Optical frequency up-conversion of UWB monocycle pulse based on pulsed-pump fiber optical parametric amplifier

Optical Transmission Systems, Switching, and Subsystems VII, 2009; Asia Communications and Photonics Conference and Exhibition, ACP, 2009We propose a method to realize frequency up-conversion of UWB monocycle pulse using pulsed-pump fiber optical parametric amplifier (OPA). The spectrum of the amplified signal contains many discrete frequency components which are separated by the modulation frequency of the pump. Each frequency components contain the same spectral information as that of the original signal. By selecting the first-order or higher-order frequency components of the amplified signal and beating in the photodetector, up-converted signal at different frequencies are obtained. We demonstrate frequency up-conversion of baseband UWB monocycle pulse from 3-GHz to 19-GHz in the experiment and frequency up-conversion of pseudo-random binary sequence (PRBS) signal from 3-GHz to 60-GHz in the simulation. © 2009 SPIE-OSA-IEEE.published_or_final_versio

Subpicosecond fiber optical parametric chirped pulse amplifier based on highly-nonlinear fiber

We experimentally demonstrate a fiber optical parametric chirped pulse amplifier. A 750-fs signal is stretched to 40 ps, amplified with a gain of 30 dB through parametric process and then compressed to 808 fs. 2010 Optical Society of America. © 2010 IEEE.published_or_final_versionThe 2010 Conference on Lasers and Electro-Optics (CLEO) and Quantum Electronics and Laser Science Conference (QELS), San Josa, CA., 16-21 May 2010. In Proceedings of the CLEO/QELS, 2010, p. 1-

Fast and wide tuning wavelength-swept source based on dispersion-tuned fiber optical parametric oscillator

We demonstrate a dispersion-tuned fiber optical parametric oscillator (FOPO)-based swept source with a sweep rate of 40 kHz and a wavelength tuning range of 109 nm around 1550 nm, The cumulative speed exceeds 4,000,000 nm/s. The FOPO is pumped by a sinusoidally modulated pump, which is driven by a clock sweeping linearly from 1 to 1.0006 GHz. A spool of dispersion-compensating fiber is added inside the cavity to perform dispersion tuning. The instantaneous linewidth is 0.8 nm without the use of any wavelength selective element inside the cavity. 1 GHz pulses with pulse width of 150 ps are generated. © 2010 Optical Society of America.published_or_final_versio

Fast and wide wavelength-swept fiber optical parametric oscillator based on dispersion-tuning

JTuA - Joint FiO/LS Poster Session I: paper JTuA30We demonstrate a fast and wide tuning wavelength-swept source based on a dispersion-tuned fiber optical parametric oscillator. We achieved the sweep rate of 40 kHz and the wavelength tuning range of 109 nm.postprintFrontiers in Optics 2010 / Laser Science XXVI (FiO/LS 2010), Rochester, N.Y., 24 October 2010. In Optics InfoBase, 201

Millimeter-wave UWB signal generation via frequency Up-conversion using fiber optical parametric amplifier

We propose and demonstrate a novel approach to generate millimeter-wave (MMW) ultra-wideband (UWB) signal via frequency up-conversion using fiber optical parametric amplifier (OPA). The baseband UWB signal is amplified by a high-repetition-rate pulsed pump and generates many sidebands separated by the modulation frequency of the pump. By selecting two or three of the sidebands and beating in the photodetector, we can obtain an up-converted signal in the MMW band. In our experiment, we have successfully demonstrated UWB signal up-conversion from 3 to ∼19 GHz with 18-dB optical gain using fiber OPA. © 2009 IEEE.published_or_final_versio

Using illumination estimated from silhouettes to carve surface details on visual hull

This paper deals with the problems of scene illumination estimation and shape recovery from an image sequence of a smooth textureless object. A novel method that exploits the surface points estimated from the silhouettes for recovering the scene illumination is introduced. Those surface points are acquired by a dual space approach and filtered according to their rank errors. Selected surface points allow a direct closed-form solution of illumination. In the mesh evolution step, an algorithm for optimizing the visual hull mesh is developed. It evolves the mesh by iteratively estimating both the surface normal and depth that maximize the photometric consistency across the sequence. Compared with previous work which optimizes the mesh by estimating the surface normal only, the proposed method shows better convergence and can recover better surface details, especially when concavities are deep and sharp.postprintThe British Machine Vision Conference (BMVC) 2008, Leeds, U.K., 1-4 September 2008. In Proceedings of the British Machine Vision Conference, 2008, v. 2, p. 895-90

Control of optical rogue waves in supercontinuum generation with a minute continuous wave

We numerically demonstrate that optical rogue wave in supercontinuum generated with picosecond pulse can be controlled by a minute continuous wave. © 2011 OSA.published_or_final_versio

Observing the spectral dynamics of a mode-locked laser with ultrafast parametric spectro-temporal analyzer

We experimentally observe the spectral dynamics of a passively mode-locked fiber laser by using a parametric spectro-temporal analyzer (PASTA) with a frame rate up to 100 MHz, and different non-repeating transient dynamics has been observed. ©2014 Optical Society of Americapostprin

Optically powered RZ-DPSK Signal Transmission System with distributed parametric amplification

Distributed parametric amplification (DPA) system for RZ-DPSK signal has been demonstrated. The residual pump was recycled to power up the receiver. Less than 1-dB power penalties at 10 -9 BER are introduced with 10-dB parametric gain. © 2011 National Sun Yat-Sen Univ.published_or_final_versio

High-sensitivity optical preamplifier for WDM systems using an optical parametric amplifier

We propose and demonstrate a novel preamplifier to improve receiver sensitivity for a 10-Gb/s return-to-zero on-off keying format by using a fiber optical parametric amplifier. Receiver sensitivity can reach down to -42 dBm at bit-error rate = 10-9 This sensitivity is only 1.1 dB off the quantum limit. The crosstalk issue is also investigated for this dual-end detection scheme in a wavelength-division-multiplexing system. © 2009 IEEE.published_or_final_versio