Closed-Loop Bias Control of Optical Quadrature Modulator

Author

Cho, Pak S. ; Khurgin, Jacob B. ; Shpantzer, Isaac

Author_Institution

CeLight, Inc, Silver Spring, MD

Volume

18

Issue

21

fYear

2006

Firstpage

2209

Lastpage

2211

Abstract

We describe a relatively simple but effective closed-loop bias control of LiNbO₃ quadrature modulator (QM) for optical quaternary phase-shift-keyed (QPSK) transmission. Simulation and experimental results of the feedback control loop for maintaining near optimal operating points of the QM are described for 12.5-GSym/s optical QPSK. The control loop uses nonhigh-speed off-the-shelf components independent of the symbol rate. Similar performance of the control loop at higher symbol rates using the same components is expected

Keywords

closed loop systems; integrated optics; lithium compounds; optical communication equipment; optical fibre communication; optical modulation; quadrature phase shift keying; LiNbO₃; LiNbO₃ modulator; closed-loop bias control; feedback control loop; nonhigh-speed components; off-the-shelf components; optical quadrature modulator; optical quaternary phase-shift keying; quadrature modulator; quaternary phase-shift-keyed transmission; Optical control; Optical feedback; Optical interferometry; Optical modulation; Optical signal processing; Phase modulation; Phase shift keying; Quadrature phase shift keying; Signal generators; Voltage; Coherent communications; integrated optics devices; phase modulation;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2006.884759

Filename

1707811