Antonella Bogoni

Polarization and wavelength-independent time-division demultiplexing based on copolarized-pumps FWM in an SOA

A novel optical time-division demultiplexer based on copolarized-pumps four-wave mixing in semiconductor optical amplifiers is presented. The scheme is polarization and wavelength independent. Effective 10-Gb/s channel extraction from an optical time-division multiplexed 40-Gb/s aggregate frame is experimentally demonstrated.

Simultaneous Dual-Wavelength Conversion With Multiresonant Saturable Absorption Vertical-Cavity Semiconductor Gate

We experimentally demonstrate the use of a multiresonant, all-optical vertical-cavity semiconductor gate for simultaneously converting the wavelength of an optical data signal into two signals with different wavelengths. The operation of the gate is based on saturable absorption effect in multiple quantum-well structures. The repetition rate of the converted signal is limited by the recovery time of the saturable absorber. The device is compact, passive, polarization-independent, and enables wavelength conversion with a high extinction ratio of more than 10 dB and maximum optical signal-to-noise ratio penalty lower than 3 dB.

Sub-ps resolution sampler based on FWM effect in Highly Non Linear Fibre

A sub-ps optical sampler based on Four Wave Mixing (FWM) in 250 meter-long Highly Non-Linear Fibre (HNLF), has been implemented. Its accuracy resolving ps soliton pulses has been estimated exploiting a commercial oscilloscope and a commercial autocorrelator.

Experimental validation of an extended ABCD model for actively mode-locked fiber lasers

An extended ABCD model for actively mode-locked fiber lasers is presented. This new scheme includes the amplifier model taking into account the power evolution along the cavity fiber. The first experimental validation is reported.

Effective Sample Parallelization in a Single Nonlinear Device for High Sampling Rate Photonic Assisted ADC

An effective parallelization scheme in a single nonlinear device for high-sampling-rate photonic-assisted ADC is presented. 10-fold parallelization of 9.95GS/s signal is experimentally demonstrated with capability for 6-bits ENOB. Potentials for larger parallelization is also discussed.

All-Optical Low-Power 2

An all-optical 2 × 2 cross/bar switch is demonstrated exploiting nonlinear polarization rotation in a single semiconductor optical amplifier. The proposed architecture allows operation with packets at the same input wavelengths and does not require high-speed clock control pump signals. Bit-error-rate measurements at the switch output ports for both cross/bar configurations and for both cases of one and two packet signals connected to the input ports are performed. A maximum of 2.3 dB of power penalty was observed in the worst case. The switching energy was as low as about 400 fJ per bit at 10 Gb/s.

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All-optical flip-flops are key components of photonic digital processing in next generation optical network and computing. In most digital applications, signal synchronization with a reference clock is a basic feature. In this paper, an entire set of all-optical clocked flip-flops, including SR, D, T, and JK types is proposed and demonstrated, each employing a single SR latch and optical logic gates previously introduced in literature. The bi-stable element is based on gain quenching mechanism between SOAs of two coupled fiber ring lasers. Three logic gates are carried out by exploiting four wave mixing (FWM) and cross gain modulation (XGM) nonlinear effects in SOA. Different flip-flop functionalities are obtained by adding one of the logic gates, or a combination of them, to the latch scheme. Performance evaluation in terms of extinction ratio demonstrates the effectiveness of proposed schemes. Speed limitation of flip-flop operation is also investigated and photonic integration is identified as a feasible solution to increase the operation speed beyond GHz.

2 Cross/Bar Switch With a Single Semiconductor Optical Amplifier

All-Optical Re-amplification and Re-shaping (2R) exploiting spectral shift induced by Self-Phase-Modulation (SPM) in a Semiconductor Optical Amplifier (SOA) is presented. Theoretical model taking into account Carrier Density (CD), Carrier Heating (CH) and Spectral Hole Burning (SHB) is experimentally validated using 3 ps optical pulses.

All-Optical Clocked Flip-Flops Exploiting SOA-Based SR Latches and Logic Gates

We report on a simple self-starting diode-pumped passively mode-locked Er-doped fibre laser based on two semiconductor saturable absorber mirrors (SESAMs), generating sub-picosecond stable optical pulses. Pulses duration between 350 and 650 fs (FWHM) was observed for pulses central wavelengths ranging between 1540 nm and 1570 nm. The cavity basic frequency was 3.7 MHz, and stable operation up to the third harmonic (11.1 MHz) was observed when the output power of the 980 nm diode pump was increased to its maximum value of ~300 mW. The maximum average output power was 19.45 mW, which corresponded to a pulse energy of ~4 nJ. Noise characterization of the mode-locked laser source was performed, in order to estimate the phase noise of the output pulses in terms of timing jitter. All the fiber components in the cavity were polarization maintaining in order to increase long-term stability of the laser operation.

2-R Regeneration Exploiting Self-Phase Modulation in a Semiconductor Optical Amplifier

Experimental measurement of in-band Four-Wave-Mixing (FWM) power in non-zero dispersion fiber is presented. A comparison with known methods shows how the proposed procedure is more accurate in frequently interesting cases.