Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 38,
  • Issue 14,
  • pp. 3624-3636
  • (2020)

Broadband Brillouin Phase Shifter Utilizing RF Interference: Experimental Demonstration and Theoretical Analysis

Open Access Open Access

Abstract

Microwave photonic phase shifters based on stimulated Brillouin scattering (SBS) offer tunable and broadband, optically controllable phase shifts. However, achieving a 360° phase shift requires a large amount of SBS gain which often exceeds the available gain and power handling capability of an integrated waveguide. A Radio Frequency (RF) interference technique has recently been utilized in an integrated silicon platform, which uses forward Brillouin scattering in a suspended waveguide to compensate for the lack of available Brillouin gain in standard silicon on insulator platforms. This interference scheme amplifies the phase shift at the expense of link performance. Here, we demonstrate and analytically model a 360° ultra-broadband phase shifter using backward SBS in both fiber and on-chip by combining SBS and RF interference. The phase enhancement scheme greatly reduces the required Brillouin gain and thus the required optical power. Additionally, the backward architecture reduces filter requirements as the residual pump reflections are simpler to remove compared to the pump in the forward Brillouin scattering case, where the pump co-propagates with the signal. The model provides a deeper insight into the properties of the interferometric phase enhancement scheme and predicts the potential trade-offs of an optimized system, showing reduced link loss at higher levels of Brillouin gain. The model also predicts the sensitivity to variations of the interferometric components. Using this technique, we have demonstrated a broadband phase shift over an ultra-broad bandwidth of 0.1 – 65 GHz, limited only by the bandwidth of the available components. Also, we demonstrate a phase enhancement factor of 10 over a bandwidth of 18 GHz in an integrated chalcogenide waveguide.

PDF Article
More Like This
Brillouin-based phase shifter in a silicon waveguide

Luke McKay, Moritz Merklein, Alvaro Casas Bedoya, Amol Choudhary, Micah Jenkins, Charles Middleton, Alex Cramer, Joseph Devenport, Anthony Klee, Richard DeSalvo, and Benjamin J. Eggleton
Optica 6(7) 907-913 (2019)

Integrated microwave photonic true-time delay with interferometric delay enhancement based on Brillouin scattering and microring resonators

Luke McKay, Moritz Merklein, Yang Liu, Alex Cramer, Jordan Maksymow, Andrew Chilton, Kunlun Yan, Duk-Yong Choi, Stephen J. Madden, Richard DeSalvo, and Benjamin J. Eggleton
Opt. Express 28(24) 36020-36032 (2020)

Ultra-wideband microwave photonic phase shifter with configurable amplitude response

M. Pagani, D. Marpaung, and B. J. Eggleton
Opt. Lett. 39(20) 5854-5857 (2014)

Cited By

Optica participates in Crossref's Cited-By Linking service. Citing articles from Optica Publishing Group journals and other participating publishers are listed here.


Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved