A twice synchronous range GEO to GEO optical intersatellite link

The authors examine a second-generation laser communications crosslink terminal conceptual design which reflects recent developments and the much increased maturity of the hardware. The second-generation terminals are much smaller and lighter than those of the first-generation laser crosslink subsystem, and, as a consequence, multiple terminals may be used with no increase in weight or power to provide the desired connectivity (and redundancy). The terminals are assumed to operate at a data rate of 12 Mb/s over a two synch range of up to 84000 km. Multiple terminals are shown to have minimal size and weight impact on the satellite. The total suite weight and power are developed and discussed. The communication channel, link acquisition, and cooperative tracking of optical energy are discussed. Major hardware components are identified, and the technology risk associated with development of the system is considered based on the level of hardware maturity