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Circulator‐Free Brillouin Photonic Planar Circuit
Author(s) -
Liu Yang,
Choudhary Amol,
Ren Guanghui,
Choi DukYong,
CasasBedoya Alvaro,
Morrison Blair,
Ma Pan,
Nguyen Thach G.,
Mitchell Arnan,
Madden Stephen J.,
Marpaung David,
Eggleton Benjamin J.
Publication year - 2021
Publication title -
laser and photonics reviews
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.778
H-Index - 116
eISSN - 1863-8899
pISSN - 1863-8880
DOI - 10.1002/lpor.202000481
Subject(s) - circulator , brillouin scattering , brillouin zone , photonics , photonic integrated circuit , optics , waveguide , planar , physics , slow light , optical circulator , optoelectronics , photonic crystal , materials science , electronic engineering , computer science , optical fiber , engineering , computer graphics (images)
On‐chip stimulated Brillouin scattering (SBS) that results from enhanced light–sound interactions, has recently demonstrated great applicability and versatility for signal generation and manipulation. Progress toward realizing fully integrated Brillouin photonic circuits is promising; however, the control and routing of on‐chip optical waves requires non‐reciprocal elements such as circulators, which is challenging and adds complexity. Here, a circulator‐free Brillouin photonic planar waveguide circuit which eliminates the need for separate non‐reciprocal elements is demonstrated. Backward inter‐modal Brillouin scattering (BIBS) is used in a planar photonic integrated circuit, for the first time, to provide Brillouin processing capability in a multi‐modal waveguide, conveniently allowing for the separation of counter‐propagating pump and signal using passive integrated mode‐selective filters. Using an As 2 S 3 –Si hybrid multi‐modal photonic circuit, inter‐optical‐mode energy transfer with a Brillouin gain coefficient of 280 m −1 W −1 is experimentally demonstrated, representing two orders of magnitude enhancement compared to conventional optical fibers. This on‐chip BIBS circuit allows for independent routing of pump and signal waves, showing resilience to the cross talk. The experimental demonstrations provide an important basis for achieving fully integrated Brillouin photonic circuits without requiring on‐chip circulators and fine spectral filtering, opening a new dimension for studying spatial‐dependent photon–phonon nonlinear dynamics.