公开(公告)号：US09823540B2

公开(公告)日：2017-11-21

申请号：US14777853

申请日：2014-03-03

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

Inventor： Erich Gottwald ,  Harald Rohde

IPC: H04B10/00 ,  G02F1/225 ,  H04B10/50 ,  H04B10/079 ,  H04B10/548 ,  H04L5/00 ,  G02F1/21

CPC classification number: G02F1/2255 ,  G02F2001/212 ,  H04B10/07955 ,  H04B10/50577 ,  H04B10/548 ,  H04L5/0048

Abstract: An optical IQ modulator (IQM) including two parallel Mach-Zehnder modulators (MZM1, MZM2) generates single sideband data signals. A control unit (18) generates additional optical single sideband pilot signals (PS1, PS2) positioned in a lower and a higher sideband respectively, and also further pilot signals (PS3, PS4) in both sidebands. A IQ modulator output signal (MOS) converted into electrical monitoring signals (MOS) and monitored. A control unit (18) selects control signals (CS12, CS3, CS4) and controls the IQ modulator via its bias ports (6, 7, 8) till the power transfer functions (PTF) of the Mach-Zehnder modulators (MZM1, MZM2) and the phase difference (ΔΦ) between their output signals is optimized.