Patent ID: 8948546
Filing Date: 2015-02-03
Classification: G02F,H04B

Abstract:
1. An optical frequency shifter comprising: one input optical port; a 1-input, 2-output optical coupler optically connected to the one input port; two Mach-Zehnder modulation units individually optically connected to the two outputs of the 1-input, 2-output optical coupler; a 2-input, 2-output optical coupler optically connected to the individual outputs of the two Mach-Zehnder modulation units; and two output optical ports optically connected to the two outputs of the 2-input, 2-output optical coupler; wherein the two Mach-Zehnder modulation units are driven by periodic waveforms at the same frequency whose phases differ from each other by (2p+1) π/2 (p: integer).