1,721,266 research outputs found
Photonic sampler for 1550 nm signals
No full textA device that extracts a sample of configurable length from a 1550-nm communication signal under the command of a pulsed light beam is presented. The device is realized by means of two CdTe:In optical switches; it has 10-ns rise and fall times and a sampling window of the duration of a microsecond. The photonic sampler is fully transparent to the optical communication signals in the third window
Crosstalk-Induced Penalty in Coherent Space-Division Multiplexing Transmission
No full textThe impairment due to the in-band crosstalk on space-division multiplexing (SDM) coherent transmission is evaluated in terms of increase of the error-vector magnitude (EVM). An analytical model allowing the calculation of the reaches for optically-amplified SDM medium-long distance coherent systems, taking also into account the Kerr nonlinear effect in optical fiber, is presented
Volume holographic optical correlation for digital word recognition
No full textOptical byte recognition using volume holographic correlator is presented. The storage of 256 multiplexed holograms is performed and the phase-coded byte discrimination in real-time is experimented
Trasporto di modulazione passivo, diretto e non-coerente fra segnali a diversa lunghezza d’onda
No full textCompensatore di dispersione cromatica
No full textDistorsore di un segnale elettrico utile al fine di compensare in modo accordabile la dispersione cromatica accumulata in sistemi in fibra ottica. Distorsore comprendente una linea di trasmissione non uniforme, con una pluralita' di elementi di materiale dielettrico, posti sopra detta linea e movimentati da attuatori meccanici
Very high-capacity short-reach VCSEL systems exploiting multicarrier intensity modulation and direct detection
Full text linkMulticarrier intensity modulation of a bandwidth-limited long-wavelength VCSEL is exploited combined to direct detection to achieve very high capacity simple systems for short-reach applications. Tailored FDM subcarriers modulation and allocation allow to match the non-uniform frequency response of the system induced by the direct modulation and detection of the FDM signal and by the uncompensated SSMF propagation, overcoming the VCSEL bandwidth limitations. A whole transported throughput ranging from 34 Gb/s to 25 Gb/s from few hundreds meters to 20 km of SSMF propagation is experimentally demonstrated even by employing a 5-GHz band VCSEL source
A novel interferometric wavelength converter
No full textThe fiber Kerr effect employment in a wavelength conversion version, owing to low silica nonlinearity, has been prevented by the lack of an efficient interferometric architecture. A novel all-fiber wavelength converter is presented and characterized. The proposed scheme while taking advantage of the Kerr effect properties in standard communication optical fiber overcomes classical interferometric structure limitations, such as high environmental sensitivity and difficult operating management. A comparison with these architectures is discussed. Operation up to 3 Gb/s is demonstrated in the whole third communication window
- …
