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We demonstrate compensation of fiber nonlinearities using repeated optical phase conjugation (OPC) in a WDM system with eight 32-Gbaud PDM 16-QAM channels, showing improved performance over a single mid-span OPC and no OPC.
We report on a fully integrated 16-channel polarization diversity fast slot-blocker with 100 GHz channel spacing using silicon photonics. We demonstrated extinction ratio of 20 dB and switching time of 10 ns timescale allowing add-drop operation as high as 320 Gbit/s PDM-32QAM signals.
We demonstrate a novel fully integrated, silicon-on-insulator, 16-channel polarization diversity fast reflective slot-blocker with nanosecond switching time, integrating more than 65 functional elements. Its suitability for use in reconfigurable metropolitan networks is assessed.
We demonstrate a coherent modulator and a receiver based on monolithically-integrated silicon photonic circuits, capable of modulating and detecting 224-Gb/s polarization-division-multiplexed 16-QAM. The high-degree photonic integration promises small-form-factor and low-power transceivers for future coherent systems.
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 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 fiber nonlinearity mitigation using mid-link digital phase conjugation in 40-Gb/s CO-OFDM-16QAM transmission over 100-km ultra-large-area-fiber spans, achieving a reach of 10,400 km, and reach and power-tolerance improvements of 53% and 4 dB, respectively.
We propose digital constructive-superposition to improve the performance of space-division-multiplexed (SDM) signals, and demonstrate a Q2-factor improvement of 2.2 (3.6) dB by constructively-superimposing 2 (3) SDM copies of a 128-Gb/s PDM-QPSK signal after 2688-km transmission over a seven-core-fiber.
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 review high sensitivity modulation formats and in particular, review the principle, implementation, and performance of formats based on the combined use of polarization-division-multiplexed quadrature phase-shift keying (PDM-QPSK, or PQ) and mary pulse-position modulation (m-PPM).
The white frequency noise of a C-band tunable laser is suppressed significantly by optical filtering with a multi-channel ultra-narrowband fiber Bragg grating. This noise suppression is shown to improve the performance of 5-Gbaud PDM-64QAM by 1.7 dB.
A 231.5-Gb/s PDM-OFDM signal with 256-iterative-polar-modulation, outperforming 256-QAM by 1.2 dB in required OSNR after soft-FEC decoding, is generated, FEC-decoded, and transmitted over a record distance of 800 km with 11.15-b/s/Hz intrachannel spectral efficiency.
Recent progress on high-speed optical transmission with per-channel data rates beyond 1 Tb/s using multi-carrier superchannel architectures is reviewed. Various superchannel implementations based on orthogonal frequency-division multiplexing and quasi-Nyquist wavelength-division multiplexing are discussed and compared.
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 novel coherent optical orthogonal frequency-division multiplexing (CO-OFDM) scheme with reduced guard interval (RGI) for high-speed high-spectral-efficiency long-haul optical transmission. In this scheme, fiber chromatic dispersion is compensated for within the receiver rather than being accommodated by the guard interval (GI) as in conventional CO-OFDM, thereby reducing the needed GI,...
We propose a power-efficient modulation/detection scheme that combines PDM-QPSK and 16-ary-pulse-position-modulation. A record sensitivity of 3.5 photons per bit at BER=10-3 is experimentally demonstrated at 2.5 Gb/s with digital coherent-detection, outperforming PDM-QPSK by >;3 dB.
We demonstrate WDM transmission of three 485-Gb/s CO-OFDM channels with 16-QAM subcarrier-modulation, each received by a single coherent detection step. Transmission over 48 100-km ULAF spans and 12 wavelength-selective-switches with 4-b/s/Hz net spectral-efficiency is achieved.
We demonstrate a record receiver sensitivity of 2.7 photons per bit at 6.23-Gb/s net data rate using PDM-QPSK with 4-ary-pulse-position-modulation. This signal is transmitted over a 370-km unrepeatered ultra-large-area-fiber span with 71.7-dB total loss budget.
We demonstrate the generation of a 1.12-Tb/s superchannel with a net intrachannel-spectral-efficiency (ISE) of 8.6 b/s/Hz, and its transmission over a 76.8-km seven-core-fiber using space-division-multiplexing, achieving a record aggregate ISE of 60 b/s/Hz per fiber.
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