Adaptive optical self-interference cancellation using a semiconductor optical amplifier

Matthew P. Chang, Chia Lo Lee, Ben Wu, Paul R. Prucnal

Research output: Contribution to journalArticlepeer-review

50 Scopus citations


We experimentally demonstrate an optical system that uses a semiconductor optical amplifier (SOA) to perform adaptive, analog self-interference cancellation for radio-frequency signals. The system subtracts a known interference signal from a corrupted received signal to recover a weak signal of interest. The SOA uses a combination of slow and fast light and cross-gain modulation to perform precise amplitude and phase matching to cancel the interference. The system achieves 38 dB of cancellation across 60-MHz instantaneous bandwidth and 56 dB of narrowband cancellation, limited by noise. The Nelder-Mead simplex algorithm is used to adaptively minimize the interference power through the control of the semiconductor's bias current and input optical power.

Original languageEnglish (US)
Article number7045446
Pages (from-to)1018-1021
Number of pages4
JournalIEEE Photonics Technology Letters
Issue number9
StatePublished - May 1 2015

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


  • Self-interference cancellation
  • co-site interference cancellation
  • microwave photonics


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