Liu, Hao, Bottrill, Kyle, Vitali, Valerio, Demirtzioglou, Iosif, Adamu, Nura, Lacava, Cosimo, Yan, Xingzhao, Banakar, Mehdi, Tran, Ying, Ebert, Martin, Le Besque, James, Sandell, Elliot, Dominguez Bucio, Thalia, Littlejohns, Callum, Thomson, David, Gardes, Frederic and Petropoulos, Periklis (2025) Monolithically integrated silicon photonic wavelength converter with on-chip widely tunable idler filtering. Photonics Research, 13 (11). (doi:10.1364/PRJ.565545). (In Press)
Abstract
All-optical wavelength conversion is a key technology for resolving wavelength contention challenges in routing and switching in a format- and transmission-rate-transparent fashion. Silicon-on-insulator devices, with their high optical confinement and large Kerr coefficient, hold promise for the on-chip integration of efficient wavelength converters. However, integrated wavelength converters based on Four-Wave Mixing still face challenges, such as the inefficiency of the process, which is exacerbated by the need for off-chip filtering. Such filtering is essential to suppress the residual pump(s) and signal, ensuring the output spectrum predominantly contains the newly generated idler. While on-chip filtering has already been demonstrated, aspects such as idler continuous tunability and system performance when operating with high-symbol-rate signals remain unexplored. We present a silicon photonic wavelength converter with an integrated filter that achieves widely tunable filtering over 25 nm, with a pump and modulated
signal suppression ratio exceeding 52 dB. The operation of the device with telecommunication signals is demonstrated across the C-band.
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