Apparatus and method for optic fiber measurement based on brillouin optical correlation domain analysis using pulse waveform control of bits

An apparatus for optic fiber measurement based on Brillouin optical correlation domain analysis using pulse waveform control of bits, the apparatus comprising:

• a PRBS generation unit generating two identical electrical pulse pattern signals to be modulated in phase so that a probe optical signal and a pump optical signal have a time difference according to a pseudo-random bit sequence, the two identical electrical pulse pattern signals being generated to have the time difference in a sub-bit unit which is shorter than a time interval of one bit, and generating a first PRBS signal and a second PRBS signal by distorting a per-bit pulse waveform of each of the two pulse pattern signals;
• a probe phase modulation unit performing phase modulation of the probe optical signal according to the first PRBS signal;
• a pump phase modulation unit performing phase modulation of the pump optical signal according to the second PRBS signal;
• and
• a BOCDA sensor unit having a sensing optical fiber and measuring a Brillouin gain spectrum by inputting the probe optical signal and the pump optical signal with the time difference, which is generated according to outputs from the probe phase modulation unit and the pump phase modulation unit, to both ends of the sensing optical fiber.