All-optical in-band OSNR monitoring at 40 Gb/s using a nonlinear optical loop mirror

We present an all-optical in-band optical signal-to-noise ratio (OSNR) monitor using a nonlinear optical loop mirror. Monitoring is enabled from the nonlinear power transfer function of the loop mirror. Experimental results are provided at 40 Gb/s for three modulation formats: nonreturn-to-zero, carrier-suppressed return-to-zero, and return-to-zero. The monitor discriminates the various OSNR levels over a dynamic range of more than 25 dB with every modulation format.     

All-optical Gbit/s switching using nonlinear optical loop mirror

The switching of a 20 Gbit/s pulse train at 2.5 Gbit/s in an all-fibre NOLM is demonstrated. An entirely semiconductor case powered configuration was used with a long loop (6.4 km) ensuring low power (10 mW) for the switching pulses.<>     

All-optical wavelength conversion of short pulses and NRZ signalsbased on a nonlinear optical loop mirror

Wavelength conversion of short pulses at 10 GHz based on a nonlinear optical loop mirror (NOLM) is experimentally and numerically investigated for the case of small group velocity dispersion and walkoff between the control pulses and continuous lightwaves. Experimental and numerical simulation results show that the pulsewidths of the converted signals at different wavelengths are almost the same, and the pulsewidths are compressed when the peak power of the control pulse is smaller than a certain value. An RZ optical source containing eight wavelengths having a high sidemode suppression ratio, equal amplitudes and almost the same pulsewidths is obtained by using wavelength conversion in a NOLM consisting of a common dispersion shifted fiber. 10 Gb/s NRZ wavelength conversion based on the NOLM is demonstrated for the first time and certain conclusions in some of the references are confirmed by our experimental results     

All-optical 1.5 μm to 1.3 μm wavelength conversion in awalk-off compensating nonlinear optical loop mirror

We demonstrate highly efficient all-optical conversion from 1.5 μm to 1.3 μm using a novel nonlinear optical loop mirror that compensates for walk-off. We make the fiber loop by splicing alternating segments of standard single-mode and dispersion-shifted fibers and choose their lengths such that the walk-off of the 1.3 μm and 1.5 μm pulses in one segment is completely reversed in the adjacent segment. We also show that the width of the converted pulses can be tailored by this scheme     

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     

All-optical wavelength conversion using a pulse reformatting optical filter

We introduce a general concept for the design of all-optical wavelength converters with pulse reformatting functionality. The novel wavelength converters are based on a single semiconductor optical amplifier followed by an optical filter. A microelectromechanical system-based realization is shown and simultaneous 40 Gb/s wavelength conversion, switching and signal format conversion is demonstrated. The new pulse reformatting optical filter device outperforms current schemes with respect to input-power requirements, input-power dynamic range and signal quality.     

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.     

基于非线性光纤环镜的全光波长变换器性能分析

非线性光纤环镜是一种很有前途的全光波长变换装置。介绍了利用光束传输法（ＢＰＭ） 对耦合非线性薛定谔方程组进行数值解析,详细讨论了对变换信号质量起作用的因素,包括泵浦光脉冲与信号光脉冲之间的走离和初始时延、光纤长度、向长波长变换和向短波长变换等。结果表明,适当的初始时延可以补偿走离的影响,适当增加光纤长度可以改善脉冲波形。     

Hybridization platform assembly and demonstration of all-optical wavelength conversion at 10 Gb/s

The development of a high-performance hybrid integration platform is demonstrated using an all-optical wavelength converter based on an integrated semiconductor optical amplifier (SOA) Mach-Zehnder interferometer (MZI). The device structure, transfer functions, power penalties and regenerative properties are presented for data rates up to 10 Gb/s.     

