초록 ▼

A method and system of communicating in free space comprises a first communication terminal having a multiplexer circuit for multiplexing a plurality of analog communication signals into a single broad band frequency division multiplexed signal. A laser generates an optical carrier signal, and an el

A method and system of communicating in free space comprises a first communication terminal having a multiplexer circuit for multiplexing a plurality of analog communication signals into a single broad band frequency division multiplexed signal. A laser generates an optical carrier signal, and an electro-optic modulator produces a phase modulated optical communications signal. A pointing and tracking beacon is also generated and transmitted with the optical communications signal to a receiver unit positioned at a second communications terminal, such as a second satellite. The receiver unit receives the phase modulated optical communications signal and pointing and tracking beacon and includes a cascaded Bragg cell and liquid crystal. A communications detector detects the optical communications signal and a pointing and tracking detector detects the pointing and tracking beacon. A controller is responsive to the communications detector and generates a control signal to the receive beam steering assembly to change the index of refraction through the cascaded Bragg cell and liquid crystal.

대표청구항 ▼

[ That which is claimed is:] [1.]1. A method of communicating in free space comprising the steps of:generating a phase modulated optical communications signal;generating a pointing and tracking beacon;transmitting the phase modulated optical communications signal and pointing and tracking beacon fro

[ That which is claimed is:] [1.]1. A method of communicating in free space comprising the steps of:generating a phase modulated optical communications signal;generating a pointing and tracking beacon;transmitting the phase modulated optical communications signal and pointing and tracking beacon from a first communications terminal to a receiver unit of a second communications terminal;receiving the phase modulated optical communications signal and pointing and tracking beacon within a cascaded Bragg cell and liquid crystal at a second communications terminal; andchanging the index of refraction based on the pointing and tracking beacon.