Abstract
Pointing, acquisition and tracking of a free-space optical node in a
mobile network experiencing misalignment due to adverse factors including
vibration, motion and atmospheric turbulence requires a different approach
than traditional free-space optical transceivers. A recent fiber-bundle approach
for beam steering at the transmitter was investigated to provide continuous
beam coverage at the receiver without the application of mechanical devices.
Utilizing multiple fibers-lenses sets at the receiver was also proposed to
enhance the tolerance of optical link misalignment. This paper investigates
the feasibility of applying multiple fibers with a single lens at the transmitter
and multiple fiber-lenses sets at the receiver to improve the transmission
performance on tolerating link misalignment. Two series of laboratorial experiments
were implemented to compare the optical link robustness for different transceiver
setups as the fiber-lens distance $({\rm
z}_{\rm fl})$ was varied to modify the beam divergence: multi-fiber
transmitter working with single-fiber-lens receiver and multi-fiber transmitter
working with multi-fiber-lens receiver. The results showed that using multiple
fibers in both the transmitter and the receiver reveals significant potential
to maximize the up time of the link.
© 2011 IEEE
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