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The theory of temporal average with a moving diffuser for suppressing speckle is realized by the experiment used a rigid PVC sheet and a treated K9 glass controlled by an external motor. By controlling the mechanical vibration of moving diffuser, a good speckle contrast can be achieved without loss of detailed information. The images about the speckle suppression and detailed information can be directly...
The optical loss of large-core fibers was investigated theoretically and experimentally. An optical system is built to realize the measurement of the fiber loss without cutting the fibers. The connector loss and the fiber loss are given simultaneously. The fiber loss at short wavelength is much larger than that at long wave length.
We demonstrate a simple DFB fiber laser hydrophone and its demodulation is realized by a simple intensity based scheme. DFB fiber lasers with and without packaging structures are used as hydrophones and their measurement results are given. The frequency response of the DFB fiber laser based hydrophone is measured in an anechoic water pool. The feasibility of the hydrophone is proved by a referenced...
We proposed a novel intensity modulation based composite cavity optical fiber laser (CCFL) sensor, which is suitable for the vibration measurement. The intensity modulation of the CCFL is caused by the modulation of the weak feedback of the CCFL. The weak feedback of the CCFL is based on the end face reflection and the Rayleigh scattering of optical fiber. An acoustic measurement of the CCFL sensor...
We demonstrate a new kind of six cores photonic liquid crystal fibers (PLCFs) which are arrayed in a ring-type geometry and separated by the air holes. Based on the single mode conditions of PLCFs we found, we design structure parameters of the liquid cores to fulfill that only the fundamental mode transmits in the liquid cores. Through changing the wavelength, the diameter of the liquid cores, the...
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