Integrated dispersion slope equalizer of AWG-based optical CDMA for radio-over-fiber transmissions |
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Authors: | Chih-Ta Yen |
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Affiliation: | 1.Department of Electrical Engineering,National Formosa University,Yunlin,Taiwan |
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Abstract: | Chromatic dispersion from optical fiber is the most important problem that produces temporal skews and destroys the rectangular
structure of code patterns in the spectra-amplitude-coding optical code-division multiple-access (SAC-OCDMA) system. Thus,
the balance detection does not work perfectly and the system performance will be degraded. In order to improve the distortion,
we apply cascaded Mach–Zehnder interferometers (MZIs) to design a dispersion slope equalizer for the SAC-OCDMA system integrated
with arrayed-waveguide grating (AWG) router coder. The dispersion slopes of a cascaded MZI compensator could be adjusted by
the arm length differences of MZIs and be complementary with the fiber links. In this study, we present a set of length differences
for 10 km long single-mode fiber (SMF) and verify the compensation scheme by relative delay time slope and signal-to-interference
ratio (SIR). The dispersion slope equalizer with perfect complementary slope successfully compensates the dispersion from
SMF and the system performance with dispersion slope equalizer is highly improved. |
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