Fiber optic lasers have been designed with rare-earth-doped fibers because of their potential use in laser systems is inversely proportional to the length of the cavity. For remote sensing,a fiber laser having cavities with different lengths generates different attracted more attention because that wavelength coincides with that ofintermodal spacing frequencies. These frequencies can be measured the region of least loss for silica fibers. . c avity , which can have a Fabry-Perot or ring configuration. The most common elements to form cavities are reflecting mirrors and fiber Bragg gratings, these have a wide advantage over the former because they are robust in nature.with a radio frequency (RF) analyzer and the length of the cavity can be calculated

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