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• W2070808112 abstract "We review our recent achievements in the optical performance monitoring techniques such as the optical phasormonitor and optical signal-to-noise ratio (OSNR) monitor developed for differential phase-shift-keyed (DPSK) andquaternary PSK (DQPSK) signals. The optical phasor monitor is a tool that can measure the in-phase and quadraturecomponents of the optical field of the phase-modulated signal and display the measured results on the complex plane as aphasor. We implement such a phasor monitor by using an adjustment-free differential-phase demodulator composed of a120-degree optical hybrid (which can be realized simply by using a conventional 3x3 optical coupler), and demonstrateits plug-and-play (i.e., phase-adjustment free and wavelength/polarization-independent) operation experimentally. Wealso show that the proposed phasor monitor is well suited for the use in the diagnosis of DPSK/DQPSK. The OSNRmonitoring is another important function to evaluate the signal quality as well as the condition of the transmission link.We have recently proposed a new technique for monitoring the 'in-band' OSNR of DPSK/DQPSK signals. Thistechnique estimates the OSNR by analyzing the radio frequency (RF) spectrum obtained by the self-heterodyne detection.In this paper, we briefly explain its operating principle and show the experimental results. Using this technique, wecould accurately monitor the OSNR of the 10-Gb/s DPSK and 20-Gb/s DQPSK signals in a 640-km long transmissionlink. The results also show that the performance of the proposed technique is not sensitive to the effects of chromaticdispersion and polarization-mode dispersion." @default.
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• W2070808112 date "2008-11-13" @default.
• W2070808112 modified "2023-09-27" @default.
• W2070808112 title "Monitoring techniques for phase and OSNR of DPSK/DQPSK signals" @default.
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• W2070808112 doi "https://doi.org/10.1117/12.803097" @default.
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