Title :
Feasibility study of coherent LEO-ground link system using an optical injection phase lock loop technique
Author :
Shoji, Yozo ; Takayama, Yoshihisa ; Toyoshima, Morio ; Fice, Martyn J. ; Seeds, Alwyn J.
Author_Institution :
Space Commun. Syst. Lab., NICT, Koganei, Japan
Abstract :
The feasibility of an optical injection phase lock loop technique for use in a coherent laser communications link between a LEO (Low Earth Orbit Satellite) and a OGS (Optical Ground Station) is studied. The Doppler frequency shift in the LEO-OGS coherent link is estimated and the impact on the link performance is investigated. It is demonstrated experimentally that a 10 Gbps BPSK link can successfully maintain stable frequency and phase locking status under the condition that the signal laser frequency changes over 9 GHz at a frequency deviation rate up to 1 Hz, which is ample to meet the requirement for the LEO-OGS coherent link.
Keywords :
optical links; phase locked loops; satellite communication; Doppler frequency shift; LEO-OGS coherent link; Low Earth Orbit Satellite; coherent LEO-ground link system; coherent laser communications link; optical ground station; optical injection phase lock loop technique; Doppler effect; Downlink; Low earth orbit satellites; Optical receivers; Semiconductor lasers; Time frequency analysis; LEO; coherent; downlink; injection lock; laser; phase lock loop; satellite;
Conference_Titel :
Space Optical Systems and Applications (ICSOS), 2011 International Conference on
Conference_Location :
Santa Monica, CA
Print_ISBN :
978-1-4244-9686-0
DOI :
10.1109/ICSOS.2011.5783690
