From Event: SPIE Optical Engineering + Applications, 2016
In this paper, we present our recent results in the area of microwave photonics. Integrated microwave photonic bandpass
and bandstop filters were realized using stimulated Brillouin scattering (SBS). Our recent breakthrough in the fabrication
of chalcogenide waveguides has allowed us to achieve an on-chip SBS gain of >40 dB, enabling for the first time the
tailoring of the SBS response well beyond the intrinsic linewidth (~30 MHz). An electrical comb generated by an
arbitrary waveform generator was modulated onto an optical carrier to generate a broadened pump which via the SBS
effect created a flat and rectangular bandpass filter response in the RF domain. Controlling the number of pump lines
allowed bandwidth reconfigurability from 30 MHz to 440 MHz. The measured selectivity and the passband ripple were
>20 dB and <1.9 dB, respectively and the center frequency of the filter was tuned up to 30 GHz. A bandstop filter
response was realized by using a novel RF interferometry technique via accurate control of the amplitude and phase of
the sidebands of the modulated probe. The bandwidth was reconfigurable from 75 MHz-300 MHz and the central
frequency of the filter was tunable up to 30 GHz.
Amol Choudhary, Iman Aryanfar, Shayan Shahnia, Blair Morrison, Mattia Pagani, Yang Liu, Khu Vu, Stephen Madden, Barry Luther-Davies, David Marpaung, and Benjamin J. Eggleton, "Reconfigurable and frequency-agile on-chip microwave photonic bandpass and bandstop filters using stimulated Brillouin scattering," Proc. SPIE 9958, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications X, 99580E (Presented at SPIE Optical Engineering + Applications: August 28, 2016; Published: 7 September 2016); https://doi.org/10.1117/12.2235672.
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