Stojan Radic

Continuous-Wave Band Translation Between the Near-Infrared and Visible Spectral Ranges

Wavelength conversion based on degenerate four-wave mixing in a photonic crystal fiber with two zero-dispersion wavelengths is investigated both theoretically and experimentally. The proposed concept of universal band translation in a single-pass traveling-wave structure offers a wavelength band rather than a single-wavelength mapping between distant spectral ranges. Near-infrared signals are modulated using both harmonic and pseudorandom bit sequences and translated to the visible optical band. Multiple-channel translation, which produces wavelength-division-multiplexed idlers in the visible band, is demonstrated for the first time. The performance of the translation process is measured both spectrally and temporally for both single- and multiple-channel signals

Impairments in deeply-saturated optical parametric amplifiers for amplitude- and phase-modulated signals

We measure impairment of on-off-keyed and differential-phase-shift-keyed signals imposed by gain saturation in a fiber parametric amplifier. Phase modulation is observed to be more robust, particularly for deep (15 dB) saturation.

1092 Channel 2-D Array Demultiplexer for Ultralarge Data Bandwidth

We demonstrate 1 times 1092 channel wavelength demultiplexing with 50-GHz channel pitch and a 600-nm total bandwidth. Outputs from 1 times 40 channel arrayed waveguide gratings operating with multiple orders enter a free-space optical grating demultiplexer which separates the orders into a 2-D spot array, where the light can be coupled into discrete output fibers or operated on by a surface normal device (i.e., microelectromechanical system switch or detector array). Supercontinuum source input from 1140 to 1750 nm produced a 28 times 39 spot array at the output plane. The insertion loss for light is coupled into a single mode fiber ranged from 7 to 18 dB with less than 10-dB loss in channels between 1300 and 1750 nm. Bit-error-rate measurements show a negligible 0.1-dB power penalty at 10 GB/s

Impact of Pump Phase-Modulation on the Bit-Error Rate in Fiber-Optical Parametric-Amplifier-Based Systems

Pump phase-modulation is often needed to suppress stimulated Brillouin scattering in fiber-optical parametric amplifiers. We show that while this causes a gain variation with a corresponding Q-value penalty, the actual bit-error-rate degradation is not always significant. The findings are supported by experimental studies

Two Pump Parametric Amplifier with 40dB of Equalized Continuous Gain over 50nm

A two-pump fiber parametric amplifier was constructed and measured to have record performance. A continuous-wave 40dB gain was equalized over 50nm, covering the extended L-band spectral domain. The experimental measurements were matched with the theoretical calculations.

Parametric Amplification and Processing in High-Confinement Optical Fibers

Recent advances in parametric amplification and processing in high-confinement fibers are reviewed. Selected demonstrations of advanced signal processing in near-infrared and distant optical bands are described.

Gbps-Rate Channel Translation from Near-Infrared to Visible Band

We demonstrate the translation of Gbps channel from the conventional fiber communication band to the visible band. Signal channel is converted over 1000 nm using four-photon process in photonic crystal fiber. An error-free received performance was measured in the target visible band.

Fiber Parametric Amplifiers: Physics and Applications

A collection of slides from the authors conference presentation is given.

Continuous-Wave Parametric Generation at Visible band in Photonic Crystal Fibers

Parametric generation in the visible range in PCFs is investigated by measuring the frequency shift of the modulation instability (MI) sidebands, using a narrow tunable continuous-wave 780 nm pump.

Emerging Signal Processing Techniques in Optical Communications

We review recent advances in all-optical and electronic processing leading to viable solutions for impairments mitigation in high-speed optical communication systems.