Dynamic guided spontaneous-emission circuit technique with an SNR enhancement factor of 22.5 dB for optical power variation measurement

Abstract

This study proposes a dynamic guided spontaneous-emission circuit (DGSEC) technique that achieves significantly enhanced signal-to-noise ratios (SNRs) for optical power variation measurement. The output power (P_out), time constant (τ), slope (S), and SNR enhancement factor (ΔSNR) of the DGSEC are experimentally investigated and clarified for the first time. Experimental results confirm that an increase in P_out leads to a decrease in τ (advantage) and decreases in S and ΔSNR (drawbacks), thereby establishing trade-off relationships among the four parameters. A remote sensing experiment over a 15-km single-mode fiber demonstrates successful operation of an optimized DGSEC with a ΔSNR of approximately 22.5 dB.