“…Meanwhile, this ring resonator can effectively suppress the standing wave effect and the spatial hole burning, which can be widely used in developing high precision laser measurement, precision spectroscopy, frequency measurement, and coherent information processing. Ring resonator structure is an effective method to obtain high power traveling wave laser in a variety of optical precision detection fields; most sensors, such as four frequency differential laser gyros [3] and fiber interferometer filter [4], are composed partially by making use of it. These sensors, which possess the properties of high accuracy, strong ability to resist severe environment, long-lasting life spans, and broad dynamic range [5,6], are widely applied to measure the physical quantity [7], biochemical quantity [8], biomass parameter [9], and so on.…”