Abstract
We demonstrate the first self-coherent detection of 10 Gbit/s BPSK signals based on narrow-band amplification of the optical carrier by means of Stimulated Brillouin effect in a common fiber. We found that this technique is very effective only if it is combined with proper line coding and high-pass electrical filtering at the receiver. In this case we obtain OSNR-performance close to the ideal coherent receiver.
Highlights
Optical coherent systems recently re-gained a lot of attention thanks to Digital Signal Processing (DSP), which promises to solve the polarization and phase locking issues that so far prevented the realization of coherent optical systems
Whilst DSP-based systems were proven to be effective at 40 Gbit/s [1], it is not yet clear if they could be efficiently scaled to higher rates (i.e. 100 Gbit/s) because of the increasing complexity and cost: practical electronic processing must implement a substantial number of complex functions
We have presented the first proof-of-principle system demonstration that a self-coherent receiver can be effectively realized by using the selective amplification of the carrier by stimulated Brillouin effect
Summary
Optical coherent systems recently re-gained a lot of attention thanks to Digital Signal Processing (DSP), which promises to solve the polarization and phase locking issues that so far prevented the realization of coherent optical systems. Whilst DSP-based systems were proven to be effective at 40 Gbit/s [1], it is not yet clear if they could be efficiently scaled to higher rates (i.e. 100 Gbit/s) because of the increasing complexity and cost: practical electronic processing must implement a substantial number of complex functions (e.g. recovery of the carrier polarization, frequency and phase, clock recovery and signal equalization [2]). All-optical self-homodyne detection (SHD) is a promising technique that can alleviate the constrains of DSP-enabled receivers. It was demonstrated using a pilot carrier, having a polarization state orthogonal with respect to that of the signal [3]. A similar solution may be used for OFDM signals [5]
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