Patent ID: 9615152
Date: 2017-04-04
CPC Classifications: H04B,H04J,H04Q

Claim:
1. An optical element comprising: a polarization splitter that splits light input from an input port into a first signal and a second signal according to a plane of polarization; a polarization rotator that rotates a plane of polarization of the second signal output from the polarization splitter by 90 degrees; a first optical coupler that combines the first signal output from the polarization splitter and the second signal output from the polarization rotator and splits a resultant signal of combining the first signal and the second signal into a third signal and a fourth signal with an equal amplitude; a phase controller that controls a phase of the third signal; and a second optical coupler that combines the third signal output from the phase controller and the fourth signal output from the first optical coupler and splits a resultant signal of combining the third signal and the fourth signal into a fifth signal and a sixth signal with an equal amplitude, wherein the phase controller controls the phase of the third signal according to a polarization state of the light input from the input port.