We present an improvement of an analog optical transmission performance by reducing both the nonlinearity and the periodic RF carrier suppression. The proposed technique takes advantage of the gain saturation characteristic of semiconductor optical amplifier (SOA) to reduce the intrinsic nonlinearity of electroabsorption-modulated laser (EML) and the negative chirp characteristic of SOA and EML to expand the transmission length and operating frequency. Furthermore, RF signal gain was also obtained through optical signal amplification.
A novel linearization process in electroabsorption modulated laser (EML) is proposed and experimentally demonstrated. Dual-parallel modulation scheme is used to compensate the nonlinear component of the EML by controlling the DC bias voltages of the each EML separately. The simulations on the nonlinearity of EML and linearization process are performed in both time and frequency domains. The validity of the proposed modulation scheme is confirmed through the experiments. From a dual-parallel modulation experiment at 8GHz, a reduction of 23dB in IMD3 and the following increase of linear dynamic rage of 19.6dB are achieved compared to those of a single EML operation.
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