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Laboratory optical atomic clocks based on quantum-logic spectroscopy of the 1S0 ↔ 3P0 transition in 27Al+ have reached a systematic uncertainty of 8.6×1018 [1], enabling table-top tests of fundamental physics [2] as well as measurements of gravitational potential differences [3]. New applications in geodesy and hydrology will require that such clocks be ruggedized and packaged so that they can be...
An optical coupler composed of gold cylinder arrays overlaid with a gold film was proposed for quantum well infrared photo-detector. Finite difference time-domain method was used to numerically investigate the near-field enhancement. The result showed that for the x-polarized light normally incident from the backside, strong electric field component perpendicular to the quantum well can be generated,...
We investigate the impact of rotational symmetry of the metamaterial perfect absorber on its performance. The calculated results show that a absorption peak appears at the same wavelength in the absorption spectrum no matter the polarization of the incident light parallels to x axis or y axis when the absorber possesses four-fold rotational symmetry. However, in the case of two-fold rotational symmetry,...
A Stokes vector based non-data-aided DGD monitoring scheme for 40-Gb/s polarization-multiplexed coherent optical OFDM systems with low-bandwidth sampling is reported. The DGD estimation error is less than 2.5 ps after 1000-km long-haul transmissions.
We report a two-stage frequency domain equalization method for non-data-aided coherent polarizationmultiplexed 16-QAM system. Robust performance against polarization-mode-dispersion and long-haul transmission is experimentally demonstrated using cascaded blind CD compensation and dual-mode adaptive equalization.
We propose a technique for polarization-mode-dispersion (PMD) estimation in 16-QAM coherent polarization-multiplexed single-carrier system using complementary Golay training sequences and channel response filter analysis. The technique is experimentally proved to be fast and highly accurate.
We present a novel moments-based method for optical signal-to-noise ratio (OSNR) monitoring in polarization-multiplexed coherent optical systems. The method is experimentally demonstrated to show high accuracy in OSNR monitoring over a large range for both constant and non-constant modulus modulation formats.
We experimentally demonstrate full-transmission chromatic dispersion estimation with high accuracy in 40-Gb/s coherent polarization-multiplexed single-carrier system using binary complementary Golay training sequences. The technique is verified to be robust against polarization-mode-dispersion and amplified-spontaneous-emission noise.
We demonstrate real-time reception of a 110-Gb/s multi-band OFDM signal after transmission of 600-km SSMF fiber and 400-ps differential-group-delay. The performance of 110-Gb/s CO-OFDM signal is characterized by measuring the individual sub-band at 3.33 Gb/s.
Vertically self-aligned gallium nitride nanorod arrays grown by plasma-assisted molecular-beam epitaxy are shown to behave as subwavelength optical media in both their discrete and integrated forms, which have important implications for optoelectronic applications.
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