4.6 Article

Power optimization for phase quantization with SOAs using the gain extinction ratio

Journal

OPTICS EXPRESS
Volume 29, Issue 2, Pages 1545-1557

Publisher

OPTICAL SOC AMER
DOI: 10.1364/OE.410973

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Funding

  1. People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme FP7
  2. Ministry of Human Resource Development (SPARC)
  3. Ministry of Electronics and Information technology (MEITYPHD-2695, Visvesvaraya PhD Scheme)
  4. Department of Science and Technology, Ministry of Science and Technology, India
  5. Vajra Scheme of Science and Engineering Research Board, Government of India [VJR/2017/000152]

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This paper introduces a general method for optimizing phase quantization using a PSA made using an SOA, and demonstrates two- and four-level phase quantization schemes experimentally. The research shows that using an SOA can achieve pump power levels as low as 1mW at the optimized gain extinction ratio.
Phase-sensitive amplifiers (PSAs) can work as M - level phase quantizers when waves generated with specific phase values are allowed to mix coherently in a nonlinear medium. The quality of an M - level phase quantizer depends on the relative powers of the mixing waves and requires their optimization. If the mixing waves also experience gain in the nonlinear medium, such as in semiconductor optical amplifiers (SOAs), this optimization becomes non-trivial. In this paper, we present a general method to optimize phase quantization using a PSA made using an SOA, based on gain extinction ratio (GER), which is an experimentally measurable quantity. We present a simple theory to derive the optimal GER required to achieve an M -level quantization. We further experimentally demonstrate two- and four-level phase quantization schemes with an SOA, operated at the optimized GER, with pump power levels as low as 1 mW. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

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