Channel cloning by multi-mode phase-sensitive parametric mixer.

We investigate high fidelity channel replication approaching the idealized notion of channel cloning with negligible excess noise and distortion. Previously proposed cloning architectures require that the channel carriers to be externally seeded, limiting their ultimate usefulness, whereas the self-seeded approach limits the channel number and signal-to-noise ratio. Specifically, when a single channel is replicated, the noise figure (NF) remains above the well-known 3-dB limit, and multi-channel replication by a dual-pump driven parametric mixer faces a theoretical NF limit of 6-dB.

All optical wavelength multicaster and regenerator based on four-mode phase-sensitive parametric mixer.

Four-mode phase-sensitive (4MPS) process has been employed in a parametric mixer based wavelength multicaster, enhancing the multicasting conversion efficiency and signal-to-noise ratio. In addition, the 4MPS parametric multicaster is an outstanding candidate for all-optical regeneration, owing to its inherent capabilities to clamp amplitude fluctuations by the saturated parametric effect and to squeeze phase distortions by the phase sensitive process. The investigation in this paper focuses on the 4MPS multicaster operated in the saturation gain regime, including theoretical simulations and experimental demonstrations on amplitude and phase noise regeneration over 20 multicasting signal copies.

Two-fold transmission reach enhancement enabled by transmitter-side digital backpropagation and optical frequency comb-derived information carriers.

We demonstrate a two-fold reach extension of 16 GBaud 16-Quadrature Amplitude Modulation (QAM) wavelength division multiplexed (WDM) system based on erbium doped fiber amplifier (EDFA)-only amplified standard and single mode fiber -based link. The result is enabled by transmitter-side digital backpropagation and frequency referenced carriers drawn from a parametric comb.

APPLIED OPTICS. Overcoming Kerr-induced capacity limit in optical fiber transmission.

Nonlinear optical response of silica imposes a fundamental limit on the information transfer capacity in optical fibers. Communication beyond this limit requires higher signal power and suppression of nonlinear distortions to prevent irreversible information loss. The nonlinear interaction in silica is a deterministic phenomenon that can, in principle, be completely reversed.

Resonant reflection spectroscopy of biomolecular arrays in muscle.

Sarcomeres, the functional units of contraction in striated muscle, are composed of an array of interdigitating protein filaments. Direct interaction between overlapping filaments generates muscular force, which produces animal movement. When filament length is known, sarcomere length successfully predicts potential force, even in whole muscles that contain billions of sarcomere units.