abstract
Coherent optical systems offer enhanced possibilities to increase data transmission capacity. To implement these systems, optical demodulators are required to decode the data. In this context, optical demodulators for a Quadrature Phase Shift Keying (QPSK) modulation based on 90 degrees hybrid couplers are presented. The devices were produced by direct UV-laser patterning on sol-gel derived organic-inorganic hybrids, and the input-output ports transfer function revealed the dependence of the optical signal phase. Therefore, QPSK symbols were decoded, and the associated constellation diagram was analysed in real-time. To assess the device performance the error vector magnitude and phase deviations were obtained (5% and 1 degrees, respectively) making the produced device a promising choice to replace current QPSK receivers.
keywords
WAVE-GUIDE COUPLERS; FABRICATION; NETWORKS
subject category
Engineering; Optics; Telecommunications
authors
Bastos, ARN; Shahpari, A; Carlos, LD; Lima, M; Andre, PS; Ferreira, RAS
our authors
Ana Rita da Naia Bastos
Researcher
Luís Carlos
Full professor
Maria Rute de Amorim e Sá Ferreira André
Full professoracknowledgements
This work was developed within the scope of the project CICECO-Aveiro Institute of Materials, POCI-01-0145-FEDER-007679 (FCT Ref. UID /CTM /50011/2013), financed by national funds through the FCT/MEC and when appropriate co-financed by FEDER under the PT2020 Partnership Agreement, and Instituto de Telecomunicacoes (UID/EEA/50008/2013). A.R.N. Bastos acknowledges FCT for the grant PD/BD/105859/2014 (MAP-TELE), and Fundacao Calouste Gulbenkian for the "Premio de Estimulo a Investigacao 2015. (Proco 141767).