Deep learning of ultrafast pulses with a multimode fiber

Wen Xiong, Brandon Redding, Shai Gertler, Yaron Bromberg, Hemant D. Tagare, Hui Cao

Research output: Contribution to journalArticlepeer-review


Characterizing ultrashort optical pulses has always been a critical but difficult task, which has a broad range of applications. We propose and demonstrate a self-referenced method of characterizing ultrafast pulses with a multimode fiber. The linear and nonlinear speckle patterns formed at the distal end of a multimode fiber are used to recover the spectral amplitude and phase of an unknown pulse. We deploy a deep learning algorithm for phase recovery. The diversity of spatial and spectral modes in a multimode fiber removes any ambiguity in the sign of the recovered spectral phase. Our technique allows for single-shot pulse characterization in a simple experimental setup. This work reveals the potential of multimode fibers as a versatile and multi-functional platform for optical sensing.

Original languageAmerican English
Article number096106
JournalAPL Photonics
Issue number9
StatePublished - 1 Sep 2020
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Computer Networks and Communications


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