公开(公告)号：US10951321B2

公开(公告)日：2021-03-16

申请号：US16092158

申请日：2017-05-02

Applicant: Xieon Networks S.a.r.l.

Inventor： Ulrich Gaubatz

IPC: H04B10/548 ,  H04B10/50 ,  G02F1/01 ,  G02B6/27 ,  G02B6/28 ,  H04B10/60 ,  H04B10/40

Abstract: A phase modulation device is provided that comprises a retardation device and a control device. The retardation device is characterized by first and second polarization eigenstates SOPf and SOPs. Light polarized according to the second polarization eigenstate SOPs acquires, upon passing through said retardation device, a delay with regard to light polarized according to the first polarization eigenstate SOPf, which delay corresponds to λ/2±30%, preferably λ/2±20% and most preferably λ/2±10%. The retardation device is arranged to receive input light having a polarization state SOPf; that defines an angle with respect to one of the first and second polarization eigenstates SOPf, SOPs within a predetermined angle range and to emit output light. The control device is configured to control at least one of a change of the angle between the polarization state SOPi; of
the input light and the respective polarization eigenstate SOPf, SOPs by less than 0.1*π, preferably less than 0.05*π and most preferably less than 0.02*π; and a change of the amount of said delay upon passing through said retardation device by less than 0.3*λ, preferably less than 0.2*λ and most preferably less than 0.1*λ, such that a phase shift of π±30%, preferably π±20% and most preferably π±10% on the output light is obtained.