Abstract
In this work we experimentally demonstrate the compensation of nonlinearities introduced by a semiconductor optical amplifier (SOA) operating as a power booster in a field-modulated direct detection fiber-optic system transmitter. We show that a combination of digital pre -compensation to deal with SOA nonlinearities, and digital post -compensation after Kramers-Kronig receiver for mitigating the impacts of chromatic dispersion and signal-signal beat interference (SSBI) is an effective scheme to gain ∼3dB in ROSNR in presence of SOA nonlinearity at 3dB of gain compression.
Highlights
Optical communication in the access layers and 5G fronthaul and backhaul require cost-effective optical systems with typically high spectral efficiency
For complex field modulated optical signal with direct detection, the effect of signal-signal beat interference (SSBI) is determined by carrier to signal power ratio (CSPR) of the optical signal
To find the optimum CSPR level for KK detection we used error vector magnitude (EVM) as the system performance measure, which is a measure of the average distance of the received complex symbol from its ideal position in the constellation diagram [9]
Summary
Optical communication in the access layers and 5G fronthaul and backhaul require cost-effective optical systems with typically high spectral efficiency. Complex field modulation is the typical modulation scheme used to achieve this requirement. In such systems, transmitters are commonly built with photonic integrated circuits with silicon photonics for its cost effectiveness and mass manufacturability. Optical amplification of the modulated signal is mandated in some applications that require enough transmitter power to pre-compensate for different system losses such as those from passive optical splitters or multiplexers. Fast gain saturation of an SOA at high signal power levels leads to symbol pattern-dependent signal distortion and system transmission performance impairments [3] through self-gain modulation, self-phase modulation, and inter-channel crosstalks in wavelength-division multiplexing applications
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