1,720,981 research outputs found
NRZ/RZ 40 Gbit/s optical regenerator based on a photonic two-level nonlinear device
No full textA compact device with a two-level transfer function (TF) implemented with two semiconductor optical amplifier (SOA)-based stages is proposed and characterized. Each stage exploits nonlinear polarization rotation and self-phase modulation. The obtained improved TF with very flat top and bottom levels makes the scheme suitable for working as a reshaper in all-optical regeneration. The effectiveness of the device is verified in regenerating both nonreturn-to-zero (NRZ) and return-to-zero (RZ) data signals up to 40 Gb/s. Bit error rate measurements demonstrate increased threshold margin and extinction ratio improvement
Spectral-Efficient Flexible Optical Multicasting in a Periodically Poled Lithium Niobate Waveguide
No full textHitless reconfiguration of a PPLN-based multiwavelength source for elastic optical networks
No full textElastic optical networks may significantly take advantage of reconfigurable multiwavelength sources in order to maximize spectral efficiency and throughput. A multiwavelength source based on the line multiplication process taking place in a periodically poled lithium niobate waveguide has been recently proposed as a generator of tunable frequency combs. This source is stable and compact with respect to fiber-based solutions and does not require high radio frequency power. A transmitter employing the multiwavelength source is implemented and characterized in the static and dynamic regime, thus demonstrating hitless reconfiguration. The source also is tested within a three-node testbed employing commercial transceiver cards
Colorless all-optical sum and subtraction of phases for phase-shift keying signals based on a periodically poled lithium niobate waveguide
No full text
Review on phase preserving amplitude regeneration for phase-coded signals exploiting FWM in a saturated SOA
No full textAll-optical phase-preserving amplitude regeneration is an effective method to reduce nonlinear phase noise in long-haul transmission of phase-modulated signals. Here we review the latest results on a proposed differential phase shift keying (DPSK) regeneration scheme exploiting a compact architecture based on a saturated semiconductor optical amplifier. The scheme allows for amplitude-only signal regeneration with limited excess phase-noise contribution. Both the pass-through (PT) and the four wave mixing (FWM) signals exhibit enhanced Q-factor and margin improvement in bit error rate vs receiver threshold measurements, making the configuration suitable for both wavelength-preserving optical regeneration and wavelength regenerative conversion. The regeneration through FWM has an higher resilience to noise than the PT and its polarization dependency can be eliminated with the implementation of a dual co-polarized pump scheme. Preliminary experiments of simultaneous regeneration of two DPSK data streams are also provided
- …
