1,721,020 research outputs found
Towards precise one-way fiber-based frequency dissemination using phase-sensitive amplification
No full textIn this Letter, we conceptually demonstrate the potential of a phase-sensitive amplifier to operate as an active detector of stochastic phase changes in fiber-based frequency dissemination systems with two orders of magnitude better sensitivity than state-of-the-art one-way systems relying on two-wavelength dissemination schemes. Theoretical and experimental analyses show that these stochastic phase changes (caused by environmental changes, e.g., due to temperature) can be detected with high sensitivity via optical phase comparison performed within the phase-sensitive amplifier. Experimental results are in close agreement with theoretical predictions showing that phase-sensitive amplifiers may find a niche application in metrology, with potential to significantly improve one-way fiber-based frequency dissemination systems.</p
Towards one-way fibre-based frequency dissemination enabled by phase sensitive amplification receivers
No full textWe demonstrate the potential of a phase sensitive amplifier to operate as an active detector of stochastic phase changes in fibre-based dissemination systems with an order of magnitude better sensitivity than state of the art one-way systems.</p
Phase regeneration of optical signals
No full textWe present recent advances in phase-sensitive amplification technology and its application to the regeneration of phase-encoded signals. Using a combination of parametric effects in fibers and optical injection locking of lasers, it is possible to observe phase regeneration in signals with multiple levels of phase encoding
Photonic reservoir computing based on optical filters in a loop as a high performance and low-power consumption equalizer for 100 Gbaud direct detection systems
No full textWe propose and numerically simulate a passive neuromorphic processor performing equalization in C-band IM-DD links, that employs a spatial reservoir computing scheme based on recurrent optical filters. Followed by a feed forward equalizer, the system achieves sub HD-FEC performance up to 60km in 224 Gbps/λ
Ultrafast all-optical matrix-vector multiplication based on four-wave mixing
No full textWe propose a nonlinear optical approach for ultra-fast, matrix-vector multiplications as required in machine-learning tasks. Optical multiplication is experimentally demonstrated, with less than 0.05% classification accuracy reduction compared to digital results on the MNIST dataset
Multilevel quantization of optical phase in a novel coherent parametric mixer architecture
No full textThe exponentially increasing capacity demand in information systems will be met by carefully exploiting the complementary strengths of electronics and optics. Optical signal processing provides simple but powerful pipeline functions that offer high speed, low power, low latency and a route to densely parallel execution. A number of functions such as modulation and sampling, complex filtering and Fourier transformation have already been demonstrated. However, the key functionality of all-optical quantization has still not been addressed effectively. Here, we report an all-optical signal processing architecture that enables, for the first time, multilevel all-optical quantization of phase-encoded optical signals. A four-wave mixing process is used to generate a comb of phase harmonics of the input signal, and a two-pump parametric process to coherently combine a selected harmonic with the input signal, realizing phase quantization. We experimentally demonstrate operation up to six levels
QPSK phase and amplitude regeneration at 56 Gbaud in a novel idler-free non-degenerate phase sensitive amplifier
No full textWe introduce a novel input-idler-free non-degenerate phase sensitive amplifier (PSA) configuration and use it for simultaneous phase and amplitude regeneration of quadrature phase shift keyed (QPSK) signals demonstrated at symbol rates up to 56 Gbaud
Towards nonlinear conversion from mid- to near-infrared wavelengths using Silicon Germanium waveguides
Full text linkWe demonstrate the design, fabrication and characterization of a highly nonlinear graded-index SiGe waveguide for the conversion of mid-infrared signals to the near-infrared. Using phase-matched four-wave mixing, we report the conversion of a signal at 2.65 µm to 1.77 µm using a pump at 2.12 µm
Optical properties of silicon germanium waveguides at telecommunication wavelengths
No full textWe present a systematic experimental study of the linear and nonlinear optical properties of silicon-germanium (SiGe) waveguides, conducted on samples of varying cross-sectional dimensions and Ge concentrations. The evolution of the various optical properties for waveguide widths in the range 0.3 to 2 µm and Ge concentrations varying between 10 and 30% is considered. Finally, we comment on the comparative performance of the waveguides, when they are considered for nonlinear applications at telecommunications wavelengths
Research Data for Polarization Insensitive Wavelength Conversion in a Dispersion-Engineered SiGe Waveguide
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