Abstract
It is important to consider optical reflection conditions when designing fiber-oriented wireless access systems around subcarrier optical transmission since the noise characteristic can be significantly degraded by optical reflection, especially if narrow spectral width devices are used. The superluminescent diode (SLD) offers stable noise and 3rd-order intermodulation distortion (IM3) characteristics that follow the ideal cubic law, even under multiple optical reflection. The SLD-predistorter combination is proposed as a way to overcome the SLD's narrow dynamic range. It is experimentally found that the predistorter reduces IM3 by 8 dB. The receiver sensitivity of a practical system that uses the SLD-predistorter combination is discussed from the viewpoint of overall design. A superimposed subcarrier modulation (SSM) technique is also proposed in order to reduce the reflection noise. We experimentally confirm that the SSM technique reduces the noise degradation and provides stable optical transmission. An SSM design methodology is presented that takes both noise and linearity into account. The SLD-predistorter and the SSM scheme make it possible to realize stable transmission performance and wider dynamic range in the presence of optical reflection.
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