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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...
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 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.
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