Wavelength stabilized module, stable wavelength laser beam generating device and optical communication system

摘要

A wavelength stabilization module which can restrain light reflected by the fiber grating from returning to a light source, and a stable wavelength laser beam generating device. A wavelength stabilization module of the invention comprises an optical splitter 122 for splitting light lead from a light source 110 through a fiber 143 into first and second lights, a fiber grating 210 which has light of a specific wavelength in the first light pass therethrough and reflects light of the other wavelengths in the first light, and a light quantity change operating unit 311 for detecting a change in quantity of light passing through the fiber grating using the second light as reference light, and is configured to direct light, reflected by the fiber grating 210, to the outside of the fiber, and is configured to feed back the detected change in light quantity to the light source 110.