Title :
Closed-Loop Bias Control of Optical Quadrature Modulator
Author :
Cho, Pak S. ; Khurgin, Jacob B. ; Shpantzer, Isaac
Author_Institution :
CeLight, Inc, Silver Spring, MD
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;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2006.884759
