In-band noise suppression using novel monolithically integrated semiconductor optical amplifier-based ultra-compact interferometers

E. Moll, D. Reading-Picopoulos, K. A. Williams, R. V. Penty, I. H. White

Research output: Contribution to journalArticle

2 Citations (Scopus)


Novel all-optical noise suppressors based on the nonlinear transfer function properties of monolithically integrated active waveguide interferometers are proposed and demonstrated. Through a power map imbalance between the two arms of the interferometers, each of which contains multi-contact semiconductor optical amplifiers, a nonlinear transfer function is created, which can then be exploited to achieve in-band noise suppression. The authors demonstrate the use of such a mechanism in ultra-compact Mach-Zehnder and Michelson interferometers (MIs). Experimental work demonstrates a 5.0dB optical signal-to-noise ratio improvement for the Mach-Zehnder and an 8.4dB improvement for the MIs, respectively. It is shown that for input data the Mach-Zehnder is capable of providing a Q factor improvement of 4.1dB. To the authors' knowledge, these devices constitute the smallest integrated interferometer structures reported to date demonstrating in-band noise suppression.

Original languageEnglish
Pages (from-to)105-110
Number of pages6
JournalIET Optoelectronics
Issue number3
Publication statusPublished - 30 Jun 2008

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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