20 Gbit/s, 1.55 μm strained-InGaAsP MQW modulator integrated DFBlaser module

The high-speed (20 Gbit/s) and highly efficient (2 V peak to peak for a 22 dB on/off ratio) operation of an MQW integrated electroabsorption modulator/DFB laser module is demonstrated. Output power from the module is over +3 dBm in the pigtailed singlemode fibre. To the authors' knowledge, this is the first report of 20 Gbit/s operation with a monolithically integrated light source     

10 Gbit/s high performance MQW tandem modulator for solitongeneration and coding

Soliton generation and coding are obtained using a novel, and simple tandem integrated electroabsorption (EA) MQW modulator structure. Negligible electrical crosstalk (<40 dB) is obtained due to the integration between the modulators, of an optical amplifier based on the same active layer. This also allowed a very low fibre to fibre insertion loss of 9 dB. The device was operated at 10 Gbit/s     

Generation and coding of a 100 Gbit/s signal by an InP-basedoptical multiplexer integrated with modulators

The authors demonstrate a novel InP-based optical multiplexer integrated with MQW electroabsorption modulators for 100 Gbit/s transmission. A 100 GHz optical pulse train is generated and coded with a pseudorandom NRZ pattern     

Straight-line soliton data transmission at 20 Gbit/s beyondGordon-Haus limit

Soliton data signals at 20 Gbit/s have been successfully transmitted over 3000 km with the use of soliton control by synchronous modulation and optical filters. The installation of only one simple modulator makes it possible to extend the maximum transmission distance from 2300 km (without soliton control) to 3000 km which is clearly beyond the Gordon-Haus limit     

2.5 Gbit/s光孤子的产生及外调制

采用半导体的增益开关法成功地产生了２．５Ｇｂｉｔ／ｓ的孤子光脉冲并对其进行了外调制。对经过调制的孤子光脉冲进行了检测，分析了实验原理及结果。     

20 Gbit/s soliton transmission over 19 Mm using sliding-frequencyguiding filters

20 Gbit/s time-polarisation multiplexed solitons have been transmitted over 19 Mm in a recirculating loop with a 35 km amplification span using the sliding-frequency guiding filter soliton control technique. Soliton energy and sliding rate margin measurements are reported for 10 Mm     

20 Gbit/s soliton transmission using alternating dispersionarrangement in standard fibre systems

An alternating dispersion arrangement is proposed for soliton systems with dispersion compensation to improve soliton stabilisation. A transmission experiment at 20 Gbit/s over 2600 km long singlemode fibre was successfully demonstrated by employing this novel dispersion arrangement     

Demonstration of sliding-filter-controlled soliton transmission at20 Gbit/s over 14 Mm

Soliton transmission of a 20 Gbit/s time/polarisation multiplexed signal over 14 Mm path in a recirculating loop with 46.3 km amplification span has been demonstrated using the sliding-filter soliton control technique. Demultiplexing was achieved by using a polarisation-insensitive electroabsorption modulator     

Polarisation-independent 20 Gbit/s soliton data transmission over12500 km using amplitude and phase modulation soliton transmissioncontrol

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     

Ultrahigh-speed driverless MQW intensity modulator, and 20 Gbit/s, 100 km transmission experiments

An InGaArInAlAs MQW modulator with the low voltage of 1.5 V for 10 dB extinction ratio and 16 GHz bandwidth has been developed. This ultrahigh-speed modulator enables the modulator driver to be eliminated from the transmitter. 100 km transmission experiments have been carried out using either a 1 V peak to peak output monolithic-IC-driven modulator at 15 Gbit/s or a 2 V peak to peak output multiplexer-driven modulator at 20 Gbit/s. This is the first report on multigigabit operation of MQW modulators to the authors' knowledge.<>     

Error-free soliton transmission at 20 Gbit/s over 7150 km throughall-optical synchronous phase modulation

All-optical soliton synchronous phase modulation through transmission fibre is shown to enable error-free propagation of 20 Gbit/s signals up to 7150 km without the need for dispersion management. Tolerance to imperfect clock-signal synchronisation is characterised experimentally     

20 Gbit/s soliton transmission over transoceanic distances with a105 km amplifier span

20 Gbit/s soliton transmission over large distances (150000 km) is demonstrated in a recirculating loop with a record amplifier span of 105 km. For the first time, an electroabsorption modulator is used to provide the necessary in-line modulation control     

40 Gbit/s electroabsorption modulators with impedance-controlled electrodes

A novel travelling-wave electroabsorption optical modulator, electrically matched for 50 /spl Omega/ loads of driving circuit drivers, was developed. The scattering parameter of electric reflection (S/sub 11/) from this modulator is less than -20 dB at 20 GHz. It can thus enable a 40 Gbit/s, 2 km SMF transmission with a 0.3 dB penalty at a 1.3 /spl mu/m wavelength.     

40 Gbit/s OTDM soliton transmission over transoceanic distances

40 Gbit/s soliton transmission is achieved in a recirculating loop over 10000 km, for the first time to the authors' knowledge. With a single carrier wavelength. Propagation has been tested with and without polarisation multiplexing thanks to low polarisation dependency electroabsorption modulators for in-line control and for the time demultiplexing receiver     

160 Gbit/s soliton data transmission over 200 km

Polarisation- and time-domain-multiplexed 160 Gbit/s soliton signals have been successfully transmitted over 200 km for the first time. The soliton source was a 10 GHz regeneratively modelocked fibre laser and a planar lightwave circuit was used for optical multiplexing. The soliton pulse width was ~1.5 ps. A polariser and a nonlinear loop mirror were used for demultiplexing from 160 to 10 Gbit/s     

Monolithically integrated nonlinear Sagnac interferometer and itsapplication as a 20 Gbit/s all-optical demultiplexer

A Sagnac interferometer consisting of a semiconductor laser amplifier and a 3 dB coupler monolithically integrated within a waveguide loop mirror is fabricated and its application as a 20 Gbit/s all-optical demultiplexer is demonstrated     

A 1 Gbit/s integrated optical modulator

A waveguide directional coupler modulator is demonstrated with a bandwidth of 1 GHz and a rise time of 590 ps. An analysis of the electrical parasitics is presented and the device response is found to be transit-time limited. The scaling of the frequency response is shown to be characterized by a bandwidth-length product of 1.1 GHz - cm.     

2.8 Gbit/s optical soliton transmission employing all laser diodes

2.8 Gbit/s optical soliton transmission is successfully demonstrated using a gain-switched 1.55 mu m distributed feedback laser diode and a Ti:LiNbO/sub 3/ intensity modulator. An Er/sup 3+/-doped fibre amplifier and a Raman amplifier, both pumped by 1.47 mu m laser diodes, are employed to achieve intense optical pulses and fibre-loss compensation, respectively.<>     

1 Gbit/s automatic-power-control-free zero-bias modulation of very-low threshold MQW laser diodes

The first 1 Gbit/s, automatic-power-control-free zero-bias modulation has been successfully demonstrated using very low-threshold GaAs/AlGaAs MQW lasers. A stable multi-longitudinal mode oscillation due to zero-bias modulation was also observed. This result simplifies driving circuitry and is an important step towards realisation of high-speed and high-density optoelectronic integrated circuits.     

80 Gbit/s wavelength conversion using MQW electroabsorption modulator in delayed-interferometric configuration

Absorption recovery time and cross-phase modulation characteristics of an MQW electroabsorption modulator (EAM) were experimentally analysed. 80 Gbit/s error-free operation of a wavelength converter using the MQW EAM in a delayed-interferometer configuration was demonstrated for the first time.