Patent ID: 6295151
Filing Date: 2001-09-25
Classification: G02B,H04B

Abstract:
An optical transmission and receiving system, comprising:(a) an optical source emitting a laser beam;(b) an optical receiving instrument;(c) an optical filter established between that optical source and optical receiving instrument, wherein the optical receiving instrument converts a beam output from the optical filter into a light signal;(d) a rotating mechanism to change a tilt angle of the optical filter in relation to the laser beam; and(e) a tilt angle controlling instrument which controls movement of the rotating mechanism, wherein the tilt angle controlling instrument varies the tilt angle of the optical filter within a prescribed period based on the light signal output from the optical receiving instrument, andwherein the tilt angle controlling instrument includes:an oscillator which outputs a prescribed oscillation signal;a multiplier which multiplies the oscillation signal of the oscillator and the light signal received from the optical receiving instrument;a differential amplifier which compares the multiplication signal from the multiplier to a standard voltage and which amplifies the difference thereof;an adder which superimposes and outputs the amplified signal from the differential amplifier and the oscillation signal of the oscillator; anda driving circuit which generates a control signal from the addition signal of the adder and which provides the control signal to the rotating mechanism.