A novel scheme for tunable optical pulse generation based on fiber sagnac loop was proposed and studied. The key
parameters of the optical pulse were analyzed and testified by simulations and experiments. The repetition rate of optical
pulse is twice the frequency of external square wave modulation signal and can be tuned directly by varying modulation
frequency. The maximal peak value can be achieved when the peak-peak value of the square wave modulation signal
was equal to the half-wave voltage of the phase modulator. Experimental results agree well with theoretical predictions
and simulations.
A wavelength division multiplied (WDM) polarization-maintain fiber sensor system for simultaneous temperature
and pressure measurement is proposed. The system comprises a PANDA fiber polarimetric temperature sensor and a
highly birefringent photonic crystal fiber (PCF) polarimetric pressure sensor, which are multiplexed by use of a
WDM beam splitter/combiner and interrogated in wavelength domain by using a combination of a broadband source
and an optical spectrum analyzer. Preliminary experiments demonstrate a temperature sensitivity of about 1.16nm/oC
and a pressure sensitivity of 2.42nm/MPa with respectively 162.7mm of PANDA fiber and 262.8mm of PCF.
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