Optical noise figure calculation method, optical noise figure calculation device and optical sampling oscilloscope

摘要

Signal pulse of the signal pulse illuminant 11 and sampling pulse of the sampling pulse illuminant 10 incidence were done in optical fiber 20, light absorbent section 33 measured the optical power after the optical fiber 20 passing, light absorbent section 31 light after the optical fiber 20 passing furthermore to measure the power of the light which makes 0 degree polarizer pass 51, light absorbent section 32 furthermore 90 degree polarizer to measure the power of the light which makes 40 and optical filter pass 70, arithmetic logical unit 80, from the optical power which was measured in light absorbent section 31,32,33 in 90 degree polarizer later, was sampled the light after the optical fiber 20 passingCalculating optical noise OSNR _out, in order to calculate optical noise figure NF, it constitutes.