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A spatial pulse position modulation is proposed and experimentally validated for a 12 spatial channel transmission over 53km multi-mode fiber. Improved data rates up to 30% are demonstrated with respect to conventional QPSK.
We demonstrate the potential of single-carrier serial line-rate 400Gb/s PM-64QAM transmission over short reach optical links. Performance below pre-FEC BER threshold is achieved over 328km for 96×516Gb/s PM-64QAM, employing EDFA-Raman amplification and LA-PSCF.
Novel digital subcarrier multiplexed (SCM) hybrid QAM scheme is proposed, demonstrating flexibility in data-rate and tolerance to optical filtering effects. SCM hybrid 150Gb/s signals show ∼60% reach improvement in cascaded 37.5GHz ROADM filtering scenario.
We demonstrate transmission of trellis-coded-modulated-12-spatial-and-polarization modes over 40km 6-LP-mode fiber with low differential mode group delay. By employing 8-PSK trellis coded modulation, an OSNR gain of 1.8dB is observed in comparison to QPSK.
We demonstrate an all-fiber multi-mode, multi-core photonic lantern mode multiplexer for SDM applications. Selective excitation of 21 spatial channels, LP01 and LP11a, b modes in 7 cores, with insertion losses below 0.4dB is obtained.
10 spatial mode transmission over 40km multi-mode fiber (50μm core diameter) with low DMGD is demonstrated using low-loss all-fiber 10-port photonic lanterns and 20×20 multiple-input multiple-output time-domain equalizer. A maximum MDL of 4.5dB is observed.
Experimental demonstration of an 8-state (Turbo-) Trellis-coded modulation achieving a data throughput of 2 bits/symbol is demonstrated. TTCM outperforms Quadrature Phase Shift Keying with an OSNR gain of 3.8 dB after 1000 km at HD-FEC.
Wavelength and mode-division multiplexed 4.45 km low-DMGD (0.05ns/km) 6-LP mode fibre transmission employing low-loss all-fibre 10-port photonic lanterns is demonstrated using a 20×20 multiple input multiple-output time-domain equalizer. We measured an MDL of 8.7± 1.7dB over 10 hours.
We optimize the FEC-OH of dual-carrier PM-16QAM 400Gb/s super-channel, considering the tradeoff between FEC net coding gain and performance penalties due to limited DAC/ADC bandwidth. At optimum FEC-OH (−29%), WDM transmission of 400Gb/s super-channel over 2150km LAPSCF is experimentally demonstrated.
We experimentally evaluate filtering penalties due to channel add/drop in optical nodes for 32GBd PM-8QAM and PM-16QAM signals, transmitted over 37.5GHz WDM grid. Optical spectral shaping is employed in each node to mitigate optical filtering penalties.
We experimentally demonstrate long-haul WDM transmission of 36GBaud four-subcarrier Terabit PM-16QAM super-channel. Digital pre-distortion enables ∼50% reach improvement for both LAPSCF and SSMF fiber-types, with maximum recorded reach of 2272km and 949km, respectively.
24.3GBaud 32QAM WDM transmission over a novel 1km hole-assisted few-mode multi-core fiber is demonstrated, resulting in 5.1Tbit/s spatial supercarriers (4Tbit/s net) with a gross spectral efficiency of 102bits/s/Hz, and a gross aggregate transmission rate of 255 Tbit/s (200 Tbit/s net).
Integrated mode (de-)multiplexers can offer compact and stable solutions for MDM systems. SOI-based circuits are introduced and have been tested in system experiments. Scalability to higher numbers of modes is discussed.
A photonic integrated mode coupler based on silicon-on-insulator is employed for mode division multiplexing (MDM) over a 193 m 19-cell hollow-core photonic bandgap fibre (HC-PBGF) with a -3 dB bandwidth >120 nm. Robust MDM transmissions using LP01 and LP11 modes, and two degenerate LP11 modes (LP11a and LP11b) are both experimentally verified.
The multiple-input multiple-output (MIMO) weight matrix is separated into row vectors to adaptively control the step size per output. Using an experimental 3-moded dual polarization coherent transmission setup, we show that the convergence time can be reduced by 50%.
Bi-directional transmission of ultra-wideband wireless signals over 1 mm core diameter POF for PON-based in-home network is demonstrated. Standard compliant signal distribution over 50 m POF and 4 m wireless transmission is demonstrated.
We report for the first time coherently-detected, polarization-multiplexed transmission over photonic band gap fiber. By transmitting 96 × 320-Gb/s DP-32QAM modulated channels, a net data rate of 24 Tb/s was obtained.
A novel parallel optical delay detector for angle-of-arrival measurement is proposed and the measurement errors are experimentally studied and analyzed. Moreover, the measurement accuracy monitoring is investigated.
To reduce DSP complexity, both a master/slave and phase-averaged single digital PLL are investigated for a 3×112Gbit/s DP-QPSK transmission over 70km FMF with inline MM-EDFA. A 0.5dB OSNR gain at 3.8×10-3 FEC-limit is experimentally demonstrated.
2.576Tb/s (23×2×56Gb/s) mode division multiplexed transmission over 11.8km differential mode delay uncompensated few-mode fiber is experimentally demonstrated using direct-detection and 28GBaud 4-level pulse amplitude modulation (4PAM). Assuming 27.5% (training sequence, framing, and error correcting) overhead, the net bit-rate is 1.87Tb/s.
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