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We demonstrate, using a compact InP-based integrated assembly of a tunable laser and a double-nested Mach-Zehnder modulator, generation of Nyquist-prefiltered QPSK and 16-QAM signals at 32-Gbaud. We transmitted them over 8000-km and 960-km SSMF, respectively.
We experimentally demonstrate the best known 16-ary 4-d modulation format at 24.8 Gb/s using coherent optical OFDM, achieving 0.58 dB OSNR gain over PDM-QPSK at a SER of 10-2. With 7% overhead optimal codes, a 0.38 dB gain is theoretically achievable.
We review recent progress on advanced modulation formats for backbone optical networks. A simple closed-form expression is derived to approximately compare PDM n-QAM formats based on their achievable spectral-efficiency-distance products for dispersion uncompensated homogeneous transmission.
We propose a computationally efficient and frequency-offset-tolerant channel estimation and synchronization method for polarization-division-multiplexed (PDM) coherent optical OFDM (CO-OFDM). Using this method, we demonstrate a 43-Gb/s PDM CO-OFDM transmission with 16-QAM subcarrier modulation over 5,200-km of ultra-large-area fiber.
Multi-carrier superchannels based on coherent optical orthogonal frequency division multiplexing (CO-OFDM) supporting 400-Gb/s and 1-Tb/s data rates at high spectral efficiencies are reviewed. The generation and detection of such superchannels and their transmission and routing performances are elaborated.
We discuss the impact of fiber nonlinearity on a recently-demonstrated 1.2-Tb/s polarization-division-multiplexed (PDM) coherent optical OFDM superchannel in long-haul transmission over 7200 km of ultra-large-area fiber. The improvement obtained by nonlinearity compensation is also discussed.
We review recent advances in the generation, detection, and transmission of high-speed optical multi-carrier signals, with particular emphasis on the use of optical orthogonal frequency-division multiplexing (OFDM) based multi-carrier modulation for high-spectral-efficiency optical transmission towards 1-Tb/s per-channel data rate.
We describe a multi-carrier coherent-receiver scheme where the coherent beating between an ultra-high-speed multi-carrier signal and multiple optical local oscillators (OLOs) is conducted in a single optical hybrid, followed by carrier separation through an arrayed waveguide grating (AWG) array. Sharing the optical hybrid for multiple OLOs simplifies the coherent receiver complexity and eases the...
We demonstrate the generation and detection of a novel reduced-guard-interval CO-OFDM signal at 448 Gb/s, occupying 60-GHz optical bandwidth. We transmit this signal over 2000 km of ULAF with five 80-GHz-grid WSS-based ROADM passes.
We experimentally demonstrate the intra-symbol frequency-domain averaging based channel estimation for a 40-Gb/s polarization-division-multiplexed coherent optical OFDM signal with 8-QAM modulation under large polarization-mode-dispersion, showing improved efficiency as compared to the time-domain averaging based scheme.
We demonstrate a fast-speed PMDC for 40 Gb/s DBPSK and DQPSK. The PMDC increases tolerable average PMD of the DBPSK and DQPSK system to 9 ps and 18 ps, respectively.
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