Performance Assessment of a QPSK Coherent Demodulator Based on Organic-Inorganic Hybrids


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.



subject category

Engineering; Optics; Telecommunications


Bastos, ARN; Shahpari, A; Carlos, LD; Lima, M; Andre, PS; Ferreira, RAS

our authors


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).

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