Abstract:
High-speed pulse signal transmission for Inertial Confinement Fusion (ICF) diagnostic experiments faces great challenges in target chambers with intense radiation and strong electromagnetic interference (EMI). Conventional coaxial cable transmission suffers from severe waveform distortion, limited transmission distance and poor environmental adaptability.
Purpose To solve these engineering bottlenecks, an electro-optic transmission system based on lithium niobate (LiNbO3) Mach-Zehnder Modulator (MZM) is developed for high-fidelity and long-distance transmission of ultrafast diagnostic signals in large-scale laser facilities.
Methods A mathematical model of electro-optic conversion is established. An engineering-oriented bias voltage stabilization strategy is adopted to suppress signal distortion caused by MZM operating point drift, which guarantees linear and high-fidelity signal transmission. System performance is verified via laboratory offline tests and on-site experiments on a large-scale laser facility.
Results Offline tests show that pulses ranging from 80 ps to several nanoseconds can be stably transmitted over 100 m optical fiber, with a waveform restoration correlation coefficient up to 0.95. On-site tests further prove that 50 m optical fiber transmission achieves better signal quality than 50 m coaxial cable. Compared with traditional cables, the proposed system features wider bandwidth, lower transmission loss, compact integration, excellent radiation resistance and electromagnetic interference immunity.
Conclusions This system fully meets the requirements for reliable transmission of ultrafast diagnostic signals in large-scale laser facilities and adapts well to the complex and harsh operating environment of ICF target chambers. Future work will focus on long-term radiation stability tests and further engineering optimization to enhance practical performance.
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