Photonic integrated circuit for multiple frequency shifting of light

Inventors:	E. Dieussaert , R. Baets , Y. Li
Title:	Photonic integrated circuit for multiple frequency shifting of light
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Abstract

According to an aspect of the present inventive concept there is provided a photonic integrated circuit, PIC, comprising a waveguide array. Each waveguide is configured to guide a light signal. All guided light signals originate from a common light beam or multiple mutually coherent light beams.Each waveguide is associated with a mutually unique modulator, providing modulation, by a modulation signal, of phase and/or amplitude of the light signal, forming a modulated light signal. The modulation signals of all modulators have a common modulation period, such that the modulated light signal comprises a plurality of sideband frequencies representing different orders of frequency shifts based on harmonics of the modulation period.A free propagation unit comprising inputs associated with the waveguides receives the modulated light signals. The modulated light signals propagate freely in two spatial dimensions through the free propagation unit and interfere to form output signals. Different outputs of the free propagation unit receive light with different peak frequency corresponding to different sideband frequencies.

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