Design of a New Type ATC System on the Light Source of FOG

Based on the request of fiber-optic gyro (FOG) on the automatic temperature control (ATC) system of light source, the main factors influencing changes of temperature in syntony cavity are given, one is the change of working condition temperature, the other is the radiation resulting from its working. The particularly mathematics analysis about the refrigeration principium of light source LD and the working procession of tradition ATC. The ATC mathematic model of LD is founded. According to the emulate results under the disturbing of high and low frequency, some parameters is optimized and improved, a new high precision, adjusting at plus and minus direction ATC system is designed. The power dissipation being saved, the heat radiation and the size of the driving circuit is also reduced greatly. A driving circuit with high precision, low power dissipation and small minimized size is realized. Finally the test results indicated that, in the temperature range of -30degC ~ 30degC,the present technology can make a temperature control precision 0.1degC and the variation of light power less than 0.1%, the system is helpful to the improve of FOG precision and the research of other SLD light resources