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A generation approach of photonic logic minterms and maxterms, which is fully reconfigured minterms and maxterms for four-input 40-Gb/s differential phase-shift keying (DPSK) signals, has been demonstrated based on delay interferometers and semiconductor optical amplifiers. The maxterms are directly derived by inverting the corresponding minterms, according to their complementary characteristics....
Covert communications are conducted at a low received signal-to-noise ratio (SNR) to prevent interception or detection by an eavesdropper, and successful detection in this particular area heavily relies on the processing gain achieved by employing the direct-sequence spread-spectrum (DSSS) technique. If covert communications take place in underwater acoustic (UWA) environments, then additional challenges...
We demonstrate a novel scheme to generate return-to-zero/carrier-suppressed return-to-zero differential phase-shift keyed (RZ/CSRZ-DPSK) signal, which needs only one Mach-Zehnder modulator (MZM). It is more cost-effective compared to conventional schemes due to its simple configuration
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