Optical Wireless Links For Intra-Satellite Communications:Link Budget Analysis And Research On Transceiver Module

Optical wireless links for intra-satellite communications (OWLS) based on Infrared as the communication media, can achieve data and command transmission among the payloads. Compared with the traditional wired transmission and RF communication, OWLS becomes a intensive topic of research worldwide with the merits of anti-electro-magnetic Interference/Compatibility (EMI/EMC), mass reduction, low power consumption, flexibility, and simplification of the assembly, integration and tests phases (AIT). The main target of OWLS is to develop fully operative optical wireless system for wide use inside future space platform, including the rad-hard components, link budget, transceiver module. This paper studies two parts transmission: link budget and Infrad transceiver module.Firstly, the network structure of the OWLS is presented. Based on OCDMA technology and CAN (Controller Area Network), SPI(Serial Peripheral Interface) bus, we designed optical system structure, including the space applicability of optoelectronic components and the link budget. The radiation effect on photoelectronic components and characteristics of photoelectronic components based on Commercial Off-The-Shelf (COTS) was also analyzed. For the link budget analysis, this paper used the Tracepro software which employ Moute-Carlo method to study the impluse response of the scatter channel for different material. We also analyzed the inter-symbol interference caused by multipath scattering, and studied the optical power penalty for the specific bit error rate in baseband OOK communication system.Secondly, in order to achieve resist radiation, low power consumption and miniaturization, analyzing coding modulation technology, the preamplifier circuit and noise mechanism, we developed IR transceiver module. It was applied in OCDMA communication network and conversion interface technology based on CAN and SPI bus, proving that its general characteristics in different coding modulation and bus agreement, saving the research costs and reducing development cycle. Finally, the optical communication system for space application is evaluated, and the testing methods of the system are proposed.In the end, the work of research is summarized, and further activities are discussed.