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We transmitted probabilistically shaped 64-QAM at 7.46 b/s/Hz over a 5,523-km inservice EDFA-only amplified trans-Atlantic cable (5.68 b/s/Hz over a looped-back 11,046 km). Using real-time processing we achieve single-carrier 250-Gb/s 16-QAM at 4 b/s/Hz.
We demonstrate a 218-Gb/s direct detection receiver using Kramers-Kronig optical phase reconstruction and chromatic dispersion compensation based on a single photodiode and achieve single-span transmission over 125 km of standard singlemode fiber at 1550 nm.
We demonstrate an all-electronic digital-to-analog converter (DAC) with 100-GHz electrical bandwidth sampling at 240 GS/s, based on digital bandwidth interleaving. We test the DAC by generating up to 190-GBaud Nyquist shaped pulse amplitude modulated (PAM).
We demonstrate an all-electronically multiplexed, single optical carrier, flexible rate transmitter based on a high-speed 3-bit multiplexer and analog-to-digital converter integrated circuit. Line rates up to 1.08 Tb/s are obtained using 90 Gbd PDM-64QAM.
We demonstrate the first all-electronically time division multiplexed (ETDM) transponder with a line rate exceeding 1 Tb/s (90-GBd PDM-64-QAM), using a novel 3-bit multiplexing DAC IC.
We demonstrate a coherent receiver using a 100-GHz electrical bandwidth and 240-GS/s real-time oscilloscope as analog-to-digital converter in a 160-Gbaud QPSK system.
We review high-speed experimental coherent transmission systems for bit rates from 400 Gb/s to 1.2 Tb/s, using high-speed electronic multiplexing to symbol rates from 72 GBd to 107 GBd.
We present experimental transmission results for a novel 6-core coupled-core fibre with 125 μm cladding diameter. We transmit combined 2-polarization, 6-SDM and 30-WDM channels over a distance of 1705 km, with a spectral-efficiency-distance product of 30690 bit/s/Hz km.
We present experimental results for mode-multiplexed WDM transmission over OM3 multimode fibres. We transmit 60 WDM channels and 3 spatial modes over a distance of 305 km. We use mode-selective photonic lanterns as mode couplers and for differential group delay compensation.
We generate a 72-GBd single-carrier 64-QAM signal using high-speed digital-to-analog converters. We obtain a record line rate of 864 Gb/s on a single wavelength and demonstrate 5-channel WDM transmission over 400 km of fiber.
We review recent experimental demonstrations of high-speed optical transmission systems using digital coherent detection at high, all-electronically multiplexed symbol rates of 80 and 107 GBd to achieve interface rates from 428 Gb/s to 1.28 Tb/s.
We demonstrate the generation of all-electronically multiplexed 107-Gbaud PDM-16QAM and its coherent detection using 72-GHz balanced photodetectors and a 63-GHz real-time oscilloscope.
We transmit all-electronically multiplexed 107-Gbaud polarization-multiplexed quadrature-phase-shift-keying over 4,800-km using coherent detection based on a real-time oscilloscope with 63-GHz electronic bandwidth. Ten WDM channels on a 120-GHz grid yield a spectral efficiency of 3.3 b/s/Hz.
We demonstrate a 1-Tb/s dual-carrier PDM-16QAM interface (all-electronic 80-GBaud per subcarrier). We transmit five dual-carrier channels over 3200 km at 5.2-b/sHz spectral efficiency, implementing coherent detection, off-line digital signal processing, and soft-decision forward error correction.
We demonstrate an all-electronically multiplexed, single-polarization 107-Gbaud quadrature-phase-shift-keyed (QPSK) transmitter and coherent detection using a real-time oscilloscope prototype with 63-GHz electronic bandwidth, sampled at 160 GS/s. Using DFB lasers, we obtain back-to-back implementation penalty of 3 dB and 2400-km transmission.
WDM transmission over 5600 km of ultra-large-area fiber is achieved using an 80-Gbaud all-electronically multiplexed polarization-division multiplexed quadrature phase-shift-keyed (PDM-QPSK) transmitter and off-line intradyne detection with four synchronized 120-GSamples/s, 45-GHz inputs of an oscilloscope prototype.
We transmit a mix of 224-Gb/s and 112-Gb/s PDM-QPSK channels at a 50-GHz spacing and 3-b/s/Hz spectral efficiency over 1200-km dispersion-managed LEAF® spans with 3 ROADMs and over 2000 km without ROADMs.
We show that time-interleaved RZ-PDM-QPSK and forward Raman pumping can increase the performance of a 112-Gb/s PDM-QPSK coherent unrepeatered transmission system over 300 km of NZDSF by more than 2 dB.
We show that 112-Gb/s PDM-QPSK coherent transmission systems with RZ pulse shape have better tolerance to ROADM filtering than NRZ, and time-interleaved RZ-PDM-QPSK outperform NRZ-PDM-QPSK in nonlinear transmission even with tight filtering.
A single-polarization 160-Gb/s (80-Gbaud) electronically multiplexed (ETDM) single-carrier quadrature phase-shift-keyed (QPSK) signal is transmitted over 2400 km of ultra-large-area fiber. Coherent detection is achieved using two 120-GSamples/s, 45-GHz bandwidth oscilloscope prototypes and off-line digital signal processing.
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