Abstract
Electron cyclotron resonance heating (ECRH) is an important auxiliary heating method which is widely used in magnetic confinement fusion. For the ECRH system on J-TEXT, signals should be transmitted to the control system for monitoring and protection and also to the data acquisition system. Considering the high-voltage and harsh electromagnetic interference environment, reliable fiber-optic transmission links are applied. Transmitted by fiber-optic modules, the response time of digital signals can be less than $1~\mu \text{s}$ . According to the ECRH system requirements, two practical analog fiber-optic transmission links based on the voltage-to-frequency and frequency-to-voltage conversion technology have been designed and developed. With IC AD650, the delay time of most analog signals is less than $100~\mu \text{s}$ , and with IC VFC110, critical signal transmission delay can be shortened to $5~\mu \text{s}$ . The test results indicate that the designed signal transmission links for ECRH system on J-TEXT are stable and reliable.
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