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We demonstrate an optical multiplexing and transmission of QPSK-to-16QAM channels over 100 km using wave mixing for aggregation and noise mitigation. For the input signals with phase noise of ∼50, 35 degree and 300 MHz noise bandwidth, the OSNR penalty of ∼1dB is obtained at BER 10–3 for aggregated 20 Gbaud 16QAM signal compared to the case of having no phase noise in input signals.
We experimentally demonstrate a tunable homodyne receiver on polarization multiplexed QPSK signals. PPLN waveguides inside the polarization diversity loops are used to frequency/phase lock the signals with the LO. Open eye diagrams with BER measurements are shown.
We experimentally demonstrate simultaneous phase noise suppression and automatically locked tunable homodyne reception for 20-Gbaud QPSK signal. The phase noise deviation can be reduced by a factor of ∼3. Open I/Q eyes are obtained after the noise mitigation.
We experimentally demonstrate a tunable homodyne receiver on multiple-wavelength QPSK and 16-QAM channels at 20/30 Gbaud. A single PPLN waveguide is used to frequency/phase lock the signals with their tones. Open eye diagrams with BER measurements are shown.
We demonstrate homodyne detection for multiple channels using nonlinear optical signal processing to automatically lock a single “local” pump laser to these data channels simultaneously and perform experimental demonstration with two 20-Gbaud BPSK channels.
We experimentally demonstrate tunable phase-noise mitigation and automatic frequency/phase locking to a “local” pump laser for a 20–32 Gbaud QPSK homodyne receiver using nonlinear optical signal processing. For the input noisy signal, open eye-diagrams are obtained for in-phase and quadrature components and ∼2 dB OSNR gain is achieved at BER 10−3.
We propose an all-optical regeneration consisting of a phase quantizer based on delay and summation of higher harmonics and an optical amplitude squeezer. We experimentally demonstrate phase noise reduction of 40% and OSNR-gain of 3dB at BER 10−3 for 30-Gbaud QPSK signals.
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 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.
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.
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