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We demonstrate coherent WDM transmission using a quantum-dash mode-locked laser diode with resonant feedback. We report a line rate of 12 Tbit/s (32QAM 60×20 GBd PDM) over 75 km SMF. The spectral efficiency is 7.5 bit/s/Hz.
Y-chromosomal variation of selected single nucleotide polymorphisms (SNPs) and 32 short tandem repeat (STR) loci was evaluated in Sardinia in three open population groups (Northern Sardinia, n=40; Central Sardinia, n=56; Southern Sardinia, n=91) and three isolates (Desulo, n=34; Benetutti, n=45, Carloforte, n=42). The tested Y-STRs consisted of Yfiler® Plus markers and the seven rapidly mutating (RM)...
By comparison to a stable reference laser, the phase noise of a frequency comb from a quantum-dash mode-locked laser can be compensated. The quality of the resulting carriers allows the transmission of data at a rate of 1 Tbit/s in a single polarization over a distance of 75 km using a standard forward error correction.
A feed-forward heterodyne scheme is shown to simultaneously reduce the phase noise of many comb lines from a quantum-dash mode-locked laser diode (QD-MLLD). This enables the first coherent data transmission using QD-MLLD as multi-wavelength source.
An optical frequency comb generated by an InAs/InP quantum dash based passively mode-locked laser is investigated. The comb spans ~1.1THz, with 110 modes spaced by ~10GHz, and shows a long-term stability of 3x10-9 over 1000s.
We report for the first time the passive mode-locking of single section Fabry-Perot (FP) lasers based on InAs quantum dots grown on (113)B InP substrate. Devices under study are a 1 and 2 mm long laser diodes emitting around 1.58 µm. Self-starting pulses with repetition rates around 39 and 23 GHz and pulse widths down to 1.5 ps are observed after propagation through a suitable length of single-mode...
Mode-locking of single-section Fabry-Pérot lasers based on InAs/InP quantum dashes is studied by second-harmonic generation frequency-resolved optical gating (SHG-FROG). The devices take advantage of an optimized epitaxial structure with modal gain of 50 cm−1 showing a broad and flat emission spectrum of width in excess of 14 nm. Self-starting pulses of a width down to 430 fs are observed after intracavity...
Pulse generation from single-section Fabry-Pérot InAs/GaAs edge-emitting quantum dot lasers is reported at 1.3μm. Mode-locking performances of the devices are studied as function of injection current and optical spectrum shape.
Optical Frequency Combs are becoming increasingly important for the development of future photonics systems. In this work we present the detailed characterization of optical frequency combs that can be employed in future supechannel Tbit/s transmission systems.
Phase locked frequency combs spanning > 1.5 THz have been generated using passively mode locked quantum dash based lasers emitting at 1.55 µm. These combs are particularly suited for future OFDM transmission systems.
Results of characterization of digital optical spectrometers-on-chip are reported. We present high resolution (up to 4×10−5) spectrometers fabricated on SiO2:Ge and Si3N4 planar waveguides covering the optical range from 440nm to760nm.
- Seven polymorphic sites in the beta-globin cluster in association with specific thalassemia mutations were analyzed in a sample from Sardinia (Italy). In order to verify previous works carried out on normal samples (betaA/betaA) and family studies on beta-thalassemia homozygotes individuals, the haplotype frequencies in both normal individuals (betaA/betaA) and betadeg39-thalassemia carriers (beta...
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