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An all-optical multilevel amplitude regenerator is optimized based on the transmission response of a nonlinear optical loop mirror (NOLM). Three regenerative regions defined by the power-transfer-function (PTF) slope of less than 1 are obtained, and noise suppression is shown for a PAM4 signal. Using amplitude dithering we were able to experimentally characterize the transfer function slope and confirm...
By an orchestra of multiple enabling techniques at the transmitter and receiver, we experimentally demonstrate a single-channel 102.4-Gb/s transmission up to 240-km standard single-mode fiber (SSMF) at C-band with direct detection. At the transmitter, we realize Nyquist-pulse shaping PAM-4 (NPAM-4) modulation and single-sideband modulation by using a dual-drive Mach-Zehnder modulator. At the receiver,...
We study the artificial neural network (ANN) and feed forward equalizer jointly to mitigate the inter-symbol interference (ISI) and the nonlinear distortions in the optical single-side band and direct-detection (DD) system. The optical SSB signal is generated by a relatively low-cost dual-drive Mach-Zehnder modulator (DDMZM). The two driving signals are a pair of Hilbert signals with Nyquist pulse-shaped...
We propose and demonstrate a Hilbert Superposition (HS) scheme in an optical single side-band (SSB) modulation and direct-detection system. The optical SSB signal is generated by a relatively low-cost dual-drive Mach-Zehnder modulator (DDMZM) biased at the quadrature point. The two driving signals are a pair of Hilbert signals with Nyquist pulse-shaped four-level pulse amplitude modulation (NPAM-4)...
We have recently demonstrated the improved phase noise tolerance in coherent optical OFDM by digital coherent superposition of optical OFDM subcarriers, which are phase-conjugated pairs with Hermitan symmetry. In this approach, we realized DCS of OFDM subcarriers in single polarization (or channel), denoted as SP-DCS-OFDM. In this paper, we show that another approach is in dual polarizations, or DP-DCS-OFDM...
We experimentally demonstrate that the digital coherent superposition of optical OFDM subcarrier pairs with Hermitian symmetry can mitigate phase noise, including laser phase noise and self-phase modulation in a nonlinear optical fiber transmission.
We theoretically study third harmonic and triple photon generation (THG/TPG) in photonic crystal fiber (PCF). 9% THG conversion efficiency and 28 triplets/s generation rate are achievable in the proposed PCF.
We propose a polarization demultiplexing method in Stokes space for coherent optical PDM-OFDM without inserting training symbols. The experimental demonstration of fiber transmissions shows good performance, comparable with that of using training symbols.
A tunable polarization diversity silicon waveguide based optical filter with fiber assembly was demonstrated. With the polarization diversity scheme, polarization dependent loss (PDL) being less than 0.5 dB was achieved in the silicon optical filter. The insertion loss of the packaged polarization diversity module is ∼13.4 dB. The extinction ratio of the optical filter is about 20 dB, and the tuning...
A semi-finished single mode multimode single mode fiber structure with an air gap is investigated and its displacement sensing characters are proposed. The distance between the MMF and the SMF used as a "receiver" can be detected by tracing the associated minimum position of waveform in spectrum. Good linearity is shown in the relationship between displacement and wavelength.
The timing and optical laser phase of individual bands in multi-band OFDM are correlated. We significantly reduce the OFDM overhead through using FFT window synchronization for channel estimation and sharing pilot subcarriers for phase estimation.
The channel estimation result of non-pilot subcarriers mainly depends on adjacent pilot subcarriers. A linear interpolation algorithm has been applied to the channel estimation of non-pilot subcarriers. The performance of interpolation algorithm has been simulated in a 10Gb/s direct-detection optical orthgonal frequency division multiplexing(DDO-OFDM) communication system. Constellation convergence...
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