Separating arbitrary free-space beams with an integrated photonic processor  

作　　者：Maziyar Milanizadeh SeyedMohammad SeyedinNavadeh Francesco Zanetto Vittorio Grimaldi Christian De Vita Charalambos Klitis Marc Sorel Giorgio Ferrari David A.B.Miller Andrea Melloni Francesco Morichetti 

机构地区：[1]Department of Electronics,Information and Bioengineering,Politecnico di Milano,via Ponzio 34/5,20133,Milano,Italy [2]School of Engineering,University of Glasgow,Glasgow,G128QQ,UK [3]TeCIP Institute,Scuola Superiore Sant’Anna,56124,Pisa,Italy [4]Ginzton Laboratory,Stanford University,Spilker Building,Stanford,CA,94305,USA

出　　处：《Light(Science & Applications)》2022年第8期1811-1822,共12页光（科学与应用)（英文版）

基　　金：the European Commission,Horizon 2020 Programme(SuperPixels,grant no.829116);by the Air Force Office of Scientific Research(AFOSR,grant no.FA9550-17-1-0002).

摘　　要：Free-space optics naturally offers multiple-channel communications and sensing exploitable in many applications. The different optical beams will, however, generally be overlapping at the receiver, and, especially with atmospheric turbulence or other scattering or aberrations, the arriving beam shapes may not even be known in advance. We show that such beams can be still separated in the optical domain, and simultaneously detected with negligible cross-talk, even if they share the same wavelength and polarization, and even with unknown arriving beam shapes. The kernel of the adaptive multibeam receiver presented in this work is a programmable integrated photonic processor that is coupled to free-space beams through a two-dimensional array of optical antennas. We demonstrate separation of beam pairs arriving from different directions, with overlapping spatial modes in the same direction, and even with mixing between the beams deliberately added in the path. With the circuit’s optical bandwidth of more than 40 nm, this approach offers an enabling technology for the evolution of FSO from single-beam to multibeam space-division multiplexed systems in a perturbed environment, which has been a game-changing transition in fiber-optic systems.

关 键 词：PROCESSOR polarization scattering 

分 类 号：TN256[电子电信—物理电子学]