was successfully demonstrated in an ultra low-loss polarisation maintaining photonic crystal fibre. The fibre loss and modal birefringence at 1550 nm were 1.3 dB/km and 1.4×10^-3, respectively. A 10 Gbit/s bi-directional optical signal was successfully transmitted through the 1.5 km fibre     

160 Gbit/s wavelength shifting and phase conjugation usingperiodically poled LiNbO3 waveguide parametric converter

High efficiency 160 Gbit/s wavelength conversion and optical phase conjugation using cascaded nonlinearities in periodically poled LiNbO ₃ waveguides is reported. The authors also report on use of this device as a dispersion compensator for transmission of 100 Gbit/s OTDM data through 160 km of singlemode fibre     

2/spl times/40 Gbit/s RZ-DQPSK transmission with tunable chromatic dispersion compensation in 263 km fibre link

2/spl times/40 Gbit/s RZ-DQPSK transmission over a 263 km fibre link with back-to-back receiver sensitivity of -27.5 dBm and Q factor >20 dB is demonstrated. The experiment demonstrates sufficient resilience against nonlinear phase noise and band limitation in a 40 Gbit/s WDM DEMUX with Q=17.5 dB.