Multichannel phase-sensitive amplification in a low-loss CMOS-compatible spiral waveguide.

Abstract

We investigate single-channel and multichannel phase-sensitive amplification (PSA) in a highly nonlinear, CMOS-compatible spiral waveguide with ultralow linear and negligible nonlinear losses. We achieve a net gain of 10.4dB and an extinction ratio of 24.6dB for single-channel operation, as well as a 5dB gain and a 15dB extinction ratio spanning over a bandwidth of 24nm for multiple-channel operation. In addition, we derive a simple analytic solution that enables calculating the maximum phase-sensitive gain in any Kerr medium featuring linear and nonlinear losses. These results not only give a clear guideline for designing PSA-based amplifiers but also show that it is possible to implement both optical regeneration and amplification in a single on-chip device.