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We experimentally demonstrate optical multiplexing of 40-Gbit/s channels at different wavelengths onto a single 640-Gbit/s channel and subsequent 640-to-10-Gbit/s demultiplexing using cascaded nonlinear optical loop mirrors. An average penalty of ~3.5 dB at 10-9 BER is observed after the nonlinear processes.
We report phase-transparent DQPSK data exchange using parametric depletion in a highly nonlinear fiber. 100-Gbit/s DQPSK data exchange is demonstrated with a power penalty less than 5dB. Pump misalignment tolerance (+/-2ps) and input signal power dynamic range (~20dB) are investigated.
We report the phase-transparent optical data exchange based on non-degenerate FWM in an HNLF via theoretical analysis and experimental verification. 40-Gbit/s NRZ-DPSK data exchange is demonstrated with a power penalty (at 10-9) ~ 4.5 dB.
We demonstrate tunable-fold multicasting of 40 Gb/s RZ-OOK channels via supercontinuum slicing by a polarization based tunable periodic filter. 2-, 4-, and 8-fold multicasting are achieved with average power penalties of 0.1, 0.26, 0.44 dB, respectively, at a BER of 10-9.
We demonstrate a technique for optical performance monitoring by simultaneously identifying optical signal-to-noise ratio (OSNR), chromatic dispersion (CD), and polarization mode dispersion (PMD) using artificial neural networks trained with parameters derived from delay-tap asynchronous sampling.
Effects of CD and first order PMD on the shape of the constellation diagrams of DQPSK systems are presented, and by quantifying variations in the constellation diagrams, a figure of merit is obtained which can be used for computing the amount of dispersion.
Limitations and potentials of nonlinearities in PPLN waveguides for ultra-fast all-optical processing have been experimentally investigated. A combination of pump depletion effect and SFG+DFG have been exploited to realize 320Gb/s optical demultiplexing and wavelength conversion.
We experimentally demonstrate concatenated 4-fold 40-Gbit/s signal multicasting, 4-fold 40-to-160-Gbit/s multiplexing and subsequent 160-to-40-Gbit/s demultiplexing based on supercontinuum generation and cross-phase modulation in highly nonlinear fibers. 5-9 dB penalty at 10-9 BER was observed after the nonlinear processes.
We experimentally demonstrate an RF-tone assisted OFDM transmission. Our system has a 5-dB better sensitivity compared to the conventional baseband SSB-OFDM and exhibits a negligible penally transmission after 260 km of SSMF.
We experimentally demonstrate a monitoring method for determining misalignment between the I/Q data streams and between the data and pulse-carving in an 80-Gbit/s serial RZ- DQPSK transmitter. We show a dynamic-range of 8 dB for I/Q data misalignment and 6 dB for data to carver misalignment.
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