361 research outputs found
Comparison of Nonlinear Phase Noise and Intrachannel Four-Wave-Mixing for RZ-DPSK Signals in Dispersive Transmission Systems
Self-phase modulation induced nonlinear phase noise is reduced with the
increase of fiber dispersion but intrachannel four-wave-mixing (IFWM) is
increased with dispersion. Both degrading DPSK signals, the standard deviation
of nonlinear phase noise induced differential phase is about three times that
from IFWM even in highly dispersive transmission systems.Comment: 3 pages, 2 figure
Simultaneous Amplitude and Phase Measurement for Periodic Optical Signals Using Time-Resolved Optical Filtering
Time-resolved optical filtering (TROF) measures the spectrogram or sonogram
by a fast photodiode followed a tunable narrowband optical filter. For periodic
signal and to match the sonogram, numerical TROF algorithm is used to find the
original complex electric field or equivalently both the amplitude and phase.
For phase-modulated optical signals, the TROF algorithm is initiated using the
craters and ridges of the sonogram.Comment: 10 pages, 5 figure
On the effect of dispersion on nonlinear phase noise
The variance of nonlinear phase noise is analyzed by including the effect of
intrachannel cross-phase modulation (IXPM)-induced nonlinear phase noise.
Consistent with Ho and Wang [1] but in contrary to the conclusion of both Kumar
[2] and Green et al. [3], the variance of nonlinear phase noise does not
decrease much with the increase of chromatic dispersion. The results are
consistent with a careful reexamination of both Kumar [2] and Green et al. [3].Comment: 3 pages, 1 figure, submitted to Optics Letter
Phase and Amplitude Responses of Narrow-Band Optical Filter Measured by Microwave Network Analyzer
The phase and amplitude responses of a narrow-band optical filter are
measured simultaneously using a microwave network analyzer. The measurement is
based on an interferometric arrangement to split light into two paths and then
combine them. In one of the two paths, a Mach-Zehnder modulator generates two
tones without carrier and the narrow-band optical filter just passes through
one of the tones. The temperature and environmental variations are removed by
separated phase and amplitude averaging. The amplitude and phase responses of
the optical filter are measured to the resolution and accuracy of the network
analyzer
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