MEASUREMENT DEVICE, METHOD, PROGRAM, AND RECORDING MEDIUM

摘要

A frequency resolution for measuring transmission characteristics of a device under test is increased. With a measuring device 1 including a first terahertz light generator 18 that generates incident light, a second terahertz light generator 28 that generates reference light having an optical frequency f 1 - f 2 - f IF different from an optical frequency f 1 -f 2 of the incident light by a constant difference frequency f IF , a terahertz light detector 44 which outputs an light detection signal having the difference frequency f IF based on response light obtained by making the incident light incident to an optical fiber 2 and the reference light, and a network analyzer 50 that receives the light detection signal, thereby measuring characteristics of the optical fiber 2, a spectrum of the incident light (terahertz light) incident to the optical fiber 2 includes the carrier frequency (f 1 -f 2 ), but does not include sideband frequencies (f 1 -f 2 ±f IF ). It is thus possible to reduce the effective spectrum width of the incident light. As a result, the frequency resolution increases in the measurement of the transmission characteristics of the optical fiber 2.