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Phase mask encryption is proposed to improve the transmission privacy of an optical steganography system. The stealth signal carried by amplified spontaneous emission noise is encrypted by a fast changing code.
A digital-signal-processing-assisted optical coherent detection of an uplink radio-over-fiber signal with a two-tone local light, which is insensitive to laser phase noises, is newly proposed and its phase noise cancellation effect is experimentally demonstrated.
We present an all optical technique to demodulate THz signals on optical carriers using a standard optical phase modulator and an RF synthesizer. Noise floor as low as −95 dBc/Hz is reached at 700 GHz.
Pure-silica-core fiber with ultra-low loss of 0.15dB/km and appropriately enlarged Aeff of 130µm2, representing the highest figure-of-merit for digital coherent systems, is presented for supporting high capacity long haul optical transmissions in very near future.
120 Gb/s DP-QPSK transmission through ROADM systems utilizing either Broadcast-and-Select or Route-and-Select architectures is compared experimentally. Performance comparisons include passband narrowing and cumulative crosstalk effects due to non-ideal WSS filtering characteristics.
For Nyquist signals generated via transmitter digital signal processing, optimal transceiver signal clipping levels are studied for different polarization coupling angles and different chromatic dispersion values in 43 Gb/s polarization multiplexing QPSK systems.
Ultra-broad band (in S+C+L band), highly-efficient coherent wavelength-conversion at low-power by four-wave-mixing in high-gain InAs/InGaAsP/InP QD-SOA is reported. Wavelength conversion transparency for coherent signals (QPSK, 8-PSK and 16-QAM) is showed for single and double-pump FWM.
We present ultrahigh-speed transmission of 3.84-Tbit/s 64-QAM signal in Si ridge and Si slot waveguides. Si slot waveguide confining light in air slot region features reduced nonlinearity and resultant superior transmission performance with low penalty for varied input signal power from 1 to 250 mW.
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