The free space optical communication information transmission rate is high, which is attractive for high-speed communication scenarios. Compared with the near-Earth communication link, the satellite-to-ground laser communication link has the characteristics of long link distance, cloud layer and atmospheric turbulence. Aiming at the problem that the spread of star-to-ground laser communication pulses produces inter-code crosstalk and reduces the quality of the communication system, this paper analyzes the relationship between gauss optical pulse time domain widening and intercode crosstalk, and uses adaptive filters to balance the channels. The results show that the laser pulse broadening amount increases with the decrease of the input light pulse half wide, and the use of adaptive filter can effectively reduce the influence of code-to-code crosstalk caused by pulse broadening on the communication quality.
The previous researches on signal compensation technology based on feedforward neural network (FNN) are all in underwater channel and fiber channel. In this paper, the signal compensation technology based on FNN is applied to 8Gb/s 4-PAM indoor free space optical communication (FSOC) system for the first time. Under 7% forward error correction (FEC) threshold, the FNN algorithm is compared with direct detection and traditional LMS filtering algorithm. The FNN-based method can significantly improve the receiver sensitivity and improve the performance of the communication system.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.