Patent ID: 6483621
Filing Date: 2002-11-19
Classification: H04B

Abstract:
A method, comprising:modulating a light signal with a data signal; modulating the light signal with a tracking signal having a modulation depth substantially smaller than a peak-to-peak amplitude of the light signal; transmitting and receiving the light signal modulated by the data signal and by the tracking signal; splitting the received light signal into first and second portions and directing the first portion to an optical detector and the second portion to a communication detector; recovering the tracking signal from the modulated light signal received at the optical detector and using the tracking signal to determine an orientation of a receiver component with respect to the received modulated light signal; and recovering the tracking signal from the modulated light signal received at the communication detector and triggering a tracking adjustment based on that recovered tracking signal, and in addition to, another tracking adjustment triggered by the tracking signal recovered from the optical detector.