Equipment and method for measuring loss and crosstalk that occur in optical fiber transmission line

An apparatus for measuring a loss and crosstalk of an optical fiber targeted for measurement, the apparatus comprising:

• a light injecting unit configured to inject a frequency-swept probe light into one end of the optical fiber targeted for measurement and inject a pump light having a frequency difference corresponding to a Brillouin frequency shift amount, with respect to the probe light, into the other end of the optical fiber targeted for measurement, and thereby amplify the probe light in the optical fiber targeted for measurement;
• a light receiving unit configured to receive a multiplexed light obtained by multiplexing a local light, given a delay time by injection into a delay optical fiber having a length corresponding to a group delay time in propagation through an entire path of the optical fiber targeted for measurement as a fundamental mode, with the probe light output from the optical fiber targeted for measurement;
• an interference waveform measurement unit configured to measure an interference waveform between the probe light and the local light using a signal intensity obtained from the light receiving unit;
• a fundamental mode time waveform analysis unit configured to acquire a fundamental mode time waveform of a probe light that has propagated through the entire path of the optical fiber targeted for measurement as a fundamental mode, based on the interference waveform;
• and
• a control calculation unit configured to calculate a loss and crosstalk at a desired point of the optical fiber targeted for measurement, based on the fundamental mode time waveform.