Patent ID: 6915082

Claim:
An optical data transmitting system comprising: a carrier source for linearly polarized optical wave light having a first optical axis and represented by a first vector (P 0 ) lying on said first optical axis; modulator means for allowing incident of said linearly polarized optical wave light to fall obliquely at 45 degrees with respect to said first optical axis thereof to resolve said first vector (P 0 ) into a first vector component (P 0 p), lying on a second optical axis angled in one rotational direction through 45 degrees from said first optical axis and to resolve said first vector (P 0 ) into a second vector component (P 0 s) lying on a third optical axis angled in the other rotational direction through 45 degrees from said first optical axis; said modulator means being operative in response to a first driving signal to phase modulate said first vector component to provide a phase modulated first vector component; said modulator means being operative in response to a second driving signal to phase modulate said second vector component to provide a phase modulated second vector component; and means for providing said first and second driving signals in response to a two-level digital signal; wherein said first and second driving signal providing means generates said first driving signal when said two-level signal remains in one signal level over two consecutive bit intervals, and generates said second driving signal when said two-level digital signal remains in the other signal level over two consecutive bit intervals.