Repeated wavelength conversion of 10 Gb/s signals and convertedsignal gating using wavelength-tunable semiconductor lasers

Repeated wavelength conversion of 10 Gb/s pseudorandom nonreturn-to-zero signals is demonstrated using semiconductor lasers that can be tuned wavelength over a broad range. Error-free tunable wavelength conversion with a very low power penalty can be achieved in both first and second wavelength conversion over a broad wavelength range from 1.486-1.573 μm. The converted signal can be switched rapidly within this wavelength region. High-speed converted signal gating controlled by adjusting the bias current to the device active region is also demonstrated     

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     

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.     

Regenerative 20 Gbit/s wavelength conversion and demultiplexingusing a semiconductor laser amplifier nonlinear loop mirror

A nonlinear loop mirror containing a semiconductor laser amplifier is used to perform all-optical wavelength conversion and demultiplexing at 20 Gbit/s. This technique has a low polarisation sensitivity and offers a regenerative function where jitter in the received data is considerably reduced     

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     

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     

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.     

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     

4 Gb/s optical wavelength conversion using semiconductor opticalamplifiers

Semiconductor optical amplifiers used for efficient wavelength conversion up to 4 Gb/s are discussed. The rise and fall times as well as extinction ratio are experimentally analyzed. System performance at 4 Gb/s is evaluated showing a penalty of only 1.5 dB for the converted signal for conversion over 17 nm     

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.     

10 Gbit/s all-optical clocked decision circuit using two-sectionsemiconductor lasers

All-optical clocked decision, retiming, wavelength conversion and signal inversion is demonstrated at 10 Gbit/s using a two-section semiconductor laser     

10 Gbit/s data switched semiconductor laser amplifier nonlinearloop mirror

Error-free optical modulation of a regular stream of data pulses at 10 GHz by optical data at 10 Gbit/s is demonstrated using a semiconductor laser amplifier within a loop minor. This is achieved without patterning despite an amplifier recovery time of several bit periods by positioning the amplifier near to the centre of the loop. This approach removes sensitivity to the optical polarisation of incoming data     

10 Gbit/s Manchester-encoded FSK-labelled optical signal transmission link

An optical signal consisting of a 10 Gbit/s Manchester-encoded intensity-modulated (IM) payload and a 156 Mbit/s frequency-shift-keying (FSK) label was generated, and its performance was evaluated in an 80 km standard singlemode-fibre link. It is shown that the FSK/IM labelling performance is greatly improved through high-speed Manchester coding.     

Error-free wavelength conversion at 160 Gbit/s in PPLN waveguide at room temperature

Tunable wavelength conversion of a 160 Gbit/s signal by means of cascaded sum frequency generation/difference frequency generation was performed on a periodically-poled lithium niobate waveguide. Operation at room temperature (25degC) is demonstrated. A maximum power penalty of 2.1 dB for a bit error rate of 10^-9 was achieved over a wavelength range of 29 nm.     

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.     

Polarization-insensitive wavelength conversion up to 10 Gb/s basedon four-wave mixing in a semiconductor optical amplifier

Polarization-insensitive wavelength conversion at 2.5 and 10 Gb/s using four-wave mixing in a bulk semiconductor optical amplifier is reported. At 10 Gb/s, a conversion range from 6.4-nm wavelength downshift to 4.8-nm upshift has been demonstrated. The conversion efficiency and signal-to-noise ratio versus conversion range are also characterized     

Cascaded wavelength conversion by four-wave mixing in a strained semiconductor optical amplifier at 10 Gb/s

We demonstrate for the first time cascaded wavelength conversion by four-wave mixing in a semiconductor optical amplifier. Bit-error-rate performance of <10/sup -9/ at 10 Gb/s is achieved for two conversions of up to 9 nm down and up in wavelength. For two wavelength conversions of 5 nm down and up, a power penalty of 1.3 dB is measured. A system of two wavelength converters spanning 40 km of single-mode fiber is also demonstrated.     

Widely tunable 10 Gbit/s separate absorption and modulation Mach-Zehnder wavelength converter

A fully monolithic separate absorption and modulation region wavelength converter requiring no bias tees has been fabricated. The device consists of a transmitter comprising a sampled-grating DBR laser and series-push-pull Mach-Zehnder modulator, and a receiver composed of a linear semiconductor optical amplifier and a quantum well pin photodetector. The wavelength converter has a 13 GHz bandwidth and demonstrates error-free operation at 10 Gbit/s with unity gain