Impact of pump phase modulation on system performance of fibre-optical parametric amplifiers
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چکیده
Introduction: Fibre-optical parametric amplifiers (FOPAs) have shown promising results in terms of both gain level [1] and amplification bandwidth [2]. But some challenges remain to realise practical FOPAs for optical telecommunications [3]. One of the main difficulties is raised by the stimulated Brillouin backscattering experienced by the continuous-wave pump. The phase modulation of the pump by a pseudorandom bit sequence (PRBS) is the most widespread solution to overcome this problem, even though an alternative modulation format based on sinusoids has been proposed [4]. Thanks to the phase modulation, the pump can propagate without backscattering in the nonlinear fibre and produce parametric gain. The level of gain is one of the essential characteristics of an FOPA but it is not the only one: channels must also be amplified without distortion. It is shown theoretically that, because of the phase-matching condition between the pump and the channel, the phase modulation of the pump may induce distortions [5]. In this Letter, we report bit error rate (BER) measurements that quantify the penalty for three different phase modulation formats and on the spectral amplification band.
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تاریخ انتشار 2013