[17p-418-1~13] 3.8 Optical measurement, instrumentation, and sensor

[17p-418-3] Novel digital phase meter for measuring optical beat signals

〇Wataru Kokuyama¹, Sho Okubo^1,2, Hajime Inaba^1,2, Shinya Yanagimachi¹, Koichiro Hattori¹ (1.AIST, 2.JST-ERATO)

Keywords:Phase/frequency measurement, optical beat signal, frequency counter

We have developed novel digital phase meter using FPGA technology. It can measure dynamic phase variation. In addition, there is no need for so-called phase unwrapping, because it uses novel digital phase measuring algorithm. Noise limit of the phase meter is under 10^-19, as Allan variance at 1 sec for 633-nm optical signal. We also conducted vaditation with national phase noise standard and confirmed that results from the phase meter is agree within 0.2 dBc/Hz with the standard.