The exponentially increasing capacity demand in information systems will be met by carefully exploiting the complementary strengths of electronics and optics1,2. Optical signal processing provides simple but powerful pipeline functions that offer high speed, low power, low latency and a route to densely parallel execution3. A number of functions such as modulation and sampling4,5,6,7, complex filtering8 and Fourier transformation9 have already been demonstrated. However, the key functionality of all-optical quantization has still not been addressed effectively. Here, we report an all-optical signal processing architecture that enables, for the first time, multilevel all-optical quantization of phase-encoded optical signals. A four-wave-mixing process is used to generate a comb of phase harmonics of the input signal, and a two-pump parametric process to coherently combine a selected harmonic with the input signal, realizing phase quantization. We experimentally demonstrate operation up to six levels.
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This research received funding from the European Communities Seventh Framework Programme FP/2007-2013 (grant agreements 224547 (PHASORS) and 216863 (BONE)). The authors thank P. Horak and P. Smith for useful discussions. This work was supported in part by the EPSRC grant EP/I01196X.
The authors declare no competing financial interests.
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Kakande, J., Slavík, R., Parmigiani, F. et al. Multilevel quantization of optical phase in a novel coherent parametric mixer architecture. Nature Photon 5, 748–752 (2011). https://doi.org/10.1038/nphoton.2011.254
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