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We have observed the spatially-resolved optical amplification of femtosecond VUV pulses at 126 nm using an OFI Ar2* amplifier. The maximum amplification ratio of 2.57 was observed, which corresponded to the optical gain of 0.94 cm−1.
We present a phase-stable, multi-mJ 3-channel parametric synthesizer generating 2-octave-wide waveforms (0.52–2.4 µm). After two amplification stages, the combined 125-µJ output supports 1.9-fs waveforms. The energy is scaled to 2 mJ after three amplification stages.
We discuss optical two-way time and frequency transfer over air to connect remote optical clocks/oscillators. This method can link remote sites with a residual timing noise of femtoseconds and a residual fractional accuracy below 10−18.
Noise properties of 40 GHz passively mode-locked quantum-dot lasers under optical self-feedback are investigated theoretically and experimentally, showing five different regimes. We identify a regime of resonant feedback yielding a record RF-line-width reduction by 99%.
We propose to insert inverse group velocity dispersion in a conventional time-lens based optical pulse generator to generate pedestal-free optical pulses without optical filtering. A 10-GHz 6.14-ps pedestal-free pulse train is achieved experimentally.
Using modified uni-travelling carrier photodiodes that exhibit high linearity at high photocurrent we have generated a 10 GHz microwave carrier via optical frequency division with sub 500 attosecond absolute timing jitter (1Hz – 10 MHz).
We report a method for performance optimization of optical receivers using avalanche photodiodes operating under dynamic reverse bias, a novel theory developed to improve APD performance.
We describe a rigorous and physically transparent theory of enhancement of third order nonlinear optical processes achieved in plasmonic structures. The results show that while the effective nonlinear index can be enhanced by many orders of magnitude, due to high metal losses the most relevant figure of merit, the amount of phase shift per one absorption length remains very low.
We describe noise limitations associated with Er:fiber-based optical frequency dividers. A low-noise Er:fiber laser combined with optimized photodetection results in 5 GHz signals having phase noise floors of −176 dBc/Hz.
We demonstrate a passive mode-locked erbium-doped fiber ring laser based on a nonlinear silicon microring resonator. By using filter-driven four-wave mixing, a stable mode-locked pulse train at 100 GHz was produced.
The architecture of a 100-Gbit/s hybrid optoelectronic packet switching system and progress in key underlying devices such as optical label processor OEIC, high-speed tunable laser integrated with EAM, and optical clock pulse generator are presented.
Previously, we proposed devices for recognition of BPSK labels with infinite contrast. The recognizable label number was unfortunately limited to the bit number. In this paper, we propose methods to increase the recognizable label number.
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