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     

2.5 Gbit/s-9720 km, 10 Gbit/s-6480 km transmission in the FSAcommercial system with 90 km spaced optical amplifier repeaters anddispersion-managed cables

The authors report 2.5 and 10 Gbit/s transoceanic distance transmission in a commercial FSA optical amplifier system which has 90 km repeater spacing. The unique fibre dispersion management technique and amplifier passband management scheme used in the system are successfully demonstrated. The SNR improvement achieved with polarisation scrambling is also reported     

800 Gbit/s (80×10.66 Gbit/s) transmission over 3200 km ofnon-zero dispersion shifted fibre with 100 km amplified spans employingdistributed Raman amplification

80×10.66 Gbit/s wavelength division multiplexing transmission over 3200 km fibre with 100 km amplifier spacing and 50 GHz channel spacing is demonstrated. Error-free transmission of all 80 channels is achieved by employing distributed Raman amplification, forward error correction and low dispersion slope TrueWave^R fibre     

Full-Field Electronic Dispersion Compensation of a 10 Gbit/s OOK Signal Over 4$,times,$ 124 km Field-Installed Single-Mode Fibre

We experimentally demonstrate the use of full-field electronic dispersion compensation (EDC) to achieve a bit error rate of 5times10^{- 5} at 22.3 dB optical signal-to-noise ratio for single-channel 10 Gbit/s on-off keyed signal after transmission over 496 km field-installed single-mode fibre with an amplifier spacing of 124 km. This performance is achieved by designing the EDC so as to avoid electronic amplification of the noise content of the signal during full-field reconstruction. We also investigate the tolerance of the system to key signal processing parameters, and numerically demonstrate that single-channel 2160 km single mode fibre transmission without in-line optical dispersion compensation can be achieved using this technique with 80 km amplifier spacing and optimized system parameters.     

10 Gbit/s transmission by two channel WDM over a 908 km, sevenoptical amplifier line

Two channel wavelength division multiplexing (WDM) over a 908 km path with seven in-line erbium doped fibre amplifiers (EDFAs) is reported. At the 10 Gbit/s transmission level the line exhibited a good performance margin and significant robustness to simulated faults. To the authors' knowledge, this is the longest amplifier spacing reported in a system of this length at this line rate     

Characteristics of Gbit/s optical receiver sensitivity and long-span single-mode fiber transmission at 1.3 µm

Sensitivity of a 1.3 μm Ge APD receiver was measured at data rates ranging from 100 Mbits/s to 2 Gbits/s, using a high-speed GaAs FET RZ driver, low-noise Si bipolar transistor (BIT) receiver amplifier, and a highly sensitive TD comparator. The required received optical level at a 10^-9error rate was -31.9 dBm for 2 Gbits/s with a Ge APD/Si BIT front end having a 50 Ω input impedance. A Ge APD/ GaAs FET front end, with a 500 Ω input impedance, brought about 2 dB improvement at 100 Mbits/s, as compared with a Ge APD/Si BIT (50 Ω) front end. A coupling loss of 4 dB, achieved by a hemispherical microlens tipped on a single-mode fiber, and a low fiber loss of 0.57 dB/km, including splice loss, enabled 44.3 km single-mode fiber transmission at 2 Gbits/s. The 1.3 μm transmission system has a data rate repeater-spacing product of 88.6 (Gbit/s)km. Prospects of Gbit/s receiver sensitivity and the 2 Gbit/s transmission system, with more than 50 km repeater spacing, are also discussed.     

Maximum transmission capacity of a soliton communication system with lumped amplifiers

For a soliton transmission system which uses lumped optical amplifiers with a fixed amplifier spacing and a fixed bit rate, the optimum input pulse width and input amplitude are presented to maximise the soliton transmission distance. In a 10 Gbit/s soliton system with a repeater spacing of 40 approximately 50 km, a pulse width of 20 ps, and an amplitude of 1.4 approximately 1.8, the limitation owing to mutual soliton interaction is negligible compared with that resulting from the interaction between amplifier noise and the soliton pulse, and the soliton pulse can propagate up to the Gordon-Haus limit.<>     

北电网络TN—6410Gbit／s传输平台与多波长光中继器及其应用

北电网络的新型１０Ｇｂｉｔ／ｓ Ｓ／ＤＭＳ传输节点系统面向宽带传输的需求,可支持１０Ｇｂｉｔ／ｓ群路速率接口和低速１５５Ｍ、６２Ｍ和２．５Ｇｂｉｔ／ｓ等支路端口卡。其多波长光中继器系统（ＭＯＲ／ＭＯＲ＋）采用双向多波长放大器,在单根光纤上支持１６或３２波ＤＷＤＭ传输。二者的结合可使运营商利用现有的光纤,在满足高性能传输及高效率管理的同时,实现最低的每比特每公里传输成本。     

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     

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     

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.<>     

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     

1.7 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     

1700 km transmission at 40 Gbit/s with 100 km amplifier spacingenabled by higher-order-mode dispersion compensation

Transmission at 40 Gbit/s over 1700 km of non-zero dispersion fibre with 100 km amplifier spacing is reported for the first time. The demonstration is enabled by an all-fibre higher-order-mode dispersion-compensating module (HOM-DCM) and distributed Raman amplification     

1 Tbit/s (111 Gbit/s/ch X 10 ch) no-guard-interval CO-OFDM transmission over 2100 km DSF

Spectrally efficient (2bit/s/Hz) 1 Tbit/s DWDM transmission of 111 Gbit/s no-guard-interval PDM CO-OFDM signals with 50 GHz spacing over DSF is demonstrated. The record transmission distance of 2100 km was achieved for a 100 Gbit/s-data-rate CO-OFDM system.     

Transmission of 10 Gbit/s directly modulated DFB signals over 200km standard fibre using mid-span spectral inversion

Dispersion compensation by mid-span spectral inversion has been used to achieve the transmission of 10 Gbit/s signals from a directly modulated DFB over 200 km dispersive fibre. The spectral inversion is provided by nondegenerate four-wave mixing in a semiconductor optical amplifier     

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     

A novel duplex WDM-PON with DPSK modulated downstream and re-modulation of the downlink signal for OOK upstream

We experimentally demonstrate and analyze a 10 Gbit/s full duplex wavelength division multiplexing passive optical network (WDM-PON) system. A non-return-to-zero differential phase shift keying (NRZ-DPSK) modulation technique is first utilized for downlink direction, and then the downlink signal is re-modulated for the uplink direction using intensity modulation technique of on-off keying (OOK) with a data rate of 10 Gbit/s per channel. An effective colorless WDM-PON full duplex transmission system is achieved for the data rate of 10 Gbit/s per channel with a channel spacing of 60 GHz over the distance of 25 km with low power penalty.     

5 Gbit/s, +10 dBm lossless transmission in 10 km distributed erbium fibre amplifier

The first data transmission over a distributed erbium-doped fibre amplifier is reported. A +10 dBm input signal, intensity modulated at 5 Gbit/s has been transmitted without loss or distortion over a 10 km fibre, pumped with a total of 50 mW pump power at 1485 nm.<>     

Inline frequency-non-degenerate phase-sensitive fibre parametric amplifier for fibre-optic communication

Error-free transmission of 2.5 Gbit/s data over 60 km of dispersion-compensated standard single-mode fibre is demonstrated by using an inline phase-sensitive fibre-parametric amplifier and double-sideband data modulation format. The power penalty for the phase-sensitive amplifier was found to be <0.5 dB compared to back-to-back for bit-error-rate >10/sup -6/ and <2 dB compared to that for an equivalent phase-insensitive fibre-parametric amplifier of the same gain.