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We propose and demonstrate tunable homodyne detection using nonlinear optical signal processing to automatically lock a “local” pump laser to an incoming 20-to-40-Gbaud QPSK data signal. Open eyes are obtained for both in-phase and quadrature components of the signal after ∼200-km transmission over SMF-28 and DCF fibers. The BER performance of the proposed homodyne detection scheme is also compared...
We experimentally demonstrate the RF photonics filter using optical tapped delay line based on an optical frequency comb and a PPLN waveguide as the multiplexer. RF filters with variable bandwidth, shape and center-frequency are implemented.
We experimentally demonstrate a 2-stage continuously tunable optical tapped-delay-line in which N+M pump lasers produce N×M number of taps. A 3×2-taps optical correlator is implemented to search multiple patterns among 20-Gbuad QPSK signals using nonlinearities and coherent comb source.
We propose and demonstrate an all optical phase noise mitigation scheme by mixing differentially delayed nonlinear products. For 40-Gbits/s signals, phase squeezing results in phase noise range reduction of around 50% and 1.5 dB OSNR gain at BER 10−5.
We experimentally demonstrate tunable optical Nyquist generation of 32Gbaud QPSK signals using optical tapped-delay line. Optical Nyquist spectra for different number of taps are shown, and 20% EVM and 2.8 dB OSNR penalty at BER of 1e-3 are measured.
We experimentally demonstrate the robustness of an MZI-based OSNR monitor under reconfigurable network and transmitter drift. The monitor calibration factors for 25 Gbaud PM-QPSK signal are stored after assembly and applied to study the accuracy of the OSNR monitoring unit when different changing scenarios outside the monitor occurred.
The coherent signal processing of nonlinear wave mixing often creates interferometers that require feedback stabilization. A digital electronic optical phase stabilizer is described that avoids injecting pilot control signals and supports long-duration BER measurements.
We experimentally investigate a polarization-diversity phase-sensitive amplifier (PSA) for phase regeneration of 25-Gbaud DP-BPSK and DP-QPSK signals and show effective reduction on phase noise in both polarizations. BER measurements and reduced phase noise are achieved for both polarizations.
We demonstrate an optical tapped-delay-line that is reconfigurable with complex tapcoefficients and independently and simultaneously performs data pattern recognition, equalization, and QAM format conversion on eight B/QPSK WDM signals at both 20 and 26 Gbaud, demonstrating >400 Gbit/s processing speed.
We propose and demonstrate an all-optical scheme of phase noise reduction using optical nonlinearity and dispersion/conversion delay. This scheme is capable of reducing the standard deviation of phase noise with low frequency component (e.g., laser phase noise) by a factor of ~ 4 without degrading the data signal. The EVM can be reduced from 31% to 11% for ~500 MHz phase noise bandwidth on 20-Gbaud...
We demonstrate an optical-signal-to-noise-ratio (OSNR) monitoring scheme of 200-Gbit/s PM-16QAM and 100-Gbit/s QPSK signals using Mach-Zehnder delay-line-interferometer with <;0.5 dB error for signals with up to 22 dB actual OSNR. We have also shown usability of this scheme by varying different parameters and have determined design guidelines to achieve a desired level of accuracy.
We demonstrate a 2-D optical tapped-delay-line that exploits nonlinearities and chromatic dispersion to perform 2-D correlation on 20Gbaud QPSK data with correlator results with an average EVM of ∼7.8%. We successfully recognize different 2×2 target patterns in an image with 961 pixels.
We demonstrate the generation of optical 16-QAM and 64-QAM at EVM 6.8% and 6.4% respectively using nonlinearities and coherent frequency comb. We also demonstrated a successful transmission through 80-km SMF-28 after compensating with 20-km DCF with negligible penalty.
We report monolithic, tunable 1550-nm HCG-VCSELs with 26.3 nm continuous tuning. Room temperature power of 2.3 mW, 85 °C power of 0.5 mW, and 10 Gb/s direct modulation over 100 km of fiber is demonstrated.
We report monolithic, tunable 1550-nm HCG-VCSELs with 26.3 nm continuous tuning. Room temperature CW power of >3.3 mW, and 10 Gb/s direct modulation over 100 km of fiber is demonstrated.
We demonstrate a data pattern correlator for OOK and BPSK signals that can simultaneously search for multiple patterns using optical sampling via wavelength conversion. We show reconfiguration times as low as 100 ps for the search pattern update in the correlator.
We experimentally demonstrate a tunable and reconfigurable optical tapped delay line using conversion dispersion based delays with optical multicasting and multiplexing. After equalization, at BER of 10-9 and 3 dB power penalty, dispersion tolerance is improved by >;50% and 200% for 80-Gbit/s RZ-DQPSK and 40-Gbit/s RZ-DPSK signals, respectively.
We experimentally demonstrate a tunable and reconfigurable optical DFT to demodulate 10-40-Gbuad OFDM with 2/3/4 subcarriers at 20/40GHz frequency spacing. Average power penalty of ~7 dB at BER of 10-9 is achieved on the subchannels in the 4×20Gbit/s case, and ~3 dB penalty is observed by using 50% guard time 4×10Gbit/s at 20G frequency spacing.
We demonstrate a tunable optical correlator for amplitude and phase modulated signals up to 4-symbol-long patterns using conversion/dispersion based delays. We observed ~1-dB sensitivity penalty (at 10-9 BER) for 2-bit correlation of a BPSK signal. Fine phase control of the taps is shown by wavelength tuning.
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