IEEE Photonics Technology Letters · 2008 · 28 citations · 4 references
EngineeringCommunicationElectrical EngineeringOpticsOptoelectronicsPhotonicsFiber OpticsFiber-optic CommunicationOptical Communication SystemsOptical FibersOptical ModulationOptical ModulatorsChromatic DispersionChromatic Dispersion CompensationEqualizationMach-zehnder ModulatorsOptical Transmission SystemsSignal-to-noise RatioSignal-to-noise Ratio ImprovementSingle-mode Fiber Propagation
We demonstrate an equalization technique to simultaneously compensate for the fiber chromatic dispersion and the distortions induced by the in-phase/quadrature-phase (I/Q) imbalances and bias deviation in the Mach-Zehnder modulators (MZMs). With this technique, the requirement for the monitoring circuits at the transmitter could be relaxed or even eliminated, and thus simplifies the system design and reduces the system cost. The system exhibits a good performance with our proposal over a broad range of imbalances and bias deviation in the MZM. With deliberately introducing I/Q imbalances and bias deviation, we have observed a 2- and 4-dB optical signal-to-noise ratio improvement, for the back-to-back and 800 km of uncompensated standard single-mode fiber transmission, respectively, with our proposed scheme.
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