All-optical wavelength conversion at 160 Gbit/s using SOA and silicon-on-insulator photonic circuit

Error-free operation of an all-optical wavelength converter at 160 Gbit/s based on a semiconductor optical amplifier and a silicon-on-insulator photonic circuit, consisting of two cascaded Mach-Zehnder delay interferometers, is demonstrated.     

基于PPLN光波导的全光波长转换技术

文章从理论和实验两方面论述了一种新颖的基于无源光波导的级联二阶非线性效应型全光波长转换(AOWC)技术，采用50mm长的周期域反转LiNBO3(PPLN)光波导，实现了在1．55μm波段的超过70nm的波长转换带灾，并验证了其多波长信道同时转换的能力。     

Bit error rate performance for wavelength conversion at 20 Gbit/s

Wavelength conversion at 20 Gbit/s, to longer and shorter wavelength, is achieved using cross gain-compression in a semiconductor optical amplifier. Quantitative performance is assessed from the bit error rate data at 20 Gbit/s, for the first time for any wavelength conversion scheme. For conversion of 10 nm to a shorter wavelength, the penalty is 2.6 dB     

20 Gbit/s wavelength conversion using semiconductor nonlinearity

A polarisation insensitive wavelength conversion of 20 Gbit/s data signals over a range of 12 nm has been demonstrated using nonlinear processes (cross-phase modulation) in a travelling wave semiconductor laser amplifier and a polarisation nulling technique     

Error-free operation of wavelength conversion laser for photonic crossconnect node at 125 Mbit/s

Error-free operation of a wavelength conversion laser diode (WCLD) is demonstrated. The optical input/output interface scheme of the WCLD has been examined and wavelength switching at a data rate of 125 Mbit/s has been experimented on. Good error rates below 10/sup -10/ and a small sensitivity degradation of 2.0 to 2.9 dB were achieved.<>     

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     

100 Gbit/s all-optical wavelength conversion with integrated SOAdelayed-interference configuration

The authors report all-optical 100 Gbit/s wavelength conversion employing cross-phase modulation for the first time. We use a fully integrated and packaged SOA delayed-interference configuration (SOA-DI) that comprises a monolithically integrated delay loop, phase shifter and tunable coupler. Only one input and one output fibre is needed to operate the device, which simplifies packaging     

40 Gbit/s pulsewidth-maintained wavelength conversion based on ahigh-nonlinearity DSF-NOLM

The authors present results showing that walkoff and dispersion effects are reduced when only 1 km HNL-DSF fibre is used in a nonlinear optical loop mirror (NOLM). Broadband and pulsewidth-maintained wavelength conversion at 40 Gbit/s based on a high-nonlinearity DSF-NOLM is obtained     

Repeated wavelength conversion of 10 Gbit/s signal usingwavelength-tunable semiconductor lasers

Repeated wavelength conversion of 10 Gbit/s pseudorandom non-return-to-zero signals is demonstrated using superstructure grating distributed Bragg reflector lasers operating in the 1.55-μm wavelength region. Error-free and very low-power-penalty wavelength conversion can be achieved in both first and second wavelength conversion for a fixed converted wavelength over a broad wavelength range from 1.486 to 1.573 μm (about 90-nm wide). The power penalty of the transmitted signal light through the first wavelength conversion device increases when the converted wavelength is switched from 1.544 to 1.573 μm periodically at a repetition frequency of 40 MHz. The increase in power penalty, however, is less than 6 dB even when the bit error rate is 10^-12     

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.     

Dual-channel-output all-optical logic AND gate at 20 Gbit=s based on cascaded second-order nonlinearity in PPLN waveguide

Proposed and demonstrated is a novel scheme of a dual-channel-output all-optical logic AND gate. Using cascaded sum- and difference-frequency generation in a periodically poled lithium niobate (PPLN) waveguide, 20 Gbit/s logic AND operation with dual-channel outputs is successfully observed in the experiment.     

Error-free external modulation of a single-frequency injection laser at 1.5 Gbit/s using a Ti:LiNbO3 waveguide switch

We have used a packaged high-speed Ti:LiNbO3 directional coupler switch to externally modulate a CW-operated cleaved-coupled-cavity laser oscillating at 1.3 ?m wavelength. The performance of the modulator was evaluated by measuring bit error rates for the dominant mode of the laser using a monochromator as a selective bandpass filter. Error-free encoding was achieved for a non-return-to-zero rate of 1.5 Gbit/s. This result and observation of the optical spectrum demonstrate that the external modulation did not degrade the CW characteristics of the laser.     

All-optical wavelength conversion with multicasting at 6/spl times/10 Gbit/s using electroabsorption modulator

All-optical wavelength conversion with multicasting has been demonstrated with a single electroabsorption modulator based on cross-absorption modulation. It is shown that the input signal wavelength can simultaneously convert to six different wavelengths at 10 Gbit/s, and the relation between the power penalty and the number of simultaneously operating channels is investigated.     

160 Gbit/s SOA all-optical wavelength converter and assessment of its regenerative properties

The retiming and reshaping properties of a 160 Gbit/s all-optical wavelength converter based on a semiconductor optical amplifier gating delay interferometer configuration is investigated. 160 Gbit/s operation is performed with as little as -3.5 dBm input signal.     

OTDM-based optical communications networks at 160 Gbit/s and beyond

The virtually unlimited bandwidth of optical fibers has caused a great increase in data transmission speed over the past decade and, hence, stimulated high-demand multimedia services. Nowadays, opto-electronic conversion is still required at each network node to process the incoming signal. However, when the single channel bit rate increases beyond electronic speed limit, optical time division multiplexing (OTDM) becomes a forced choice, and all-optical processing must be performed to extract the information from the incoming packet. In this paper the state of art, the advantages and drawbacks of the OTDM technology will be discussed in order to highlight its potentialities in different application scenarios for optical communications networks, and its perspectives in different temporal horizons. In detail, a recent experiment of a 160 Gbit/s OTDM system is presented. Furthermore, a photonic node architecture suitable for optical packet switching networks is proposed, and possible solutions for the implementation of all the required subsystems are presented and compared in order to optimize the node performance. In particular innovative schemes for optical add/drop multiplexer, optical logic gates, optical switches, and optical flip-flop are introduced with a particular emphasis on emerging nonlinear materials and enabling technologies.     

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     

80 Gbit/s wavelength conversion using semiconductor optical amplifier and optical bandpass filter

A wavelength converter is presented that is made out of a semiconductor optical amplifier and an optical bandpass filter. Error-free inverted wavelength conversion is demonstrated at a bitrate of 80 Gbit/s. This approach can be exploited at higher bitrates. A clear open eye indicating error-free wavelength conversion at 160 Gbit/s is also presented. This wavelength converter has a simple configuration and allows photonic integration.     

Polarisation insensitive wavelength conversion of 10 Gbit/s signalswith SOAs in a Michelson interferometer

Polarisation insensitive wavelength conversion is demonstrated with a new configuration in which semiconductor optical amplifiers (SOAs) are placed in a Michelson interferometer. Wavelength conversion of 10 Gbit/s signals is achieved with an improvement of the on/off ratio from 10 to 13 dB, although the conversion is from shorter to longer wavelengths     

2.5Gbit/s交叉增益型全光波长转换的实验研究

利用自行研制的半导体光放大器对交叉增益型波长转换器进行了实验研究.实现了速率为2.5Gbit/s的1549.8nm到1562.6nm波长上转换.比较了不同调制格式、不同泵浦功率条件下的转换输出功率、消光比和噪声特性,并对实验的结果作了解释.