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     

All-optical wavelength translation over 80 nm at 2.5 Gb/s usingfour-wave mixing in a semiconductor optical amplifier

Wavelength conversion using conventional single pump four-wave mixing in semiconductor optical amplifiers is limited to wavelength shifts of a few tens of nanometers due to the decrease of signal-to-noise ratio with wavelength shift. In this letter, we demonstrate an 80-mn wavelength shift with four-wave mixing (FWRW) using two orthogonally polarized pumps. The power penalty at a 10^-9 bit-error rate for a 2.5-Gb/s signal is less than 1.0 dB. This result demonstrates the large wavelength shift capacity of this (FWM) technique     

Signal-to-noise ratio analysis of 100 Gb/s demultiplexing usingnonlinear optical loop mirror

This paper investigates experimentally and theoretically the signal-to-noise ratio (SNR) characteristics of 100 Gb/s all-optical demultiplexing using a nonlinear optical loop mirror (NOLM). The analysis takes into account two effects that degrade the SNR associated with NOLM demultiplexing. First is channel crosstalk originating from the leakage of nontarget channels. Second is the intensity fluctuations of demultiplexed signals caused by the combined effects of timing jitter and a profile of the switching window. Considering these two effects, power penalties associated with NOLM. Demultiplexing are theoretically evaluated using the conventional noise theory of an optical receiver followed by an optical preamplifier. Experimental results of bit error rate measurements for 100 Gb/s demultiplexing using three different NOLMs with different intrinsic crosstalk values, defined by signal transmittance in the absence of control pulses, show that the power penalties are in good agreement with the evaluation based upon our proposed analysis. It can be found from our investigation in demultiplexing from 100 to 10 Gb/s that intrinsic crosstalk of less than -25 dB, corresponding to a coupling ratio, K, of |K-0.5|⩽0.03, is required for the power penalty of less than 1 dB. The root-mean-square (rms) value of the relative timing jitter necessary for obtaining a sufficient timing tolerance width for combining control and signal pulses is determined     

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     

40-Gb/s all-optical wavelength conversion based on a nonlinearoptical loop mirror

All-optical wavelength conversion based on a nonlinear optical loop mirror (NOLM) at 40 Gb/s is demonstrated for the first time. The effect of walkoff time between control beam and signal beams is investigated when the NOLM is used as an all-optical wavelength converter or an all-optical demultiplexer     

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.     

10 Gb/s wavelength conversion with integrated multiquantum-well-based 3-port Mach-Zehnder interferometer

All-optical wavelength conversion of 10 Gb/s data with simultaneous regeneration of the extinction ratio is achieved by means of a monolithic 3-port Mach-Zehnder interferometer. The reported devices are based on an all active multiquantum-well waveguide structure with optical amplifiers in the input/output gates. Wavelength conversion is realized by optical cross-phase modulation in a counter propagative operation mode without applying an optical filter. The 3-port Mach-Zehnder interferometer can provide either inversion or noninversion of wavelength converted 10 Gb/s data.     

Observation of phase conservation in a pulse sequence at 10 Gb/s ina semiconductor optical amplifier wavelength converter by four-wavemixing

Phase conservation in a pulse sequence at 10 Gb/s in wavelength conversion by four-wave mixing in a semiconductor optical amplifier is experimentally demonstrated. Conversion of 10-Gb/s signals with a bit-error rate of <10^-9 is demonstrated for wavelength downshifts of 12.5 nm     

All-optical wavelength conversion in optical multicarrier networks

The authors analyze the use of all optical wavelength conversion in the optical layer of a high-capacity transport network and compare different technological solutions. The analysis is based on the evaluation of the transmission performance of a generic signal path through the network. At least two technologies have been discovered allowing the realization of all-optical wavelength converters suitable for use in the considered application, providing high performance. In particular, for networks covering long distances, wavelength conversion based on four-wave-mixing in semiconductor amplifiers seems to be a very interesting solution     

Polarisation-independent wavelength conversion using nonlinearoptical loop mirror

A polarisation-independent all-optical wavelength conversion technique is proposed that uses a nonlinear optical loop mirror (NOLM). When the polarisation state of the input signal light is varied, wavelength-converted signals exhibit a converted power fluctuation of only 0.6 dB, and the receiver sensitivity does not change