Dispersion compensated 80 Gbit/s WDM transmission over 1171 kmstandard singlemode fibre

WDM transmission experiment at 80 Gbit/s (8×10 Gbit/s, 0.8 nm channel spacing) over 1171 km of standard singlemode fibre has been performed with a 90.1 km recirculating loop incorporating a dispersion compensation fibre and gain-equalising optical bandpass filters     

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.     

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     

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     

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     

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     

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.     

Compensation of 202 km single-mode fibre chromatic dispersion in 4Gbit/s optical CPFSK transmission experiment

Compensation for fibre chromatic dispersion in a coherent transmission system is demonstrated. A 4 Gbit/s optical CPFSK signal at 1.55 μm is transmitted through a 202 km conventional single-mode fibre. There is 1.8 dB degradation in transmission caused by fibre chromatic dispersion. This degradation has been completely compensated for using a delay equaliser with optical heterodyne detection     

459 km, 2.4 Gbit/s four wavelength multiplexing optical fibre transmission experiment using six Er-doped fibre amplifiers

A 2.4 Gbit/s, four WDM optical fibre transmission experiment over 459 km using six Er-doped fibre amplifiers in the 1.55 mu m wavelength region is presented. The results confirm the possibility of WDM multiple optical amplifier repeater transmission systems.<>     

Over 300 km CPFSK transmission experiment using 67 photon/bit sensitivity receiver at 2.5 Gbit/s

A nonrepeated fibre transmission experiment over 308 km of conventional optical fibre is reported at 2.5 Gbit/s in a CPFSK heterodyne detection system. The system has a sensitivity of -46.7 dBm or 67 photons/bit at 10/sup -9/ BER and has the maximum allowable attenuation of 55.1 dB without an optical amplifier.<>     

Single wavelength 40 Gbit/s transmission over 3.4 km broad wavelength window multimode fibre

For cost and design simplicity, various optical access network architectures have been proposed where downstream traffic from the optical line terminal to the optical networking unit is transmitted by carriers in the 1550 nm window and upstream traffic by those in the 1300 nm window. A new generation of multimode fibre has been designed to accommodate this requirement and to address technical challenges associated with fibre coupling. By restricting the number of modes at both fibre input and output using off-the-shelf singlemode transceivers, single-wavelength 40 Gbit/s data transmission over 3.4 km broad wavelength window multimode fibre has been demonstrated. A bandwidth distance product of 136 Gbit/s is achieved.     

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     

1 Gbit/s optical FSK heterodyne transmission experiment over 100 km of single-mode fibre

A 1 Gbit/s optical FSK modulation/heterodyne detection transmission experiment has been conducted at a wavelength of 1497 nm. The receiver sensitivity is ?37dBm and no degradation is observed after transmission through 100 km of single-mode fibre.     

Optical time-division multiplexed transmission system experiment at 8 Gbit/s

We describe the design and performance of an experimental two-channel optical time-division multiplexed fibre transmission system operating at a wavelength of 1.3 ?m and a bit rate of 8 Gbit/s. Transmission over 8 km of single-mode fibre with low crosstalk and transmission error rates as low as 10?10 is demonstrated.     

Dispersion-supported transmission at 20 Gbit/s over 53 km standardsinglemode fibre

The optical transmission of 20 Gbit/s signals over a record distance of 53 km standard nondispersion-shifted singlemode fibre (SMF) without optical dispersion compensation has been demonstrated successfully using a directly modulated MQW DFB laser operating at 1544 nm     

Wavelength-tunable 16 optical channel transmission experiment at 2Gbit/s and 600 Mbit/s for broadband subscriber distribution

Reports a 16 optical-channel single-mode fibre transmission experiment based on dense-WDM and tunable-etalon channel selection. Experiments at 2 Gbit/s and 600 Mbit/s over 10 km of single-mode fibre show little crosstalk penalty when the optical channel spacing is 2 nm. The system architecture is useful for high-capacity broadband subscriber distribution     

Coherent optical orthogonal frequency division multiplexing

Coherent optical orthogonal frequency division multiplexing is proposed to combat dispersion in optical media. It is shown that optical-signal-to-noise ratio penalty at 10 Gbit/s is maintained below 2 dB for 3000 km transmission of standard-singlemode fibre without dispersion compensation.     

Optical self-homodyne DPSK transmission at 1 and 2 Gbit/s over 86 km of fibre

Optical self-homodyne DPSK transmission has been achieved at 1 and 2 Gbit/s data rates with respective receiver sensitivities of ?34.4 dBm and ?32.4 dBm at 10?9 BER. No dispersion penalty was observed after transmission through 86 km of optical fibre with 17 ps/?m/km dispersion at the operating wavelength of 1.53 ?m.     

8 Gbit/s 202 km optical CPFSK transmission experiment using 1.3 mu m zero dispersion fibre

A wideband microstrip line delay equaliser and a wideband optical balanced receiver for multi-Gbit/s transmission were proposed. Using these devices, an 8 Gbit/s 202 km optical CPFSK transmission experiment with a 1.3 mu m zero dispersion fibre was conducted at the wavelength of 1.55 mu m. Fibre chromatic dispersion was successfully compensated by the equaliser.<>     

High speed 1.3 mm VCSELs for 12.5 Gbit/s optical interconnects

High speed 1.3 m vertical-cavity surface-emitting lasers for optical interconnects are presented. Error-free transmission over 3 km of standard singlemode fibre at data rates as high as 12.5 Gbit/s is demonstrated for the first time.